efi/libstub: Extend native protocol definitions with mixed_mode aliases

In preparation of moving to a native vs. mixed mode split rather than a
32 vs. 64 bit split when it comes to invoking EFI firmware services,
update all the native protocol definitions and redefine them as unions
containing an anonymous struct for the native view and a struct called
'mixed_mode' describing the 32-bit view of the protocol when called from
64-bit code.

While at it, flesh out some PCI I/O member definitions that we will be
needing shortly.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Borislav Petkov <bp@alien8.de>
Cc: James Morse <james.morse@arm.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: https://lkml.kernel.org/r/20191224151025.32482-9-ardb@kernel.orgSigned-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/boot/compressed/eboot.h

@@ -24,10 +24,17 @@ typedef struct {
 	u64 blt;
 } efi_uga_draw_protocol_64_t;
 
-typedef struct {
-	void *get_mode;
-	void *set_mode;
-	void *blt;
+typedef union {
+	struct {
+		void *get_mode;
+		void *set_mode;
+		void *blt;
+	};
+	struct {
+		u32 get_mode;
+		u32 set_mode;
+		u32 blt;
+	} mixed_mode;
 } efi_uga_draw_protocol_t;
 
 #endif /* BOOT_COMPRESSED_EBOOT_H */

drivers/firmware/efi/libstub/arm-stub.c

@@ -40,9 +40,9 @@ static u64 virtmap_base = EFI_RT_VIRTUAL_BASE;
 void efi_char16_printk(efi_system_table_t *sys_table_arg,
 			      efi_char16_t *str)
 {
-	struct efi_simple_text_output_protocol *out;
+	efi_simple_text_output_protocol_t *out;
 
-	out = (struct efi_simple_text_output_protocol *)sys_table_arg->con_out;
+	out = (efi_simple_text_output_protocol_t *)sys_table_arg->con_out;
 	out->output_string(out, str);
 }
 

drivers/firmware/efi/libstub/random.c

@@ -9,7 +9,7 @@
 
 #include "efistub.h"
 
-typedef struct efi_rng_protocol efi_rng_protocol_t;
+typedef union efi_rng_protocol efi_rng_protocol_t;
 
 typedef struct {
 	u32 get_info;
@@ -21,11 +21,17 @@ typedef struct {
 	u64 get_rng;
 } efi_rng_protocol_64_t;
 
-struct efi_rng_protocol {
-	efi_status_t (*get_info)(struct efi_rng_protocol *,
-				 unsigned long *, efi_guid_t *);
-	efi_status_t (*get_rng)(struct efi_rng_protocol *,
-				efi_guid_t *, unsigned long, u8 *out);
+union efi_rng_protocol {
+	struct {
+		efi_status_t (*get_info)(efi_rng_protocol_t *,
+					 unsigned long *, efi_guid_t *);
+		efi_status_t (*get_rng)(efi_rng_protocol_t *,
+					efi_guid_t *, unsigned long, u8 *out);
+	};
+	struct {
+		u32 get_info;
+		u32 get_rng;
+	} mixed_mode;
 };
 
 efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table_arg,
@@ -33,7 +39,7 @@ efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table_arg,
 {
 	efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
 	efi_status_t status;
-	struct efi_rng_protocol *rng = NULL;
+	efi_rng_protocol_t *rng = NULL;
 
 	status = efi_call_early(locate_protocol, &rng_proto, NULL,
 				(void **)&rng);
@@ -162,7 +168,7 @@ efi_status_t efi_random_get_seed(efi_system_table_t *sys_table_arg)
 	efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
 	efi_guid_t rng_algo_raw = EFI_RNG_ALGORITHM_RAW;
 	efi_guid_t rng_table_guid = LINUX_EFI_RANDOM_SEED_TABLE_GUID;
-	struct efi_rng_protocol *rng = NULL;
+	efi_rng_protocol_t *rng = NULL;
 	struct linux_efi_random_seed *seed = NULL;
 	efi_status_t status;