efi/arm64: efistub: Move shared dependencies to <asm/efi.h>

This moves definitions depended upon both by code under arch/arm64/boot
and under drivers/firmware/efi to <asm/efi.h>. This is in preparation of
turning the stub code under drivers/firmware/efi into a static library.

Signed-off-by: Ard Biesheuvel <[e-mail]>
Signed-off-by: Matt Fleming <[e-mail]>

arch/arm64/include/asm/efi.h

···
 	kernel_neon_end();						\
 })
 
+/* arch specific definitions used by the stub code */
+
+/*
+ * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
+ * start of kernel and may not cross a 2MiB boundary. We set alignment to
+ * 2MiB so we know it won't cross a 2MiB boundary.
+ */
+#define EFI_FDT_ALIGN	SZ_2M   /* used by allocate_new_fdt_and_exit_boot() */
+#define MAX_FDT_OFFSET	SZ_512M
+
+#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
+
 #endif /* _ASM_EFI_H */

arch/arm64/kernel/efi-stub.c

···
  *
  */
 #include <linux/efi.h>
+#include <asm/efi.h>
 #include <linux/libfdt.h>
 #include <asm/sections.h>
-
-/*
- * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
- * start of kernel and may not cross a 2MiB boundary. We set alignment to
- * 2MiB so we know it won't cross a 2MiB boundary.
- */
-#define EFI_FDT_ALIGN	SZ_2M   /* used by allocate_new_fdt_and_exit_boot() */
-#define MAX_FDT_OFFSET	SZ_512M
-
-#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
 
 static void efi_char16_printk(efi_system_table_t *sys_table_arg,
 			      efi_char16_t *str);