[RFC PATCH 5/7] efi/libstub: add prototype of efi_tcg2_protocol::hash_log_extend_event()

[Ard Biesheuvel <ardb@kernel.org>]

Define the right prototype for efi_tcg2_protocol::hash_log_extend_event()
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 <ardb@kernel.org>
---
 arch/x86/include/asm/efi.h             |  4 ++++
 drivers/firmware/efi/libstub/efistub.h | 22 +++++++++++++++++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index b921b593e0a3..73316cd67086 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -303,6 +303,10 @@ 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
diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index 2c621bf4760f..c96085133648 100644
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -667,6 +667,20 @@ union apple_properties_protocol {
 
 typedef u32 efi_tcg2_event_log_format;
 
+#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;
+	}		event_header;
+	/* u8[] event follows here */
+} __packed;
+
+typedef struct efi_tcg2_event efi_tcg2_event_t;
 typedef union efi_tcg2_protocol efi_tcg2_protocol_t;
 
 union efi_tcg2_protocol {
@@ -677,7 +691,11 @@ 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;
@@ -857,4 +875,6 @@ efi_enable_reset_attack_mitigation(void) { }
 
 void efi_retrieve_tpm2_eventlog(void);
 
+void efi_tpm_measure_initrd(unsigned long addr, unsigned long size);
+
 #endif
-- 
2.17.1