efi/libstub/x86: Incorporate eboot.c into libstub

Most of the EFI stub source files of all architectures reside under
drivers/firmware/efi/libstub, where they share a Makefile with special
CFLAGS and an include file with declarations that are only relevant
for stub code.

Currently, we carry a lot of stub specific stuff in linux/efi.h only
because eboot.c in arch/x86 needs them as well. So let's move eboot.c
into libstub/, and move the contents of eboot.h that we still care
about into efistub.h

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

arch/x86/boot/compressed/Makefile

@@ -87,10 +87,7 @@ endif
 
 vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
 
-$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
-
-vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o \
-	$(objtree)/drivers/firmware/efi/libstub/lib.a
+vmlinux-objs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o
 
 # The compressed kernel is built with -fPIC/-fPIE so that a boot loader

drivers/firmware/efi/libstub/Makefile

@@ -53,6 +53,7 @@ lib-$(CONFIG_EFI_ARMSTUB)	+= arm-stub.o fdt.o string.o \
 
 lib-$(CONFIG_ARM)		+= arm32-stub.o
 lib-$(CONFIG_ARM64)		+= arm64-stub.o
+lib-$(CONFIG_X86)		+= x86-stub.o
 CFLAGS_arm32-stub.o		:= -DTEXT_OFFSET=$(TEXT_OFFSET)
 CFLAGS_arm64-stub.o		:= -DTEXT_OFFSET=$(TEXT_OFFSET)
 

drivers/firmware/efi/libstub/efistub.h

@@ -90,4 +90,20 @@ void *get_efi_config_table(efi_guid_t guid);
 	efi_rt_call(set_variable, (efi_char16_t *)(name),	\
 		    (efi_guid_t *)(vendor), __VA_ARGS__)
 
+typedef union efi_uga_draw_protocol efi_uga_draw_protocol_t;
+
+union efi_uga_draw_protocol {
+	struct {
+		efi_status_t (__efiapi *get_mode)(efi_uga_draw_protocol_t *,
+						  u32*, u32*, u32*, u32*);
+		void *set_mode;
+		void *blt;
+	};
+	struct {
+		u32 get_mode;
+		u32 set_mode;
+		u32 blt;
+	} mixed_mode;
+};
+
 #endif

arch/x86/boot/compressed/eboot.c → drivers/firmware/efi/libstub/x86-stub.c

@@ -6,8 +6,6 @@
  *
  * ----------------------------------------------------------------------- */
 
-#pragma GCC visibility push(hidden)
-
 #include <linux/efi.h>
 #include <linux/pci.h>
 
@@ -17,8 +15,7 @@
 #include <asm/desc.h>
 #include <asm/boot.h>
 
-#include "../string.h"
-#include "eboot.h"
+#include "efistub.h"
 
 static efi_system_table_t *sys_table;
 extern const bool efi_is64;