linux/arch/x86/include/asm/efi.h

#ifndef _ASM_X86_EFI_H
#define _ASM_X86_EFI_H

#ifdef CONFIG_X86_32

#define EFI_LOADER_SIGNATURE	"EL32"

extern unsigned long asmlinkage efi_call_phys(void *, ...);

#define efi_call_phys0(f)		efi_call_phys(f)
#define efi_call_phys1(f, a1)		efi_call_phys(f, a1)
#define efi_call_phys2(f, a1, a2)	efi_call_phys(f, a1, a2)
#define efi_call_phys3(f, a1, a2, a3)	efi_call_phys(f, a1, a2, a3)
#define efi_call_phys4(f, a1, a2, a3, a4)	\
	efi_call_phys(f, a1, a2, a3, a4)
#define efi_call_phys5(f, a1, a2, a3, a4, a5)	\
	efi_call_phys(f, a1, a2, a3, a4, a5)
#define efi_call_phys6(f, a1, a2, a3, a4, a5, a6)	\
	efi_call_phys(f, a1, a2, a3, a4, a5, a6)
/*
 * Wrap all the virtual calls in a way that forces the parameters on the stack.
 */

#define efi_call_virt(f, args...) \
	((efi_##f##_t __attribute__((regparm(0)))*)efi.systab->runtime->f)(args)

#define efi_call_virt0(f)		efi_call_virt(f)
#define efi_call_virt1(f, a1)		efi_call_virt(f, a1)
#define efi_call_virt2(f, a1, a2)	efi_call_virt(f, a1, a2)
#define efi_call_virt3(f, a1, a2, a3)	efi_call_virt(f, a1, a2, a3)
#define efi_call_virt4(f, a1, a2, a3, a4)	\
	efi_call_virt(f, a1, a2, a3, a4)
#define efi_call_virt5(f, a1, a2, a3, a4, a5)	\
	efi_call_virt(f, a1, a2, a3, a4, a5)
#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6)	\
	efi_call_virt(f, a1, a2, a3, a4, a5, a6)

#define efi_ioremap(addr, size, type, attr)	ioremap_cache(addr, size)

#else /* !CONFIG_X86_32 */

#define EFI_LOADER_SIGNATURE	"EL64"

extern u64 efi_call0(void *fp);
extern u64 efi_call1(void *fp, u64 arg1);
extern u64 efi_call2(void *fp, u64 arg1, u64 arg2);
extern u64 efi_call3(void *fp, u64 arg1, u64 arg2, u64 arg3);
extern u64 efi_call4(void *fp, u64 arg1, u64 arg2, u64 arg3, u64 arg4);
extern u64 efi_call5(void *fp, u64 arg1, u64 arg2, u64 arg3,
		     u64 arg4, u64 arg5);
extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
		     u64 arg4, u64 arg5, u64 arg6);

#define efi_call_phys0(f)			\
	efi_call0((void *)(f))
#define efi_call_phys1(f, a1)			\
	efi_call1((void *)(f), (u64)(a1))
#define efi_call_phys2(f, a1, a2)			\
	efi_call2((void *)(f), (u64)(a1), (u64)(a2))
#define efi_call_phys3(f, a1, a2, a3)				\
	efi_call3((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3))
#define efi_call_phys4(f, a1, a2, a3, a4)				\
	efi_call4((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3),		\
		  (u64)(a4))
#define efi_call_phys5(f, a1, a2, a3, a4, a5)				\
	efi_call5((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3),		\
		  (u64)(a4), (u64)(a5))
#define efi_call_phys6(f, a1, a2, a3, a4, a5, a6)			\
	efi_call6((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3),		\
		  (u64)(a4), (u64)(a5), (u64)(a6))

#define efi_call_virt0(f)				\
	efi_call0((void *)(efi.systab->runtime->f))
#define efi_call_virt1(f, a1)					\
	efi_call1((void *)(efi.systab->runtime->f), (u64)(a1))
#define efi_call_virt2(f, a1, a2)					\
	efi_call2((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2))
#define efi_call_virt3(f, a1, a2, a3)					\
	efi_call3((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
		  (u64)(a3))
#define efi_call_virt4(f, a1, a2, a3, a4)				\
	efi_call4((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
		  (u64)(a3), (u64)(a4))
#define efi_call_virt5(f, a1, a2, a3, a4, a5)				\
	efi_call5((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
		  (u64)(a3), (u64)(a4), (u64)(a5))
#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6)			\
	efi_call6((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
		  (u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))

extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
				 u32 type, u64 attribute);

#endif /* CONFIG_X86_32 */

extern int add_efi_memmap;
extern unsigned long x86_efi_facility;
extern void efi_set_executable(efi_memory_desc_t *md, bool executable);
extern int efi_memblock_x86_reserve_range(void);
extern void efi_call_phys_prelog(void);
extern void efi_call_phys_epilog(void);
extern void efi_unmap_memmap(void);
extern void efi_memory_uc(u64 addr, unsigned long size);

struct efi_var_bootdata {
	struct setup_data data;
	u64 store_size;
	u64 remaining_size;
	u64 max_var_size;
};

#ifdef CONFIG_EFI

static inline bool efi_is_native(void)
{
	return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
}

#else
/*
 * IF EFI is not configured, have the EFI calls return -ENOSYS.
 */
#define efi_call0(_f)					(-ENOSYS)
#define efi_call1(_f, _a1)				(-ENOSYS)
#define efi_call2(_f, _a1, _a2)				(-ENOSYS)
#define efi_call3(_f, _a1, _a2, _a3)			(-ENOSYS)
#define efi_call4(_f, _a1, _a2, _a3, _a4)		(-ENOSYS)
#define efi_call5(_f, _a1, _a2, _a3, _a4, _a5)		(-ENOSYS)
#define efi_call6(_f, _a1, _a2, _a3, _a4, _a5, _a6)	(-ENOSYS)
#endif /* CONFIG_EFI */

#endif /* _ASM_X86_EFI_H */