356 lines
10 KiB
C
356 lines
10 KiB
C
/*
|
|
* EFI stub implementation that is shared by arm and arm64 architectures.
|
|
* This should be #included by the EFI stub implementation files.
|
|
*
|
|
* Copyright (C) 2013,2014 Linaro Limited
|
|
* Roy Franz <roy.franz@linaro.org
|
|
* Copyright (C) 2013 Red Hat, Inc.
|
|
* Mark Salter <msalter@redhat.com>
|
|
*
|
|
* This file is part of the Linux kernel, and is made available under the
|
|
* terms of the GNU General Public License version 2.
|
|
*
|
|
*/
|
|
|
|
#include <linux/efi.h>
|
|
#include <asm/efi.h>
|
|
|
|
#include "efistub.h"
|
|
|
|
static int efi_secureboot_enabled(efi_system_table_t *sys_table_arg)
|
|
{
|
|
static efi_guid_t const var_guid = EFI_GLOBAL_VARIABLE_GUID;
|
|
static efi_char16_t const var_name[] = {
|
|
'S', 'e', 'c', 'u', 'r', 'e', 'B', 'o', 'o', 't', 0 };
|
|
|
|
efi_get_variable_t *f_getvar = sys_table_arg->runtime->get_variable;
|
|
unsigned long size = sizeof(u8);
|
|
efi_status_t status;
|
|
u8 val;
|
|
|
|
status = f_getvar((efi_char16_t *)var_name, (efi_guid_t *)&var_guid,
|
|
NULL, &size, &val);
|
|
|
|
switch (status) {
|
|
case EFI_SUCCESS:
|
|
return val;
|
|
case EFI_NOT_FOUND:
|
|
return 0;
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
efi_status_t efi_open_volume(efi_system_table_t *sys_table_arg,
|
|
void *__image, void **__fh)
|
|
{
|
|
efi_file_io_interface_t *io;
|
|
efi_loaded_image_t *image = __image;
|
|
efi_file_handle_t *fh;
|
|
efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
|
|
efi_status_t status;
|
|
void *handle = (void *)(unsigned long)image->device_handle;
|
|
|
|
status = sys_table_arg->boottime->handle_protocol(handle,
|
|
&fs_proto, (void **)&io);
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
|
|
return status;
|
|
}
|
|
|
|
status = io->open_volume(io, &fh);
|
|
if (status != EFI_SUCCESS)
|
|
efi_printk(sys_table_arg, "Failed to open volume\n");
|
|
|
|
*__fh = fh;
|
|
return status;
|
|
}
|
|
|
|
efi_status_t efi_file_close(void *handle)
|
|
{
|
|
efi_file_handle_t *fh = handle;
|
|
|
|
return fh->close(handle);
|
|
}
|
|
|
|
efi_status_t
|
|
efi_file_read(void *handle, unsigned long *size, void *addr)
|
|
{
|
|
efi_file_handle_t *fh = handle;
|
|
|
|
return fh->read(handle, size, addr);
|
|
}
|
|
|
|
|
|
efi_status_t
|
|
efi_file_size(efi_system_table_t *sys_table_arg, void *__fh,
|
|
efi_char16_t *filename_16, void **handle, u64 *file_sz)
|
|
{
|
|
efi_file_handle_t *h, *fh = __fh;
|
|
efi_file_info_t *info;
|
|
efi_status_t status;
|
|
efi_guid_t info_guid = EFI_FILE_INFO_ID;
|
|
unsigned long info_sz;
|
|
|
|
status = fh->open(fh, &h, filename_16, EFI_FILE_MODE_READ, (u64)0);
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to open file: ");
|
|
efi_char16_printk(sys_table_arg, filename_16);
|
|
efi_printk(sys_table_arg, "\n");
|
|
return status;
|
|
}
|
|
|
|
*handle = h;
|
|
|
|
info_sz = 0;
|
|
status = h->get_info(h, &info_guid, &info_sz, NULL);
|
|
if (status != EFI_BUFFER_TOO_SMALL) {
|
|
efi_printk(sys_table_arg, "Failed to get file info size\n");
|
|
return status;
|
|
}
|
|
|
|
grow:
|
|
status = sys_table_arg->boottime->allocate_pool(EFI_LOADER_DATA,
|
|
info_sz, (void **)&info);
|
|
if (status != EFI_SUCCESS) {
|
|
efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
|
|
return status;
|
|
}
|
|
|
|
status = h->get_info(h, &info_guid, &info_sz,
|
|
info);
|
|
if (status == EFI_BUFFER_TOO_SMALL) {
|
|
sys_table_arg->boottime->free_pool(info);
|
|
goto grow;
|
|
}
|
|
|
|
*file_sz = info->file_size;
|
|
sys_table_arg->boottime->free_pool(info);
|
|
|
|
if (status != EFI_SUCCESS)
|
|
efi_printk(sys_table_arg, "Failed to get initrd info\n");
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
|
|
void efi_char16_printk(efi_system_table_t *sys_table_arg,
|
|
efi_char16_t *str)
|
|
{
|
|
struct efi_simple_text_output_protocol *out;
|
|
|
|
out = (struct efi_simple_text_output_protocol *)sys_table_arg->con_out;
|
|
out->output_string(out, str);
|
|
}
|
|
|
|
|
|
/*
|
|
* This function handles the architcture specific differences between arm and
|
|
* arm64 regarding where the kernel image must be loaded and any memory that
|
|
* must be reserved. On failure it is required to free all
|
|
* all allocations it has made.
|
|
*/
|
|
efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
|
|
unsigned long *image_addr,
|
|
unsigned long *image_size,
|
|
unsigned long *reserve_addr,
|
|
unsigned long *reserve_size,
|
|
unsigned long dram_base,
|
|
efi_loaded_image_t *image);
|
|
/*
|
|
* 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.
|
|
*/
|
|
unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
|
|
unsigned long *image_addr)
|
|
{
|
|
efi_loaded_image_t *image;
|
|
efi_status_t status;
|
|
unsigned long image_size = 0;
|
|
unsigned long dram_base;
|
|
/* addr/point and size pairs for memory management*/
|
|
unsigned long initrd_addr;
|
|
u64 initrd_size = 0;
|
|
unsigned long fdt_addr = 0; /* Original DTB */
|
|
unsigned long fdt_size = 0;
|
|
char *cmdline_ptr = NULL;
|
|
int cmdline_size = 0;
|
|
unsigned long new_fdt_addr;
|
|
efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
|
|
unsigned long reserve_addr = 0;
|
|
unsigned long reserve_size = 0;
|
|
|
|
/* Check if we were booted by the EFI firmware */
|
|
if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
|
|
goto fail;
|
|
|
|
pr_efi(sys_table, "Booting Linux Kernel...\n");
|
|
|
|
/*
|
|
* 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 = sys_table->boottime->handle_protocol(handle,
|
|
&loaded_image_proto, (void *)&image);
|
|
if (status != EFI_SUCCESS) {
|
|
pr_efi_err(sys_table, "Failed to get loaded image protocol\n");
|
|
goto fail;
|
|
}
|
|
|
|
dram_base = get_dram_base(sys_table);
|
|
if (dram_base == EFI_ERROR) {
|
|
pr_efi_err(sys_table, "Failed to find DRAM base\n");
|
|
goto fail;
|
|
}
|
|
status = handle_kernel_image(sys_table, image_addr, &image_size,
|
|
&reserve_addr,
|
|
&reserve_size,
|
|
dram_base, image);
|
|
if (status != EFI_SUCCESS) {
|
|
pr_efi_err(sys_table, "Failed to relocate kernel\n");
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* 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(sys_table, image, &cmdline_size);
|
|
if (!cmdline_ptr) {
|
|
pr_efi_err(sys_table, "getting command line via LOADED_IMAGE_PROTOCOL\n");
|
|
goto fail_free_image;
|
|
}
|
|
|
|
status = efi_parse_options(cmdline_ptr);
|
|
if (status != EFI_SUCCESS)
|
|
pr_efi_err(sys_table, "Failed to parse EFI cmdline options\n");
|
|
|
|
/*
|
|
* Unauthenticated device tree data is a security hazard, so
|
|
* ignore 'dtb=' unless UEFI Secure Boot is disabled.
|
|
*/
|
|
if (efi_secureboot_enabled(sys_table)) {
|
|
pr_efi(sys_table, "UEFI Secure Boot is enabled.\n");
|
|
} else {
|
|
status = handle_cmdline_files(sys_table, image, cmdline_ptr,
|
|
"dtb=",
|
|
~0UL, &fdt_addr, &fdt_size);
|
|
|
|
if (status != EFI_SUCCESS) {
|
|
pr_efi_err(sys_table, "Failed to load device tree!\n");
|
|
goto fail_free_cmdline;
|
|
}
|
|
}
|
|
|
|
if (fdt_addr) {
|
|
pr_efi(sys_table, "Using DTB from command line\n");
|
|
} else {
|
|
/* Look for a device tree configuration table entry. */
|
|
fdt_addr = (uintptr_t)get_fdt(sys_table, &fdt_size);
|
|
if (fdt_addr)
|
|
pr_efi(sys_table, "Using DTB from configuration table\n");
|
|
}
|
|
|
|
if (!fdt_addr)
|
|
pr_efi(sys_table, "Generating empty DTB\n");
|
|
|
|
status = handle_cmdline_files(sys_table, image, cmdline_ptr,
|
|
"initrd=", dram_base + SZ_512M,
|
|
(unsigned long *)&initrd_addr,
|
|
(unsigned long *)&initrd_size);
|
|
if (status != EFI_SUCCESS)
|
|
pr_efi_err(sys_table, "Failed initrd from command line!\n");
|
|
|
|
new_fdt_addr = fdt_addr;
|
|
status = allocate_new_fdt_and_exit_boot(sys_table, handle,
|
|
&new_fdt_addr, dram_base + MAX_FDT_OFFSET,
|
|
initrd_addr, initrd_size, cmdline_ptr,
|
|
fdt_addr, fdt_size);
|
|
|
|
/*
|
|
* If all went well, we need to return the FDT address to the
|
|
* calling function so it can be passed to kernel as part of
|
|
* the kernel boot protocol.
|
|
*/
|
|
if (status == EFI_SUCCESS)
|
|
return new_fdt_addr;
|
|
|
|
pr_efi_err(sys_table, "Failed to update FDT and exit boot services\n");
|
|
|
|
efi_free(sys_table, initrd_size, initrd_addr);
|
|
efi_free(sys_table, fdt_size, fdt_addr);
|
|
|
|
fail_free_cmdline:
|
|
efi_free(sys_table, cmdline_size, (unsigned long)cmdline_ptr);
|
|
|
|
fail_free_image:
|
|
efi_free(sys_table, image_size, *image_addr);
|
|
efi_free(sys_table, reserve_size, reserve_addr);
|
|
fail:
|
|
return EFI_ERROR;
|
|
}
|
|
|
|
/*
|
|
* This is the base address at which to start allocating virtual memory ranges
|
|
* for UEFI Runtime Services. This is in the low TTBR0 range so that we can use
|
|
* any allocation we choose, and eliminate the risk of a conflict after kexec.
|
|
* The value chosen is the largest non-zero power of 2 suitable for this purpose
|
|
* both on 32-bit and 64-bit ARM CPUs, to maximize the likelihood that it can
|
|
* be mapped efficiently.
|
|
*/
|
|
#define EFI_RT_VIRTUAL_BASE 0x40000000
|
|
|
|
/*
|
|
* efi_get_virtmap() - create a virtual mapping for the EFI memory map
|
|
*
|
|
* This function populates the virt_addr fields of all memory region descriptors
|
|
* in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors
|
|
* are also copied to @runtime_map, and their total count is returned in @count.
|
|
*/
|
|
void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
|
|
unsigned long desc_size, efi_memory_desc_t *runtime_map,
|
|
int *count)
|
|
{
|
|
u64 efi_virt_base = EFI_RT_VIRTUAL_BASE;
|
|
efi_memory_desc_t *out = runtime_map;
|
|
int l;
|
|
|
|
for (l = 0; l < map_size; l += desc_size) {
|
|
efi_memory_desc_t *in = (void *)memory_map + l;
|
|
u64 paddr, size;
|
|
|
|
if (!(in->attribute & EFI_MEMORY_RUNTIME))
|
|
continue;
|
|
|
|
/*
|
|
* Make the mapping compatible with 64k pages: this allows
|
|
* a 4k page size kernel to kexec a 64k page size kernel and
|
|
* vice versa.
|
|
*/
|
|
paddr = round_down(in->phys_addr, SZ_64K);
|
|
size = round_up(in->num_pages * EFI_PAGE_SIZE +
|
|
in->phys_addr - paddr, SZ_64K);
|
|
|
|
/*
|
|
* Avoid wasting memory on PTEs by choosing a virtual base that
|
|
* is compatible with section mappings if this region has the
|
|
* appropriate size and physical alignment. (Sections are 2 MB
|
|
* on 4k granule kernels)
|
|
*/
|
|
if (IS_ALIGNED(in->phys_addr, SZ_2M) && size >= SZ_2M)
|
|
efi_virt_base = round_up(efi_virt_base, SZ_2M);
|
|
|
|
in->virt_addr = efi_virt_base + in->phys_addr - paddr;
|
|
efi_virt_base += size;
|
|
|
|
memcpy(out, in, desc_size);
|
|
out = (void *)out + desc_size;
|
|
++*count;
|
|
}
|
|
}
|