efi/libstub: add prototype of efi_tcg2_protocol::hash_log_extend_event()

Define the right prototype for efi_tcg2_protocol::hash_log_extend_event()
and add the required structs so we can start using it to measure the initrd
into the TPM if it was loaded by the EFI stub itself.

Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Ilias Apalodimas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ard Biesheuvel <[email protected]>

arch/x86/include/asm/efi.h

@@ -308,6 +308,10 @@ static inline u32 efi64_convert_status(efi_status_t status)
 #define __efi64_argmap_query_mode(gop, mode, size, info)		\
 	((gop), (mode), efi64_zero_upper(size), efi64_zero_upper(info))
 
+/* TCG2 protocol */
+#define __efi64_argmap_hash_log_extend_event(prot, fl, addr, size, ev)	\
+	((prot), (fl), 0ULL, (u64)(addr), 0ULL, (u64)(size), 0ULL, ev)
+
 /*
  * The macros below handle the plumbing for the argument mapping. To add a
  * mapping for a specific EFI method, simply define a macro

drivers/firmware/efi/libstub/efistub.h

@@ -667,6 +667,29 @@ union apple_properties_protocol {
 
 typedef u32 efi_tcg2_event_log_format;
 
+#define INITRD_EVENT_TAG_ID 0x8F3B22ECU
+#define EV_EVENT_TAG 0x00000006U
+#define EFI_TCG2_EVENT_HEADER_VERSION	0x1
+
+struct efi_tcg2_event {
+	u32		event_size;
+	struct {
+		u32	header_size;
+		u16	header_version;
+		u32	pcr_index;
+		u32	event_type;
+	} __packed event_header;
+	/* u8[] event follows here */
+} __packed;
+
+struct efi_tcg2_tagged_event {
+	u32 tagged_event_id;
+	u32 tagged_event_data_size;
+	/* u8  tagged event data follows here */
+} __packed;
+
+typedef struct efi_tcg2_event efi_tcg2_event_t;
+typedef struct efi_tcg2_tagged_event efi_tcg2_tagged_event_t;
 typedef union efi_tcg2_protocol efi_tcg2_protocol_t;
 
 union efi_tcg2_protocol {
@@ -677,7 +700,11 @@ union efi_tcg2_protocol {
 						       efi_physical_addr_t *,
 						       efi_physical_addr_t *,
 						       efi_bool_t *);
-		void *hash_log_extend_event;
+		efi_status_t (__efiapi *hash_log_extend_event)(efi_tcg2_protocol_t *,
+							       u64,
+							       efi_physical_addr_t,
+							       u64,
+							       const efi_tcg2_event_t *);
 		void *submit_command;
 		void *get_active_pcr_banks;
 		void *set_active_pcr_banks;