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efi/libstub: Unify initrd loading across architectures

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Factor out the initrd loading into a common function that can be called
both from the generic efi-stub.c and the x86-specific x86-stub.c.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200430182843.2510180-10-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Arvind Sankar 2020-04-30 14:28:41 -04:00 committed by Ard Biesheuvel
parent 987053a300
commit f61900fd0e
4 changed files with 52 additions and 40 deletions
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46
drivers/firmware/efi/libstub/efi-stub-helper.c
View file

@ -331,6 +331,7 @@ static const struct {
* %EFI_OUT_OF_RESOURCES if memory allocation failed
* %EFI_LOAD_ERROR in all other cases
*/
static
efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
unsigned long *load_size,
unsigned long max)
@ -343,9 +344,6 @@ efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
efi_handle_t handle;
efi_status_t status;
if (!load_addr || !load_size)
return EFI_INVALID_PARAMETER;
dp = (efi_device_path_protocol_t *)&initrd_dev_path;
status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle);
if (status != EFI_SUCCESS)
@ -375,3 +373,45 @@ efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
*load_size = initrd_size;
return EFI_SUCCESS;
}
static
efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image,
unsigned long *load_addr,
unsigned long *load_size,
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))) {
*load_addr = *load_size = 0;
return EFI_SUCCESS;
}
return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2,
soft_limit, hard_limit,
load_addr, load_size);
}
efi_status_t efi_load_initrd(efi_loaded_image_t *image,
unsigned long *load_addr,
unsigned long *load_size,
unsigned long soft_limit,
unsigned long hard_limit)
{
efi_status_t status;
if (!load_addr || !load_size)
return EFI_INVALID_PARAMETER;
status = efi_load_initrd_dev_path(load_addr, load_size, hard_limit);
if (status == EFI_SUCCESS) {
efi_info("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n");
} else if (status == EFI_NOT_FOUND) {
status = efi_load_initrd_cmdline(image, load_addr, load_size,
soft_limit, hard_limit);
if (status == EFI_SUCCESS && *load_size > 0)
efi_info("Loaded initrd from command line option\n");
}
return status;
}

12
drivers/firmware/efi/libstub/efi-stub.c
View file

@ -265,16 +265,8 @@ efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg)
if (!efi_noinitrd) {
max_addr = efi_get_max_initrd_addr(dram_base, image_addr);
status = efi_load_initrd_dev_path(&initrd_addr, &initrd_size,
max_addr);
if (status == EFI_SUCCESS) {
efi_info("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n");
} else if (status == EFI_NOT_FOUND) {
status = efi_load_initrd(image, &initrd_addr, &initrd_size,
ULONG_MAX, max_addr);
if (status == EFI_SUCCESS && initrd_size > 0)
efi_info("Loaded initrd from command line option\n");
}
status = efi_load_initrd(image, &initrd_addr, &initrd_size,
ULONG_MAX, max_addr);
if (status != EFI_SUCCESS)
efi_err("Failed to load initrd!\n");
}

21
drivers/firmware/efi/libstub/efistub.h
View file

@ -677,21 +677,10 @@ static inline efi_status_t efi_load_dtb(efi_loaded_image_t *image,
ULONG_MAX, ULONG_MAX, load_addr, load_size);
}
static inline efi_status_t efi_load_initrd(efi_loaded_image_t *image,
unsigned long *load_addr,
unsigned long *load_size,
unsigned long soft_limit,
unsigned long hard_limit)
{
if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER))
return EFI_SUCCESS;
return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2,
soft_limit, hard_limit, load_addr, load_size);
}
efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
unsigned long *load_size,
unsigned long max);
efi_status_t efi_load_initrd(efi_loaded_image_t *image,
unsigned long *load_addr,
unsigned long *load_size,
unsigned long soft_limit,
unsigned long hard_limit);
#endif

13
drivers/firmware/efi/libstub/x86-stub.c
View file

@ -755,17 +755,8 @@ unsigned long efi_main(efi_handle_t handle,
if (!efi_noinitrd) {
unsigned long addr, size;
status = efi_load_initrd_dev_path(&addr, &size, ULONG_MAX);
if (status == EFI_NOT_FOUND) {
if (efi_is_native() && image != NULL) {
status = efi_load_initrd(image, &addr, &size,
hdr->initrd_addr_max,
ULONG_MAX);
} else {
addr = size = 0;
status = EFI_SUCCESS;
}
}
status = efi_load_initrd(image, &addr, &size,
hdr->initrd_addr_max, ULONG_MAX);
if (status != EFI_SUCCESS) {
efi_err("Failed to load initrd!\n");