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efi/loongarch: libstub: Split off kernel image relocation for builtin stub 

The LoongArch build of the EFI stub is part of the core kernel image, and
therefore accesses section markers directly when it needs to figure out
the size of the various section.

The zboot decompressor does not have access to those symbols, but
doesn't really need that either. So let's move handle_kernel_image()
into a separate file (or rather, move everything else into a separate
file) so that the zboot build does not pull in unused code that links to
symbols that it does not define.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-10-13 12:39:37 +02:00
parent 0efb61c89f
commit d729b554e1
3 changed files with 82 additions and 67 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/firmware/efi/libstub/Makefile
View File

@ -89,7 +89,7 @@ lib-$(CONFIG_ARM) += arm32-stub.o
lib-$(CONFIG_ARM64) += arm64.o arm64-stub.o arm64-entry.o
lib-$(CONFIG_X86) += x86-stub.o
lib-$(CONFIG_RISCV) += riscv.o riscv-stub.o
lib-$(CONFIG_LOONGARCH) += loongarch-stub.o
lib-$(CONFIG_LOONGARCH) += loongarch.o loongarch-stub.o
CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)

67
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,
@ -53,66 +45,9 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
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()
*/
efi_get_virtmap(map->map, map->map_size, map->desc_size,
p->runtime_map, &p->runtime_entry_count);
return EFI_SUCCESS;
}
unsigned long kernel_entry_address(void)
{
unsigned long base = (unsigned long)&kernel_offset - kernel_offset;
return (unsigned long)&kernel_entry - base + VMLINUX_LOAD_ADDRESS;
}
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);
}

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);
}