[linux-block.git] / arch / x86 / include / asm / efi.h

#ifndef _ASM_X86_EFI_H
#define _ASM_X86_EFI_H

#include <asm/i387.h>
/*
 * We map the EFI regions needed for runtime services non-contiguously,
 * with preserved alignment on virtual addresses starting from -4G down
 * for a total max space of 64G. This way, we provide for stable runtime
 * services addresses across kernels so that a kexec'd kernel can still
 * use them.
 *
 * This is the main reason why we're doing stable VA mappings for RT
 * services.
 *
 * This flag is used in conjuction with a chicken bit called
 * "efi=old_map" which can be used as a fallback to the old runtime
 * services mapping method in case there's some b0rkage with a
 * particular EFI implementation (haha, it is hard to hold up the
 * sarcasm here...).
 */
#define EFI_OLD_MEMMAP		EFI_ARCH_1

#define EFI32_LOADER_SIGNATURE	"EL32"
#define EFI64_LOADER_SIGNATURE	"EL64"

#ifdef CONFIG_X86_32


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

/*
 * Wrap all the virtual calls in a way that forces the parameters on the stack.
 */

/* Use this macro if your virtual returns a non-void value */
#define efi_call_virt(f, args...) \
({									\
	efi_status_t __s;						\
	kernel_fpu_begin();						\
	__s = ((efi_##f##_t __attribute__((regparm(0)))*)		\
		efi.systab->runtime->f)(args);				\
	kernel_fpu_end();						\
	__s;								\
})

/* Use this macro if your virtual call does not return any value */
#define __efi_call_virt(f, args...) \
({									\
	kernel_fpu_begin();						\
	((efi_##f##_t __attribute__((regparm(0)))*)			\
		efi.systab->runtime->f)(args);				\
	kernel_fpu_end();						\
})

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

#else /* !CONFIG_X86_32 */

#define EFI_LOADER_SIGNATURE	"EL64"

extern u64 asmlinkage efi_call(void *fp, ...);

#define efi_call_phys(f, args...)		efi_call((f), args)

#define efi_call_virt(f, ...)						\
({									\
	efi_status_t __s;						\
									\
	efi_sync_low_kernel_mappings();					\
	preempt_disable();						\
	__kernel_fpu_begin();						\
	__s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__);	\
	__kernel_fpu_end();						\
	preempt_enable();						\
	__s;								\
})

/*
 * All X86_64 virt calls return non-void values. Thus, use non-void call for
 * virt calls that would be void on X86_32.
 */
#define __efi_call_virt(f, args...) efi_call_virt(f, args)

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 struct efi_scratch efi_scratch;
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);
extern void __init efi_map_region(efi_memory_desc_t *md);
extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
extern void efi_sync_low_kernel_mappings(void);
extern int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
extern void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
extern void __init old_map_region(efi_memory_desc_t *md);
extern void __init runtime_code_page_mkexec(void);
extern void __init efi_runtime_mkexec(void);
extern void __init efi_dump_pagetable(void);
extern void __init efi_apply_memmap_quirks(void);

struct efi_setup_data {
	u64 fw_vendor;
	u64 runtime;
	u64 tables;
	u64 smbios;
	u64 reserved[8];
};

extern u64 efi_setup;

#ifdef CONFIG_EFI

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

static inline bool efi_runtime_supported(void)
{
	if (efi_is_native())
		return true;

	if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
		return true;

	return false;
}

extern struct console early_efi_console;
extern void parse_efi_setup(u64 phys_addr, u32 data_len);

#ifdef CONFIG_EFI_MIXED
extern void efi_thunk_runtime_setup(void);
extern efi_status_t efi_thunk_set_virtual_address_map(
	void *phys_set_virtual_address_map,
	unsigned long memory_map_size,
	unsigned long descriptor_size,
	u32 descriptor_version,
	efi_memory_desc_t *virtual_map);
#else
static inline void efi_thunk_runtime_setup(void) {}
static inline efi_status_t efi_thunk_set_virtual_address_map(
	void *phys_set_virtual_address_map,
	unsigned long memory_map_size,
	unsigned long descriptor_size,
	u32 descriptor_version,
	efi_memory_desc_t *virtual_map)
{
	return EFI_SUCCESS;
}
#endif /* CONFIG_EFI_MIXED */
#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)
static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
#endif /* CONFIG_EFI */

#endif /* _ASM_X86_EFI_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_EFI_H
1965aae3 PA	2	#define _ASM_X86_EFI_H
5b83683f	3
de05764e	4	#include <asm/i387.h>
d2f7cbe7 BP	5	/*
	6	* We map the EFI regions needed for runtime services non-contiguously,
	7	* with preserved alignment on virtual addresses starting from -4G down
	8	* for a total max space of 64G. This way, we provide for stable runtime
	9	* services addresses across kernels so that a kexec'd kernel can still
	10	* use them.
	11	*
	12	* This is the main reason why we're doing stable VA mappings for RT
	13	* services.
	14	*
	15	* This flag is used in conjuction with a chicken bit called
	16	* "efi=old_map" which can be used as a fallback to the old runtime
	17	* services mapping method in case there's some b0rkage with a
	18	* particular EFI implementation (haha, it is hard to hold up the
	19	* sarcasm here...).
	20	*/
	21	#define EFI_OLD_MEMMAP EFI_ARCH_1
	22
b8ff87a6 MF	23	#define EFI32_LOADER_SIGNATURE "EL32"
	24	#define EFI64_LOADER_SIGNATURE "EL64"
	25
5b83683f	26	#ifdef CONFIG_X86_32
e429795c	27
f7d7d01b	28
e429795c HY	29	extern unsigned long asmlinkage efi_call_phys(void *, ...);
e429795c HY	30
e429795c HY	31	/*
	32	* Wrap all the virtual calls in a way that forces the parameters on the stack.
	33	*/
	34
982e239c	35	/* Use this macro if your virtual returns a non-void value */
e429795c	36	#define efi_call_virt(f, args...) \
b738c6ea RN	37	({ \
	38	efi_status_t __s; \
	39	kernel_fpu_begin(); \
	40	__s = ((efi_##f##_t __attribute__((regparm(0)))*) \
	41	efi.systab->runtime->f)(args); \
	42	kernel_fpu_end(); \
	43	__s; \
	44	})
e429795c	45
982e239c	46	/* Use this macro if your virtual call does not return any value */
b738c6ea RN	47	#define __efi_call_virt(f, args...) \
	48	({ \
	49	kernel_fpu_begin(); \
	50	((efi_##f##_t __attribute__((regparm(0)))*) \
	51	efi.systab->runtime->f)(args); \
	52	kernel_fpu_end(); \
	53	})
982e239c	54
3e8fa263	55	#define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
e1ad783b	56
5b83683f HY	57	#else /* !CONFIG_X86_32 */
5b83683f HY	58
62fa6e69 MF	59	#define EFI_LOADER_SIGNATURE "EL64"
	60
	61	extern u64 asmlinkage efi_call(void *fp, ...);
	62
	63	#define efi_call_phys(f, args...) efi_call((f), args)
	64
	65	#define efi_call_virt(f, ...) \
d2f7cbe7 BP	66	({ \
	67	efi_status_t __s; \
	68	\
	69	efi_sync_low_kernel_mappings(); \
	70	preempt_disable(); \
de05764e	71	__kernel_fpu_begin(); \
62fa6e69	72	__s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \
de05764e	73	__kernel_fpu_end(); \
d2f7cbe7 BP	74	preempt_enable(); \
	75	__s; \
	76	})
	77
982e239c RN	78	/*
	79	* All X86_64 virt calls return non-void values. Thus, use non-void call for
	80	* virt calls that would be void on X86_32.
	81	*/
	82	#define __efi_call_virt(f, args...) efi_call_virt(f, args)
	83
e1ad783b	84	extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
3e8fa263	85	u32 type, u64 attribute);
e1ad783b	86
5b83683f HY	87	#endif /* CONFIG_X86_32 */
5b83683f HY	88
cbafbc82	89	extern int add_efi_memmap;
d2f7cbe7	90	extern struct efi_scratch efi_scratch;
9cd2b07c	91	extern void efi_set_executable(efi_memory_desc_t *md, bool executable);
1adbfa35	92	extern int efi_memblock_x86_reserve_range(void);
5b83683f HY	93	extern void efi_call_phys_prelog(void);
5b83683f HY	94	extern void efi_call_phys_epilog(void);
5189c2a7	95	extern void efi_unmap_memmap(void);
3e8fa263	96	extern void efi_memory_uc(u64 addr, unsigned long size);
d2f7cbe7	97	extern void __init efi_map_region(efi_memory_desc_t *md);
3b266496	98	extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
d2f7cbe7	99	extern void efi_sync_low_kernel_mappings(void);
b7b898ae BP	100	extern int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
b7b898ae BP	101	extern void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
d2f7cbe7	102	extern void __init old_map_region(efi_memory_desc_t *md);
c55d016f BP	103	extern void __init runtime_code_page_mkexec(void);
c55d016f BP	104	extern void __init efi_runtime_mkexec(void);
11cc8512	105	extern void __init efi_dump_pagetable(void);
a5d90c92	106	extern void __init efi_apply_memmap_quirks(void);
5b83683f	107
1fec0533 DY	108	struct efi_setup_data {
	109	u64 fw_vendor;
	110	u64 runtime;
	111	u64 tables;
	112	u64 smbios;
	113	u64 reserved[8];
	114	};
	115
	116	extern u64 efi_setup;
1fec0533	117
6b59e366 ST	118	#ifdef CONFIG_EFI
	119
	120	static inline bool efi_is_native(void)
	121	{
	122	return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
	123	}
	124
7d453eee MF	125	static inline bool efi_runtime_supported(void)
	126	{
	127	if (efi_is_native())
	128	return true;
	129
	130	if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
	131	return true;
	132
	133	return false;
	134	}
	135
72548e83	136	extern struct console early_efi_console;
5c12af0c	137	extern void parse_efi_setup(u64 phys_addr, u32 data_len);
4f9dbcfc MF	138
	139	#ifdef CONFIG_EFI_MIXED
	140	extern void efi_thunk_runtime_setup(void);
	141	extern efi_status_t efi_thunk_set_virtual_address_map(
	142	void *phys_set_virtual_address_map,
	143	unsigned long memory_map_size,
	144	unsigned long descriptor_size,
	145	u32 descriptor_version,
	146	efi_memory_desc_t *virtual_map);
	147	#else
	148	static inline void efi_thunk_runtime_setup(void) {}
	149	static inline efi_status_t efi_thunk_set_virtual_address_map(
	150	void *phys_set_virtual_address_map,
	151	unsigned long memory_map_size,
	152	unsigned long descriptor_size,
	153	u32 descriptor_version,
	154	efi_memory_desc_t *virtual_map)
	155	{
	156	return EFI_SUCCESS;
	157	}
	158	#endif /* CONFIG_EFI_MIXED */
6b59e366	159	#else
7f594232 RA	160	/*
	161	* IF EFI is not configured, have the EFI calls return -ENOSYS.
	162	*/
	163	#define efi_call0(_f) (-ENOSYS)
	164	#define efi_call1(_f, _a1) (-ENOSYS)
	165	#define efi_call2(_f, _a1, _a2) (-ENOSYS)
	166	#define efi_call3(_f, _a1, _a2, _a3) (-ENOSYS)
	167	#define efi_call4(_f, _a1, _a2, _a3, _a4) (-ENOSYS)
	168	#define efi_call5(_f, _a1, _a2, _a3, _a4, _a5) (-ENOSYS)
	169	#define efi_call6(_f, _a1, _a2, _a3, _a4, _a5, _a6) (-ENOSYS)
5c12af0c	170	static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
7f594232 RA	171	#endif /* CONFIG_EFI */
7f594232 RA	172
1965aae3	173	#endif /* _ASM_X86_EFI_H */