[deliverable/linux.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(p, f, args...)				\
({									\
	((efi_##f##_t __attribute__((regparm(0)))*) p->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(p, f, args...)				\
	efi_call((void *)p->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 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	*/
80e75596	44	#define arch_efi_call_virt(p, f, args...) \
b738c6ea	45	({ \
80e75596	46	((efi_##f##_t __attribute__((regparm(0)))*) p->f)(args); \
b738c6ea	47	})
982e239c	48
3e8fa263	49	#define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
e1ad783b	50
5b83683f HY	51	#else /* !CONFIG_X86_32 */
5b83683f HY	52
62fa6e69 MF	53	#define EFI_LOADER_SIGNATURE "EL64"
	54
	55	extern u64 asmlinkage efi_call(void *fp, ...);
	56
	57	#define efi_call_phys(f, args...) efi_call((f), args)
	58
c9f2a9a6 MF	59	/*
	60	* Scratch space used for switching the pagetable in the EFI stub
	61	*/
	62	struct efi_scratch {
	63	u64 r15;
	64	u64 prev_cr3;
	65	pgd_t *efi_pgt;
	66	bool use_pgd;
	67	u64 phys_stack;
	68	} __packed;
	69
bc25f9db	70	#define arch_efi_call_virt_setup() \
d2f7cbe7	71	({ \
d2f7cbe7 BP	72	efi_sync_low_kernel_mappings(); \
d2f7cbe7 BP	73	preempt_disable(); \
de05764e	74	__kernel_fpu_begin(); \
c9f2a9a6 MF	75	\
	76	if (efi_scratch.use_pgd) { \
	77	efi_scratch.prev_cr3 = read_cr3(); \
	78	write_cr3((unsigned long)efi_scratch.efi_pgt); \
	79	__flush_tlb_all(); \
	80	} \
bc25f9db MR	81	})
bc25f9db MR	82
80e75596 AT	83	#define arch_efi_call_virt(p, f, args...) \
80e75596 AT	84	efi_call((void *)p->f, args) \
bc25f9db MR	85
	86	#define arch_efi_call_virt_teardown() \
	87	({ \
c9f2a9a6 MF	88	if (efi_scratch.use_pgd) { \
	89	write_cr3(efi_scratch.prev_cr3); \
	90	__flush_tlb_all(); \
	91	} \
	92	\
de05764e	93	__kernel_fpu_end(); \
d2f7cbe7	94	preempt_enable(); \
d2f7cbe7 BP	95	})
d2f7cbe7 BP	96
4e78eb05 MK	97	extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
4e78eb05 MK	98	u32 type, u64 attribute);
e1ad783b	99
a523841e	100	#ifdef CONFIG_KASAN
769a8089 AR	101	/*
	102	* CONFIG_KASAN may redefine memset to __memset. __memset function is present
	103	* only in kernel binary. Since the EFI stub linked into a separate binary it
	104	* doesn't have __memset(). So we should use standard memset from
	105	* arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove.
	106	*/
	107	#undef memcpy
	108	#undef memset
	109	#undef memmove
a523841e	110	#endif
769a8089	111
5b83683f HY	112	#endif /* CONFIG_X86_32 */
5b83683f HY	113
d2f7cbe7	114	extern struct efi_scratch efi_scratch;
4e78eb05 MK	115	extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
4e78eb05 MK	116	extern int __init efi_memblock_x86_reserve_range(void);
744937b0 IM	117	extern pgd_t * __init efi_call_phys_prolog(void);
744937b0 IM	118	extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
0bbea1ce	119	extern void __init efi_print_memmap(void);
4e78eb05 MK	120	extern void __init efi_unmap_memmap(void);
4e78eb05 MK	121	extern void __init efi_memory_uc(u64 addr, unsigned long size);
d2f7cbe7	122	extern void __init efi_map_region(efi_memory_desc_t *md);
3b266496	123	extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
d2f7cbe7	124	extern void efi_sync_low_kernel_mappings(void);
67a9108e	125	extern int __init efi_alloc_page_tables(void);
4e78eb05	126	extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
d2f7cbe7	127	extern void __init old_map_region(efi_memory_desc_t *md);
c55d016f	128	extern void __init runtime_code_page_mkexec(void);
6d0cc887	129	extern void __init efi_runtime_update_mappings(void);
11cc8512	130	extern void __init efi_dump_pagetable(void);
a5d90c92	131	extern void __init efi_apply_memmap_quirks(void);
eeb9db09 ST	132	extern int __init efi_reuse_config(u64 tables, int nr_tables);
eeb9db09 ST	133	extern void efi_delete_dummy_variable(void);
5b83683f	134
1fec0533 DY	135	struct efi_setup_data {
	136	u64 fw_vendor;
	137	u64 runtime;
	138	u64 tables;
	139	u64 smbios;
	140	u64 reserved[8];
	141	};
	142
	143	extern u64 efi_setup;
1fec0533	144
6b59e366 ST	145	#ifdef CONFIG_EFI
	146
	147	static inline bool efi_is_native(void)
	148	{
	149	return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
	150	}
	151
7d453eee MF	152	static inline bool efi_runtime_supported(void)
	153	{
	154	if (efi_is_native())
	155	return true;
	156
	157	if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
	158	return true;
	159
	160	return false;
	161	}
	162
72548e83	163	extern struct console early_efi_console;
5c12af0c	164	extern void parse_efi_setup(u64 phys_addr, u32 data_len);
4f9dbcfc	165
21289ec0 AB	166	extern void efifb_setup_from_dmi(struct screen_info si, const char opt);
21289ec0 AB	167
4f9dbcfc MF	168	#ifdef CONFIG_EFI_MIXED
	169	extern void efi_thunk_runtime_setup(void);
	170	extern efi_status_t efi_thunk_set_virtual_address_map(
	171	void *phys_set_virtual_address_map,
	172	unsigned long memory_map_size,
	173	unsigned long descriptor_size,
	174	u32 descriptor_version,
	175	efi_memory_desc_t *virtual_map);
	176	#else
	177	static inline void efi_thunk_runtime_setup(void) {}
	178	static inline efi_status_t efi_thunk_set_virtual_address_map(
	179	void *phys_set_virtual_address_map,
	180	unsigned long memory_map_size,
	181	unsigned long descriptor_size,
	182	u32 descriptor_version,
	183	efi_memory_desc_t *virtual_map)
	184	{
	185	return EFI_SUCCESS;
	186	}
	187	#endif /* CONFIG_EFI_MIXED */
f23cf8bd	188
243b6754 AB	189
	190	/* arch specific definitions used by the stub code */
	191
	192	struct efi_config {
	193	u64 image_handle;
	194	u64 table;
	195	u64 allocate_pool;
	196	u64 allocate_pages;
	197	u64 get_memory_map;
	198	u64 free_pool;
	199	u64 free_pages;
	200	u64 locate_handle;
	201	u64 handle_protocol;
	202	u64 exit_boot_services;
	203	u64 text_output;
	204	efi_status_t (*call)(unsigned long, ...);
	205	bool is64;
	206	} __packed;
	207
	208	__pure const struct efi_config *__efi_early(void);
	209
	210	#define efi_call_early(f, ...) \
	211	__efi_early()->call(__efi_early()->f, __VA_ARGS__);
	212
2c23b73c AB	213	#define __efi_call_early(f, ...) \
	214	__efi_early()->call((unsigned long)f, __VA_ARGS__);
	215
	216	#define efi_is_64bit() __efi_early()->is64
	217
44be28e9 MF	218	extern bool efi_reboot_required(void);
44be28e9 MF	219
6b59e366	220	#else
5c12af0c	221	static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
44be28e9 MF	222	static inline bool efi_reboot_required(void)
	223	{
	224	return false;
	225	}
7f594232 RA	226	#endif /* CONFIG_EFI */
7f594232 RA	227
1965aae3	228	#endif /* _ASM_X86_EFI_H */