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efi_loader: support EFI_LOAD_FILE_PROTOCOL

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Support loading images via the EFI_LOAD_FILE_PROTOCOL and
EFI_LOAD_FILE2_PROTOCOL.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-12-06 13:00:15 +01:00
parent 0e074d1239
commit 3da0b28582
1 changed files with 48 additions and 1 deletions
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49
lib/efi_loader/efi_boottime.c
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@ -1942,6 +1942,10 @@ efi_status_t efi_load_image_from_path(bool boot_policy,
efi_handle_t device;
efi_status_t ret;
struct efi_device_path *dp;
struct efi_load_file_protocol *load_file_protocol = NULL;
efi_uintn_t buffer_size;
uint64_t addr, pages;
const efi_guid_t *guid;
/* In case of failure nothing is returned */
*buffer = NULL;
@ -1952,7 +1956,50 @@ efi_status_t efi_load_image_from_path(bool boot_policy,
&efi_simple_file_system_protocol_guid, &dp, &device));
if (ret == EFI_SUCCESS)
return efi_load_image_from_file(file_path, buffer, size);
return EFI_NOT_FOUND;
ret = EFI_CALL(efi_locate_device_path(
&efi_guid_load_file_protocol, &dp, &device));
if (ret == EFI_SUCCESS) {
guid = &efi_guid_load_file_protocol;
} else if (!boot_policy) {
guid = &efi_guid_load_file2_protocol;
ret = EFI_CALL(efi_locate_device_path(guid, &dp, &device));
}
if (ret != EFI_SUCCESS)
return EFI_NOT_FOUND;
ret = EFI_CALL(efi_handle_protocol(device, guid,
(void **)&load_file_protocol));
if (ret != EFI_SUCCESS)
return EFI_NOT_FOUND;
buffer_size = 0;
ret = load_file_protocol->load_file(load_file_protocol, dp,
boot_policy, &buffer_size,
NULL);
if (ret != EFI_BUFFER_TOO_SMALL)
goto out;
pages = efi_size_in_pages(buffer_size);
ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES, EFI_BOOT_SERVICES_DATA,
pages, &addr);
if (ret != EFI_SUCCESS) {
ret = EFI_OUT_OF_RESOURCES;
goto out;
}
ret = EFI_CALL(load_file_protocol->load_file(
load_file_protocol, dp, boot_policy,
&buffer_size, (void *)(uintptr_t)addr));
if (ret != EFI_SUCCESS)
efi_free_pages(addr, pages);
out:
if (load_file_protocol)
EFI_CALL(efi_close_protocol(device,
&efi_guid_load_file2_protocol,
efi_root, NULL));
if (ret == EFI_SUCCESS) {
*buffer = (void *)(uintptr_t)addr;
*size = buffer_size;
}
return ret;
}
/**