[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 *__init efi_ioremap(unsigned long addr, unsigned long size,
					u32 type, u64 attribute);

#endif /* CONFIG_X86_32 */

extern struct efi_scratch efi_scratch;
extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
extern int __init efi_memblock_x86_reserve_range(void);
extern void __init efi_call_phys_prolog(void);
extern void __init efi_call_phys_epilog(void);
extern void __init efi_unmap_memmap(void);
extern void __init 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 __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
extern void __init 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;

__pure const struct efi_config *__efi_early(void);

#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
4e78eb05 MK	84	extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
4e78eb05 MK	85	u32 type, u64 attribute);
e1ad783b	86
5b83683f HY	87	#endif /* CONFIG_X86_32 */
5b83683f HY	88
d2f7cbe7	89	extern struct efi_scratch efi_scratch;
4e78eb05 MK	90	extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
	91	extern int __init efi_memblock_x86_reserve_range(void);
	92	extern void __init efi_call_phys_prolog(void);
	93	extern void __init efi_call_phys_epilog(void);
	94	extern void __init efi_unmap_memmap(void);
	95	extern void __init efi_memory_uc(u64 addr, unsigned long size);
d2f7cbe7	96	extern void __init efi_map_region(efi_memory_desc_t *md);
3b266496	97	extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
d2f7cbe7	98	extern void efi_sync_low_kernel_mappings(void);
4e78eb05 MK	99	extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
4e78eb05 MK	100	extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
d2f7cbe7	101	extern void __init old_map_region(efi_memory_desc_t *md);
c55d016f BP	102	extern void __init runtime_code_page_mkexec(void);
c55d016f BP	103	extern void __init efi_runtime_mkexec(void);
11cc8512	104	extern void __init efi_dump_pagetable(void);
a5d90c92	105	extern void __init efi_apply_memmap_quirks(void);
eeb9db09 ST	106	extern int __init efi_reuse_config(u64 tables, int nr_tables);
eeb9db09 ST	107	extern void efi_delete_dummy_variable(void);
5b83683f	108
1fec0533 DY	109	struct efi_setup_data {
	110	u64 fw_vendor;
	111	u64 runtime;
	112	u64 tables;
	113	u64 smbios;
	114	u64 reserved[8];
	115	};
	116
	117	extern u64 efi_setup;
1fec0533	118
6b59e366 ST	119	#ifdef CONFIG_EFI
	120
	121	static inline bool efi_is_native(void)
	122	{
	123	return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
	124	}
	125
7d453eee MF	126	static inline bool efi_runtime_supported(void)
	127	{
	128	if (efi_is_native())
	129	return true;
	130
	131	if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
	132	return true;
	133
	134	return false;
	135	}
	136
72548e83	137	extern struct console early_efi_console;
5c12af0c	138	extern void parse_efi_setup(u64 phys_addr, u32 data_len);
4f9dbcfc MF	139
	140	#ifdef CONFIG_EFI_MIXED
	141	extern void efi_thunk_runtime_setup(void);
	142	extern efi_status_t efi_thunk_set_virtual_address_map(
	143	void *phys_set_virtual_address_map,
	144	unsigned long memory_map_size,
	145	unsigned long descriptor_size,
	146	u32 descriptor_version,
	147	efi_memory_desc_t *virtual_map);
	148	#else
	149	static inline void efi_thunk_runtime_setup(void) {}
	150	static inline efi_status_t efi_thunk_set_virtual_address_map(
	151	void *phys_set_virtual_address_map,
	152	unsigned long memory_map_size,
	153	unsigned long descriptor_size,
	154	u32 descriptor_version,
	155	efi_memory_desc_t *virtual_map)
	156	{
	157	return EFI_SUCCESS;
	158	}
	159	#endif /* CONFIG_EFI_MIXED */
f23cf8bd	160
243b6754 AB	161
	162	/* arch specific definitions used by the stub code */
	163
	164	struct efi_config {
	165	u64 image_handle;
	166	u64 table;
	167	u64 allocate_pool;
	168	u64 allocate_pages;
	169	u64 get_memory_map;
	170	u64 free_pool;
	171	u64 free_pages;
	172	u64 locate_handle;
	173	u64 handle_protocol;
	174	u64 exit_boot_services;
	175	u64 text_output;
	176	efi_status_t (*call)(unsigned long, ...);
	177	bool is64;
	178	} __packed;
	179
	180	__pure const struct efi_config *__efi_early(void);
	181
	182	#define efi_call_early(f, ...) \
	183	__efi_early()->call(__efi_early()->f, __VA_ARGS__);
	184
44be28e9 MF	185	extern bool efi_reboot_required(void);
44be28e9 MF	186
6b59e366	187	#else
5c12af0c	188	static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
44be28e9 MF	189	static inline bool efi_reboot_required(void)
	190	{
	191	return false;
	192	}
7f594232 RA	193	#endif /* CONFIG_EFI */
7f594232 RA	194
1965aae3	195	#endif /* _ASM_X86_EFI_H */