[PATCH v6 1/4] efi: Introduce EFI_FIRMWARE_MANAGEMENT_CAPSULE_HEADER and corresponding structures

Chen Yu
2021-10-25T06:25:45Z

Platform Firmware Runtime Update image starts with UEFI headers, and the
headers are defined in UEFI specification, but some of them have not been
defined in the kernel yet.

For example, the header layout of a capsule file looks like this:

EFI_CAPSULE_HEADER
EFI_FIRMWARE_MANAGEMENT_CAPSULE_HEADER
EFI_FIRMWARE_MANAGEMENT_CAPSULE_IMAGE_HEADER
EFI_FIRMWARE_IMAGE_AUTHENTICATION

These structures would be used by the Platform Firmware Runtime Update
driver to parse the format of capsule file to verify if the corresponding
version number is valid. The EFI_CAPSULE_HEADER has been defined in the
kernel, however the rest are not, thus introduce corresponding UEFI
structures accordingly. Besides, EFI_FIRMWARE_MANAGEMENT_CAPSULE_HEADER
and EFI_FIRMWARE_MANAGEMENT_CAPSULE_IMAGE_HEADER need not be aligned and
so the corresponding data types should be packed.

Signed-off-by: Chen Yu <yu.c.chen@intel.com>
---
v6: No change since v5.
v5: No change since v4.
v4: Revise the commit log to make it more clear. (Rafael J. Wysocki)
---
include/linux/efi.h | 50 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 6b5d36babfcc..19ff834e1388 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -148,6 +148,56 @@ typedef struct {
u32 imagesize;
} efi_capsule_header_t;

+#pragma pack(1)
+
+/* EFI_FIRMWARE_MANAGEMENT_CAPSULE_HEADER */
+typedef struct {
+ u32 ver;
+ u16 emb_drv_cnt;
+ u16 payload_cnt;
+ /*
+ * Variable array indicated by number of
+ * (emb_drv_cnt + payload_cnt)
+ */
+ u64 offset_list[];
+} efi_manage_capsule_header_t;
+
+/* EFI_FIRMWARE_MANAGEMENT_CAPSULE_IMAGE_HEADER */
+typedef struct {
+ u32 ver;
+ guid_t image_type_id;
+ u8 image_index;
+ u8 reserved_bytes[3];
+ u32 image_size;
+ u32 vendor_code_size;
+ /* ver = 2. */
+ u64 hw_ins;
+ /* ver = v3. */
+ u64 capsule_support;
+} efi_manage_capsule_image_header_t;
+
+#pragma pack()
+
+/* WIN_CERTIFICATE */
+typedef struct {
+ u32 len;
+ u16 rev;
+ u16 cert_type;
+} win_cert_t;
+
+/* WIN_CERTIFICATE_UEFI_GUID */
+typedef struct {
+ win_cert_t hdr;
+ guid_t cert_type;
+ u8 cert_data[];
+} win_cert_uefi_guid_t;
+
+/* EFI_FIRMWARE_IMAGE_AUTHENTICATIO */
+typedef struct {
+ u64 mon_count;
+ win_cert_uefi_guid_t auth_info;
+} efi_image_auth_t;
+
/*
* EFI capsule flags
*/
--
2.25.1