diff options
| author | Masahisa Kojima | 2023-01-28 13:56:14 +0900 |
|---|---|---|
| committer | Heinrich Schuchardt | 2023-02-10 13:05:39 +0100 |
| commit | 1dd705cf990364eaf7312ed327b93fc04b43fbe5 (patch) | |
| tree | 40c8f68243a7ef5d6a4d7570b55ae3b1ef883b7f /include/efi.h | |
| parent | 8ad7cfec37b72c6bd629b4f1a18bf3ceebf9bd57 (diff) | |
efi: use 32-bit alignment for efi_guid_t
Current U-Boot implements 64-bit boundary for efi_guid_t structure.
It follows the UEFI specification, page 21 of the UEFI Specification v2.10
says about EFI_GUID:
128-bit buffer containing a unique identifier value. Unless
otherwise specified, aligned on a 64-bit boundary.
On the other hand, page 163 of the UEFI specification v2.10 and
EDK2 reference implementation both define EFI_GUID as
struct { u32 a; u16; b; u16 c; u8 d[8]; }; and so the implied
alignment is 32-bit not 64-bit like U-Boot efi_guid_t.
Due to this alignment difference, EDK2 application "CapsuleApp.efi -P"
does not work as expected.
This calls EFI_FIRMWARE_MANAGEMENT_PROTOCOL.GetImageInfo()
and dump the EFI_FIRMWARE_IMAGE_DESCRIPTOR structure,
offsetof(EFI_FIRMWARE_IMAGE_DESCRIPTOR, ImageTypeId) is different,
8 in U-Boot and 4 in EDK2(CapsuleApp.efi).
Here is the wrong EFI_GUID dump.
wrong dump : ImageTypeId - 00000000-7D83-058B-D550-474CA19560D8
expected : ImageTypeId - 058B7D83-50D5-4C47-A195-60D86AD341C4
EFI_FIRMWARE_IMAGE_DESCRIPTOR structure is defined in UEFI specification:
typedef struct {
UINT8 ImageIndex;
EFI_GUID ImageTypeId;
UINT64 ImageId
<snip>
} EFI_FIRMWARE_IMAGE_DESCRIPTOR;
There was the relevant patch for linux kernel to use 32-bit alignment
for efi_guid_t [1].
U-Boot should get aligned to EDK2 reference implementation and
linux kernel.
Due to this alignment change, efi_hii_ref structure in include/efi_api.h
is affected, but it is not used in the current U-Boot code.
[1] https://lore.kernel.org/all/20190202094119.13230-5-ard.biesheuvel@linaro.org/
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Diffstat (limited to 'include/efi.h')
| -rw-r--r-- | include/efi.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/include/efi.h b/include/efi.h index 42f4e58a917..c3087d3da28 100644 --- a/include/efi.h +++ b/include/efi.h @@ -54,9 +54,18 @@ struct efi_device_path; +/* + * The EFI spec defines the EFI_GUID as + * "128-bit buffer containing a unique identifier value. Unless otherwise specified, + * aligned on a 64-bit boundary". + * Page 163 of the UEFI specification v2.10 and + * EDK2 reference implementation both define EFI_GUID as + * struct { u32 a; u16; b; u16 c; u8 d[8]; }; which is 4-byte + * aligned. + */ typedef struct { u8 b[16]; -} efi_guid_t __attribute__((aligned(8))); +} efi_guid_t __attribute__((aligned(4))); #define EFI_BITS_PER_LONG (sizeof(long) * 8) |