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efi_loader: get lowest supported version from device tree

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This commit gets the lowest supported version from device tree,
then fills the lowest supported version in FMP->GetImageInfo().

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Masahisa Kojima 2023-06-07 14:41:54 +09:00 committed by Heinrich Schuchardt
parent 3cba9702d1
commit 25dc7d5aed
2 changed files with 71 additions and 1 deletions
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22
doc/device-tree-bindings/firmware/firmware-version.txt Normal file
View file

@ -0,0 +1,22 @@
firmware-version bindings
-------------------------------
Required properties:
- image-type-id : guid for image blob type
- image-index : image index
- lowest-supported-version : lowest supported version
Example:
firmware-version {
image1 {
image-type-id = "09D7CF52-0720-4710-91D1-08469B7FE9C8";
image-index = <1>;
lowest-supported-version = <3>;
};
image2 {
image-type-id = "5A7021F5-FEF2-48B4-AABA-832E777418C0";
image-index = <2>;
lowest-supported-version = <7>;
};
};

50
lib/efi_loader/efi_firmware.c
View file

@ -144,6 +144,51 @@ efi_status_t EFIAPI efi_firmware_set_package_info_unsupported(
return EFI_EXIT(EFI_UNSUPPORTED);
}
/**
* efi_firmware_get_lsv_from_dtb - get lowest supported version from dtb
* @image_index: Image index
* @image_type_id: Image type id
* @lsv: Pointer to store the lowest supported version
*
* Read the firmware version information from dtb.
*/
static void efi_firmware_get_lsv_from_dtb(u8 image_index,
efi_guid_t *image_type_id, u32 *lsv)
{
const void *fdt = gd->fdt_blob;
const fdt32_t *val;
const char *guid_str;
int len, offset, index;
int parent;
*lsv = 0;
parent = fdt_subnode_offset(fdt, 0, "firmware-version");
if (parent < 0)
return;
fdt_for_each_subnode(offset, fdt, parent) {
efi_guid_t guid;
guid_str = fdt_getprop(fdt, offset, "image-type-id", &len);
if (!guid_str)
continue;
uuid_str_to_bin(guid_str, guid.b, UUID_STR_FORMAT_GUID);
val = fdt_getprop(fdt, offset, "image-index", &len);
if (!val)
continue;
index = fdt32_to_cpu(*val);
if (!guidcmp(&guid, image_type_id) && index == image_index) {
val = fdt_getprop(fdt, offset,
"lowest-supported-version", &len);
if (val)
*lsv = fdt32_to_cpu(*val);
}
}
}
/**
* efi_firmware_fill_version_info - fill the version information
* @image_info: Image information
@ -171,8 +216,11 @@ void efi_firmware_fill_version_info(struct efi_firmware_image_descriptor *image_
else
image_info->version = 0;
efi_firmware_get_lsv_from_dtb(fw_array->image_index,
&fw_array->image_type_id,
&image_info->lowest_supported_image_version);
image_info->version_name = NULL; /* not supported */
image_info->lowest_supported_image_version = 0;
image_info->last_attempt_version = 0;
image_info->last_attempt_status = LAST_ATTEMPT_STATUS_SUCCESS;
}