[linux-2.6-block.git] / arch / x86 / include / asm / efi.h

#ifndef _ASM_X86_EFI_H
#define _ASM_X86_EFI_H

#include <asm/fpu/api.h>
#include <asm/pgtable.h>
#include <asm/processor-flags.h>
#include <asm/tlb.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"

#define MAX_CMDLINE_ADDRESS	UINT_MAX

#define ARCH_EFI_IRQ_FLAGS_MASK	X86_EFLAGS_IF

#ifdef CONFIG_X86_32

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

#define arch_efi_call_virt_setup()	kernel_fpu_begin()
#define arch_efi_call_virt_teardown()	kernel_fpu_end()

/*
 * Wrap all the virtual calls in a way that forces the parameters on the stack.
 */
#define arch_efi_call_virt(f, args...)					\
({									\
	((efi_##f##_t __attribute__((regparm(0)))*)			\
		efi.systab->runtime->f)(args);				\
})

#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)

/*
 * Scratch space used for switching the pagetable in the EFI stub
 */
struct efi_scratch {
	u64	r15;
	u64	prev_cr3;
	pgd_t	*efi_pgt;
	bool	use_pgd;
	u64	phys_stack;
} __packed;

#define arch_efi_call_virt_setup()					\
({									\
	efi_sync_low_kernel_mappings();					\
	preempt_disable();						\
	__kernel_fpu_begin();						\
									\
	if (efi_scratch.use_pgd) {					\
		efi_scratch.prev_cr3 = read_cr3();			\
		write_cr3((unsigned long)efi_scratch.efi_pgt);		\
		__flush_tlb_all();					\
	}								\
})

#define arch_efi_call_virt(f, args...)					\
	efi_call((void *)efi.systab->runtime->f, args)			\

#define arch_efi_call_virt_teardown()					\
({									\
	if (efi_scratch.use_pgd) {					\
		write_cr3(efi_scratch.prev_cr3);			\
		__flush_tlb_all();					\
	}								\
									\
	__kernel_fpu_end();						\
	preempt_enable();						\
})

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

#ifdef CONFIG_KASAN
/*
 * CONFIG_KASAN may redefine memset to __memset.  __memset function is present
 * only in kernel binary.  Since the EFI stub linked into a separate binary it
 * doesn't have __memset().  So we should use standard memset from
 * arch/x86/boot/compressed/string.c.  The same applies to memcpy and memmove.
 */
#undef memcpy
#undef memset
#undef memmove
#endif

#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 pgd_t * __init efi_call_phys_prolog(void);
extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
extern void __init efi_print_memmap(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_alloc_page_tables(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_update_mappings(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);

extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt);

#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__);

#define __efi_call_early(f, ...)					\
	__efi_early()->call((unsigned long)f, __VA_ARGS__);

#define efi_is_64bit()		__efi_early()->is64

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
df6b35f4	4	#include <asm/fpu/api.h>
744937b0	5	#include <asm/pgtable.h>
9788375d	6	#include <asm/processor-flags.h>
c9f2a9a6	7	#include <asm/tlb.h>
744937b0	8
d2f7cbe7 BP	9	/*
	10	* We map the EFI regions needed for runtime services non-contiguously,
	11	* with preserved alignment on virtual addresses starting from -4G down
	12	* for a total max space of 64G. This way, we provide for stable runtime
	13	* services addresses across kernels so that a kexec'd kernel can still
	14	* use them.
	15	*
	16	* This is the main reason why we're doing stable VA mappings for RT
	17	* services.
	18	*
	19	* This flag is used in conjuction with a chicken bit called
	20	* "efi=old_map" which can be used as a fallback to the old runtime
	21	* services mapping method in case there's some b0rkage with a
	22	* particular EFI implementation (haha, it is hard to hold up the
	23	* sarcasm here...).
	24	*/
	25	#define EFI_OLD_MEMMAP EFI_ARCH_1
	26
b8ff87a6 MF	27	#define EFI32_LOADER_SIGNATURE "EL32"
	28	#define EFI64_LOADER_SIGNATURE "EL64"
	29
48fcb2d0 AB	30	#define MAX_CMDLINE_ADDRESS UINT_MAX
48fcb2d0 AB	31
9788375d	32	#define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF
e429795c	33
9788375d	34	#ifdef CONFIG_X86_32
f7d7d01b	35
e429795c HY	36	extern unsigned long asmlinkage efi_call_phys(void *, ...);
e429795c HY	37
bc25f9db MR	38	#define arch_efi_call_virt_setup() kernel_fpu_begin()
	39	#define arch_efi_call_virt_teardown() kernel_fpu_end()
	40
e429795c HY	41	/*
	42	* Wrap all the virtual calls in a way that forces the parameters on the stack.
	43	*/
bc25f9db	44	#define arch_efi_call_virt(f, args...) \
b738c6ea	45	({ \
b738c6ea RN	46	((efi_##f##_t __attribute__((regparm(0)))*) \
b738c6ea RN	47	efi.systab->runtime->f)(args); \
b738c6ea	48	})
982e239c	49
3e8fa263	50	#define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
e1ad783b	51
5b83683f HY	52	#else /* !CONFIG_X86_32 */
5b83683f HY	53
62fa6e69 MF	54	#define EFI_LOADER_SIGNATURE "EL64"
	55
	56	extern u64 asmlinkage efi_call(void *fp, ...);
	57
	58	#define efi_call_phys(f, args...) efi_call((f), args)
	59
c9f2a9a6 MF	60	/*
	61	* Scratch space used for switching the pagetable in the EFI stub
	62	*/
	63	struct efi_scratch {
	64	u64 r15;
	65	u64 prev_cr3;
	66	pgd_t *efi_pgt;
	67	bool use_pgd;
	68	u64 phys_stack;
	69	} __packed;
	70
bc25f9db	71	#define arch_efi_call_virt_setup() \
d2f7cbe7	72	({ \
d2f7cbe7 BP	73	efi_sync_low_kernel_mappings(); \
d2f7cbe7 BP	74	preempt_disable(); \
de05764e	75	__kernel_fpu_begin(); \
c9f2a9a6 MF	76	\
	77	if (efi_scratch.use_pgd) { \
	78	efi_scratch.prev_cr3 = read_cr3(); \
	79	write_cr3((unsigned long)efi_scratch.efi_pgt); \
	80	__flush_tlb_all(); \
	81	} \
bc25f9db MR	82	})
	83
	84	#define arch_efi_call_virt(f, args...) \
	85	efi_call((void *)efi.systab->runtime->f, args) \
	86
	87	#define arch_efi_call_virt_teardown() \
	88	({ \
c9f2a9a6 MF	89	if (efi_scratch.use_pgd) { \
	90	write_cr3(efi_scratch.prev_cr3); \
	91	__flush_tlb_all(); \
	92	} \
	93	\
de05764e	94	__kernel_fpu_end(); \
d2f7cbe7	95	preempt_enable(); \
d2f7cbe7 BP	96	})
d2f7cbe7 BP	97
4e78eb05 MK	98	extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
4e78eb05 MK	99	u32 type, u64 attribute);
e1ad783b	100
a523841e	101	#ifdef CONFIG_KASAN
769a8089 AR	102	/*
	103	* CONFIG_KASAN may redefine memset to __memset. __memset function is present
	104	* only in kernel binary. Since the EFI stub linked into a separate binary it
	105	* doesn't have __memset(). So we should use standard memset from
	106	* arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove.
	107	*/
	108	#undef memcpy
	109	#undef memset
	110	#undef memmove
a523841e	111	#endif
769a8089	112
5b83683f HY	113	#endif /* CONFIG_X86_32 */
5b83683f HY	114
d2f7cbe7	115	extern struct efi_scratch efi_scratch;
4e78eb05 MK	116	extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
4e78eb05 MK	117	extern int __init efi_memblock_x86_reserve_range(void);
744937b0 IM	118	extern pgd_t * __init efi_call_phys_prolog(void);
744937b0 IM	119	extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
0bbea1ce	120	extern void __init efi_print_memmap(void);
4e78eb05 MK	121	extern void __init efi_unmap_memmap(void);
4e78eb05 MK	122	extern void __init efi_memory_uc(u64 addr, unsigned long size);
d2f7cbe7	123	extern void __init efi_map_region(efi_memory_desc_t *md);
3b266496	124	extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
d2f7cbe7	125	extern void efi_sync_low_kernel_mappings(void);
67a9108e	126	extern int __init efi_alloc_page_tables(void);
4e78eb05 MK	127	extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
4e78eb05 MK	128	extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
d2f7cbe7	129	extern void __init old_map_region(efi_memory_desc_t *md);
c55d016f	130	extern void __init runtime_code_page_mkexec(void);
6d0cc887	131	extern void __init efi_runtime_update_mappings(void);
11cc8512	132	extern void __init efi_dump_pagetable(void);
a5d90c92	133	extern void __init efi_apply_memmap_quirks(void);
eeb9db09 ST	134	extern int __init efi_reuse_config(u64 tables, int nr_tables);
eeb9db09 ST	135	extern void efi_delete_dummy_variable(void);
5b83683f	136
1fec0533 DY	137	struct efi_setup_data {
	138	u64 fw_vendor;
	139	u64 runtime;
	140	u64 tables;
	141	u64 smbios;
	142	u64 reserved[8];
	143	};
	144
	145	extern u64 efi_setup;
1fec0533	146
6b59e366 ST	147	#ifdef CONFIG_EFI
	148
	149	static inline bool efi_is_native(void)
	150	{
	151	return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
	152	}
	153
7d453eee MF	154	static inline bool efi_runtime_supported(void)
	155	{
	156	if (efi_is_native())
	157	return true;
	158
	159	if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
	160	return true;
	161
	162	return false;
	163	}
	164
72548e83	165	extern struct console early_efi_console;
5c12af0c	166	extern void parse_efi_setup(u64 phys_addr, u32 data_len);
4f9dbcfc	167
21289ec0 AB	168	extern void efifb_setup_from_dmi(struct screen_info si, const char opt);
21289ec0 AB	169
4f9dbcfc MF	170	#ifdef CONFIG_EFI_MIXED
	171	extern void efi_thunk_runtime_setup(void);
	172	extern efi_status_t efi_thunk_set_virtual_address_map(
	173	void *phys_set_virtual_address_map,
	174	unsigned long memory_map_size,
	175	unsigned long descriptor_size,
	176	u32 descriptor_version,
	177	efi_memory_desc_t *virtual_map);
	178	#else
	179	static inline void efi_thunk_runtime_setup(void) {}
	180	static inline efi_status_t efi_thunk_set_virtual_address_map(
	181	void *phys_set_virtual_address_map,
	182	unsigned long memory_map_size,
	183	unsigned long descriptor_size,
	184	u32 descriptor_version,
	185	efi_memory_desc_t *virtual_map)
	186	{
	187	return EFI_SUCCESS;
	188	}
	189	#endif /* CONFIG_EFI_MIXED */
f23cf8bd	190
243b6754 AB	191
	192	/* arch specific definitions used by the stub code */
	193
	194	struct efi_config {
	195	u64 image_handle;
	196	u64 table;
	197	u64 allocate_pool;
	198	u64 allocate_pages;
	199	u64 get_memory_map;
	200	u64 free_pool;
	201	u64 free_pages;
	202	u64 locate_handle;
	203	u64 handle_protocol;
	204	u64 exit_boot_services;
	205	u64 text_output;
	206	efi_status_t (*call)(unsigned long, ...);
	207	bool is64;
	208	} __packed;
	209
	210	__pure const struct efi_config *__efi_early(void);
	211
	212	#define efi_call_early(f, ...) \
	213	__efi_early()->call(__efi_early()->f, __VA_ARGS__);
	214
2c23b73c AB	215	#define __efi_call_early(f, ...) \
	216	__efi_early()->call((unsigned long)f, __VA_ARGS__);
	217
	218	#define efi_is_64bit() __efi_early()->is64
	219
44be28e9 MF	220	extern bool efi_reboot_required(void);
44be28e9 MF	221
6b59e366	222	#else
5c12af0c	223	static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
44be28e9 MF	224	static inline bool efi_reboot_required(void)
	225	{
	226	return false;
	227	}
7f594232 RA	228	#endif /* CONFIG_EFI */
7f594232 RA	229
1965aae3	230	#endif /* _ASM_X86_EFI_H */