[PATCH 19/19] efi/libstub: Make the LoadFile EFI protocol accessible

[Ard Biesheuvel <ardb@kernel.org>]

Add the protocol definitions, GUIDs and mixed mode glue so that
the EFI loadfile protocol can be used from the stub. This will
be used in a future patch to load the initrd.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/x86/include/asm/efi.h             |  4 ++++
 drivers/firmware/efi/libstub/efistub.h | 14 ++++++++++++++
 include/linux/efi.h                    |  2 ++
 3 files changed, 20 insertions(+)

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 9ced980b123b..fcb21e3d13c5 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -291,6 +291,10 @@ static inline void *efi64_zero_upper(void *p)
 	((protocol), efi64_zero_upper(seg), efi64_zero_upper(bus),	\
 	 efi64_zero_upper(dev), efi64_zero_upper(func))
 
+/* LoadFile */
+#define __efi64_argmap_load_file(protocol, path, policy, bufsize, buf)	\
+	((protocol), (path), (policy), efi64_zero_upper(bufsize), (buf))
+
 /*
  * 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 afa774a312f5..34fe3fad042f 100644
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -541,6 +541,20 @@ union efi_tcg2_protocol {
 	} mixed_mode;
 };
 
+typedef union efi_load_file_protocol efi_load_file_protocol_t;
+typedef union efi_load_file_protocol efi_load_file2_protocol_t;
+
+union efi_load_file_protocol {
+	struct {
+		efi_status_t (__efiapi *load_file)(efi_load_file_protocol_t *,
+						   efi_device_path_protocol_t *,
+						   bool, unsigned long *, void *);
+	};
+	struct {
+		u32 load_file;
+	} mixed_mode;
+};
+
 void efi_pci_disable_bridge_busmaster(void);
 
 typedef efi_status_t (*efi_exit_boot_map_processing)(
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 0e047d2738cd..9ccf313fe9de 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -332,6 +332,8 @@ void efi_native_runtime_setup(void);
 #define EFI_CONSOLE_OUT_DEVICE_GUID		EFI_GUID(0xd3b36f2c, 0xd551, 0x11d4,  0x9a, 0x46, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d)
 #define APPLE_PROPERTIES_PROTOCOL_GUID		EFI_GUID(0x91bd12fe, 0xf6c3, 0x44fb,  0xa5, 0xb7, 0x51, 0x22, 0xab, 0x30, 0x3a, 0xe0)
 #define EFI_TCG2_PROTOCOL_GUID			EFI_GUID(0x607f766c, 0x7455, 0x42be,  0x93, 0x0b, 0xe4, 0xd7, 0x6d, 0xb2, 0x72, 0x0f)
+#define EFI_LOAD_FILE_PROTOCOL_GUID		EFI_GUID(0x56ec3091, 0x954c, 0x11d2,  0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b)
+#define EFI_LOAD_FILE2_PROTOCOL_GUID		EFI_GUID(0x4006c0c1, 0xfcb3, 0x403e,  0x99, 0x6d, 0x4a, 0x6c, 0x87, 0x24, 0xe0, 0x6d)
 
 #define EFI_IMAGE_SECURITY_DATABASE_GUID	EFI_GUID(0xd719b2cb, 0x3d3a, 0x4596,  0xa3, 0xbc, 0xda, 0xd0, 0x0e, 0x67, 0x65, 0x6f)
 #define EFI_SHIM_LOCK_GUID			EFI_GUID(0x605dab50, 0xe046, 0x4300,  0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23)
-- 
2.17.1