[linux-2.6-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 */

#define efi_in_nmi()	in_nmi()

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);
extern int __init efi_reuse_config(u64 tables, int nr_tables);
extern void efi_delete_dummy_variable(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 */


/* arch specific definitions used by the stub code */

struct efi_config {
	u64 image_handle;
	u64 table;
	u64 allocate_pool;
	u64 allocate_pages;
	u64 get_memory_map;
	u64 free_pool;
	u64 free_pages;
	u64 locate_handle;
	u64 handle_protocol;
	u64 exit_boot_services;
	u64 text_output;
	efi_status_t (*call)(unsigned long, ...);
	bool is64;
} __packed;

extern struct efi_config *efi_early;

#define efi_call_early(f, ...)						\
	efi_early->call(efi_early->f, __VA_ARGS__);

extern bool efi_reboot_required(void);

#else
static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
static inline bool efi_reboot_required(void)
{
	return false;
}
#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
161485e8 AB	89	#define efi_in_nmi() in_nmi()
161485e8 AB	90
d2f7cbe7	91	extern struct efi_scratch efi_scratch;
9cd2b07c	92	extern void efi_set_executable(efi_memory_desc_t *md, bool executable);
1adbfa35	93	extern int efi_memblock_x86_reserve_range(void);
5b83683f HY	94	extern void efi_call_phys_prelog(void);
5b83683f HY	95	extern void efi_call_phys_epilog(void);
5189c2a7	96	extern void efi_unmap_memmap(void);
3e8fa263	97	extern void efi_memory_uc(u64 addr, unsigned long size);
d2f7cbe7	98	extern void __init efi_map_region(efi_memory_desc_t *md);
3b266496	99	extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
d2f7cbe7	100	extern void efi_sync_low_kernel_mappings(void);
b7b898ae BP	101	extern int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
b7b898ae BP	102	extern void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
d2f7cbe7	103	extern void __init old_map_region(efi_memory_desc_t *md);
c55d016f BP	104	extern void __init runtime_code_page_mkexec(void);
c55d016f BP	105	extern void __init efi_runtime_mkexec(void);
11cc8512	106	extern void __init efi_dump_pagetable(void);
a5d90c92	107	extern void __init efi_apply_memmap_quirks(void);
eeb9db09 ST	108	extern int __init efi_reuse_config(u64 tables, int nr_tables);
eeb9db09 ST	109	extern void efi_delete_dummy_variable(void);
5b83683f	110
1fec0533 DY	111	struct efi_setup_data {
	112	u64 fw_vendor;
	113	u64 runtime;
	114	u64 tables;
	115	u64 smbios;
	116	u64 reserved[8];
	117	};
	118
	119	extern u64 efi_setup;
1fec0533	120
6b59e366 ST	121	#ifdef CONFIG_EFI
	122
	123	static inline bool efi_is_native(void)
	124	{
	125	return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
	126	}
	127
7d453eee MF	128	static inline bool efi_runtime_supported(void)
	129	{
	130	if (efi_is_native())
	131	return true;
	132
	133	if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
	134	return true;
	135
	136	return false;
	137	}
	138
72548e83	139	extern struct console early_efi_console;
5c12af0c	140	extern void parse_efi_setup(u64 phys_addr, u32 data_len);
4f9dbcfc MF	141
	142	#ifdef CONFIG_EFI_MIXED
	143	extern void efi_thunk_runtime_setup(void);
	144	extern efi_status_t efi_thunk_set_virtual_address_map(
	145	void *phys_set_virtual_address_map,
	146	unsigned long memory_map_size,
	147	unsigned long descriptor_size,
	148	u32 descriptor_version,
	149	efi_memory_desc_t *virtual_map);
	150	#else
	151	static inline void efi_thunk_runtime_setup(void) {}
	152	static inline efi_status_t efi_thunk_set_virtual_address_map(
	153	void *phys_set_virtual_address_map,
	154	unsigned long memory_map_size,
	155	unsigned long descriptor_size,
	156	u32 descriptor_version,
	157	efi_memory_desc_t *virtual_map)
	158	{
	159	return EFI_SUCCESS;
	160	}
	161	#endif /* CONFIG_EFI_MIXED */
f23cf8bd AB	162
	163
	164	/* arch specific definitions used by the stub code */
	165
	166	struct efi_config {
	167	u64 image_handle;
	168	u64 table;
	169	u64 allocate_pool;
	170	u64 allocate_pages;
	171	u64 get_memory_map;
	172	u64 free_pool;
	173	u64 free_pages;
	174	u64 locate_handle;
	175	u64 handle_protocol;
	176	u64 exit_boot_services;
	177	u64 text_output;
	178	efi_status_t (*call)(unsigned long, ...);
	179	bool is64;
	180	} __packed;
	181
	182	extern struct efi_config *efi_early;
	183
	184	#define efi_call_early(f, ...) \
	185	efi_early->call(efi_early->f, __VA_ARGS__);
	186
44be28e9 MF	187	extern bool efi_reboot_required(void);
44be28e9 MF	188
6b59e366	189	#else
5c12af0c	190	static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
44be28e9 MF	191	static inline bool efi_reboot_required(void)
	192	{
	193	return false;
	194	}
7f594232 RA	195	#endif /* CONFIG_EFI */
7f594232 RA	196
1965aae3	197	#endif /* _ASM_X86_EFI_H */