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EFI updates for v6.2: 

- Refactor the zboot code so that it incorporates all the EFI stub
   logic, rather than calling the decompressed kernel as a EFI app.
 - Add support for initrd= command line option to x86 mixed mode.
 - Allow initrd= to be used with arbitrary EFI accessible file systems
   instead of just the one the kernel itself was loaded from.
 - Move some x86-only handling and manipulation of the EFI memory map
   into arch/x86, as it is not used anywhere else.
 - More flexible handling of any random seeds provided by the boot
   environment (i.e., systemd-boot) so that it becomes available much
   earlier during the boot.
 - Allow improved arch-agnostic EFI support in loaders, by setting a
   uniform baseline of supported features, and adding a generic magic
   number to the DOS/PE header. This should allow loaders such as GRUB or
   systemd-boot to reduce the amount of arch-specific handling
   substantially.
 - (arm64) Run EFI runtime services from a dedicated stack, and use it to
   recover from synchronous exceptions that might occur in the firmware
   code.
 - (arm64) Ensure that we don't allocate memory outside of the 48-bit
   addressable physical range.
 - Make EFI pstore record size configurable
 - Add support for decoding CXL specific CPER records
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Merge tag 'efi-next-for-v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

Pull EFI updates from Ard Biesheuvel:
 "Another fairly sizable pull request, by EFI subsystem standards.

  Most of the work was done by me, some of it in collaboration with the
  distro and bootloader folks (GRUB, systemd-boot), where the main focus
  has been on removing pointless per-arch differences in the way EFI
  boots a Linux kernel.

   - Refactor the zboot code so that it incorporates all the EFI stub
     logic, rather than calling the decompressed kernel as a EFI app.

   - Add support for initrd= command line option to x86 mixed mode.

   - Allow initrd= to be used with arbitrary EFI accessible file systems
     instead of just the one the kernel itself was loaded from.

   - Move some x86-only handling and manipulation of the EFI memory map
     into arch/x86, as it is not used anywhere else.

   - More flexible handling of any random seeds provided by the boot
     environment (i.e., systemd-boot) so that it becomes available much
     earlier during the boot.

   - Allow improved arch-agnostic EFI support in loaders, by setting a
     uniform baseline of supported features, and adding a generic magic
     number to the DOS/PE header. This should allow loaders such as GRUB
     or systemd-boot to reduce the amount of arch-specific handling
     substantially.

   - (arm64) Run EFI runtime services from a dedicated stack, and use it
     to recover from synchronous exceptions that might occur in the
     firmware code.

   - (arm64) Ensure that we don't allocate memory outside of the 48-bit
     addressable physical range.

   - Make EFI pstore record size configurable

   - Add support for decoding CXL specific CPER records"

* tag 'efi-next-for-v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: (43 commits)
  arm64: efi: Recover from synchronous exceptions occurring in firmware
  arm64: efi: Execute runtime services from a dedicated stack
  arm64: efi: Limit allocations to 48-bit addressable physical region
  efi: Put Linux specific magic number in the DOS header
  efi: libstub: Always enable initrd command line loader and bump version
  efi: stub: use random seed from EFI variable
  efi: vars: prohibit reading random seed variables
  efi: random: combine bootloader provided RNG seed with RNG protocol output
  efi/cper, cxl: Decode CXL Error Log
  efi/cper, cxl: Decode CXL Protocol Error Section
  efi: libstub: fix efi_load_initrd_dev_path() kernel-doc comment
  efi: x86: Move EFI runtime map sysfs code to arch/x86
  efi: runtime-maps: Clarify purpose and enable by default for kexec
  efi: pstore: Add module parameter for setting the record size
  efi: xen: Set EFI_PARAVIRT for Xen dom0 boot on all architectures
  efi: memmap: Move manipulation routines into x86 arch tree
  efi: memmap: Move EFI fake memmap support into x86 arch tree
  efi: libstub: Undeprecate the command line initrd loader
  efi: libstub: Add mixed mode support to command line initrd loader
  efi: libstub: Permit mixed mode return types other than efi_status_t
  ...
This commit is contained in:
Linus Torvalds 2022-12-13 14:31:47 -08:00
parent 717e6eb49b e8dfdf3162
commit fc4c9f4504
69 changed files with 2141 additions and 1495 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
MAINTAINERS
View File

@ -7839,7 +7839,6 @@ F: Documentation/admin-guide/efi-stub.rst
F: arch/*/include/asm/efi.h
F: arch/*/kernel/efi.c
F: arch/arm/boot/compressed/efi-header.S
F: arch/arm64/kernel/efi-entry.S
F: arch/x86/platform/efi/
F: drivers/firmware/efi/
F: include/linux/efi*.h

3
arch/arm/include/asm/efi.h
View File

@ -43,9 +43,6 @@ void efi_virtmap_unload(void);
/* arch specific definitions used by the stub code */
struct screen_info *alloc_screen_info(void);
void free_screen_info(struct screen_info *si);
/*
* A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
* so we will reserve that amount of memory. We have no easy way to tell what

31
arch/arm/kernel/efi.c
View File

@ -75,38 +75,13 @@ int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
return 0;
}
static unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
static unsigned long __initdata cpu_state_table = EFI_INVALID_TABLE_ADDR;
const efi_config_table_type_t efi_arch_tables[] __initconst = {
{LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table},
{LINUX_EFI_ARM_CPU_STATE_TABLE_GUID, &cpu_state_table},
{}
};
static void __init load_screen_info_table(void)
{
struct screen_info *si;
if (screen_info_table != EFI_INVALID_TABLE_ADDR) {
si = early_memremap_ro(screen_info_table, sizeof(*si));
if (!si) {
pr_err("Could not map screen_info config table\n");
return;
}
screen_info = *si;
early_memunmap(si, sizeof(*si));
/* dummycon on ARM needs non-zero values for columns/lines */
screen_info.orig_video_cols = 80;
screen_info.orig_video_lines = 25;
if (memblock_is_map_memory(screen_info.lfb_base))
memblock_mark_nomap(screen_info.lfb_base,
screen_info.lfb_size);
}
}
static void __init load_cpu_state_table(void)
{
if (cpu_state_table != EFI_INVALID_TABLE_ADDR) {
@ -145,7 +120,11 @@ void __init arm_efi_init(void)
{
efi_init();
load_screen_info_table();
if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI) {
/* dummycon on ARM needs non-zero values for columns/lines */
screen_info.orig_video_cols = 80;
screen_info.orig_video_lines = 25;
}
/* ARM does not permit early mappings to persist across paging_init() */
efi_memmap_unmap();

27
arch/arm64/include/asm/efi.h
View File

@ -14,8 +14,16 @@
#ifdef CONFIG_EFI
extern void efi_init(void);
bool efi_runtime_fixup_exception(struct pt_regs *regs, const char *msg);
#else
#define efi_init()
static inline
bool efi_runtime_fixup_exception(struct pt_regs *regs, const char *msg)
{
return false;
}
#endif
int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
@ -25,6 +33,7 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
({ \
efi_virtmap_load(); \
__efi_fpsimd_begin(); \
spin_lock(&efi_rt_lock); \
})
#undef arch_efi_call_virt
@ -33,10 +42,12 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
#define arch_efi_call_virt_teardown() \
({ \
spin_unlock(&efi_rt_lock); \
__efi_fpsimd_end(); \
efi_virtmap_unload(); \
})
extern spinlock_t efi_rt_lock;
efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...);
#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
@ -76,13 +87,23 @@ static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS_MIN - 1));
}
#define alloc_screen_info(x...) &screen_info
static inline void free_screen_info(struct screen_info *si)
static inline unsigned long efi_get_kimg_min_align(void)
{
extern bool efi_nokaslr;
/*
* Although relocatable kernels can fix up the misalignment with
* respect to MIN_KIMG_ALIGN, the resulting virtual text addresses are
* subtly out of sync with those recorded in the vmlinux when kaslr is
* disabled but the image required relocation anyway. Therefore retain
* 2M alignment if KASLR was explicitly disabled, even if it was not
* going to be activated to begin with.
*/
return efi_nokaslr ? MIN_KIMG_ALIGN : EFI_KIMG_ALIGN;
}
#define EFI_ALLOC_ALIGN SZ_64K
#define EFI_ALLOC_LIMIT ((1UL << 48) - 1)
/*
* On ARM systems, virtually remapped UEFI runtime services are set up in two

9
arch/arm64/kernel/Makefile
View File

@ -36,12 +36,6 @@ obj-y := debug-monitors.o entry.o irq.o fpsimd.o \
syscall.o proton-pack.o idreg-override.o idle.o \
patching.o
targets += efi-entry.o
OBJCOPYFLAGS := --prefix-symbols=__efistub_
$(obj)/%.stub.o: $(obj)/%.o FORCE
$(call if_changed,objcopy)
obj-$(CONFIG_COMPAT) += sys32.o signal32.o \
sys_compat.o
obj-$(CONFIG_COMPAT) += sigreturn32.o
@ -57,8 +51,7 @@ obj-$(CONFIG_CPU_PM) += sleep.o suspend.o
obj-$(CONFIG_CPU_IDLE) += cpuidle.o
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_EFI) += efi.o efi-entry.stub.o \
efi-rt-wrapper.o
obj-$(CONFIG_EFI) += efi.o efi-rt-wrapper.o
obj-$(CONFIG_PCI) += pci.o
obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
obj-$(CONFIG_ACPI) += acpi.o

69
arch/arm64/kernel/efi-entry.S
View File

@ -1,69 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* EFI entry point.
*
* Copyright (C) 2013, 2014 Red Hat, Inc.
* Author: Mark Salter <msalter@redhat.com>
*/
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
__INIT
SYM_CODE_START(efi_enter_kernel)
/*
* efi_pe_entry() will have copied the kernel image if necessary and we
* end up here with device tree address in x1 and the kernel entry
* point stored in x0. Save those values in registers which are
* callee preserved.
*/
ldr w2, =primary_entry_offset
add x19, x0, x2 // relocated Image entrypoint
mov x20, x1 // DTB address
/*
* Clean the copied Image to the PoC, and ensure it is not shadowed by
* stale icache entries from before relocation.
*/
ldr w1, =kernel_size
add x1, x0, x1
bl dcache_clean_poc
ic ialluis
/*
* Clean the remainder of this routine to the PoC
* so that we can safely disable the MMU and caches.
*/
adr x0, 0f
adr x1, 3f
bl dcache_clean_poc
0:
/* Turn off Dcache and MMU */
mrs x0, CurrentEL
cmp x0, #CurrentEL_EL2
b.ne 1f
mrs x0, sctlr_el2
bic x0, x0, #1 << 0 // clear SCTLR.M
bic x0, x0, #1 << 2 // clear SCTLR.C
pre_disable_mmu_workaround
msr sctlr_el2, x0
isb
b 2f
1:
mrs x0, sctlr_el1
bic x0, x0, #1 << 0 // clear SCTLR.M
bic x0, x0, #1 << 2 // clear SCTLR.C
pre_disable_mmu_workaround
msr sctlr_el1, x0
isb
2:
/* Jump to kernel entry point */
mov x0, x20
mov x1, xzr
mov x2, xzr
mov x3, xzr
br x19
3:
SYM_CODE_END(efi_enter_kernel)

39
arch/arm64/kernel/efi-rt-wrapper.S
View File

@ -6,7 +6,7 @@
#include <linux/linkage.h>
SYM_FUNC_START(__efi_rt_asm_wrapper)
stp x29, x30, [sp, #-32]!
stp x29, x30, [sp, #-112]!
mov x29, sp
/*
@ -16,6 +16,22 @@ SYM_FUNC_START(__efi_rt_asm_wrapper)
*/
stp x1, x18, [sp, #16]
/*
* Preserve all callee saved registers and preserve the stack pointer
* value at the base of the EFI runtime stack so we can recover from
* synchronous exceptions occurring while executing the firmware
* routines.
*/
stp x19, x20, [sp, #32]
stp x21, x22, [sp, #48]
stp x23, x24, [sp, #64]
stp x25, x26, [sp, #80]
stp x27, x28, [sp, #96]
ldr_l x16, efi_rt_stack_top
mov sp, x16
stp x18, x29, [sp, #-16]!
/*
* We are lucky enough that no EFI runtime services take more than
* 5 arguments, so all are passed in registers rather than via the
@ -29,9 +45,10 @@ SYM_FUNC_START(__efi_rt_asm_wrapper)
mov x4, x6
blr x8
mov sp, x29
ldp x1, x2, [sp, #16]
cmp x2, x18
ldp x29, x30, [sp], #32
ldp x29, x30, [sp], #112
b.ne 0f
ret
0:
@ -42,6 +59,22 @@ SYM_FUNC_START(__efi_rt_asm_wrapper)
* called with preemption disabled and a separate shadow stack is used
* for interrupts.
*/
mov x18, x2
#ifdef CONFIG_SHADOW_CALL_STACK
ldr_l x18, efi_rt_stack_top
ldr x18, [x18, #-16]
#endif
b efi_handle_corrupted_x18 // tail call
SYM_FUNC_END(__efi_rt_asm_wrapper)
SYM_CODE_START(__efi_rt_asm_recover)
mov sp, x30
ldp x19, x20, [sp, #32]
ldp x21, x22, [sp, #48]
ldp x23, x24, [sp, #64]
ldp x25, x26, [sp, #80]
ldp x27, x28, [sp, #96]
ldp x29, x30, [sp], #112
ret
SYM_CODE_END(__efi_rt_asm_recover)

49
arch/arm64/kernel/efi.c
View File

@ -144,3 +144,52 @@ asmlinkage efi_status_t efi_handle_corrupted_x18(efi_status_t s, const char *f)
pr_err_ratelimited(FW_BUG "register x18 corrupted by EFI %s\n", f);
return s;
}
DEFINE_SPINLOCK(efi_rt_lock);
asmlinkage u64 *efi_rt_stack_top __ro_after_init;
asmlinkage efi_status_t __efi_rt_asm_recover(void);
bool efi_runtime_fixup_exception(struct pt_regs *regs, const char *msg)
{
/* Check whether the exception occurred while running the firmware */
if (current_work() != &efi_rts_work.work || regs->pc >= TASK_SIZE_64)
return false;
pr_err(FW_BUG "Unable to handle %s in EFI runtime service\n", msg);
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
regs->regs[0] = EFI_ABORTED;
regs->regs[30] = efi_rt_stack_top[-1];
regs->pc = (u64)__efi_rt_asm_recover;
if (IS_ENABLED(CONFIG_SHADOW_CALL_STACK))
regs->regs[18] = efi_rt_stack_top[-2];
return true;
}
/* EFI requires 8 KiB of stack space for runtime services */
static_assert(THREAD_SIZE >= SZ_8K);
static int __init arm64_efi_rt_init(void)
{
void *p;
if (!efi_enabled(EFI_RUNTIME_SERVICES))
return 0;
p = __vmalloc_node(THREAD_SIZE, THREAD_ALIGN, GFP_KERNEL,
NUMA_NO_NODE, &&l);
l: if (!p) {
pr_warn("Failed to allocate EFI runtime stack\n");
clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
return -ENOMEM;
}
efi_rt_stack_top = p + THREAD_SIZE;
return 0;
}
core_initcall(arm64_efi_rt_init);

8
arch/arm64/kernel/image-vars.h
View File

@ -10,7 +10,6 @@
#error This file should only be included in vmlinux.lds.S
#endif
PROVIDE(__efistub_kernel_size = _edata - _text);
PROVIDE(__efistub_primary_entry_offset = primary_entry - _text);
/*
@ -22,13 +21,6 @@ PROVIDE(__efistub_primary_entry_offset = primary_entry - _text);
* linked at. The routines below are all implemented in assembler in a
* position independent manner
*/
PROVIDE(__efistub_memcmp = __pi_memcmp);
PROVIDE(__efistub_memchr = __pi_memchr);
PROVIDE(__efistub_strlen = __pi_strlen);
PROVIDE(__efistub_strnlen = __pi_strnlen);
PROVIDE(__efistub_strcmp = __pi_strcmp);
PROVIDE(__efistub_strncmp = __pi_strncmp);
PROVIDE(__efistub_strrchr = __pi_strrchr);
PROVIDE(__efistub_dcache_clean_poc = __pi_dcache_clean_poc);
PROVIDE(__efistub__text = _text);

4
arch/arm64/mm/fault.c
View File

@ -30,6 +30,7 @@
#include <asm/bug.h>
#include <asm/cmpxchg.h>
#include <asm/cpufeature.h>
#include <asm/efi.h>
#include <asm/exception.h>
#include <asm/daifflags.h>
#include <asm/debug-monitors.h>
@ -397,6 +398,9 @@ static void __do_kernel_fault(unsigned long addr, unsigned long esr,
msg = "paging request";
}
if (efi_runtime_fixup_exception(regs, msg))
return;
die_kernel_fault(msg, addr, esr, regs);
}

18
arch/loongarch/include/asm/efi.h
View File

@ -19,18 +19,18 @@ void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
#define EFI_ALLOC_ALIGN SZ_64K
#define EFI_RT_VIRTUAL_OFFSET CSR_DMW0_BASE
static inline struct screen_info *alloc_screen_info(void)
{
return &screen_info;
}
static inline void free_screen_info(struct screen_info *si)
{
}
static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
{
return ULONG_MAX;
}
static inline unsigned long efi_get_kimg_min_align(void)
{
return SZ_2M;
}
#define EFI_KIMG_PREFERRED_ADDRESS PHYSADDR(VMLINUX_LOAD_ADDRESS)
unsigned long kernel_entry_address(void);
#endif /* _ASM_LOONGARCH_EFI_H */

24
arch/loongarch/kernel/efi.c
View File

@ -52,6 +52,27 @@ void __init efi_runtime_init(void)
set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
}
unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
static void __init init_screen_info(void)
{
struct screen_info *si;
if (screen_info_table == EFI_INVALID_TABLE_ADDR)
return;
si = early_memremap(screen_info_table, sizeof(*si));
if (!si) {
pr_err("Could not map screen_info config table\n");
return;
}
screen_info = *si;
memset(si, 0, sizeof(*si));
early_memunmap(si, sizeof(*si));
memblock_reserve(screen_info.lfb_base, screen_info.lfb_size);
}
void __init efi_init(void)
{
int size;
@ -80,8 +101,7 @@ void __init efi_init(void)
set_bit(EFI_CONFIG_TABLES, &efi.flags);
if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI)
memblock_reserve(screen_info.lfb_base, screen_info.lfb_size);
init_screen_info();
if (boot_memmap == EFI_INVALID_TABLE_ADDR)
return;

3
arch/loongarch/kernel/head.S
View File

@ -25,7 +25,8 @@ _head:
.dword kernel_entry /* Kernel entry point */
.dword _end - _text /* Kernel image effective size */
.quad 0 /* Kernel image load offset from start of RAM */
.org 0x3c /* 0x20 ~ 0x3b reserved */
.org 0x38 /* 0x20 ~ 0x37 reserved */
.long LINUX_PE_MAGIC
.long pe_header - _head /* Offset to the PE header */
pe_header:

8
arch/loongarch/kernel/image-vars.h
View File

@ -7,15 +7,7 @@
#ifdef CONFIG_EFI_STUB
__efistub_memcmp = memcmp;
__efistub_memchr = memchr;
__efistub_strcat = strcat;
__efistub_strcmp = strcmp;
__efistub_strlen = strlen;
__efistub_strncat = strncat;
__efistub_strnstr = strnstr;
__efistub_strnlen = strnlen;
__efistub_strrchr = strrchr;
__efistub_kernel_entry = kernel_entry;
__efistub_kernel_asize = kernel_asize;
__efistub_kernel_fsize = kernel_fsize;

13
arch/riscv/include/asm/efi.h
View File

@ -35,13 +35,20 @@ static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
return ULONG_MAX;
}
#define alloc_screen_info(x...) (&screen_info)
static inline void free_screen_info(struct screen_info *si)
static inline unsigned long efi_get_kimg_min_align(void)
{
/*
* RISC-V requires the kernel image to placed 2 MB aligned base for 64
* bit and 4MB for 32 bit.
*/
return IS_ENABLED(CONFIG_64BIT) ? SZ_2M : SZ_4M;
}
#define EFI_KIMG_PREFERRED_ADDRESS efi_get_kimg_min_align()
void efi_virtmap_load(void);
void efi_virtmap_unload(void);
unsigned long stext_offset(void);
#endif /* _ASM_EFI_H */

6
arch/riscv/kernel/image-vars.h
View File

@ -23,13 +23,7 @@
* linked at. The routines below are all implemented in assembler in a
* position independent manner
*/
__efistub_memcmp = memcmp;
__efistub_memchr = memchr;
__efistub_strlen = strlen;
__efistub_strnlen = strnlen;
__efistub_strcmp = strcmp;
__efistub_strncmp = strncmp;
__efistub_strrchr = strrchr;
__efistub__start = _start;
__efistub__start_kernel = _start_kernel;

31
arch/x86/Kconfig
View File

@ -1995,6 +1995,37 @@ config EFI_MIXED
If unsure, say N.
config EFI_FAKE_MEMMAP
bool "Enable EFI fake memory map"
depends on EFI
help
Saying Y here will enable "efi_fake_mem" boot option. By specifying
this parameter, you can add arbitrary attribute to specific memory
range by updating original (firmware provided) EFI memmap. This is
useful for debugging of EFI memmap related feature, e.g., Address
Range Mirroring feature.
config EFI_MAX_FAKE_MEM
int "maximum allowable number of ranges in efi_fake_mem boot option"
depends on EFI_FAKE_MEMMAP
range 1 128
default 8
help
Maximum allowable number of ranges in efi_fake_mem boot option.
Ranges can be set up to this value using comma-separated list.
The default value is 8.
config EFI_RUNTIME_MAP
bool "Export EFI runtime maps to sysfs" if EXPERT
depends on EFI
default KEXEC_CORE
help
Export EFI runtime memory regions to /sys/firmware/efi/runtime-map.
That memory map is required by the 2nd kernel to set up EFI virtual
mappings after kexec, but can also be used for debugging purposes.
See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
source "kernel/Kconfig.hz"
config KEXEC

6
arch/x86/boot/compressed/efi_thunk_64.S
View File

@ -93,12 +93,6 @@ SYM_FUNC_START(__efi64_thunk)
movl %ebx, %fs
movl %ebx, %gs
/*
* Convert 32-bit status code into 64-bit.
*/
roll $1, %eax
rorq $1, %rax
pop %rbx
pop %rbp
RET

3
arch/x86/boot/header.S
View File

@ -80,10 +80,11 @@ bs_die:
ljmp $0xf000,$0xfff0
#ifdef CONFIG_EFI_STUB
.org 0x3c
.org 0x38
#
# Offset to the PE header.
#
.long LINUX_PE_MAGIC
.long pe_header
#endif /* CONFIG_EFI_STUB */

109
arch/x86/include/asm/efi.h
View File

@ -178,7 +178,7 @@ struct efi_setup_data {
extern u64 efi_setup;
#ifdef CONFIG_EFI
extern efi_status_t __efi64_thunk(u32, ...);
extern u64 __efi64_thunk(u32, ...);
#define efi64_thunk(...) ({ \
u64 __pad[3]; /* must have space for 3 args on the stack */ \
@ -228,16 +228,15 @@ static inline bool efi_is_native(void)
return efi_is_64bit();
}
#define efi_mixed_mode_cast(attr) \
__builtin_choose_expr( \
__builtin_types_compatible_p(u32, __typeof__(attr)), \
(unsigned long)(attr), (attr))
#define efi_table_attr(inst, attr) \
(efi_is_native() \
? inst->attr \
: (__typeof__(inst->attr)) \
efi_mixed_mode_cast(inst->mixed_mode.attr))
(efi_is_native() ? (inst)->attr \
: efi_mixed_table_attr((inst), attr))
#define efi_mixed_table_attr(inst, attr) \
(__typeof__(inst->attr)) \
_Generic(inst->mixed_mode.attr, \
u32: (unsigned long)(inst->mixed_mode.attr), \
default: (inst->mixed_mode.attr))
/*
* The following macros allow translating arguments if necessary from native to
@ -325,6 +324,17 @@ static inline u32 efi64_convert_status(efi_status_t status)
#define __efi64_argmap_set_memory_space_attributes(phys, size, flags) \
(__efi64_split(phys), __efi64_split(size), __efi64_split(flags))
/* file protocol */
#define __efi64_argmap_open(prot, newh, fname, mode, attr) \
((prot), efi64_zero_upper(newh), (fname), __efi64_split(mode), \
__efi64_split(attr))
#define __efi64_argmap_set_position(pos) (__efi64_split(pos))
/* file system protocol */
#define __efi64_argmap_open_volume(prot, file) \
((prot), efi64_zero_upper(file))
/*
* The macros below handle the plumbing for the argument mapping. To add a
* mapping for a specific EFI method, simply define a macro
@ -344,31 +354,27 @@ static inline u32 efi64_convert_status(efi_status_t status)
#define __efi_eat(...)
#define __efi_eval(...) __VA_ARGS__
/* The three macros below handle dispatching via the thunk if needed */
static inline efi_status_t __efi64_widen_efi_status(u64 status)
{
/* use rotate to move the value of bit #31 into position #63 */
return ror64(rol32(status, 1), 1);
}
#define efi_call_proto(inst, func, ...) \
(efi_is_native() \
? inst->func(inst, ##__VA_ARGS__) \
: __efi64_thunk_map(inst, func, inst, ##__VA_ARGS__))
/* The macro below handles dispatching via the thunk if needed */
#define efi_bs_call(func, ...) \
(efi_is_native() \
? efi_system_table->boottime->func(__VA_ARGS__) \
: __efi64_thunk_map(efi_table_attr(efi_system_table, \
boottime), \
func, __VA_ARGS__))
#define efi_fn_call(inst, func, ...) \
(efi_is_native() ? (inst)->func(__VA_ARGS__) \
: efi_mixed_call((inst), func, ##__VA_ARGS__))
#define efi_rt_call(func, ...) \
(efi_is_native() \
? efi_system_table->runtime->func(__VA_ARGS__) \
: __efi64_thunk_map(efi_table_attr(efi_system_table, \
runtime), \
func, __VA_ARGS__))
#define efi_dxe_call(func, ...) \
(efi_is_native() \
? efi_dxe_table->func(__VA_ARGS__) \
: __efi64_thunk_map(efi_dxe_table, func, __VA_ARGS__))
#define efi_mixed_call(inst, func, ...) \
_Generic(inst->func(__VA_ARGS__), \
efi_status_t: \
__efi64_widen_efi_status( \
__efi64_thunk_map(inst, func, ##__VA_ARGS__)), \
u64: ({ BUILD_BUG(); ULONG_MAX; }), \
default: \
(__typeof__(inst->func(__VA_ARGS__))) \
__efi64_thunk_map(inst, func, ##__VA_ARGS__))
#else /* CONFIG_EFI_MIXED */
@ -400,13 +406,52 @@ static inline void efi_reserve_boot_services(void)
#ifdef CONFIG_EFI_FAKE_MEMMAP
extern void __init efi_fake_memmap_early(void);
extern void __init efi_fake_memmap(void);
#else
static inline void efi_fake_memmap_early(void)
{
}
static inline void efi_fake_memmap(void)
{
}
#endif
extern int __init efi_memmap_alloc(unsigned int num_entries,
struct efi_memory_map_data *data);
extern void __efi_memmap_free(u64 phys, unsigned long size,
unsigned long flags);
#define __efi_memmap_free __efi_memmap_free
extern int __init efi_memmap_install(struct efi_memory_map_data *data);
extern int __init efi_memmap_split_count(efi_memory_desc_t *md,
struct range *range);
extern void __init efi_memmap_insert(struct efi_memory_map *old_memmap,
void *buf, struct efi_mem_range *mem);
#define arch_ima_efi_boot_mode \
({ extern struct boot_params boot_params; boot_params.secure_boot; })
#ifdef CONFIG_EFI_RUNTIME_MAP
int efi_get_runtime_map_size(void);
int efi_get_runtime_map_desc_size(void);
int efi_runtime_map_copy(void *buf, size_t bufsz);
#else
static inline int efi_get_runtime_map_size(void)
{
return 0;
}
static inline int efi_get_runtime_map_desc_size(void)
{
return 0;
}
static inline int efi_runtime_map_copy(void *buf, size_t bufsz)
{
return 0;
}
#endif
#endif /* _ASM_X86_EFI_H */

1
arch/x86/kernel/setup.c
View File

@ -31,6 +31,7 @@
#include <xen/xen.h>
#include <asm/apic.h>
#include <asm/efi.h>
#include <asm/numa.h>
#include <asm/bios_ebda.h>
#include <asm/bugs.h>

5
arch/x86/platform/efi/Makefile
View File

@ -2,5 +2,8 @@
KASAN_SANITIZE := n
GCOV_PROFILE := n
obj-$(CONFIG_EFI) += quirks.o efi.o efi_$(BITS).o efi_stub_$(BITS).o
obj-$(CONFIG_EFI) += memmap.o quirks.o efi.o efi_$(BITS).o \
efi_stub_$(BITS).o
obj-$(CONFIG_EFI_MIXED) += efi_thunk_$(BITS).o
obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_mem.o
obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o

2
arch/x86/platform/efi/efi.c
View File

@ -214,9 +214,11 @@ int __init efi_memblock_x86_reserve_range(void)
data.desc_size = e->efi_memdesc_size;
data.desc_version = e->efi_memdesc_version;
if (!efi_enabled(EFI_PARAVIRT)) {
rv = efi_memmap_init_early(&data);
if (rv)
return rv;
}
if (add_efi_memmap || do_efi_soft_reserve())
do_add_efi_memmap();

79
drivers/firmware/efi/fake_mem.c → arch/x86/platform/efi/fake_mem.c
View File

@ -17,10 +17,13 @@
#include <linux/memblock.h>
#include <linux/types.h>
#include <linux/sort.h>
#include "fake_mem.h"
#include <asm/e820/api.h>
#include <asm/efi.h>
struct efi_mem_range efi_fake_mems[EFI_MAX_FAKEMEM];
int nr_fake_mem;
#define EFI_MAX_FAKEMEM CONFIG_EFI_MAX_FAKE_MEM
static struct efi_mem_range efi_fake_mems[EFI_MAX_FAKEMEM];
static int nr_fake_mem;
static int __init cmp_fake_mem(const void *x1, const void *x2)
{
@ -122,3 +125,73 @@ static int __init setup_fake_mem(char *p)
}
early_param("efi_fake_mem", setup_fake_mem);
void __init efi_fake_memmap_early(void)
{
int i;
/*
* The late efi_fake_mem() call can handle all requests if
* EFI_MEMORY_SP support is disabled.
*/
if (!efi_soft_reserve_enabled())
return;
if (!efi_enabled(EFI_MEMMAP) || !nr_fake_mem)
return;
/*
* Given that efi_fake_memmap() needs to perform memblock
* allocations it needs to run after e820__memblock_setup().
* However, if efi_fake_mem specifies EFI_MEMORY_SP for a given
* address range that potentially needs to mark the memory as
* reserved prior to e820__memblock_setup(). Update e820
* directly if EFI_MEMORY_SP is specified for an
* EFI_CONVENTIONAL_MEMORY descriptor.
*/
for (i = 0; i < nr_fake_mem; i++) {
struct efi_mem_range *mem = &efi_fake_mems[i];
efi_memory_desc_t *md;
u64 m_start, m_end;
if ((mem->attribute & EFI_MEMORY_SP) == 0)
continue;
m_start = mem->range.start;
m_end = mem->range.end;
for_each_efi_memory_desc(md) {
u64 start, end, size;
if (md->type != EFI_CONVENTIONAL_MEMORY)
continue;
start = md->phys_addr;
end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
if (m_start <= end && m_end >= start)
/* fake range overlaps descriptor */;
else
continue;
/*
* Trim the boundary of the e820 update to the
* descriptor in case the fake range overlaps
* !EFI_CONVENTIONAL_MEMORY
*/
start = max(start, m_start);
end = min(end, m_end);
size = end - start + 1;
if (end <= start)
continue;
/*
* Ensure each efi_fake_mem instance results in
* a unique e820 resource
*/
e820__range_remove(start, size, E820_TYPE_RAM, 1);
e820__range_add(start, size, E820_TYPE_SOFT_RESERVED);
e820__update_table(e820_table);
}
}
}

239
arch/x86/platform/efi/memmap.c Normal file
View File

@ -0,0 +1,239 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Common EFI memory map functions.
*/
#define pr_fmt(fmt) "efi: " fmt
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/efi.h>
#include <linux/io.h>
#include <asm/early_ioremap.h>
#include <asm/efi.h>
#include <linux/memblock.h>
#include <linux/slab.h>
static phys_addr_t __init __efi_memmap_alloc_early(unsigned long size)
{
return memblock_phys_alloc(size, SMP_CACHE_BYTES);
}
static phys_addr_t __init __efi_memmap_alloc_late(unsigned long size)
{
unsigned int order = get_order(size);
struct page *p = alloc_pages(GFP_KERNEL, order);
if (!p)
return 0;
return PFN_PHYS(page_to_pfn(p));
}
void __init __efi_memmap_free(u64 phys, unsigned long size, unsigned long flags)
{
if (flags & EFI_MEMMAP_MEMBLOCK) {
if (slab_is_available())
memblock_free_late(phys, size);
else
memblock_phys_free(phys, size);
} else if (flags & EFI_MEMMAP_SLAB) {
struct page *p = pfn_to_page(PHYS_PFN(phys));
unsigned int order = get_order(size);
free_pages((unsigned long) page_address(p), order);
}
}
/**
* efi_memmap_alloc - Allocate memory for the EFI memory map
* @num_entries: Number of entries in the allocated map.
* @data: efi memmap installation parameters
*
* Depending on whether mm_init() has already been invoked or not,
* either memblock or "normal" page allocation is used.
*
* Returns zero on success, a negative error code on failure.
*/
int __init efi_memmap_alloc(unsigned int num_entries,
struct efi_memory_map_data *data)
{
/* Expect allocation parameters are zero initialized */
WARN_ON(data->phys_map || data->size);
data->size = num_entries * efi.memmap.desc_size;
data->desc_version = efi.memmap.desc_version;
data->desc_size = efi.memmap.desc_size;
data->flags &= ~(EFI_MEMMAP_SLAB | EFI_MEMMAP_MEMBLOCK);
data->flags |= efi.memmap.flags & EFI_MEMMAP_LATE;
if (slab_is_available()) {
data->flags |= EFI_MEMMAP_SLAB;
data->phys_map = __efi_memmap_alloc_late(data->size);
} else {
data->flags |= EFI_MEMMAP_MEMBLOCK;
data->phys_map = __efi_memmap_alloc_early(data->size);
}
if (!data->phys_map)
return -ENOMEM;
return 0;
}
/**
* efi_memmap_install - Install a new EFI memory map in efi.memmap
* @ctx: map allocation parameters (address, size, flags)
*
* Unlike efi_memmap_init_*(), this function does not allow the caller
* to switch from early to late mappings. It simply uses the existing
* mapping function and installs the new memmap.
*
* Returns zero on success, a negative error code on failure.
*/
int __init efi_memmap_install(struct efi_memory_map_data *data)
{
efi_memmap_unmap();
if (efi_enabled(EFI_PARAVIRT))
return 0;
return __efi_memmap_init(data);
}
/**
* efi_memmap_split_count - Count number of additional EFI memmap entries
* @md: EFI memory descriptor to split
* @range: Address range (start, end) to split around
*
* Returns the number of additional EFI memmap entries required to
* accommodate @range.
*/
int __init efi_memmap_split_count(efi_memory_desc_t *md, struct range *range)
{
u64 m_start, m_end;
u64 start, end;
int count = 0;
start = md->phys_addr;
end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1;
/* modifying range */
m_start = range->start;
m_end = range->end;
if (m_start <= start) {
/* split into 2 parts */
if (start < m_end && m_end < end)
count++;
}
if (start < m_start && m_start < end) {
/* split into 3 parts */
if (m_end < end)
count += 2;
/* split into 2 parts */
if (end <= m_end)
count++;
}
return count;
}
/**
* efi_memmap_insert - Insert a memory region in an EFI memmap
* @old_memmap: The existing EFI memory map structure
* @buf: Address of buffer to store new map
* @mem: Memory map entry to insert
*
* It is suggested that you call efi_memmap_split_count() first
* to see how large @buf needs to be.
*/
void __init efi_memmap_insert(struct efi_memory_map *old_memmap, void *buf,
struct efi_mem_range *mem)
{
u64 m_start, m_end, m_attr;
efi_memory_desc_t *md;
u64 start, end;
void *old, *new;
/* modifying range */
m_start = mem->range.start;
m_end = mem->range.end;
m_attr = mem->attribute;
/*
* The EFI memory map deals with regions in EFI_PAGE_SIZE
* units. Ensure that the region described by 'mem' is aligned
* correctly.
*/
if (!IS_ALIGNED(m_start, EFI_PAGE_SIZE) ||
!IS_ALIGNED(m_end + 1, EFI_PAGE_SIZE)) {
WARN_ON(1);
return;
}
for (old = old_memmap->map, new = buf;
old < old_memmap->map_end;
old += old_memmap->desc_size, new += old_memmap->desc_size) {
/* copy original EFI memory descriptor */
memcpy(new, old, old_memmap->desc_size);
md = new;
start = md->phys_addr;
end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
if (m_start <= start && end <= m_end)
md->attribute |= m_attr;
if (m_start <= start &&
(start < m_end && m_end < end)) {
/* first part */
md->attribute |= m_attr;
md->num_pages = (m_end - md->phys_addr + 1) >>
EFI_PAGE_SHIFT;
/* latter part */
new += old_memmap->desc_size;
memcpy(new, old, old_memmap->desc_size);
md = new;
md->phys_addr = m_end + 1;
md->num_pages = (end - md->phys_addr + 1) >>
EFI_PAGE_SHIFT;
}
if ((start < m_start && m_start < end) && m_end < end) {
/* first part */
md->num_pages = (m_start - md->phys_addr) >>
EFI_PAGE_SHIFT;
/* middle part */
new += old_memmap->desc_size;
memcpy(new, old, old_memmap->desc_size);
md = new;
md->attribute |= m_attr;
md->phys_addr = m_start;
md->num_pages = (m_end - m_start + 1) >>
EFI_PAGE_SHIFT;
/* last part */
new += old_memmap->desc_size;
memcpy(new, old, old_memmap->desc_size);
md = new;
md->phys_addr = m_end + 1;
md->num_pages = (end - m_end) >>
EFI_PAGE_SHIFT;
}
if ((start < m_start && m_start < end) &&
(end <= m_end)) {
/* first part */
md->num_pages = (m_start - md->phys_addr) >>
EFI_PAGE_SHIFT;
/* latter part */
new += old_memmap->desc_size;
memcpy(new, old, old_memmap->desc_size);
md = new;
md->phys_addr = m_start;
md->num_pages = (end - md->phys_addr + 1) >>
EFI_PAGE_SHIFT;
md->attribute |= m_attr;
}
}
}

7
drivers/firmware/efi/runtime-map.c → arch/x86/platform/efi/runtime-map.c
View File

@ -1,6 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
/*
* linux/drivers/efi/runtime-map.c
* Copyright (C) 2013 Red Hat, Inc., Dave Young <dyoung@redhat.com>
*/
@ -11,6 +10,7 @@
#include <linux/efi.h>
#include <linux/slab.h>
#include <asm/efi.h>
#include <asm/setup.h>
struct efi_runtime_map_entry {
@ -157,13 +157,13 @@ int efi_runtime_map_copy(void *buf, size_t bufsz)
return 0;
}
int __init efi_runtime_map_init(struct kobject *efi_kobj)
static int __init efi_runtime_map_init(void)
{
int i, j, ret = 0;
struct efi_runtime_map_entry *entry;
efi_memory_desc_t *md;
if (!efi_enabled(EFI_MEMMAP))
if (!efi_enabled(EFI_MEMMAP) || !efi_kobj)
return 0;
map_entries = kcalloc(efi.memmap.nr_map, sizeof(entry), GFP_KERNEL);
@ -191,3 +191,4 @@ out_add_entry:
out:
return ret;
}
subsys_initcall_sync(efi_runtime_map_init);

45
drivers/firmware/efi/Kconfig
View File

@ -26,39 +26,6 @@ config EFI_VARS_PSTORE_DEFAULT_DISABLE
backend for pstore by default. This setting can be overridden
using the efivars module's pstore_disable parameter.
config EFI_RUNTIME_MAP
bool "Export efi runtime maps to sysfs"
depends on X86 && EFI && KEXEC_CORE
default y
help
Export efi runtime memory maps to /sys/firmware/efi/runtime-map.
That memory map is used for example by kexec to set up efi virtual
mapping the 2nd kernel, but can also be used for debugging purposes.
See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
config EFI_FAKE_MEMMAP
bool "Enable EFI fake memory map"
depends on EFI && X86
default n
help
Saying Y here will enable "efi_fake_mem" boot option.
By specifying this parameter, you can add arbitrary attribute
to specific memory range by updating original (firmware provided)
EFI memmap.
This is useful for debugging of EFI memmap related feature.
e.g. Address Range Mirroring feature.
config EFI_MAX_FAKE_MEM
int "maximum allowable number of ranges in efi_fake_mem boot option"
depends on EFI_FAKE_MEMMAP
range 1 128
default 8
help
Maximum allowable number of ranges in efi_fake_mem boot option.
Ranges can be set up to this value using comma-separated list.
The default value is 8.
config EFI_SOFT_RESERVE
bool "Reserve EFI Specific Purpose Memory"
depends on EFI && EFI_STUB && ACPI_HMAT
@ -139,18 +106,6 @@ config EFI_ARMSTUB_DTB_LOADER
functionality for bootloaders that do not have such support
this option is necessary.
config EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER
bool "Enable the command line initrd loader" if !X86
depends on EFI_STUB && (EFI_GENERIC_STUB || X86)
default y if X86
depends on !RISCV && !LOONGARCH
help
Select this config option to add support for the initrd= command
line parameter, allowing an initrd that resides on the same volume
as the kernel image to be loaded into memory.
This method is deprecated.
config EFI_BOOTLOADER_CONTROL
tristate "EFI Bootloader Control"
select UCS2_STRING

7
drivers/firmware/efi/Makefile
View File

@ -19,11 +19,9 @@ endif
obj-$(CONFIG_EFI_PARAMS_FROM_FDT) += fdtparams.o
obj-$(CONFIG_EFI_ESRT) += esrt.o
obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o
obj-$(CONFIG_UEFI_CPER) += cper.o
obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o
obj-$(CONFIG_UEFI_CPER) += cper.o cper_cxl.o
obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o
subdir-$(CONFIG_EFI_STUB) += libstub
obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_map.o
obj-$(CONFIG_EFI_BOOTLOADER_CONTROL) += efibc.o
obj-$(CONFIG_EFI_TEST) += test/
obj-$(CONFIG_EFI_DEV_PATH_PARSER) += dev-path-parser.o
@ -32,9 +30,6 @@ obj-$(CONFIG_EFI_RCI2_TABLE) += rci2-table.o
obj-$(CONFIG_EFI_EMBEDDED_FIRMWARE) += embedded-firmware.o
obj-$(CONFIG_LOAD_UEFI_KEYS) += mokvar-table.o
fake_map-y += fake_mem.o
fake_map-$(CONFIG_X86) += x86_fake_mem.o
obj-$(CONFIG_SYSFB) += sysfb_efi.o
arm-obj-$(CONFIG_EFI) := efi-init.o arm-runtime.o

9
drivers/firmware/efi/cper.c
View File

@ -24,6 +24,7 @@
#include <linux/bcd.h>
#include <acpi/ghes.h>
#include <ras/ras_event.h>
#include "cper_cxl.h"
/*
* CPER record ID need to be unique even after reboot, because record
@ -598,6 +599,14 @@ cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata
cper_print_fw_err(newpfx, gdata, fw_err);
else
goto err_section_too_small;
} else if (guid_equal(sec_type, &CPER_SEC_CXL_PROT_ERR)) {
struct cper_sec_prot_err *prot_err = acpi_hest_get_payload(gdata);
printk("%ssection_type: CXL Protocol Error\n", newpfx);
if (gdata->error_data_length >= sizeof(*prot_err))
cper_print_prot_err(newpfx, prot_err);
else
goto err_section_too_small;
} else {
const void *err = acpi_hest_get_payload(gdata);

179
drivers/firmware/efi/cper_cxl.c Normal file
View File

@ -0,0 +1,179 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* UEFI Common Platform Error Record (CPER) support for CXL Section.
*
* Copyright (C) 2022 Advanced Micro Devices, Inc.
*
* Author: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
*/
#include <linux/cper.h>
#include "cper_cxl.h"
#include <linux/cxl_err.h>
#define PROT_ERR_VALID_AGENT_TYPE BIT_ULL(0)
#define PROT_ERR_VALID_AGENT_ADDRESS BIT_ULL(1)
#define PROT_ERR_VALID_DEVICE_ID BIT_ULL(2)
#define PROT_ERR_VALID_SERIAL_NUMBER BIT_ULL(3)
#define PROT_ERR_VALID_CAPABILITY BIT_ULL(4)
#define PROT_ERR_VALID_DVSEC BIT_ULL(5)
#define PROT_ERR_VALID_ERROR_LOG BIT_ULL(6)
static const char * const prot_err_agent_type_strs[] = {
"Restricted CXL Device",
"Restricted CXL Host Downstream Port",
"CXL Device",
"CXL Logical Device",
"CXL Fabric Manager managed Logical Device",
"CXL Root Port",
"CXL Downstream Switch Port",
"CXL Upstream Switch Port",
};
/*
* The layout of the enumeration and the values matches CXL Agent Type
* field in the UEFI 2.10 Section N.2.13,
*/
enum {
RCD, /* Restricted CXL Device */
RCH_DP, /* Restricted CXL Host Downstream Port */
DEVICE, /* CXL Device */
LD, /* CXL Logical Device */
FMLD, /* CXL Fabric Manager managed Logical Device */
RP, /* CXL Root Port */
DSP, /* CXL Downstream Switch Port */
USP, /* CXL Upstream Switch Port */
};
void cper_print_prot_err(const char *pfx, const struct cper_sec_prot_err *prot_err)
{
if (prot_err->valid_bits & PROT_ERR_VALID_AGENT_TYPE)
pr_info("%s agent_type: %d, %s\n", pfx, prot_err->agent_type,
prot_err->agent_type < ARRAY_SIZE(prot_err_agent_type_strs)
? prot_err_agent_type_strs[prot_err->agent_type]
: "unknown");
if (prot_err->valid_bits & PROT_ERR_VALID_AGENT_ADDRESS) {
switch (prot_err->agent_type) {
/*
* According to UEFI 2.10 Section N.2.13, the term CXL Device
* is used to refer to Restricted CXL Device, CXL Device, CXL
* Logical Device or a CXL Fabric Manager Managed Logical
* Device.
*/
case RCD:
case DEVICE:
case LD:
case FMLD:
case RP:
case DSP:
case USP:
pr_info("%s agent_address: %04x:%02x:%02x.%x\n",
pfx, prot_err->agent_addr.segment,
prot_err->agent_addr.bus,
prot_err->agent_addr.device,
prot_err->agent_addr.function);
break;
case RCH_DP:
pr_info("%s rcrb_base_address: 0x%016llx\n", pfx,
prot_err->agent_addr.rcrb_base_addr);
break;
default:
break;
}
}
if (prot_err->valid_bits & PROT_ERR_VALID_DEVICE_ID) {
const __u8 *class_code;
switch (prot_err->agent_type) {
case RCD:
case DEVICE:
case LD:
case FMLD:
case RP:
case DSP:
case USP:
pr_info("%s slot: %d\n", pfx,
prot_err->device_id.slot >> CPER_PCIE_SLOT_SHIFT);
pr_info("%s vendor_id: 0x%04x, device_id: 0x%04x\n",
pfx, prot_err->device_id.vendor_id,
prot_err->device_id.device_id);
pr_info("%s sub_vendor_id: 0x%04x, sub_device_id: 0x%04x\n",
pfx, prot_err->device_id.subsystem_vendor_id,
prot_err->device_id.subsystem_id);
class_code = prot_err->device_id.class_code;
pr_info("%s class_code: %02x%02x\n", pfx,
class_code[1], class_code[0]);
break;
default:
break;
}
}
if (prot_err->valid_bits & PROT_ERR_VALID_SERIAL_NUMBER) {
switch (prot_err->agent_type) {
case RCD:
case DEVICE:
case LD:
case FMLD:
pr_info("%s lower_dw: 0x%08x, upper_dw: 0x%08x\n", pfx,
prot_err->dev_serial_num.lower_dw,
prot_err->dev_serial_num.upper_dw);
break;
default:
break;
}
}
if (prot_err->valid_bits & PROT_ERR_VALID_CAPABILITY) {
switch (prot_err->agent_type) {
case RCD:
case DEVICE:
case LD:
case FMLD:
case RP:
case DSP:
case USP:
print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4,
prot_err->capability,
sizeof(prot_err->capability), 0);
break;
default:
break;
}
}
if (prot_err->valid_bits & PROT_ERR_VALID_DVSEC) {
pr_info("%s DVSEC length: 0x%04x\n", pfx, prot_err->dvsec_len);
pr_info("%s CXL DVSEC:\n", pfx);
print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, (prot_err + 1),
prot_err->dvsec_len, 0);
}
if (prot_err->valid_bits & PROT_ERR_VALID_ERROR_LOG) {
size_t size = sizeof(*prot_err) + prot_err->dvsec_len;
struct cxl_ras_capability_regs *cxl_ras;
pr_info("%s Error log length: 0x%04x\n", pfx, prot_err->err_len);
pr_info("%s CXL Error Log:\n", pfx);
cxl_ras = (struct cxl_ras_capability_regs *)((long)prot_err + size);
pr_info("%s cxl_ras_uncor_status: 0x%08x", pfx,
cxl_ras->uncor_status);
pr_info("%s cxl_ras_uncor_mask: 0x%08x\n", pfx,
cxl_ras->uncor_mask);
pr_info("%s cxl_ras_uncor_severity: 0x%08x\n", pfx,
cxl_ras->uncor_severity);
pr_info("%s cxl_ras_cor_status: 0x%08x", pfx,
cxl_ras->cor_status);
pr_info("%s cxl_ras_cor_mask: 0x%08x\n", pfx,
cxl_ras->cor_mask);
pr_info("%s cap_control: 0x%08x\n", pfx,
cxl_ras->cap_control);
pr_info("%s Header Log Registers:\n", pfx);
print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, cxl_ras->header_log,
sizeof(cxl_ras->header_log), 0);
}
}

66
drivers/firmware/efi/cper_cxl.h Normal file
View File

@ -0,0 +1,66 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* UEFI Common Platform Error Record (CPER) support for CXL Section.
*
* Copyright (C) 2022 Advanced Micro Devices, Inc.
*
* Author: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
*/
#ifndef LINUX_CPER_CXL_H
#define LINUX_CPER_CXL_H
/* CXL Protocol Error Section */
#define CPER_SEC_CXL_PROT_ERR \
GUID_INIT(0x80B9EFB4, 0x52B5, 0x4DE3, 0xA7, 0x77, 0x68, 0x78, \
0x4B, 0x77, 0x10, 0x48)
#pragma pack(1)
/* Compute Express Link Protocol Error Section, UEFI v2.10 sec N.2.13 */
struct cper_sec_prot_err {
u64 valid_bits;
u8 agent_type;
u8 reserved[7];
/*
* Except for RCH Downstream Port, all the remaining CXL Agent
* types are uniquely identified by the PCIe compatible SBDF number.
*/
union {
u64 rcrb_base_addr;
struct {
u8 function;
u8 device;
u8 bus;
u16 segment;
u8 reserved_1[3];
};
} agent_addr;
struct {
u16 vendor_id;
u16 device_id;
u16 subsystem_vendor_id;
u16 subsystem_id;
u8 class_code[2];
u16 slot;
u8 reserved_1[4];
} device_id;
struct {
u32 lower_dw;
u32 upper_dw;
} dev_serial_num;
u8 capability[60];
u16 dvsec_len;
u16 err_len;
u8 reserved_2[4];
};
#pragma pack()
void cper_print_prot_err(const char *pfx, const struct cper_sec_prot_err *prot_err);
#endif //__CPER_CXL_

21
drivers/firmware/efi/efi-init.c
View File

@ -22,6 +22,8 @@
#include <asm/efi.h>
unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
static int __init is_memory(efi_memory_desc_t *md)
{
if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
@ -55,9 +57,22 @@ extern __weak const efi_config_table_type_t efi_arch_tables[];
static void __init init_screen_info(void)
{
if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
memblock_is_map_memory(screen_info.lfb_base))
memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
struct screen_info *si;
if (screen_info_table != EFI_INVALID_TABLE_ADDR) {
si = early_memremap(screen_info_table, sizeof(*si));
if (!si) {
pr_err("Could not map screen_info config table\n");
return;
}
screen_info = *si;
memset(si, 0, sizeof(*si));
early_memunmap(si, sizeof(*si));
if (memblock_is_map_memory(screen_info.lfb_base))
memblock_mark_nomap(screen_info.lfb_base,
screen_info.lfb_size);
}
}
static int __init uefi_init(u64 efi_system_table)

23
drivers/firmware/efi/efi-pstore.c
View File

@ -10,7 +10,9 @@ MODULE_IMPORT_NS(EFIVAR);
#define DUMP_NAME_LEN 66
#define EFIVARS_DATA_SIZE_MAX 1024
static unsigned int record_size = 1024;
module_param(record_size, uint, 0444);
MODULE_PARM_DESC(record_size, "size of each pstore UEFI var (in bytes, min/default=1024)");
static bool efivars_pstore_disable =
IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE);
@ -30,7 +32,7 @@ static int efi_pstore_open(struct pstore_info *psi)
if (err)
return err;
psi->data = kzalloc(EFIVARS_DATA_SIZE_MAX, GFP_KERNEL);
psi->data = kzalloc(record_size, GFP_KERNEL);
if (!psi->data)
return -ENOMEM;
@ -52,7 +54,7 @@ static inline u64 generic_id(u64 timestamp, unsigned int part, int count)
static int efi_pstore_read_func(struct pstore_record *record,
efi_char16_t *varname)
{
unsigned long wlen, size = EFIVARS_DATA_SIZE_MAX;
unsigned long wlen, size = record_size;
char name[DUMP_NAME_LEN], data_type;
efi_status_t status;
int cnt;
@ -133,7 +135,7 @@ static ssize_t efi_pstore_read(struct pstore_record *record)
efi_status_t status;
for (;;) {
varname_size = EFIVARS_DATA_SIZE_MAX;
varname_size = 1024;
/*
* If this is the first read() call in the pstore enumeration,
@ -224,11 +226,20 @@ static __init int efivars_pstore_init(void)
if (efivars_pstore_disable)
return 0;
efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL);
/*
* Notice that 1024 is the minimum here to prevent issues with
* decompression algorithms that were spotted during tests;
* even in the case of not using compression, smaller values would
* just pollute more the pstore FS with many small collected files.
*/
if (record_size < 1024)
record_size = 1024;
efi_pstore_info.buf = kmalloc(record_size, GFP_KERNEL);
if (!efi_pstore_info.buf)
return -ENOMEM;
efi_pstore_info.bufsize = 1024;
efi_pstore_info.bufsize = record_size;
if (pstore_register(&efi_pstore_info)) {
kfree(efi_pstore_info.buf);

14
drivers/firmware/efi/efi.c
View File

@ -58,6 +58,8 @@ static unsigned long __initdata mem_reserve = EFI_INVALID_TABLE_ADDR;
static unsigned long __initdata rt_prop = EFI_INVALID_TABLE_ADDR;
static unsigned long __initdata initrd = EFI_INVALID_TABLE_ADDR;
extern unsigned long screen_info_table;
struct mm_struct efi_mm = {
.mm_mt = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, efi_mm.mmap_lock),
.mm_users = ATOMIC_INIT(2),
@ -412,10 +414,6 @@ static int __init efisubsys_init(void)
goto err_unregister;
}
error = efi_runtime_map_init(efi_kobj);
if (error)
goto err_remove_group;
/* and the standard mountpoint for efivarfs */
error = sysfs_create_mount_point(efi_kobj, "efivars");
if (error) {
@ -442,6 +440,7 @@ err_unregister:
generic_ops_unregister();
err_put:
kobject_put(efi_kobj);
efi_kobj = NULL;
destroy_workqueue(efi_rts_wq);
return error;
}
@ -565,6 +564,9 @@ static const efi_config_table_type_t common_tables[] __initconst = {
#endif
#ifdef CONFIG_EFI_COCO_SECRET
{LINUX_EFI_COCO_SECRET_AREA_GUID, &efi.coco_secret, "CocoSecret" },
#endif
#ifdef CONFIG_EFI_GENERIC_STUB
{LINUX_EFI_SCREEN_INFO_TABLE_GUID, &screen_info_table },
#endif
{},
};
@ -630,7 +632,7 @@ int __init efi_config_parse_tables(const efi_config_table_t *config_tables,
seed = early_memremap(efi_rng_seed, sizeof(*seed));
if (seed != NULL) {
size = min(seed->size, EFI_RANDOM_SEED_SIZE);
size = min_t(u32, seed->size, SZ_1K); // sanity check
early_memunmap(seed, sizeof(*seed));
} else {
pr_err("Could not map UEFI random seed!\n");
@ -639,8 +641,8 @@ int __init efi_config_parse_tables(const efi_config_table_t *config_tables,
seed = early_memremap(efi_rng_seed,
sizeof(*seed) + size);
if (seed != NULL) {
pr_notice("seeding entropy pool\n");
add_bootloader_randomness(seed->bits, size);
memzero_explicit(seed->bits, size);
early_memunmap(seed, sizeof(*seed) + size);
} else {
pr_err("Could not map UEFI random seed!\n");

10
drivers/firmware/efi/fake_mem.h
View File

@ -1,10 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __EFI_FAKE_MEM_H__
#define __EFI_FAKE_MEM_H__
#include <asm/efi.h>
#define EFI_MAX_FAKEMEM CONFIG_EFI_MAX_FAKE_MEM
extern struct efi_mem_range efi_fake_mems[EFI_MAX_FAKEMEM];
extern int nr_fake_mem;
#endif /* __EFI_FAKE_MEM_H__ */

4
drivers/firmware/efi/fdtparams.c
View File

@ -30,11 +30,13 @@ static __initconst const char name[][22] = {
static __initconst const struct {
const char path[17];
u8 paravirt;
const char params[PARAMCOUNT][26];
} dt_params[] = {
{
#ifdef CONFIG_XEN // <-------17------>
.path = "/hypervisor/uefi",
.paravirt = 1,
.params = {
[SYSTAB] = "xen,uefi-system-table",
[MMBASE] = "xen,uefi-mmap-start",
@ -121,6 +123,8 @@ u64 __init efi_get_fdt_params(struct efi_memory_map_data *mm)
pr_err("Can't find property '%s' in DT!\n", pname);
return 0;
}
if (dt_params[i].paravirt)
set_bit(EFI_PARAVIRT, &efi.flags);
return systab;
}
notfound:

34
drivers/firmware/efi/libstub/Makefile
View File

@ -5,6 +5,10 @@
# things like ftrace and stack-protector are likely to cause trouble if left
# enabled, even if doing so doesn't break the build.
#
# non-x86 reuses KBUILD_CFLAGS, x86 does not
cflags-y := $(KBUILD_CFLAGS)
cflags-$(CONFIG_X86_32) := -march=i386
cflags-$(CONFIG_X86_64) := -mcmodel=small
cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ \
@ -18,21 +22,20 @@ cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ \
# arm64 uses the full KBUILD_CFLAGS so it's necessary to explicitly
# disable the stackleak plugin
cflags-$(CONFIG_ARM64) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
-fpie $(DISABLE_STACKLEAK_PLUGIN) \
cflags-$(CONFIG_ARM64) += -fpie $(DISABLE_STACKLEAK_PLUGIN) \
-fno-unwind-tables -fno-asynchronous-unwind-tables \
$(call cc-option,-mbranch-protection=none)
cflags-$(CONFIG_ARM) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
-fno-builtin -fpic \
cflags-$(CONFIG_ARM) += -DEFI_HAVE_STRLEN -DEFI_HAVE_STRNLEN \
-DEFI_HAVE_MEMCHR -DEFI_HAVE_STRRCHR \
-DEFI_HAVE_STRCMP -fno-builtin -fpic \
$(call cc-option,-mno-single-pic-base)
cflags-$(CONFIG_RISCV) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
-fpic
cflags-$(CONFIG_LOONGARCH) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
-fpie
cflags-$(CONFIG_RISCV) += -fpic
cflags-$(CONFIG_LOONGARCH) += -fpie
cflags-$(CONFIG_EFI_PARAMS_FROM_FDT) += -I$(srctree)/scripts/dtc/libfdt
KBUILD_CFLAGS := $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \
KBUILD_CFLAGS := $(subst $(CC_FLAGS_FTRACE),,$(cflags-y)) \
-Os -DDISABLE_BRANCH_PROFILING \
-include $(srctree)/include/linux/hidden.h \
-D__NO_FORTIFY \
-ffreestanding \
@ -68,7 +71,7 @@ KCOV_INSTRUMENT := n
lib-y := efi-stub-helper.o gop.o secureboot.o tpm.o \
file.o mem.o random.o randomalloc.o pci.o \
skip_spaces.o lib-cmdline.o lib-ctype.o \
alignedmem.o relocate.o vsprintf.o
alignedmem.o relocate.o printk.o vsprintf.o
# include the stub's libfdt dependencies from lib/ when needed
libfdt-deps := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c \
@ -80,13 +83,14 @@ lib-$(CONFIG_EFI_PARAMS_FROM_FDT) += fdt.o \
$(obj)/lib-%.o: $(srctree)/lib/%.c FORCE
$(call if_changed_rule,cc_o_c)
lib-$(CONFIG_EFI_GENERIC_STUB) += efi-stub.o string.o intrinsics.o systable.o
lib-$(CONFIG_EFI_GENERIC_STUB) += efi-stub.o string.o intrinsics.o systable.o \
screen_info.o efi-stub-entry.o
lib-$(CONFIG_ARM) += arm32-stub.o
lib-$(CONFIG_ARM64) += arm64-stub.o smbios.o
lib-$(CONFIG_ARM64) += arm64.o arm64-stub.o arm64-entry.o smbios.o
lib-$(CONFIG_X86) += x86-stub.o
lib-$(CONFIG_RISCV) += riscv-stub.o
lib-$(CONFIG_LOONGARCH) += loongarch-stub.o
lib-$(CONFIG_RISCV) += riscv.o riscv-stub.o
lib-$(CONFIG_LOONGARCH) += loongarch.o loongarch-stub.o
CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
@ -137,7 +141,7 @@ STUBCOPY_RELOC-$(CONFIG_ARM) := R_ARM_ABS
#
STUBCOPY_FLAGS-$(CONFIG_ARM64) += --prefix-alloc-sections=.init \
--prefix-symbols=__efistub_
STUBCOPY_RELOC-$(CONFIG_ARM64) := R_AARCH64_ABS
STUBCOPY_RELOC-$(CONFIG_ARM64) := R_AARCH64_ABS64
# For RISC-V, we don't need anything special other than arm64. Keep all the
# symbols in .init section and make sure that no absolute symbols references

22
drivers/firmware/efi/libstub/Makefile.zboot
View File

@ -10,18 +10,17 @@ comp-type-$(CONFIG_KERNEL_LZO) := lzo
comp-type-$(CONFIG_KERNEL_XZ) := xzkern
comp-type-$(CONFIG_KERNEL_ZSTD) := zstd22
# in GZIP, the appended le32 carrying the uncompressed size is part of the
# format, but in other cases, we just append it at the end for convenience,
# causing the original tools to complain when checking image integrity.
# So disregard it when calculating the payload size in the zimage header.
zboot-method-y := $(comp-type-y)_with_size
zboot-size-len-y := 4
zboot-method-$(CONFIG_KERNEL_GZIP) := gzip
zboot-size-len-$(CONFIG_KERNEL_GZIP) := 0
# Copy the SizeOfHeaders, SizeOfCode and SizeOfImage fields from the payload to
# the end of the compressed image. Note that this presupposes a PE header
# offset of 64 bytes, which is what arm64, RISC-V and LoongArch use.
quiet_cmd_compwithsize = $(quiet_cmd_$(comp-type-y))
cmd_compwithsize = $(cmd_$(comp-type-y)) && ( \
dd status=none if=$< bs=4 count=1 skip=37 ; \
dd status=none if=$< bs=4 count=1 skip=23 ; \
dd status=none if=$< bs=4 count=1 skip=36 ) >> $@
$(obj)/vmlinuz: $(obj)/$(EFI_ZBOOT_PAYLOAD) FORCE
$(call if_changed,$(zboot-method-y))
$(call if_changed,compwithsize)
OBJCOPYFLAGS_vmlinuz.o := -I binary -O $(EFI_ZBOOT_BFD_TARGET) \
--rename-section .data=.gzdata,load,alloc,readonly,contents
@ -30,7 +29,6 @@ $(obj)/vmlinuz.o: $(obj)/vmlinuz FORCE
AFLAGS_zboot-header.o += -DMACHINE_TYPE=IMAGE_FILE_MACHINE_$(EFI_ZBOOT_MACH_TYPE) \
-DZBOOT_EFI_PATH="\"$(realpath $(obj)/vmlinuz.efi.elf)\"" \
-DZBOOT_SIZE_LEN=$(zboot-size-len-y) \
-DCOMP_TYPE="\"$(comp-type-y)\""
$(obj)/zboot-header.o: $(srctree)/drivers/firmware/efi/libstub/zboot-header.S FORCE
@ -46,4 +44,4 @@ OBJCOPYFLAGS_vmlinuz.efi := -O binary
$(obj)/vmlinuz.efi: $(obj)/vmlinuz.efi.elf FORCE
$(call if_changed,objcopy)
targets += zboot-header.o vmlinuz vmlinuz.o vmlinuz.efi.elf vmlinuz.efi
targets += zboot-header.o vmlinuz.o vmlinuz.efi.elf vmlinuz.efi

7
drivers/firmware/efi/libstub/alignedmem.c
View File

@ -22,12 +22,15 @@
* Return: status code
*/
efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr,
unsigned long max, unsigned long align)
unsigned long max, unsigned long align,
int memory_type)
{
efi_physical_addr_t alloc_addr;
efi_status_t status;
int slack;
max = min(max, EFI_ALLOC_LIMIT);
if (align < EFI_ALLOC_ALIGN)
align = EFI_ALLOC_ALIGN;
@ -36,7 +39,7 @@ efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr,
slack = align / EFI_PAGE_SIZE - 1;
status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS,
EFI_LOADER_DATA, size / EFI_PAGE_SIZE + slack,
memory_type, size / EFI_PAGE_SIZE + slack,
&alloc_addr);
if (status != EFI_SUCCESS)
return status;

37
drivers/firmware/efi/libstub/arm32-stub.c
View File

@ -76,43 +76,6 @@ void efi_handle_post_ebs_state(void)
&efi_entry_state->sctlr_after_ebs);
}
static efi_guid_t screen_info_guid = LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID;
struct screen_info *alloc_screen_info(void)
{
struct screen_info *si;
efi_status_t status;
/*
* Unlike on arm64, where we can directly fill out the screen_info
* structure from the stub, we need to allocate a buffer to hold
* its contents while we hand over to the kernel proper from the
* decompressor.
*/
status = efi_bs_call(allocate_pool, EFI_RUNTIME_SERVICES_DATA,
sizeof(*si), (void **)&si);
if (status != EFI_SUCCESS)
return NULL;
status = efi_bs_call(install_configuration_table,
&screen_info_guid, si);
if (status == EFI_SUCCESS)
return si;
efi_bs_call(free_pool, si);
return NULL;
}
void free_screen_info(struct screen_info *si)
{
if (!si)
return;
efi_bs_call(install_configuration_table, &screen_info_guid, NULL);
efi_bs_call(free_pool, si);
}
efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,

67
drivers/firmware/efi/libstub/arm64-entry.S Normal file
View File

@ -0,0 +1,67 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* EFI entry point.
*
* Copyright (C) 2013, 2014 Red Hat, Inc.
* Author: Mark Salter <msalter@redhat.com>
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
/*
* The entrypoint of a arm64 bare metal image is at offset #0 of the
* image, so this is a reasonable default for primary_entry_offset.
* Only when the EFI stub is integrated into the core kernel, it is not
* guaranteed that the PE/COFF header has been copied to memory too, so
* in this case, primary_entry_offset should be overridden by the
* linker and point to primary_entry() directly.
*/
.weak primary_entry_offset
SYM_CODE_START(efi_enter_kernel)
/*
* efi_pe_entry() will have copied the kernel image if necessary and we
* end up here with device tree address in x1 and the kernel entry
* point stored in x0. Save those values in registers which are
* callee preserved.
*/
ldr w2, =primary_entry_offset
add x19, x0, x2 // relocated Image entrypoint
mov x0, x1 // DTB address
mov x1, xzr
mov x2, xzr
mov x3, xzr
/*
* Clean the remainder of this routine to the PoC
* so that we can safely disable the MMU and caches.
*/
adr x4, 1f
dc civac, x4
dsb sy
/* Turn off Dcache and MMU */
mrs x4, CurrentEL
cmp x4, #CurrentEL_EL2
mrs x4, sctlr_el1
b.ne 0f
mrs x4, sctlr_el2
0: bic x4, x4, #SCTLR_ELx_M
bic x4, x4, #SCTLR_ELx_C
b.eq 1f
b 2f
.balign 32
1: pre_disable_mmu_workaround
msr sctlr_el2, x4
isb
br x19 // jump to kernel entrypoint
2: pre_disable_mmu_workaround
msr sctlr_el1, x4
isb
br x19 // jump to kernel entrypoint
.org 1b + 32
SYM_CODE_END(efi_enter_kernel)

75
drivers/firmware/efi/libstub/arm64-stub.c
View File

@ -11,52 +11,9 @@
#include <asm/efi.h>
#include <asm/memory.h>
#include <asm/sections.h>
#include <asm/sysreg.h>
#include "efistub.h"
static bool system_needs_vamap(void)
{
const u8 *type1_family = efi_get_smbios_string(1, family);
/*
* Ampere Altra machines crash in SetTime() if SetVirtualAddressMap()
* has not been called prior.
*/
if (!type1_family || strcmp(type1_family, "Altra"))
return false;
efi_warn("Working around broken SetVirtualAddressMap()\n");
return true;
}
efi_status_t check_platform_features(void)
{
u64 tg;
/*
* If we have 48 bits of VA space for TTBR0 mappings, we can map the
* UEFI runtime regions 1:1 and so calling SetVirtualAddressMap() is
* unnecessary.
*/
if (VA_BITS_MIN >= 48 && !system_needs_vamap())
efi_novamap = true;
/* UEFI mandates support for 4 KB granularity, no need to check */
if (IS_ENABLED(CONFIG_ARM64_4K_PAGES))
return EFI_SUCCESS;
tg = (read_cpuid(ID_AA64MMFR0_EL1) >> ID_AA64MMFR0_EL1_TGRAN_SHIFT) & 0xf;
if (tg < ID_AA64MMFR0_EL1_TGRAN_SUPPORTED_MIN || tg > ID_AA64MMFR0_EL1_TGRAN_SUPPORTED_MAX) {
if (IS_ENABLED(CONFIG_ARM64_64K_PAGES))
efi_err("This 64 KB granular kernel is not supported by your CPU\n");
else
efi_err("This 16 KB granular kernel is not supported by your CPU\n");
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
/*
* Distro versions of GRUB may ignore the BSS allocation entirely (i.e., fail
* to provide space, and fail to zero it). Check for this condition by double
@ -103,16 +60,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
efi_status_t status;
unsigned long kernel_size, kernel_memsize = 0;
u32 phys_seed = 0;
/*
* Although relocatable kernels can fix up the misalignment with
* respect to MIN_KIMG_ALIGN, the resulting virtual text addresses are
* subtly out of sync with those recorded in the vmlinux when kaslr is
* disabled but the image required relocation anyway. Therefore retain
* 2M alignment if KASLR was explicitly disabled, even if it was not
* going to be activated to begin with.
*/
u64 min_kimg_align = efi_nokaslr ? MIN_KIMG_ALIGN : EFI_KIMG_ALIGN;
u64 min_kimg_align = efi_get_kimg_min_align();
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
efi_guid_t li_fixed_proto = LINUX_EFI_LOADED_IMAGE_FIXED_GUID;
@ -154,7 +102,8 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
* locate the kernel at a randomized offset in physical memory.
*/
status = efi_random_alloc(*reserve_size, min_kimg_align,
reserve_addr, phys_seed);
reserve_addr, phys_seed,
EFI_LOADER_CODE);
if (status != EFI_SUCCESS)
efi_warn("efi_random_alloc() failed: 0x%lx\n", status);
} else {
@ -164,18 +113,20 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
if (status != EFI_SUCCESS) {
if (!check_image_region((u64)_text, kernel_memsize)) {
efi_err("FIRMWARE BUG: Image BSS overlaps adjacent EFI memory region\n");
} else if (IS_ALIGNED((u64)_text, min_kimg_align)) {
} else if (IS_ALIGNED((u64)_text, min_kimg_align) &&
(u64)_end < EFI_ALLOC_LIMIT) {
/*
* Just execute from wherever we were loaded by the
* UEFI PE/COFF loader if the alignment is suitable.
* UEFI PE/COFF loader if the placement is suitable.
*/
*image_addr = (u64)_text;
*reserve_size = 0;
return EFI_SUCCESS;
goto clean_image_to_poc;
}
status = efi_allocate_pages_aligned(*reserve_size, reserve_addr,
ULONG_MAX, min_kimg_align);
ULONG_MAX, min_kimg_align,
EFI_LOADER_CODE);
if (status != EFI_SUCCESS) {
efi_err("Failed to relocate kernel\n");
@ -187,5 +138,13 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
*image_addr = *reserve_addr;
memcpy((void *)*image_addr, _text, kernel_size);
clean_image_to_poc:
/*
* Clean the copied Image to the PoC, and ensure it is not shadowed by
* stale icache entries from before relocation.
*/
dcache_clean_poc(*image_addr, *image_addr + kernel_size);
asm("ic ialluis");
return EFI_SUCCESS;
}

76
drivers/firmware/efi/libstub/arm64.c Normal file
View File

@ -0,0 +1,76 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2013, 2014 Linaro Ltd; <roy.franz@linaro.org>
*
* This file implements the EFI boot stub for the arm64 kernel.
* Adapted from ARM version by Mark Salter <msalter@redhat.com>
*/
#include <linux/efi.h>
#include <asm/efi.h>
#include <asm/memory.h>
#include <asm/sysreg.h>
#include "efistub.h"
static bool system_needs_vamap(void)
{
const u8 *type1_family = efi_get_smbios_string(1, family);
/*
* Ampere Altra machines crash in SetTime() if SetVirtualAddressMap()
* has not been called prior.
*/
if (!type1_family || strcmp(type1_family, "Altra"))
return false;
efi_warn("Working around broken SetVirtualAddressMap()\n");
return true;
}
efi_status_t check_platform_features(void)
{
u64 tg;
/*
* If we have 48 bits of VA space for TTBR0 mappings, we can map the
* UEFI runtime regions 1:1 and so calling SetVirtualAddressMap() is
* unnecessary.
*/
if (VA_BITS_MIN >= 48 && !system_needs_vamap())
efi_novamap = true;
/* UEFI mandates support for 4 KB granularity, no need to check */
if (IS_ENABLED(CONFIG_ARM64_4K_PAGES))
return EFI_SUCCESS;
tg = (read_cpuid(ID_AA64MMFR0_EL1) >> ID_AA64MMFR0_EL1_TGRAN_SHIFT) & 0xf;
if (tg < ID_AA64MMFR0_EL1_TGRAN_SUPPORTED_MIN || tg > ID_AA64MMFR0_EL1_TGRAN_SUPPORTED_MAX) {
if (IS_ENABLED(CONFIG_ARM64_64K_PAGES))
efi_err("This 64 KB granular kernel is not supported by your CPU\n");
else
efi_err("This 16 KB granular kernel is not supported by your CPU\n");
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
void efi_cache_sync_image(unsigned long image_base,
unsigned long alloc_size,
unsigned long code_size)
{
u32 ctr = read_cpuid_effective_cachetype();
u64 lsize = 4 << cpuid_feature_extract_unsigned_field(ctr,
CTR_EL0_DminLine_SHIFT);
do {
asm("dc civac, %0" :: "r"(image_base));
image_base += lsize;
alloc_size -= lsize;
} while (alloc_size >= lsize);
asm("ic ialluis");
dsb(ish);
isb();
}

65
drivers/firmware/efi/libstub/efi-stub-entry.c Normal file
View File

@ -0,0 +1,65 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
/*
* EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and
* LoongArch. This is the entrypoint that is described in the PE/COFF header
* of the core kernel.
*/
efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
efi_system_table_t *systab)
{
efi_loaded_image_t *image;
efi_status_t status;
unsigned long image_addr;
unsigned long image_size = 0;
/* addr/point and size pairs for memory management*/
char *cmdline_ptr = NULL;
efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
unsigned long reserve_addr = 0;
unsigned long reserve_size = 0;
WRITE_ONCE(efi_system_table, systab);
/* Check if we were booted by the EFI firmware */
if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
return EFI_INVALID_PARAMETER;
/*
* Get a handle to the loaded image protocol. This is used to get
* information about the running image, such as size and the command
* line.
*/
status = efi_bs_call(handle_protocol, handle, &loaded_image_proto,
(void *)&image);
if (status != EFI_SUCCESS) {
efi_err("Failed to get loaded image protocol\n");
return status;
}
status = efi_handle_cmdline(image, &cmdline_ptr);
if (status != EFI_SUCCESS)
return status;
efi_info("Booting Linux Kernel...\n");
status = handle_kernel_image(&image_addr, &image_size,
&reserve_addr,
&reserve_size,
image, handle);
if (status != EFI_SUCCESS) {
efi_err("Failed to relocate kernel\n");
return status;
}
status = efi_stub_common(handle, image, image_addr, cmdline_ptr);
efi_free(image_size, image_addr);
efi_free(reserve_size, reserve_addr);
return status;
}

150
drivers/firmware/efi/libstub/efi-stub-helper.c
View File

@ -9,10 +9,8 @@
#include <linux/stdarg.h>
#include <linux/ctype.h>
#include <linux/efi.h>
#include <linux/kernel.h>
#include <linux/printk.h> /* For CONSOLE_LOGLEVEL_* */
#include <asm/efi.h>
#include <asm/setup.h>
@ -20,7 +18,6 @@
bool efi_nochunk;
bool efi_nokaslr = !IS_ENABLED(CONFIG_RANDOMIZE_BASE);
int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
bool efi_novamap;
static bool efi_noinitrd;
@ -32,146 +29,6 @@ bool __pure __efi_soft_reserve_enabled(void)
return !efi_nosoftreserve;
}
/**
* efi_char16_puts() - Write a UCS-2 encoded string to the console
* @str: UCS-2 encoded string
*/
void efi_char16_puts(efi_char16_t *str)
{
efi_call_proto(efi_table_attr(efi_system_table, con_out),
output_string, str);
}
static
u32 utf8_to_utf32(const u8 **s8)
{
u32 c32;
u8 c0, cx;
size_t clen, i;
c0 = cx = *(*s8)++;
/*
* The position of the most-significant 0 bit gives us the length of
* a multi-octet encoding.
*/
for (clen = 0; cx & 0x80; ++clen)
cx <<= 1;
/*
* If the 0 bit is in position 8, this is a valid single-octet
* encoding. If the 0 bit is in position 7 or positions 1-3, the
* encoding is invalid.
* In either case, we just return the first octet.
*/
if (clen < 2 || clen > 4)
return c0;
/* Get the bits from the first octet. */
c32 = cx >> clen--;
for (i = 0; i < clen; ++i) {
/* Trailing octets must have 10 in most significant bits. */
cx = (*s8)[i] ^ 0x80;
if (cx & 0xc0)
return c0;
c32 = (c32 << 6) | cx;
}
/*
* Check for validity:
* - The character must be in the Unicode range.
* - It must not be a surrogate.
* - It must be encoded using the correct number of octets.
*/
if (c32 > 0x10ffff ||
(c32 & 0xf800) == 0xd800 ||
clen != (c32 >= 0x80) + (c32 >= 0x800) + (c32 >= 0x10000))
return c0;
*s8 += clen;
return c32;
}
/**
* efi_puts() - Write a UTF-8 encoded string to the console
* @str: UTF-8 encoded string
*/
void efi_puts(const char *str)
{
efi_char16_t buf[128];
size_t pos = 0, lim = ARRAY_SIZE(buf);
const u8 *s8 = (const u8 *)str;
u32 c32;
while (*s8) {
if (*s8 == '\n')
buf[pos++] = L'\r';
c32 = utf8_to_utf32(&s8);
if (c32 < 0x10000) {
/* Characters in plane 0 use a single word. */
buf[pos++] = c32;
} else {
/*
* Characters in other planes encode into a surrogate
* pair.
*/
buf[pos++] = (0xd800 - (0x10000 >> 10)) + (c32 >> 10);
buf[pos++] = 0xdc00 + (c32 & 0x3ff);
}
if (*s8 == '\0' || pos >= lim - 2) {
buf[pos] = L'\0';
efi_char16_puts(buf);
pos = 0;
}
}
}
/**
* efi_printk() - Print a kernel message
* @fmt: format string
*
* The first letter of the format string is used to determine the logging level
* of the message. If the level is less then the current EFI logging level, the
* message is suppressed. The message will be truncated to 255 bytes.
*
* Return: number of printed characters
*/
int efi_printk(const char *fmt, ...)
{
char printf_buf[256];
va_list args;
int printed;
int loglevel = printk_get_level(fmt);
switch (loglevel) {
case '0' ... '9':
loglevel -= '0';
break;
default:
/*
* Use loglevel -1 for cases where we just want to print to
* the screen.
*/
loglevel = -1;
break;
}
if (loglevel >= efi_loglevel)
return 0;
if (loglevel >= 0)
efi_puts("EFI stub: ");
fmt = printk_skip_level(fmt);
va_start(args, fmt);
printed = vsnprintf(printf_buf, sizeof(printf_buf), fmt, args);
va_end(args);
efi_puts(printf_buf);
if (printed >= sizeof(printf_buf)) {
efi_puts("[Message truncated]\n");
return -1;
}
return printed;
}
/**
* efi_parse_options() - Parse EFI command line options
* @cmdline: kernel command line
@ -626,8 +483,8 @@ static const struct {
/**
* efi_load_initrd_dev_path() - load the initrd from the Linux initrd device path
* @load_addr: pointer to store the address where the initrd was loaded
* @load_size: pointer to store the size of the loaded initrd
* @initrd: pointer of struct to store the address where the initrd was loaded
* and the size of the loaded initrd
* @max: upper limit for the initrd memory allocation
*
* Return:
@ -681,8 +538,7 @@ efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image,
unsigned long soft_limit,
unsigned long hard_limit)
{
if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER) ||
(IS_ENABLED(CONFIG_X86) && (!efi_is_native() || image == NULL)))
if (image == NULL)
return EFI_UNSUPPORTED;
return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2,

140
drivers/firmware/efi/libstub/efi-stub.c
View File

@ -35,15 +35,6 @@
* as well to minimize the code churn.
*/
#define EFI_RT_VIRTUAL_BASE SZ_512M
#define EFI_RT_VIRTUAL_SIZE SZ_512M
#ifdef CONFIG_ARM64
# define EFI_RT_VIRTUAL_LIMIT DEFAULT_MAP_WINDOW_64
#elif defined(CONFIG_RISCV) || defined(CONFIG_LOONGARCH)
# define EFI_RT_VIRTUAL_LIMIT TASK_SIZE_MIN
#else /* Only if TASK_SIZE is a constant */
# define EFI_RT_VIRTUAL_LIMIT TASK_SIZE
#endif
/*
* Some architectures map the EFI regions into the kernel's linear map using a
@ -56,6 +47,15 @@
static u64 virtmap_base = EFI_RT_VIRTUAL_BASE;
static bool flat_va_mapping = (EFI_RT_VIRTUAL_OFFSET != 0);
struct screen_info * __weak alloc_screen_info(void)
{
return &screen_info;
}
void __weak free_screen_info(struct screen_info *si)
{
}
static struct screen_info *setup_graphics(void)
{
efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
@ -115,62 +115,21 @@ static u32 get_supported_rt_services(void)
return supported;
}
/*
* EFI entry point for the arm/arm64 EFI stubs. This is the entrypoint
* that is described in the PE/COFF header. Most of the code is the same
* for both archictectures, with the arch-specific code provided in the
* handle_kernel_image() function.
*/
efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
efi_system_table_t *sys_table_arg)
efi_status_t efi_handle_cmdline(efi_loaded_image_t *image, char **cmdline_ptr)
{
efi_loaded_image_t *image;
efi_status_t status;
unsigned long image_addr;
unsigned long image_size = 0;
/* addr/point and size pairs for memory management*/
char *cmdline_ptr = NULL;
int cmdline_size = 0;
efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
unsigned long reserve_addr = 0;
unsigned long reserve_size = 0;
struct screen_info *si;
efi_properties_table_t *prop_tbl;
efi_system_table = sys_table_arg;
/* Check if we were booted by the EFI firmware */
if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
status = EFI_INVALID_PARAMETER;
goto fail;
}
status = check_platform_features();
if (status != EFI_SUCCESS)
goto fail;
/*
* Get a handle to the loaded image protocol. This is used to get
* information about the running image, such as size and the command
* line.
*/
status = efi_bs_call(handle_protocol, handle, &loaded_image_proto,
(void *)&image);
if (status != EFI_SUCCESS) {
efi_err("Failed to get loaded image protocol\n");
goto fail;
}
efi_status_t status;
char *cmdline;
/*
* Get the command line from EFI, using the LOADED_IMAGE
* protocol. We are going to copy the command line into the
* device tree, so this can be allocated anywhere.
*/
cmdline_ptr = efi_convert_cmdline(image, &cmdline_size);
if (!cmdline_ptr) {
cmdline = efi_convert_cmdline(image, &cmdline_size);
if (!cmdline) {
efi_err("getting command line via LOADED_IMAGE_PROTOCOL\n");
status = EFI_OUT_OF_RESOURCES;
goto fail;
return EFI_OUT_OF_RESOURCES;
}
if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
@ -184,26 +143,35 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
}
if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0) {
status = efi_parse_options(cmdline_ptr);
status = efi_parse_options(cmdline);
if (status != EFI_SUCCESS) {
efi_err("Failed to parse options\n");
goto fail_free_cmdline;
}
}
efi_info("Booting Linux Kernel...\n");
*cmdline_ptr = cmdline;
return EFI_SUCCESS;
fail_free_cmdline:
efi_bs_call(free_pool, cmdline_ptr);
return status;
}
efi_status_t efi_stub_common(efi_handle_t handle,
efi_loaded_image_t *image,
unsigned long image_addr,
char *cmdline_ptr)
{
struct screen_info *si;
efi_status_t status;
status = check_platform_features();
if (status != EFI_SUCCESS)
return status;
si = setup_graphics();
status = handle_kernel_image(&image_addr, &image_size,
&reserve_addr,
&reserve_size,
image, handle);
if (status != EFI_SUCCESS) {
efi_err("Failed to relocate kernel\n");
goto fail_free_screeninfo;
}
efi_retrieve_tpm2_eventlog();
/* Ask the firmware to clear memory on unclean shutdown */
@ -214,53 +182,15 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
efi_random_get_seed();
/*
* If the NX PE data feature is enabled in the properties table, we
* should take care not to create a virtual mapping that changes the
* relative placement of runtime services code and data regions, as
* they may belong to the same PE/COFF executable image in memory.
* The easiest way to achieve that is to simply use a 1:1 mapping.
*/
prop_tbl = get_efi_config_table(EFI_PROPERTIES_TABLE_GUID);
flat_va_mapping |= prop_tbl &&
(prop_tbl->memory_protection_attribute &
EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA);
/* force efi_novamap if SetVirtualAddressMap() is unsupported */
efi_novamap |= !(get_supported_rt_services() &
EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP);
/* hibernation expects the runtime regions to stay in the same place */
if (!IS_ENABLED(CONFIG_HIBERNATION) && !efi_nokaslr && !flat_va_mapping) {
/*
* Randomize the base of the UEFI runtime services region.
* Preserve the 2 MB alignment of the region by taking a
* shift of 21 bit positions into account when scaling
* the headroom value using a 32-bit random value.
*/
static const u64 headroom = EFI_RT_VIRTUAL_LIMIT -
EFI_RT_VIRTUAL_BASE -
EFI_RT_VIRTUAL_SIZE;
u32 rnd;
status = efi_get_random_bytes(sizeof(rnd), (u8 *)&rnd);
if (status == EFI_SUCCESS) {
virtmap_base = EFI_RT_VIRTUAL_BASE +
(((headroom >> 21) * rnd) >> (32 - 21));
}
}
install_memreserve_table();
status = efi_boot_kernel(handle, image, image_addr, cmdline_ptr);
efi_free(image_size, image_addr);
efi_free(reserve_size, reserve_addr);
fail_free_screeninfo:
free_screen_info(si);
fail_free_cmdline:
efi_bs_call(free_pool, cmdline_ptr);
fail:
return status;
}

109
drivers/firmware/efi/libstub/efistub.h
View File

@ -29,6 +29,10 @@
#define EFI_ALLOC_ALIGN EFI_PAGE_SIZE
#endif
#ifndef EFI_ALLOC_LIMIT
#define EFI_ALLOC_LIMIT ULONG_MAX
#endif
extern bool efi_nochunk;
extern bool efi_nokaslr;
extern int efi_loglevel;
@ -45,14 +49,22 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
#ifndef ARCH_HAS_EFISTUB_WRAPPERS
#define efi_is_native() (true)
#define efi_bs_call(func, ...) efi_system_table->boottime->func(__VA_ARGS__)
#define efi_rt_call(func, ...) efi_system_table->runtime->func(__VA_ARGS__)
#define efi_dxe_call(func, ...) efi_dxe_table->func(__VA_ARGS__)
#define efi_table_attr(inst, attr) (inst->attr)
#define efi_call_proto(inst, func, ...) inst->func(inst, ##__VA_ARGS__)
#define efi_table_attr(inst, attr) (inst)->attr
#define efi_fn_call(inst, func, ...) (inst)->func(__VA_ARGS__)
#endif
#define efi_call_proto(inst, func, ...) ({ \
__typeof__(inst) __inst = (inst); \
efi_fn_call(__inst, func, __inst, ##__VA_ARGS__); \
})
#define efi_bs_call(func, ...) \
efi_fn_call(efi_table_attr(efi_system_table, boottime), func, ##__VA_ARGS__)
#define efi_rt_call(func, ...) \
efi_fn_call(efi_table_attr(efi_system_table, runtime), func, ##__VA_ARGS__)
#define efi_dxe_call(func, ...) \
efi_fn_call(efi_dxe_table, func, ##__VA_ARGS__)
#define efi_info(fmt, ...) \
efi_printk(KERN_INFO fmt, ##__VA_ARGS__)
#define efi_warn(fmt, ...) \
@ -179,6 +191,21 @@ union efi_device_path_to_text_protocol {
typedef union efi_device_path_to_text_protocol efi_device_path_to_text_protocol_t;
union efi_device_path_from_text_protocol {
struct {
efi_device_path_protocol_t *
(__efiapi *convert_text_to_device_node)(const efi_char16_t *);
efi_device_path_protocol_t *
(__efiapi *convert_text_to_device_path)(const efi_char16_t *);
};
struct {
u32 convert_text_to_device_node;
u32 convert_text_to_device_path;
} mixed_mode;
};
typedef union efi_device_path_from_text_protocol efi_device_path_from_text_protocol_t;
typedef void *efi_event_t;
/* Note that notifications won't work in mixed mode */
typedef void (__efiapi *efi_event_notify_t)(efi_event_t, void *);
@ -572,36 +599,63 @@ typedef struct {
efi_char16_t filename[];
} efi_file_info_t;
typedef struct efi_file_protocol efi_file_protocol_t;
typedef union efi_file_protocol efi_file_protocol_t;
struct efi_file_protocol {
union efi_file_protocol {
struct {
u64 revision;
efi_status_t (__efiapi *open) (efi_file_protocol_t *,
efi_file_protocol_t **,
efi_char16_t *, u64, u64);
efi_char16_t *, u64,
u64);
efi_status_t (__efiapi *close) (efi_file_protocol_t *);
efi_status_t (__efiapi *delete) (efi_file_protocol_t *);
efi_status_t (__efiapi *read) (efi_file_protocol_t *,
unsigned long *, void *);
unsigned long *,
void *);
efi_status_t (__efiapi *write) (efi_file_protocol_t *,
unsigned long, void *);
efi_status_t (__efiapi *get_position)(efi_file_protocol_t *, u64 *);
efi_status_t (__efiapi *set_position)(efi_file_protocol_t *, u64);
efi_status_t (__efiapi *get_position)(efi_file_protocol_t *,
u64 *);
efi_status_t (__efiapi *set_position)(efi_file_protocol_t *,
u64);
efi_status_t (__efiapi *get_info) (efi_file_protocol_t *,
efi_guid_t *, unsigned long *,
efi_guid_t *,
unsigned long *,
void *);
efi_status_t (__efiapi *set_info) (efi_file_protocol_t *,
efi_guid_t *, unsigned long,
efi_guid_t *,
unsigned long,
void *);
efi_status_t (__efiapi *flush) (efi_file_protocol_t *);
};
struct {
u64 revision;
u32 open;
u32 close;
u32 delete;
u32 read;
u32 write;
u32 get_position;
u32 set_position;
u32 get_info;
u32 set_info;
u32 flush;
} mixed_mode;
};
typedef struct efi_simple_file_system_protocol efi_simple_file_system_protocol_t;
typedef union efi_simple_file_system_protocol efi_simple_file_system_protocol_t;
struct efi_simple_file_system_protocol {
union efi_simple_file_system_protocol {
struct {
u64 revision;
int (__efiapi *open_volume)(efi_simple_file_system_protocol_t *,
efi_status_t (__efiapi *open_volume)(efi_simple_file_system_protocol_t *,
efi_file_protocol_t **);
};
struct {
u64 revision;
u32 open_volume;
} mixed_mode;
};
#define EFI_FILE_MODE_READ 0x0000000000000001
@ -880,7 +934,10 @@ void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
efi_status_t efi_get_random_bytes(unsigned long size, u8 *out);
efi_status_t efi_random_alloc(unsigned long size, unsigned long align,
unsigned long *addr, unsigned long random_seed);
unsigned long *addr, unsigned long random_seed,
int memory_type);
efi_status_t efi_random_get_seed(void);
efi_status_t check_platform_features(void);
@ -905,7 +962,8 @@ efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr,
unsigned long max);
efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr,
unsigned long max, unsigned long align);
unsigned long max, unsigned long align,
int memory_type);
efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
unsigned long *addr, unsigned long min);
@ -958,6 +1016,14 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
efi_loaded_image_t *image,
efi_handle_t image_handle);
/* shared entrypoint between the normal stub and the zboot stub */
efi_status_t efi_stub_common(efi_handle_t handle,
efi_loaded_image_t *image,
unsigned long image_addr,
char *cmdline_ptr);
efi_status_t efi_handle_cmdline(efi_loaded_image_t *image, char **cmdline_ptr);
asmlinkage void __noreturn efi_enter_kernel(unsigned long entrypoint,
unsigned long fdt_addr,
unsigned long fdt_size);
@ -975,6 +1041,13 @@ efi_enable_reset_attack_mitigation(void) { }
void efi_retrieve_tpm2_eventlog(void);
struct screen_info *alloc_screen_info(void);
void free_screen_info(struct screen_info *si);
void efi_cache_sync_image(unsigned long image_base,
unsigned long alloc_size,
unsigned long code_size);
struct efi_smbios_record {
u8 type;
u8 length;

118
drivers/firmware/efi/libstub/file.c
View File

@ -43,18 +43,26 @@ static efi_status_t efi_open_file(efi_file_protocol_t *volume,
efi_file_protocol_t *fh;
unsigned long info_sz;
efi_status_t status;
efi_char16_t *c;
status = volume->open(volume, &fh, fi->filename, EFI_FILE_MODE_READ, 0);
/* Replace UNIX dir separators with EFI standard ones */
for (c = fi->filename; *c != L'\0'; c++) {
if (*c == L'/')
*c = L'\\';
}
status = efi_call_proto(volume, open, &fh, fi->filename,
EFI_FILE_MODE_READ, 0);
if (status != EFI_SUCCESS) {
efi_err("Failed to open file: %ls\n", fi->filename);
return status;
}
info_sz = sizeof(struct finfo);
status = fh->get_info(fh, &info_guid, &info_sz, fi);
status = efi_call_proto(fh, get_info, &info_guid, &info_sz, fi);
if (status != EFI_SUCCESS) {
efi_err("Failed to get file info\n");
fh->close(fh);
efi_call_proto(fh, close);
return status;
}
@ -66,36 +74,18 @@ static efi_status_t efi_open_file(efi_file_protocol_t *volume,
static efi_status_t efi_open_volume(efi_loaded_image_t *image,
efi_file_protocol_t **fh)
{
struct efi_vendor_dev_path *dp = image->file_path;
efi_guid_t li_proto = LOADED_IMAGE_PROTOCOL_GUID;
efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
efi_simple_file_system_protocol_t *io;
efi_status_t status;
// If we are using EFI zboot, we should look for the file system
// protocol on the parent image's handle instead
if (IS_ENABLED(CONFIG_EFI_ZBOOT) &&
image->parent_handle != NULL &&
dp != NULL &&
dp->header.type == EFI_DEV_MEDIA &&
dp->header.sub_type == EFI_DEV_MEDIA_VENDOR &&
!efi_guidcmp(dp->vendorguid, LINUX_EFI_ZBOOT_MEDIA_GUID)) {
status = efi_bs_call(handle_protocol, image->parent_handle,
&li_proto, (void *)&image);
if (status != EFI_SUCCESS) {
efi_err("Failed to locate parent image handle\n");
return status;
}
}
status = efi_bs_call(handle_protocol, image->device_handle, &fs_proto,
(void **)&io);
status = efi_bs_call(handle_protocol, efi_table_attr(image, device_handle),
&fs_proto, (void **)&io);
if (status != EFI_SUCCESS) {
efi_err("Failed to handle fs_proto\n");
return status;
}
status = io->open_volume(io, fh);
status = efi_call_proto(io, open_volume, fh);
if (status != EFI_SUCCESS)
efi_err("Failed to open volume\n");
@ -129,16 +119,62 @@ static int find_file_option(const efi_char16_t *cmdline, int cmdline_len,
if (c == L'\0' || c == L'\n' || c == L' ')
break;
else if (c == L'/')
/* Replace UNIX dir separators with EFI standard ones */
*result++ = L'\\';
else
*result++ = c;
}
*result = L'\0';
return i;
}
static efi_status_t efi_open_device_path(efi_file_protocol_t **volume,
struct finfo *fi)
{
efi_guid_t text_to_dp_guid = EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL_GUID;
static efi_device_path_from_text_protocol_t *text_to_dp = NULL;
efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
efi_device_path_protocol_t *initrd_dp;
efi_simple_file_system_protocol_t *io;
struct efi_file_path_dev_path *fpath;
efi_handle_t handle;
efi_status_t status;
/* See if the text to device path protocol exists */
if (!text_to_dp &&
efi_bs_call(locate_protocol, &text_to_dp_guid, NULL,
(void **)&text_to_dp) != EFI_SUCCESS)
return EFI_UNSUPPORTED;
/* Convert the filename wide string into a device path */
initrd_dp = efi_fn_call(text_to_dp, convert_text_to_device_path,
fi->filename);
/* Check whether the device path in question implements simple FS */
if ((efi_bs_call(locate_device_path, &fs_proto, &initrd_dp, &handle) ?:
efi_bs_call(handle_protocol, handle, &fs_proto, (void **)&io))
!= EFI_SUCCESS)
return EFI_NOT_FOUND;
/* Check whether the remaining device path is a file device path */
if (initrd_dp->type != EFI_DEV_MEDIA ||
initrd_dp->sub_type != EFI_DEV_MEDIA_FILE) {
efi_warn("Unexpected device path node type: (%x, %x)\n",
initrd_dp->type, initrd_dp->sub_type);
return EFI_LOAD_ERROR;
}
/* Copy the remaining file path into the fi structure */
fpath = (struct efi_file_path_dev_path *)initrd_dp;
memcpy(fi->filename, fpath->filename,
min(sizeof(fi->filename),
fpath->header.length - sizeof(fpath->header)));
status = efi_call_proto(io, open_volume, volume);
if (status != EFI_SUCCESS)
efi_err("Failed to open volume\n");
return status;
}
/*
* Check the cmdline for a LILO-style file= arguments.
*
@ -153,8 +189,8 @@ efi_status_t handle_cmdline_files(efi_loaded_image_t *image,
unsigned long *load_addr,
unsigned long *load_size)
{
const efi_char16_t *cmdline = image->load_options;
u32 cmdline_len = image->load_options_size;
const efi_char16_t *cmdline = efi_table_attr(image, load_options);
u32 cmdline_len = efi_table_attr(image, load_options_size);
unsigned long efi_chunk_size = ULONG_MAX;
efi_file_protocol_t *volume = NULL;
efi_file_protocol_t *file;
@ -188,11 +224,13 @@ efi_status_t handle_cmdline_files(efi_loaded_image_t *image,
cmdline += offset;
cmdline_len -= offset;
if (!volume) {
status = efi_open_device_path(&volume, &fi);
if (status == EFI_UNSUPPORTED || status == EFI_NOT_FOUND)
/* try the volume that holds the kernel itself */
status = efi_open_volume(image, &volume);
if (status != EFI_SUCCESS)
return status;
}
goto err_free_alloc;
status = efi_open_file(volume, &fi, &file, &size);
if (status != EFI_SUCCESS)
@ -240,7 +278,7 @@ efi_status_t handle_cmdline_files(efi_loaded_image_t *image,
while (size) {
unsigned long chunksize = min(size, efi_chunk_size);
status = file->read(file, &chunksize, addr);
status = efi_call_proto(file, read, &chunksize, addr);
if (status != EFI_SUCCESS) {
efi_err("Failed to read file\n");
goto err_close_file;
@ -248,24 +286,24 @@ efi_status_t handle_cmdline_files(efi_loaded_image_t *image,
addr += chunksize;
size -= chunksize;
}
file->close(file);
efi_call_proto(file, close);
efi_call_proto(volume, close);
} while (offset > 0);
*load_addr = alloc_addr;
*load_size = alloc_size;
if (volume)
volume->close(volume);
if (*load_size == 0)
return EFI_NOT_READY;
return EFI_SUCCESS;
err_close_file:
file->close(file);
efi_call_proto(file, close);
err_close_volume:
volume->close(volume);
efi_call_proto(volume, close);
err_free_alloc:
efi_free(alloc_size, alloc_addr);
return status;
}

18
drivers/firmware/efi/libstub/intrinsics.c
View File

@ -28,3 +28,21 @@ void *memset(void *dst, int c, size_t len)
efi_bs_call(set_mem, dst, len, c & U8_MAX);
return dst;
}
/**
* memcmp - Compare two areas of memory
* @cs: One area of memory
* @ct: Another area of memory
* @count: The size of the area.
*/
#undef memcmp
int memcmp(const void *cs, const void *ct, size_t count)
{
const unsigned char *su1, *su2;
int res = 0;
for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
if ((res = *su1 - *su2) != 0)
break;
return res;
}

91
drivers/firmware/efi/libstub/loongarch-stub.c
View File

@ -9,18 +9,10 @@
#include <asm/addrspace.h>
#include "efistub.h"
typedef void __noreturn (*kernel_entry_t)(bool efi, unsigned long cmdline,
unsigned long systab);
extern int kernel_asize;
extern int kernel_fsize;
extern int kernel_offset;
extern kernel_entry_t kernel_entry;
efi_status_t check_platform_features(void)
{
return EFI_SUCCESS;
}
extern int kernel_entry;
efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
@ -29,74 +21,33 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
efi_loaded_image_t *image,
efi_handle_t image_handle)
{
int nr_pages = round_up(kernel_asize, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
efi_physical_addr_t kernel_addr = EFI_KIMG_PREFERRED_ADDRESS;
efi_status_t status;
unsigned long kernel_addr = 0;
kernel_addr = (unsigned long)&kernel_offset - kernel_offset;
status = efi_relocate_kernel(&kernel_addr, kernel_fsize, kernel_asize,
PHYSADDR(VMLINUX_LOAD_ADDRESS), SZ_2M, 0x0);
*image_addr = kernel_addr;
*image_size = kernel_asize;
return status;
}
struct exit_boot_struct {
efi_memory_desc_t *runtime_map;
int runtime_entry_count;
};
static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
{
struct exit_boot_struct *p = priv;
/*
* Update the memory map with virtual addresses. The function will also
* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
* entries so that we can pass it straight to SetVirtualAddressMap()
* Allocate space for the kernel image at the preferred offset. This is
* the only location in memory from where we can execute the image, so
* no point in falling back to another allocation.
*/
efi_get_virtmap(map->map, map->map_size, map->desc_size,
p->runtime_map, &p->runtime_entry_count);
return EFI_SUCCESS;
}
efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
unsigned long kernel_addr, char *cmdline_ptr)
{
kernel_entry_t real_kernel_entry;
struct exit_boot_struct priv;
unsigned long desc_size;
efi_status_t status;
u32 desc_ver;
status = efi_alloc_virtmap(&priv.runtime_map, &desc_size, &desc_ver);
if (status != EFI_SUCCESS) {
efi_err("Unable to retrieve UEFI memory map.\n");
return status;
}
efi_info("Exiting boot services\n");
efi_novamap = false;
status = efi_exit_boot_services(handle, &priv, exit_boot_func);
status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
EFI_LOADER_DATA, nr_pages, &kernel_addr);
if (status != EFI_SUCCESS)
return status;
/* Install the new virtual address map */
efi_rt_call(set_virtual_address_map,
priv.runtime_entry_count * desc_size, desc_size,
desc_ver, priv.runtime_map);
*image_addr = EFI_KIMG_PREFERRED_ADDRESS;
*image_size = kernel_asize;
/* Config Direct Mapping */
csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
memcpy((void *)EFI_KIMG_PREFERRED_ADDRESS,
(void *)&kernel_offset - kernel_offset,
kernel_fsize);
real_kernel_entry = (kernel_entry_t)
((unsigned long)&kernel_entry - kernel_addr + VMLINUX_LOAD_ADDRESS);
real_kernel_entry(true, (unsigned long)cmdline_ptr,
(unsigned long)efi_system_table);
return status;
}
unsigned long kernel_entry_address(void)
{
unsigned long base = (unsigned long)&kernel_offset - kernel_offset;
return (unsigned long)&kernel_entry - base + VMLINUX_LOAD_ADDRESS;
}

80
drivers/firmware/efi/libstub/loongarch.c Normal file
View File

@ -0,0 +1,80 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Author: Yun Liu <liuyun@loongson.cn>
* Huacai Chen <chenhuacai@loongson.cn>
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <asm/efi.h>
#include <asm/addrspace.h>
#include "efistub.h"
typedef void __noreturn (*kernel_entry_t)(bool efi, unsigned long cmdline,
unsigned long systab);
efi_status_t check_platform_features(void)
{
return EFI_SUCCESS;
}
struct exit_boot_struct {
efi_memory_desc_t *runtime_map;
int runtime_entry_count;
};
static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
{
struct exit_boot_struct *p = priv;
/*
* Update the memory map with virtual addresses. The function will also
* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
* entries so that we can pass it straight to SetVirtualAddressMap()
*/
efi_get_virtmap(map->map, map->map_size, map->desc_size,
p->runtime_map, &p->runtime_entry_count);
return EFI_SUCCESS;
}
unsigned long __weak kernel_entry_address(void)
{
return *(unsigned long *)(PHYSADDR(VMLINUX_LOAD_ADDRESS) + 8);
}
efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
unsigned long kernel_addr, char *cmdline_ptr)
{
kernel_entry_t real_kernel_entry;
struct exit_boot_struct priv;
unsigned long desc_size;
efi_status_t status;
u32 desc_ver;
status = efi_alloc_virtmap(&priv.runtime_map, &desc_size, &desc_ver);
if (status != EFI_SUCCESS) {
efi_err("Unable to retrieve UEFI memory map.\n");
return status;
}
efi_info("Exiting boot services\n");
efi_novamap = false;
status = efi_exit_boot_services(handle, &priv, exit_boot_func);
if (status != EFI_SUCCESS)
return status;
/* Install the new virtual address map */
efi_rt_call(set_virtual_address_map,
priv.runtime_entry_count * desc_size, desc_size,
desc_ver, priv.runtime_map);
/* Config Direct Mapping */
csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
real_kernel_entry = (void *)kernel_entry_address();
real_kernel_entry(true, (unsigned long)cmdline_ptr,
(unsigned long)efi_system_table);
}

5
drivers/firmware/efi/libstub/mem.c
View File

@ -89,9 +89,12 @@ efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr,
efi_physical_addr_t alloc_addr;
efi_status_t status;
max = min(max, EFI_ALLOC_LIMIT);
if (EFI_ALLOC_ALIGN > EFI_PAGE_SIZE)
return efi_allocate_pages_aligned(size, addr, max,
EFI_ALLOC_ALIGN);
EFI_ALLOC_ALIGN,
EFI_LOADER_DATA);
alloc_addr = ALIGN_DOWN(max + 1, EFI_ALLOC_ALIGN) - 1;
status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS,

154
drivers/firmware/efi/libstub/printk.c Normal file
View File

@ -0,0 +1,154 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/stdarg.h>
#include <linux/ctype.h>
#include <linux/efi.h>
#include <linux/kernel.h>
#include <linux/printk.h> /* For CONSOLE_LOGLEVEL_* */
#include <asm/efi.h>
#include <asm/setup.h>
#include "efistub.h"
int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
/**
* efi_char16_puts() - Write a UCS-2 encoded string to the console
* @str: UCS-2 encoded string
*/
void efi_char16_puts(efi_char16_t *str)
{
efi_call_proto(efi_table_attr(efi_system_table, con_out),
output_string, str);
}
static
u32 utf8_to_utf32(const u8 **s8)
{
u32 c32;
u8 c0, cx;
size_t clen, i;
c0 = cx = *(*s8)++;
/*
* The position of the most-significant 0 bit gives us the length of
* a multi-octet encoding.
*/
for (clen = 0; cx & 0x80; ++clen)
cx <<= 1;
/*
* If the 0 bit is in position 8, this is a valid single-octet
* encoding. If the 0 bit is in position 7 or positions 1-3, the
* encoding is invalid.
* In either case, we just return the first octet.
*/
if (clen < 2 || clen > 4)
return c0;
/* Get the bits from the first octet. */
c32 = cx >> clen--;
for (i = 0; i < clen; ++i) {
/* Trailing octets must have 10 in most significant bits. */
cx = (*s8)[i] ^ 0x80;
if (cx & 0xc0)
return c0;
c32 = (c32 << 6) | cx;
}
/*
* Check for validity:
* - The character must be in the Unicode range.
* - It must not be a surrogate.
* - It must be encoded using the correct number of octets.
*/
if (c32 > 0x10ffff ||
(c32 & 0xf800) == 0xd800 ||
clen != (c32 >= 0x80) + (c32 >= 0x800) + (c32 >= 0x10000))
return c0;
*s8 += clen;
return c32;
}
/**
* efi_puts() - Write a UTF-8 encoded string to the console
* @str: UTF-8 encoded string
*/
void efi_puts(const char *str)
{
efi_char16_t buf[128];
size_t pos = 0, lim = ARRAY_SIZE(buf);
const u8 *s8 = (const u8 *)str;
u32 c32;
while (*s8) {
if (*s8 == '\n')
buf[pos++] = L'\r';
c32 = utf8_to_utf32(&s8);
if (c32 < 0x10000) {
/* Characters in plane 0 use a single word. */
buf[pos++] = c32;
} else {
/*
* Characters in other planes encode into a surrogate
* pair.
*/
buf[pos++] = (0xd800 - (0x10000 >> 10)) + (c32 >> 10);
buf[pos++] = 0xdc00 + (c32 & 0x3ff);
}
if (*s8 == '\0' || pos >= lim - 2) {
buf[pos] = L'\0';
efi_char16_puts(buf);
pos = 0;
}
}
}
/**
* efi_printk() - Print a kernel message
* @fmt: format string
*
* The first letter of the format string is used to determine the logging level
* of the message. If the level is less then the current EFI logging level, the
* message is suppressed. The message will be truncated to 255 bytes.
*
* Return: number of printed characters
*/
int efi_printk(const char *fmt, ...)
{
char printf_buf[256];
va_list args;
int printed;
int loglevel = printk_get_level(fmt);
switch (loglevel) {
case '0' ... '9':
loglevel -= '0';
break;
default:
/*
* Use loglevel -1 for cases where we just want to print to
* the screen.
*/
loglevel = -1;
break;
}
if (loglevel >= efi_loglevel)
return 0;
if (loglevel >= 0)
efi_puts("EFI stub: ");
fmt = printk_skip_level(fmt);
va_start(args, fmt);
printed = vsnprintf(printf_buf, sizeof(printf_buf), fmt, args);
va_end(args);
efi_puts(printf_buf);
if (printed >= sizeof(printf_buf)) {
efi_puts("[Message truncated]\n");
return -1;
}
return printed;
}

78
drivers/firmware/efi/libstub/random.c
View File

@ -67,25 +67,50 @@ efi_status_t efi_random_get_seed(void)
efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
efi_guid_t rng_algo_raw = EFI_RNG_ALGORITHM_RAW;
efi_guid_t rng_table_guid = LINUX_EFI_RANDOM_SEED_TABLE_GUID;
struct linux_efi_random_seed *prev_seed, *seed = NULL;
int prev_seed_size = 0, seed_size = EFI_RANDOM_SEED_SIZE;
unsigned long nv_seed_size = 0, offset = 0;
efi_rng_protocol_t *rng = NULL;
struct linux_efi_random_seed *seed = NULL;
efi_status_t status;
status = efi_bs_call(locate_protocol, &rng_proto, NULL, (void **)&rng);
if (status != EFI_SUCCESS)
seed_size = 0;
// Call GetVariable() with a zero length buffer to obtain the size
get_efi_var(L"RandomSeed", &rng_table_guid, NULL, &nv_seed_size, NULL);
if (!seed_size && !nv_seed_size)
return status;
seed_size += nv_seed_size;
/*
* Check whether a seed was provided by a prior boot stage. In that
* case, instead of overwriting it, let's create a new buffer that can
* hold both, and concatenate the existing and the new seeds.
* Note that we should read the seed size with caution, in case the
* table got corrupted in memory somehow.
*/
prev_seed = get_efi_config_table(rng_table_guid);
if (prev_seed && prev_seed->size <= 512U) {
prev_seed_size = prev_seed->size;
seed_size += prev_seed_size;
}
/*
* Use EFI_ACPI_RECLAIM_MEMORY here so that it is guaranteed that the
* allocation will survive a kexec reboot (although we refresh the seed
* beforehand)
*/
status = efi_bs_call(allocate_pool, EFI_ACPI_RECLAIM_MEMORY,
sizeof(*seed) + EFI_RANDOM_SEED_SIZE,
struct_size(seed, bits, seed_size),
(void **)&seed);
if (status != EFI_SUCCESS)
return status;
if (status != EFI_SUCCESS) {
efi_warn("Failed to allocate memory for RNG seed.\n");
goto err_warn;
}
if (rng) {
status = efi_call_proto(rng, get_rng, &rng_algo_raw,
EFI_RANDOM_SEED_SIZE, seed->bits);
@ -97,17 +122,58 @@ efi_status_t efi_random_get_seed(void)
status = efi_call_proto(rng, get_rng, NULL,
EFI_RANDOM_SEED_SIZE, seed->bits);
if (status != EFI_SUCCESS)
if (status == EFI_SUCCESS)
offset = EFI_RANDOM_SEED_SIZE;
}
if (nv_seed_size) {
status = get_efi_var(L"RandomSeed", &rng_table_guid, NULL,
&nv_seed_size, seed->bits + offset);
if (status == EFI_SUCCESS)
/*
* We delete the seed here, and /hope/ that this causes
* EFI to also zero out its representation on disk.
* This is somewhat idealistic, but overwriting the
* variable with zeros is likely just as fraught too.
* TODO: in the future, maybe we can hash it forward
* instead, and write a new seed.
*/
status = set_efi_var(L"RandomSeed", &rng_table_guid, 0,
0, NULL);
if (status == EFI_SUCCESS)
offset += nv_seed_size;
else
memzero_explicit(seed->bits + offset, nv_seed_size);
}
if (!offset)
goto err_freepool;
seed->size = EFI_RANDOM_SEED_SIZE;
if (prev_seed_size) {
memcpy(seed->bits + offset, prev_seed->bits, prev_seed_size);
offset += prev_seed_size;
}
seed->size = offset;
status = efi_bs_call(install_configuration_table, &rng_table_guid, seed);
if (status != EFI_SUCCESS)
goto err_freepool;
if (prev_seed_size) {
/* wipe and free the old seed if we managed to install the new one */
memzero_explicit(prev_seed->bits, prev_seed_size);
efi_bs_call(free_pool, prev_seed);
}
return EFI_SUCCESS;
err_freepool:
memzero_explicit(seed, struct_size(seed, bits, seed_size));
efi_bs_call(free_pool, seed);
efi_warn("Failed to obtain seed from EFI_RNG_PROTOCOL or EFI variable\n");
err_warn:
if (prev_seed)
efi_warn("Retaining bootloader-supplied seed only");
return status;
}

7
drivers/firmware/efi/libstub/randomalloc.c
View File

@ -29,7 +29,7 @@ static unsigned long get_entry_num_slots(efi_memory_desc_t *md,
return 0;
region_end = min(md->phys_addr + md->num_pages * EFI_PAGE_SIZE - 1,
(u64)ULONG_MAX);
(u64)EFI_ALLOC_LIMIT);
if (region_end < size)
return 0;
@ -53,7 +53,8 @@ static unsigned long get_entry_num_slots(efi_memory_desc_t *md,
efi_status_t efi_random_alloc(unsigned long size,
unsigned long align,
unsigned long *addr,
unsigned long random_seed)
unsigned long random_seed,
int memory_type)
{
unsigned long total_slots = 0, target_slot;
unsigned long total_mirrored_slots = 0;
@ -118,7 +119,7 @@ efi_status_t efi_random_alloc(unsigned long size,
pages = size / EFI_PAGE_SIZE;
status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
EFI_LOADER_DATA, pages, &target);
memory_type, pages, &target);
if (status == EFI_SUCCESS)
*addr = target;
break;

96
drivers/firmware/efi/libstub/riscv-stub.c
View File

@ -4,7 +4,6 @@
*/
#include <linux/efi.h>
#include <linux/libfdt.h>
#include <asm/efi.h>
#include <asm/sections.h>
@ -12,92 +11,16 @@
#include "efistub.h"
/*
* RISC-V requires the kernel image to placed 2 MB aligned base for 64 bit and
* 4MB for 32 bit.
*/
#ifdef CONFIG_64BIT
#define MIN_KIMG_ALIGN SZ_2M
#else
#define MIN_KIMG_ALIGN SZ_4M
#endif
typedef void __noreturn (*jump_kernel_func)(unsigned long, unsigned long);
static unsigned long hartid;
static int get_boot_hartid_from_fdt(void)
unsigned long stext_offset(void)
{
const void *fdt;
int chosen_node, len;
const void *prop;
fdt = get_efi_config_table(DEVICE_TREE_GUID);
if (!fdt)
return -EINVAL;
chosen_node = fdt_path_offset(fdt, "/chosen");
if (chosen_node < 0)
return -EINVAL;
prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len);
if (!prop)
return -EINVAL;
if (len == sizeof(u32))
hartid = (unsigned long) fdt32_to_cpu(*(fdt32_t *)prop);
else if (len == sizeof(u64))
hartid = (unsigned long) fdt64_to_cpu(__get_unaligned_t(fdt64_t, prop));
else
return -EINVAL;
return 0;
}
static efi_status_t get_boot_hartid_from_efi(void)
{
efi_guid_t boot_protocol_guid = RISCV_EFI_BOOT_PROTOCOL_GUID;
struct riscv_efi_boot_protocol *boot_protocol;
efi_status_t status;
status = efi_bs_call(locate_protocol, &boot_protocol_guid, NULL,
(void **)&boot_protocol);
if (status != EFI_SUCCESS)
return status;
return efi_call_proto(boot_protocol, get_boot_hartid, &hartid);
}
efi_status_t check_platform_features(void)
{
efi_status_t status;
int ret;
status = get_boot_hartid_from_efi();
if (status != EFI_SUCCESS) {
ret = get_boot_hartid_from_fdt();
if (ret) {
efi_err("Failed to get boot hartid!\n");
return EFI_UNSUPPORTED;
}
}
return EFI_SUCCESS;
}
void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt,
unsigned long fdt_size)
{
unsigned long stext_offset = _start_kernel - _start;
unsigned long kernel_entry = entrypoint + stext_offset;
jump_kernel_func jump_kernel = (jump_kernel_func)kernel_entry;
/*
* Jump to real kernel here with following constraints.
* 1. MMU should be disabled.
* 2. a0 should contain hartid
* 3. a1 should DT address
* When built as part of the kernel, the EFI stub cannot branch to the
* kernel proper via the image header, as the PE/COFF header is
* strictly not part of the in-memory presentation of the image, only
* of the file representation. So instead, we need to jump to the
* actual entrypoint in the .text region of the image.
*/
csr_write(CSR_SATP, 0);
jump_kernel(hartid, fdt);
return _start_kernel - _start;
}
efi_status_t handle_kernel_image(unsigned long *image_addr,
@ -125,9 +48,10 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
* lowest possible memory region as long as the address and size meets
* the alignment constraints.
*/
preferred_addr = MIN_KIMG_ALIGN;
preferred_addr = EFI_KIMG_PREFERRED_ADDRESS;
status = efi_relocate_kernel(image_addr, kernel_size, *image_size,
preferred_addr, MIN_KIMG_ALIGN, 0x0);
preferred_addr, efi_get_kimg_min_align(),
0x0);
if (status != EFI_SUCCESS) {
efi_err("Failed to relocate kernel\n");

98
drivers/firmware/efi/libstub/riscv.c Normal file
View File

@ -0,0 +1,98 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 Western Digital Corporation or its affiliates.
*/
#include <linux/efi.h>
#include <linux/libfdt.h>
#include <asm/efi.h>
#include <asm/unaligned.h>
#include "efistub.h"
typedef void __noreturn (*jump_kernel_func)(unsigned long, unsigned long);
static unsigned long hartid;
static int get_boot_hartid_from_fdt(void)
{
const void *fdt;
int chosen_node, len;
const void *prop;
fdt = get_efi_config_table(DEVICE_TREE_GUID);
if (!fdt)
return -EINVAL;
chosen_node = fdt_path_offset(fdt, "/chosen");
if (chosen_node < 0)
return -EINVAL;
prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len);
if (!prop)
return -EINVAL;
if (len == sizeof(u32))
hartid = (unsigned long) fdt32_to_cpu(*(fdt32_t *)prop);
else if (len == sizeof(u64))
hartid = (unsigned long) fdt64_to_cpu(__get_unaligned_t(fdt64_t, prop));
else
return -EINVAL;
return 0;
}
static efi_status_t get_boot_hartid_from_efi(void)
{
efi_guid_t boot_protocol_guid = RISCV_EFI_BOOT_PROTOCOL_GUID;
struct riscv_efi_boot_protocol *boot_protocol;
efi_status_t status;
status = efi_bs_call(locate_protocol, &boot_protocol_guid, NULL,
(void **)&boot_protocol);
if (status != EFI_SUCCESS)
return status;
return efi_call_proto(boot_protocol, get_boot_hartid, &hartid);
}
efi_status_t check_platform_features(void)
{
efi_status_t status;
int ret;
status = get_boot_hartid_from_efi();
if (status != EFI_SUCCESS) {
ret = get_boot_hartid_from_fdt();
if (ret) {
efi_err("Failed to get boot hartid!\n");
return EFI_UNSUPPORTED;
}
}
return EFI_SUCCESS;
}
unsigned long __weak stext_offset(void)
{
/*
* This fallback definition is used by the EFI zboot stub, which loads
* the entire image so it can branch via the image header at offset #0.
*/
return 0;
}
void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt,
unsigned long fdt_size)
{
unsigned long kernel_entry = entrypoint + stext_offset();
jump_kernel_func jump_kernel = (jump_kernel_func)kernel_entry;
/*
* Jump to real kernel here with following constraints.
* 1. MMU should be disabled.
* 2. a0 should contain hartid
* 3. a1 should DT address
*/
csr_write(CSR_SATP, 0);
jump_kernel(hartid, fdt);
}

56
drivers/firmware/efi/libstub/screen_info.c Normal file
View File

@ -0,0 +1,56 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
/*
* There are two ways of populating the core kernel's struct screen_info via the stub:
* - using a configuration table, like below, which relies on the EFI init code
* to locate the table and copy the contents;
* - by linking directly to the core kernel's copy of the global symbol.
*
* The latter is preferred because it makes the EFIFB earlycon available very
* early, but it only works if the EFI stub is part of the core kernel image
* itself. The zboot decompressor can only use the configuration table
* approach.
*
* In order to support both methods from the same build of the EFI stub
* library, provide this dummy global definition of struct screen_info. If it
* is required to satisfy a link dependency, it means we need to override the
* __weak alloc and free methods with the ones below, and those will be pulled
* in as well.
*/
struct screen_info screen_info;
static efi_guid_t screen_info_guid = LINUX_EFI_SCREEN_INFO_TABLE_GUID;
struct screen_info *alloc_screen_info(void)
{
struct screen_info *si;
efi_status_t status;
status = efi_bs_call(allocate_pool, EFI_ACPI_RECLAIM_MEMORY,
sizeof(*si), (void **)&si);
if (status != EFI_SUCCESS)
return NULL;
status = efi_bs_call(install_configuration_table,
&screen_info_guid, si);
if (status == EFI_SUCCESS)
return si;
efi_bs_call(free_pool, si);
return NULL;
}
void free_screen_info(struct screen_info *si)
{
if (!si)
return;
efi_bs_call(install_configuration_table, &screen_info_guid, NULL);
efi_bs_call(free_pool, si);
}

95
drivers/firmware/efi/libstub/string.c
View File

@ -11,7 +11,37 @@
#include <linux/types.h>
#include <linux/string.h>
#ifndef __HAVE_ARCH_STRSTR
#ifndef EFI_HAVE_STRLEN
/**
* strlen - Find the length of a string
* @s: The string to be sized
*/
size_t strlen(const char *s)
{
const char *sc;
for (sc = s; *sc != '\0'; ++sc)
/* nothing */;
return sc - s;
}
#endif
#ifndef EFI_HAVE_STRNLEN
/**
* strnlen - Find the length of a length-limited string
* @s: The string to be sized
* @count: The maximum number of bytes to search
*/
size_t strnlen(const char *s, size_t count)
{
const char *sc;
for (sc = s; count-- && *sc != '\0'; ++sc)
/* nothing */;
return sc - s;
}
#endif
/**
* strstr - Find the first substring in a %NUL terminated string
* @s1: The string to be searched
@ -33,9 +63,29 @@ char *strstr(const char *s1, const char *s2)
}
return NULL;
}
#ifndef EFI_HAVE_STRCMP
/**
* strcmp - Compare two strings
* @cs: One string
* @ct: Another string
*/
int strcmp(const char *cs, const char *ct)
{
unsigned char c1, c2;
while (1) {
c1 = *cs++;
c2 = *ct++;
if (c1 != c2)
return c1 < c2 ? -1 : 1;
if (!c1)
break;
}
return 0;
}
#endif
#ifndef __HAVE_ARCH_STRNCMP
/**
* strncmp - Compare two length-limited strings
* @cs: One string
@ -57,7 +107,6 @@ int strncmp(const char *cs, const char *ct, size_t count)
}
return 0;
}
#endif
/* Works only for digits and letters, but small and fast */
#define TOLOWER(x) ((x) | 0x20)
@ -113,3 +162,43 @@ long simple_strtol(const char *cp, char **endp, unsigned int base)
return simple_strtoull(cp, endp, base);
}
#ifdef CONFIG_EFI_PARAMS_FROM_FDT
#ifndef EFI_HAVE_STRRCHR
/**
* strrchr - Find the last occurrence of a character in a string
* @s: The string to be searched
* @c: The character to search for
*/
char *strrchr(const char *s, int c)
{
const char *last = NULL;
do {
if (*s == (char)c)
last = s;
} while (*s++);
return (char *)last;
}
#endif
#ifndef EFI_HAVE_MEMCHR
/**
* memchr - Find a character in an area of memory.
* @s: The memory area
* @c: The byte to search for
* @n: The size of the area.
*
* returns the address of the first occurrence of @c, or %NULL
* if @c is not found
*/
void *memchr(const void *s, int c, size_t n)
{
const unsigned char *p = s;
while (n-- != 0) {
if ((unsigned char)c == *p++) {
return (void *)(p - 1);
}
}
return NULL;
}
#endif
#endif

5
drivers/firmware/efi/libstub/zboot-header.S
View File

@ -17,10 +17,11 @@ __efistub_efi_zboot_header:
.long MZ_MAGIC
.ascii "zimg" // image type
.long __efistub__gzdata_start - .Ldoshdr // payload offset
.long __efistub__gzdata_size - ZBOOT_SIZE_LEN // payload size
.long __efistub__gzdata_size - 12 // payload size
.long 0, 0 // reserved
.asciz COMP_TYPE // compression type
.org .Ldoshdr + 0x3c
.org .Ldoshdr + 0x38
.long LINUX_PE_MAGIC
.long .Lpehdr - .Ldoshdr // PE header offset
.Lpehdr:

305
drivers/firmware/efi/libstub/zboot.c
View File

@ -32,271 +32,116 @@ static unsigned long free_mem_ptr, free_mem_end_ptr;
extern char efi_zboot_header[];
extern char _gzdata_start[], _gzdata_end[];
static void log(efi_char16_t str[])
{
efi_call_proto(efi_table_attr(efi_system_table, con_out),
output_string, L"EFI decompressor: ");
efi_call_proto(efi_table_attr(efi_system_table, con_out),
output_string, str);
efi_call_proto(efi_table_attr(efi_system_table, con_out),
output_string, L"\n");
}
static void error(char *x)
{
log(L"error() called from decompressor library\n");
efi_err("EFI decompressor: %s\n", x);
}
// Local version to avoid pulling in memcmp()
static bool guids_eq(const efi_guid_t *a, const efi_guid_t *b)
static unsigned long alloc_preferred_address(unsigned long alloc_size)
{
const u32 *l = (u32 *)a;
const u32 *r = (u32 *)b;
#ifdef EFI_KIMG_PREFERRED_ADDRESS
efi_physical_addr_t efi_addr = EFI_KIMG_PREFERRED_ADDRESS;
return l[0] == r[0] && l[1] == r[1] && l[2] == r[2] && l[3] == r[3];
if (efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
alloc_size / EFI_PAGE_SIZE, &efi_addr) == EFI_SUCCESS)
return efi_addr;
#endif
return ULONG_MAX;
}
static efi_status_t __efiapi
load_file(efi_load_file_protocol_t *this, efi_device_path_protocol_t *rem,
bool boot_policy, unsigned long *bufsize, void *buffer)
void __weak efi_cache_sync_image(unsigned long image_base,
unsigned long alloc_size,
unsigned long code_size)
{
unsigned long compressed_size = _gzdata_end - _gzdata_start;
struct efi_vendor_dev_path *vendor_dp;
bool decompress = false;
unsigned long size;
int ret;
if (rem == NULL || bufsize == NULL)
return EFI_INVALID_PARAMETER;
if (boot_policy)
return EFI_UNSUPPORTED;
// Look for our vendor media device node in the remaining file path
if (rem->type == EFI_DEV_MEDIA &&
rem->sub_type == EFI_DEV_MEDIA_VENDOR) {
vendor_dp = container_of(rem, struct efi_vendor_dev_path, header);
if (!guids_eq(&vendor_dp->vendorguid, &LINUX_EFI_ZBOOT_MEDIA_GUID))
return EFI_NOT_FOUND;
decompress = true;
rem = (void *)(vendor_dp + 1);
}
if (rem->type != EFI_DEV_END_PATH ||
rem->sub_type != EFI_DEV_END_ENTIRE)
return EFI_NOT_FOUND;
// The uncompressed size of the payload is appended to the raw bit
// stream, and may therefore appear misaligned in memory
size = decompress ? get_unaligned_le32(_gzdata_end - 4)
: compressed_size;
if (buffer == NULL || *bufsize < size) {
*bufsize = size;
return EFI_BUFFER_TOO_SMALL;
}
if (decompress) {
ret = __decompress(_gzdata_start, compressed_size, NULL, NULL,
buffer, size, NULL, error);
if (ret < 0) {
log(L"Decompression failed");
return EFI_DEVICE_ERROR;
}
} else {
memcpy(buffer, _gzdata_start, compressed_size);
}
return EFI_SUCCESS;
}
// Return the length in bytes of the device path up to the first end node.
static int device_path_length(const efi_device_path_protocol_t *dp)
{
int len = 0;
while (dp->type != EFI_DEV_END_PATH) {
len += dp->length;
dp = (void *)((u8 *)dp + dp->length);
}
return len;
}
static void append_rel_offset_node(efi_device_path_protocol_t **dp,
unsigned long start, unsigned long end)
{
struct efi_rel_offset_dev_path *rodp = (void *)*dp;
rodp->header.type = EFI_DEV_MEDIA;
rodp->header.sub_type = EFI_DEV_MEDIA_REL_OFFSET;
rodp->header.length = sizeof(struct efi_rel_offset_dev_path);
rodp->reserved = 0;
rodp->starting_offset = start;
rodp->ending_offset = end;
*dp = (void *)(rodp + 1);
}
static void append_ven_media_node(efi_device_path_protocol_t **dp,
efi_guid_t *guid)
{
struct efi_vendor_dev_path *vmdp = (void *)*dp;
vmdp->header.type = EFI_DEV_MEDIA;
vmdp->header.sub_type = EFI_DEV_MEDIA_VENDOR;
vmdp->header.length = sizeof(struct efi_vendor_dev_path);
vmdp->vendorguid = *guid;
*dp = (void *)(vmdp + 1);
}
static void append_end_node(efi_device_path_protocol_t **dp)
{
(*dp)->type = EFI_DEV_END_PATH;
(*dp)->sub_type = EFI_DEV_END_ENTIRE;
(*dp)->length = sizeof(struct efi_generic_dev_path);
++*dp;
// Provided by the arch to perform the cache maintenance necessary for
// executable code loaded into memory to be safe for execution.
}
asmlinkage efi_status_t __efiapi
efi_zboot_entry(efi_handle_t handle, efi_system_table_t *systab)
{
struct efi_mem_mapped_dev_path mmdp = {
.header.type = EFI_DEV_HW,
.header.sub_type = EFI_DEV_MEM_MAPPED,
.header.length = sizeof(struct efi_mem_mapped_dev_path)
};
efi_device_path_protocol_t *parent_dp, *dpp, *lf2_dp, *li_dp;
efi_load_file2_protocol_t zboot_load_file2;
efi_loaded_image_t *parent, *child;
unsigned long exit_data_size;
efi_handle_t child_handle;
efi_handle_t zboot_handle;
efi_char16_t *exit_data;
unsigned long compressed_size = _gzdata_end - _gzdata_start;
unsigned long image_base, alloc_size, code_size;
efi_loaded_image_t *image;
efi_status_t status;
void *dp_alloc;
int dp_len;
char *cmdline_ptr;
int ret;
WRITE_ONCE(efi_system_table, systab);
free_mem_ptr = (unsigned long)&zboot_heap;
free_mem_end_ptr = free_mem_ptr + sizeof(zboot_heap);
exit_data = NULL;
exit_data_size = 0;
status = efi_bs_call(handle_protocol, handle,
&LOADED_IMAGE_PROTOCOL_GUID, (void **)&parent);
&LOADED_IMAGE_PROTOCOL_GUID, (void **)&image);
if (status != EFI_SUCCESS) {
log(L"Failed to locate parent's loaded image protocol");
error("Failed to locate parent's loaded image protocol");
return status;
}
status = efi_bs_call(handle_protocol, handle,
&LOADED_IMAGE_DEVICE_PATH_PROTOCOL_GUID,
(void **)&parent_dp);
if (status != EFI_SUCCESS || parent_dp == NULL) {
// Create a MemoryMapped() device path node to describe
// the parent image if no device path was provided.
mmdp.memory_type = parent->image_code_type;
mmdp.starting_addr = (unsigned long)parent->image_base;
mmdp.ending_addr = (unsigned long)parent->image_base +
parent->image_size - 1;
parent_dp = &mmdp.header;
dp_len = sizeof(mmdp);
status = efi_handle_cmdline(image, &cmdline_ptr);
if (status != EFI_SUCCESS)
return status;
efi_info("Decompressing Linux Kernel...\n");
// SizeOfImage from the compressee's PE/COFF header
alloc_size = round_up(get_unaligned_le32(_gzdata_end - 4),
EFI_ALLOC_ALIGN);
// SizeOfHeaders and SizeOfCode from the compressee's PE/COFF header
code_size = get_unaligned_le32(_gzdata_end - 8) +
get_unaligned_le32(_gzdata_end - 12);
// If the architecture has a preferred address for the image,
// try that first.
image_base = alloc_preferred_address(alloc_size);
if (image_base == ULONG_MAX) {
unsigned long min_kimg_align = efi_get_kimg_min_align();
u32 seed = U32_MAX;
if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
// Setting the random seed to 0x0 is the same as
// allocating as low as possible
seed = 0;
} else if (efi_nokaslr) {
efi_info("KASLR disabled on kernel command line\n");
} else {
dp_len = device_path_length(parent_dp);
status = efi_get_random_bytes(sizeof(seed), (u8 *)&seed);
if (status == EFI_NOT_FOUND) {
efi_info("EFI_RNG_PROTOCOL unavailable\n");
efi_nokaslr = true;
} else if (status != EFI_SUCCESS) {
efi_err("efi_get_random_bytes() failed (0x%lx)\n",
status);
efi_nokaslr = true;
}
}
// Allocate some pool memory for device path protocol data
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
2 * (dp_len + sizeof(struct efi_rel_offset_dev_path) +
sizeof(struct efi_generic_dev_path)) +
sizeof(struct efi_vendor_dev_path),
(void **)&dp_alloc);
status = efi_random_alloc(alloc_size, min_kimg_align, &image_base,
seed, EFI_LOADER_CODE);
if (status != EFI_SUCCESS) {
log(L"Failed to allocate device path pool memory");
return status;
efi_err("Failed to allocate memory\n");
goto free_cmdline;
}
}
// Create a device path describing the compressed payload in this image
// <...parent_dp...>/Offset(<start>, <end>)
lf2_dp = memcpy(dp_alloc, parent_dp, dp_len);
dpp = (void *)((u8 *)lf2_dp + dp_len);
append_rel_offset_node(&dpp,
(unsigned long)(_gzdata_start - efi_zboot_header),
(unsigned long)(_gzdata_end - efi_zboot_header - 1));
append_end_node(&dpp);
// Create a device path describing the decompressed payload in this image
// <...parent_dp...>/Offset(<start>, <end>)/VenMedia(ZBOOT_MEDIA_GUID)
dp_len += sizeof(struct efi_rel_offset_dev_path);
li_dp = memcpy(dpp, lf2_dp, dp_len);
dpp = (void *)((u8 *)li_dp + dp_len);
append_ven_media_node(&dpp, &LINUX_EFI_ZBOOT_MEDIA_GUID);
append_end_node(&dpp);
zboot_handle = NULL;
zboot_load_file2.load_file = load_file;
status = efi_bs_call(install_multiple_protocol_interfaces,
&zboot_handle,
&EFI_DEVICE_PATH_PROTOCOL_GUID, lf2_dp,
&EFI_LOAD_FILE2_PROTOCOL_GUID, &zboot_load_file2,
NULL);
if (status != EFI_SUCCESS) {
log(L"Failed to install LoadFile2 protocol and device path");
goto free_dpalloc;
// Decompress the payload into the newly allocated buffer.
ret = __decompress(_gzdata_start, compressed_size, NULL, NULL,
(void *)image_base, alloc_size, NULL, error);
if (ret < 0) {
error("Decompression failed");
status = EFI_DEVICE_ERROR;
goto free_image;
}
status = efi_bs_call(load_image, false, handle, li_dp, NULL, 0,
&child_handle);
if (status != EFI_SUCCESS) {
log(L"Failed to load image");
goto uninstall_lf2;
}
efi_cache_sync_image(image_base, alloc_size, code_size);
status = efi_bs_call(handle_protocol, child_handle,
&LOADED_IMAGE_PROTOCOL_GUID, (void **)&child);
if (status != EFI_SUCCESS) {
log(L"Failed to locate child's loaded image protocol");
goto unload_image;
}
status = efi_stub_common(handle, image, image_base, cmdline_ptr);
// Copy the kernel command line
child->load_options = parent->load_options;
child->load_options_size = parent->load_options_size;
status = efi_bs_call(start_image, child_handle, &exit_data_size,
&exit_data);
if (status != EFI_SUCCESS) {
log(L"StartImage() returned with error");
if (exit_data_size > 0)
log(exit_data);
// If StartImage() returns EFI_SECURITY_VIOLATION, the image is
// not unloaded so we need to do it by hand.
if (status == EFI_SECURITY_VIOLATION)
unload_image:
efi_bs_call(unload_image, child_handle);
}
uninstall_lf2:
efi_bs_call(uninstall_multiple_protocol_interfaces,
zboot_handle,
&EFI_DEVICE_PATH_PROTOCOL_GUID, lf2_dp,
&EFI_LOAD_FILE2_PROTOCOL_GUID, &zboot_load_file2,
NULL);
free_dpalloc:
efi_bs_call(free_pool, dp_alloc);
efi_bs_call(exit, handle, status, exit_data_size, exit_data);
// Free ExitData in case Exit() returned with a failure code,
// but return the original status code.
log(L"Exit() returned with failure code");
if (exit_data != NULL)
efi_bs_call(free_pool, exit_data);
free_image:
efi_free(alloc_size, image_base);
free_cmdline:
efi_bs_call(free_pool, cmdline_ptr);
return status;
}

243
drivers/firmware/efi/memmap.c
View File

@ -9,82 +9,15 @@
#include <linux/kernel.h>
#include <linux/efi.h>
#include <linux/io.h>
#include <asm/early_ioremap.h>
#include <linux/memblock.h>
#include <linux/slab.h>
static phys_addr_t __init __efi_memmap_alloc_early(unsigned long size)
{
return memblock_phys_alloc(size, SMP_CACHE_BYTES);
}
#include <asm/early_ioremap.h>
#include <asm/efi.h>
static phys_addr_t __init __efi_memmap_alloc_late(unsigned long size)
{
unsigned int order = get_order(size);
struct page *p = alloc_pages(GFP_KERNEL, order);
if (!p)
return 0;
return PFN_PHYS(page_to_pfn(p));
}
void __init __efi_memmap_free(u64 phys, unsigned long size, unsigned long flags)
{
if (flags & EFI_MEMMAP_MEMBLOCK) {
if (slab_is_available())
memblock_free_late(phys, size);
else
memblock_phys_free(phys, size);
} else if (flags & EFI_MEMMAP_SLAB) {
struct page *p = pfn_to_page(PHYS_PFN(phys));
unsigned int order = get_order(size);
free_pages((unsigned long) page_address(p), order);
}
}
static void __init efi_memmap_free(void)
{
__efi_memmap_free(efi.memmap.phys_map,
efi.memmap.desc_size * efi.memmap.nr_map,
efi.memmap.flags);
}
/**
* efi_memmap_alloc - Allocate memory for the EFI memory map
* @num_entries: Number of entries in the allocated map.
* @data: efi memmap installation parameters
*
* Depending on whether mm_init() has already been invoked or not,
* either memblock or "normal" page allocation is used.
*
* Returns zero on success, a negative error code on failure.
*/
int __init efi_memmap_alloc(unsigned int num_entries,
struct efi_memory_map_data *data)
{
/* Expect allocation parameters are zero initialized */
WARN_ON(data->phys_map || data->size);
data->size = num_entries * efi.memmap.desc_size;
data->desc_version = efi.memmap.desc_version;
data->desc_size = efi.memmap.desc_size;
data->flags &= ~(EFI_MEMMAP_SLAB | EFI_MEMMAP_MEMBLOCK);
data->flags |= efi.memmap.flags & EFI_MEMMAP_LATE;
if (slab_is_available()) {
data->flags |= EFI_MEMMAP_SLAB;
data->phys_map = __efi_memmap_alloc_late(data->size);
} else {
data->flags |= EFI_MEMMAP_MEMBLOCK;
data->phys_map = __efi_memmap_alloc_early(data->size);
}
if (!data->phys_map)
return -ENOMEM;
return 0;
}
#ifndef __efi_memmap_free
#define __efi_memmap_free(phys, size, flags) do { } while (0)
#endif
/**
* __efi_memmap_init - Common code for mapping the EFI memory map
@ -101,14 +34,11 @@ int __init efi_memmap_alloc(unsigned int num_entries,
*
* Returns zero on success, a negative error code on failure.
*/
static int __init __efi_memmap_init(struct efi_memory_map_data *data)
int __init __efi_memmap_init(struct efi_memory_map_data *data)
{
struct efi_memory_map map;
phys_addr_t phys_map;
if (efi_enabled(EFI_PARAVIRT))
return 0;
phys_map = data->phys_map;
if (data->flags & EFI_MEMMAP_LATE)
@ -121,8 +51,10 @@ static int __init __efi_memmap_init(struct efi_memory_map_data *data)
return -ENOMEM;
}
/* NOP if data->flags & (EFI_MEMMAP_MEMBLOCK | EFI_MEMMAP_SLAB) == 0 */
efi_memmap_free();
if (efi.memmap.flags & (EFI_MEMMAP_MEMBLOCK | EFI_MEMMAP_SLAB))
__efi_memmap_free(efi.memmap.phys_map,
efi.memmap.desc_size * efi.memmap.nr_map,
efi.memmap.flags);
map.phys_map = data->phys_map;
map.nr_map = data->size / data->desc_size;
@ -220,158 +152,3 @@ int __init efi_memmap_init_late(phys_addr_t addr, unsigned long size)
return __efi_memmap_init(&data);
}
/**
* efi_memmap_install - Install a new EFI memory map in efi.memmap
* @ctx: map allocation parameters (address, size, flags)
*
* Unlike efi_memmap_init_*(), this function does not allow the caller
* to switch from early to late mappings. It simply uses the existing
* mapping function and installs the new memmap.
*
* Returns zero on success, a negative error code on failure.
*/
int __init efi_memmap_install(struct efi_memory_map_data *data)
{
efi_memmap_unmap();
return __efi_memmap_init(data);
}
/**
* efi_memmap_split_count - Count number of additional EFI memmap entries
* @md: EFI memory descriptor to split
* @range: Address range (start, end) to split around
*
* Returns the number of additional EFI memmap entries required to
* accommodate @range.
*/
int __init efi_memmap_split_count(efi_memory_desc_t *md, struct range *range)
{
u64 m_start, m_end;
u64 start, end;
int count = 0;
start = md->phys_addr;
end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1;
/* modifying range */
m_start = range->start;
m_end = range->end;
if (m_start <= start) {
/* split into 2 parts */
if (start < m_end && m_end < end)
count++;
}
if (start < m_start && m_start < end) {
/* split into 3 parts */
if (m_end < end)
count += 2;
/* split into 2 parts */
if (end <= m_end)
count++;
}
return count;
}
/**
* efi_memmap_insert - Insert a memory region in an EFI memmap
* @old_memmap: The existing EFI memory map structure
* @buf: Address of buffer to store new map
* @mem: Memory map entry to insert
*
* It is suggested that you call efi_memmap_split_count() first
* to see how large @buf needs to be.
*/
void __init efi_memmap_insert(struct efi_memory_map *old_memmap, void *buf,
struct efi_mem_range *mem)
{
u64 m_start, m_end, m_attr;
efi_memory_desc_t *md;
u64 start, end;
void *old, *new;
/* modifying range */
m_start = mem->range.start;
m_end = mem->range.end;
m_attr = mem->attribute;
/*
* The EFI memory map deals with regions in EFI_PAGE_SIZE
* units. Ensure that the region described by 'mem' is aligned
* correctly.
*/
if (!IS_ALIGNED(m_start, EFI_PAGE_SIZE) ||
!IS_ALIGNED(m_end + 1, EFI_PAGE_SIZE)) {
WARN_ON(1);
return;
}
for (old = old_memmap->map, new = buf;
old < old_memmap->map_end;
old += old_memmap->desc_size, new += old_memmap->desc_size) {
/* copy original EFI memory descriptor */
memcpy(new, old, old_memmap->desc_size);
md = new;
start = md->phys_addr;
end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
if (m_start <= start && end <= m_end)
md->attribute |= m_attr;
if (m_start <= start &&
(start < m_end && m_end < end)) {
/* first part */
md->attribute |= m_attr;
md->num_pages = (m_end - md->phys_addr + 1) >>
EFI_PAGE_SHIFT;
/* latter part */
new += old_memmap->desc_size;
memcpy(new, old, old_memmap->desc_size);
md = new;
md->phys_addr = m_end + 1;
md->num_pages = (end - md->phys_addr + 1) >>
EFI_PAGE_SHIFT;
}
if ((start < m_start && m_start < end) && m_end < end) {
/* first part */
md->num_pages = (m_start - md->phys_addr) >>
EFI_PAGE_SHIFT;
/* middle part */
new += old_memmap->desc_size;
memcpy(new, old, old_memmap->desc_size);
md = new;
md->attribute |= m_attr;
md->phys_addr = m_start;
md->num_pages = (m_end - m_start + 1) >>
EFI_PAGE_SHIFT;
/* last part */
new += old_memmap->desc_size;
memcpy(new, old, old_memmap->desc_size);
md = new;
md->phys_addr = m_end + 1;
md->num_pages = (end - m_end) >>
EFI_PAGE_SHIFT;
}
if ((start < m_start && m_start < end) &&
(end <= m_end)) {
/* first part */
md->num_pages = (m_start - md->phys_addr) >>
EFI_PAGE_SHIFT;
/* latter part */
new += old_memmap->desc_size;
memcpy(new, old, old_memmap->desc_size);
md = new;
md->phys_addr = m_start;
md->num_pages = (end - md->phys_addr + 1) >>
EFI_PAGE_SHIFT;
md->attribute |= m_attr;
}
}
}

1
drivers/firmware/efi/runtime-wrappers.c
View File

@ -83,6 +83,7 @@ struct efi_runtime_work efi_rts_work;
else \
pr_err("Failed to queue work to efi_rts_wq.\n"); \
\
WARN_ON_ONCE(efi_rts_work.status == EFI_ABORTED); \
exit: \
efi_rts_work.efi_rts_id = EFI_NONE; \
efi_rts_work.status; \

75
drivers/firmware/efi/x86_fake_mem.c
View File

@ -1,75 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2019 Intel Corporation. All rights reserved. */
#include <linux/efi.h>
#include <asm/e820/api.h>
#include "fake_mem.h"
void __init efi_fake_memmap_early(void)
{
int i;
/*
* The late efi_fake_mem() call can handle all requests if
* EFI_MEMORY_SP support is disabled.
*/
if (!efi_soft_reserve_enabled())
return;
if (!efi_enabled(EFI_MEMMAP) || !nr_fake_mem)
return;
/*
* Given that efi_fake_memmap() needs to perform memblock
* allocations it needs to run after e820__memblock_setup().
* However, if efi_fake_mem specifies EFI_MEMORY_SP for a given
* address range that potentially needs to mark the memory as
* reserved prior to e820__memblock_setup(). Update e820
* directly if EFI_MEMORY_SP is specified for an
* EFI_CONVENTIONAL_MEMORY descriptor.
*/
for (i = 0; i < nr_fake_mem; i++) {
struct efi_mem_range *mem = &efi_fake_mems[i];
efi_memory_desc_t *md;
u64 m_start, m_end;
if ((mem->attribute & EFI_MEMORY_SP) == 0)
continue;
m_start = mem->range.start;
m_end = mem->range.end;
for_each_efi_memory_desc(md) {
u64 start, end, size;
if (md->type != EFI_CONVENTIONAL_MEMORY)
continue;
start = md->phys_addr;
end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
if (m_start <= end && m_end >= start)
/* fake range overlaps descriptor */;
else
continue;
/*
* Trim the boundary of the e820 update to the
* descriptor in case the fake range overlaps
* !EFI_CONVENTIONAL_MEMORY
*/
start = max(start, m_start);
end = min(end, m_end);
size = end - start + 1;
if (end <= start)
continue;
/*
* Ensure each efi_fake_mem instance results in
* a unique e820 resource
*/
e820__range_remove(start, size, E820_TYPE_RAM, 1);
e820__range_add(start, size, E820_TYPE_SOFT_RESERVED);
e820__update_table(e820_table);
}
}
}

4
fs/efivarfs/inode.c
View File

@ -91,6 +91,10 @@ static int efivarfs_create(struct user_namespace *mnt_userns, struct inode *dir,
err = guid_parse(dentry->d_name.name + namelen + 1, &var->var.VendorGuid);
if (err)
goto out;
if (guid_equal(&var->var.VendorGuid, &LINUX_EFI_RANDOM_SEED_TABLE_GUID)) {
err = -EPERM;
goto out;
}
if (efivar_variable_is_removable(var->var.VendorGuid,
dentry->d_name.name, namelen))

3
fs/efivarfs/super.c
View File

@ -116,6 +116,9 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
int err = -ENOMEM;
bool is_removable = false;
if (guid_equal(&vendor, &LINUX_EFI_RANDOM_SEED_TABLE_GUID))
return 0;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return err;

22
include/linux/cxl_err.h Normal file
View File

@ -0,0 +1,22 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2022 Advanced Micro Devices, Inc.
*
* Author: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
*/
#ifndef LINUX_CXL_ERR_H
#define LINUX_CXL_ERR_H
/* CXL RAS Capability Structure, CXL v3.1 sec 8.2.4.16 */
struct cxl_ras_capability_regs {
u32 uncor_status;
u32 uncor_mask;
u32 uncor_severity;
u32 cor_status;
u32 cor_mask;
u32 cap_control;
u32 header_log[16];
};
#endif //__CXL_ERR_

55
include/linux/efi.h
View File

@ -371,6 +371,7 @@ void efi_native_runtime_setup(void);
#define LOADED_IMAGE_DEVICE_PATH_PROTOCOL_GUID EFI_GUID(0xbc62157e, 0x3e33, 0x4fec, 0x99, 0x20, 0x2d, 0x3b, 0x36, 0xd7, 0x50, 0xdf)
#define EFI_DEVICE_PATH_PROTOCOL_GUID EFI_GUID(0x09576e91, 0x6d3f, 0x11d2, 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b)
#define EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID EFI_GUID(0x8b843e20, 0x8132, 0x4852, 0x90, 0xcc, 0x55, 0x1a, 0x4e, 0x4a, 0x7f, 0x1c)
#define EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL_GUID EFI_GUID(0x05c99a21, 0xc70f, 0x4ad2, 0x8a, 0x5f, 0x35, 0xdf, 0x33, 0x43, 0xf5, 0x1e)
#define EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID EFI_GUID(0x9042a9de, 0x23dc, 0x4a38, 0x96, 0xfb, 0x7a, 0xde, 0xd0, 0x80, 0x51, 0x6a)
#define EFI_UGA_PROTOCOL_GUID EFI_GUID(0x982c298b, 0xf4fa, 0x41cb, 0xb8, 0x38, 0x77, 0xaa, 0x68, 0x8f, 0xb8, 0x39)
#define EFI_PCI_IO_PROTOCOL_GUID EFI_GUID(0x4cf5b200, 0x68b8, 0x4ca5, 0x9e, 0xec, 0xb2, 0x3e, 0x3f, 0x50, 0x02, 0x9a)
@ -404,7 +405,7 @@ void efi_native_runtime_setup(void);
* structure that was populated by the stub based on the GOP protocol instance
* associated with ConOut
*/
#define LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID EFI_GUID(0xe03fc20a, 0x85dc, 0x406e, 0xb9, 0x0e, 0x4a, 0xb5, 0x02, 0x37, 0x1d, 0x95)
#define LINUX_EFI_SCREEN_INFO_TABLE_GUID EFI_GUID(0xe03fc20a, 0x85dc, 0x406e, 0xb9, 0x0e, 0x4a, 0xb5, 0x02, 0x37, 0x1d, 0x95)
#define LINUX_EFI_ARM_CPU_STATE_TABLE_GUID EFI_GUID(0xef79e4aa, 0x3c3d, 0x4989, 0xb9, 0x02, 0x07, 0xa9, 0x43, 0xe5, 0x50, 0xd2)
#define LINUX_EFI_LOADER_ENTRY_GUID EFI_GUID(0x4a67b082, 0x0a4c, 0x41cf, 0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f)
#define LINUX_EFI_RANDOM_SEED_TABLE_GUID EFI_GUID(0x1ce1e5bc, 0x7ceb, 0x42f2, 0x81, 0xe5, 0x8a, 0xad, 0xf1, 0x80, 0xf5, 0x7b)
@ -412,7 +413,6 @@ void efi_native_runtime_setup(void);
#define LINUX_EFI_TPM_FINAL_LOG_GUID EFI_GUID(0x1e2ed096, 0x30e2, 0x4254, 0xbd, 0x89, 0x86, 0x3b, 0xbe, 0xf8, 0x23, 0x25)
#define LINUX_EFI_MEMRESERVE_TABLE_GUID EFI_GUID(0x888eb0c6, 0x8ede, 0x4ff5, 0xa8, 0xf0, 0x9a, 0xee, 0x5c, 0xb9, 0x77, 0xc2)
#define LINUX_EFI_INITRD_MEDIA_GUID EFI_GUID(0x5568e427, 0x68fc, 0x4f3d, 0xac, 0x74, 0xca, 0x55, 0x52, 0x31, 0xcc, 0x68)
#define LINUX_EFI_ZBOOT_MEDIA_GUID EFI_GUID(0xe565a30d, 0x47da, 0x4dbd, 0xb3, 0x54, 0x9b, 0xb5, 0xc8, 0x4f, 0x8b, 0xe2)
#define LINUX_EFI_MOK_VARIABLE_TABLE_GUID EFI_GUID(0xc451ed2b, 0x9694, 0x45d3, 0xba, 0xba, 0xed, 0x9f, 0x89, 0x88, 0xa3, 0x89)
#define LINUX_EFI_COCO_SECRET_AREA_GUID EFI_GUID(0xadf956ad, 0xe98c, 0x484c, 0xae, 0x11, 0xb5, 0x1c, 0x7d, 0x33, 0x64, 0x47)
#define LINUX_EFI_BOOT_MEMMAP_GUID EFI_GUID(0x800f683f, 0xd08b, 0x423a, 0xa2, 0x93, 0x96, 0x5c, 0x3c, 0x6f, 0xe2, 0xb4)
@ -707,18 +707,10 @@ static inline efi_status_t efi_query_variable_store(u32 attributes,
#endif
extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr);
extern int __init efi_memmap_alloc(unsigned int num_entries,
struct efi_memory_map_data *data);
extern void __efi_memmap_free(u64 phys, unsigned long size,
unsigned long flags);
extern int __init __efi_memmap_init(struct efi_memory_map_data *data);
extern int __init efi_memmap_init_early(struct efi_memory_map_data *data);
extern int __init efi_memmap_init_late(phys_addr_t addr, unsigned long size);
extern void __init efi_memmap_unmap(void);
extern int __init efi_memmap_install(struct efi_memory_map_data *data);
extern int __init efi_memmap_split_count(efi_memory_desc_t *md,
struct range *range);
extern void __init efi_memmap_insert(struct efi_memory_map *old_memmap,
void *buf, struct efi_mem_range *mem);
#ifdef CONFIG_EFI_ESRT
extern void __init efi_esrt_init(void);
@ -749,12 +741,6 @@ extern struct kobject *efi_kobj;
extern int efi_reboot_quirk_mode;
extern bool efi_poweroff_required(void);
#ifdef CONFIG_EFI_FAKE_MEMMAP
extern void __init efi_fake_memmap(void);
#else
static inline void efi_fake_memmap(void) { }
#endif
extern unsigned long efi_mem_attr_table;
/*
@ -1012,6 +998,11 @@ struct efi_mem_mapped_dev_path {
u64 ending_addr;
} __packed;
struct efi_file_path_dev_path {
struct efi_generic_dev_path header;
efi_char16_t filename[];
} __packed;
struct efi_dev_path {
union {
struct efi_generic_dev_path header;
@ -1098,34 +1089,6 @@ extern int efi_capsule_update(efi_capsule_header_t *capsule,
static inline bool efi_capsule_pending(int *reset_type) { return false; }
#endif
#ifdef CONFIG_EFI_RUNTIME_MAP
int efi_runtime_map_init(struct kobject *);
int efi_get_runtime_map_size(void);
int efi_get_runtime_map_desc_size(void);
int efi_runtime_map_copy(void *buf, size_t bufsz);
#else
static inline int efi_runtime_map_init(struct kobject *kobj)
{
return 0;
}
static inline int efi_get_runtime_map_size(void)
{
return 0;
}
static inline int efi_get_runtime_map_desc_size(void)
{
return 0;
}
static inline int efi_runtime_map_copy(void *buf, size_t bufsz)
{
return 0;
}
#endif
#ifdef CONFIG_EFI
extern bool efi_runtime_disabled(void);
#else
@ -1170,8 +1133,6 @@ void efi_check_for_embedded_firmwares(void);
static inline void efi_check_for_embedded_firmwares(void) { }
#endif
efi_status_t efi_random_get_seed(void);
#define arch_efi_call_virt(p, f, args...) ((p)->f(args))
/*

9
include/linux/pe.h
View File

@ -29,7 +29,14 @@
* handover_offset and xloadflags fields in the bootparams structure.
*/
#define LINUX_EFISTUB_MAJOR_VERSION 0x1
#define LINUX_EFISTUB_MINOR_VERSION 0x0
#define LINUX_EFISTUB_MINOR_VERSION 0x1
/*
* LINUX_PE_MAGIC appears at offset 0x38 into the MS-DOS header of EFI bootable
* Linux kernel images that target the architecture as specified by the PE/COFF
* header machine type field.
*/
#define LINUX_PE_MAGIC 0x818223cd
#define MZ_MAGIC 0x5a4d /* "MZ" */