1#ifndef _ASM_X86_EFI_H
2#define _ASM_X86_EFI_H
3
4#include <asm/i387.h>
5#include <asm/pgtable.h>
6
7/*
8 * We map the EFI regions needed for runtime services non-contiguously,
9 * with preserved alignment on virtual addresses starting from -4G down
10 * for a total max space of 64G. This way, we provide for stable runtime
11 * services addresses across kernels so that a kexec'd kernel can still
12 * use them.
13 *
14 * This is the main reason why we're doing stable VA mappings for RT
15 * services.
16 *
17 * This flag is used in conjuction with a chicken bit called
18 * "efi=old_map" which can be used as a fallback to the old runtime
19 * services mapping method in case there's some b0rkage with a
20 * particular EFI implementation (haha, it is hard to hold up the
21 * sarcasm here...).
22 */
23#define EFI_OLD_MEMMAP		EFI_ARCH_1
24
25#define EFI32_LOADER_SIGNATURE	"EL32"
26#define EFI64_LOADER_SIGNATURE	"EL64"
27
28#ifdef CONFIG_X86_32
29
30
31extern unsigned long asmlinkage efi_call_phys(void *, ...);
32
33/*
34 * Wrap all the virtual calls in a way that forces the parameters on the stack.
35 */
36
37/* Use this macro if your virtual returns a non-void value */
38#define efi_call_virt(f, args...) \
39({									\
40	efi_status_t __s;						\
41	kernel_fpu_begin();						\
42	__s = ((efi_##f##_t __attribute__((regparm(0)))*)		\
43		efi.systab->runtime->f)(args);				\
44	kernel_fpu_end();						\
45	__s;								\
46})
47
48/* Use this macro if your virtual call does not return any value */
49#define __efi_call_virt(f, args...) \
50({									\
51	kernel_fpu_begin();						\
52	((efi_##f##_t __attribute__((regparm(0)))*)			\
53		efi.systab->runtime->f)(args);				\
54	kernel_fpu_end();						\
55})
56
57#define efi_ioremap(addr, size, type, attr)	ioremap_cache(addr, size)
58
59#else /* !CONFIG_X86_32 */
60
61#define EFI_LOADER_SIGNATURE	"EL64"
62
63extern u64 asmlinkage efi_call(void *fp, ...);
64
65#define efi_call_phys(f, args...)		efi_call((f), args)
66
67#define efi_call_virt(f, ...)						\
68({									\
69	efi_status_t __s;						\
70									\
71	efi_sync_low_kernel_mappings();					\
72	preempt_disable();						\
73	__kernel_fpu_begin();						\
74	__s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__);	\
75	__kernel_fpu_end();						\
76	preempt_enable();						\
77	__s;								\
78})
79
80/*
81 * All X86_64 virt calls return non-void values. Thus, use non-void call for
82 * virt calls that would be void on X86_32.
83 */
84#define __efi_call_virt(f, args...) efi_call_virt(f, args)
85
86extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
87					u32 type, u64 attribute);
88
89#endif /* CONFIG_X86_32 */
90
91extern struct efi_scratch efi_scratch;
92extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
93extern int __init efi_memblock_x86_reserve_range(void);
94extern pgd_t * __init efi_call_phys_prolog(void);
95extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
96extern void __init efi_unmap_memmap(void);
97extern void __init efi_memory_uc(u64 addr, unsigned long size);
98extern void __init efi_map_region(efi_memory_desc_t *md);
99extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
100extern void efi_sync_low_kernel_mappings(void);
101extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
102extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
103extern void __init old_map_region(efi_memory_desc_t *md);
104extern void __init runtime_code_page_mkexec(void);
105extern void __init efi_runtime_mkexec(void);
106extern void __init efi_dump_pagetable(void);
107extern void __init efi_apply_memmap_quirks(void);
108extern int __init efi_reuse_config(u64 tables, int nr_tables);
109extern void efi_delete_dummy_variable(void);
110
111struct efi_setup_data {
112	u64 fw_vendor;
113	u64 runtime;
114	u64 tables;
115	u64 smbios;
116	u64 reserved[8];
117};
118
119extern u64 efi_setup;
120
121#ifdef CONFIG_EFI
122
123static inline bool efi_is_native(void)
124{
125	return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
126}
127
128static 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
139extern struct console early_efi_console;
140extern void parse_efi_setup(u64 phys_addr, u32 data_len);
141
142#ifdef CONFIG_EFI_MIXED
143extern void efi_thunk_runtime_setup(void);
144extern 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
151static inline void efi_thunk_runtime_setup(void) {}
152static 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 */
162
163
164/* arch specific definitions used by the stub code */
165
166struct 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__pure const struct efi_config *__efi_early(void);
183
184#define efi_call_early(f, ...)						\
185	__efi_early()->call(__efi_early()->f, __VA_ARGS__);
186
187extern bool efi_reboot_required(void);
188
189#else
190static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
191static inline bool efi_reboot_required(void)
192{
193	return false;
194}
195#endif /* CONFIG_EFI */
196
197#endif /* _ASM_X86_EFI_H */
198