x86/mm/pat: Don't report PAT on CPUs that don't support it
[linux/fpc-iii.git] / arch / x86 / include / asm / efi.h
blob2f77bcefe6b494cf7dcd5f7158cfe3090893c584
1 #ifndef _ASM_X86_EFI_H
2 #define _ASM_X86_EFI_H
4 #include <asm/fpu/api.h>
5 #include <asm/pgtable.h>
6 #include <asm/processor-flags.h>
7 #include <asm/tlb.h>
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.
16 * This is the main reason why we're doing stable VA mappings for RT
17 * services.
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...).
25 #define EFI_OLD_MEMMAP EFI_ARCH_1
27 #define EFI32_LOADER_SIGNATURE "EL32"
28 #define EFI64_LOADER_SIGNATURE "EL64"
30 #define MAX_CMDLINE_ADDRESS UINT_MAX
32 #define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF
34 #ifdef CONFIG_X86_32
36 extern unsigned long asmlinkage efi_call_phys(void *, ...);
38 #define arch_efi_call_virt_setup() kernel_fpu_begin()
39 #define arch_efi_call_virt_teardown() kernel_fpu_end()
42 * Wrap all the virtual calls in a way that forces the parameters on the stack.
44 #define arch_efi_call_virt(p, f, args...) \
45 ({ \
46 ((efi_##f##_t __attribute__((regparm(0)))*) p->f)(args); \
49 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
51 #else /* !CONFIG_X86_32 */
53 #define EFI_LOADER_SIGNATURE "EL64"
55 extern u64 asmlinkage efi_call(void *fp, ...);
57 #define efi_call_phys(f, args...) efi_call((f), args)
60 * Scratch space used for switching the pagetable in the EFI stub
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;
70 #define arch_efi_call_virt_setup() \
71 ({ \
72 efi_sync_low_kernel_mappings(); \
73 preempt_disable(); \
74 __kernel_fpu_begin(); \
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 } \
83 #define arch_efi_call_virt(p, f, args...) \
84 efi_call((void *)p->f, args) \
86 #define arch_efi_call_virt_teardown() \
87 ({ \
88 if (efi_scratch.use_pgd) { \
89 write_cr3(efi_scratch.prev_cr3); \
90 __flush_tlb_all(); \
91 } \
93 __kernel_fpu_end(); \
94 preempt_enable(); \
97 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
98 u32 type, u64 attribute);
100 #ifdef CONFIG_KASAN
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.
107 #undef memcpy
108 #undef memset
109 #undef memmove
110 #endif
112 #endif /* CONFIG_X86_32 */
114 extern struct efi_scratch efi_scratch;
115 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
116 extern int __init efi_memblock_x86_reserve_range(void);
117 extern pgd_t * __init efi_call_phys_prolog(void);
118 extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
119 extern void __init efi_print_memmap(void);
120 extern void __init efi_memory_uc(u64 addr, unsigned long size);
121 extern void __init efi_map_region(efi_memory_desc_t *md);
122 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
123 extern void efi_sync_low_kernel_mappings(void);
124 extern int __init efi_alloc_page_tables(void);
125 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
126 extern void __init old_map_region(efi_memory_desc_t *md);
127 extern void __init runtime_code_page_mkexec(void);
128 extern void __init efi_runtime_update_mappings(void);
129 extern void __init efi_dump_pagetable(void);
130 extern void __init efi_apply_memmap_quirks(void);
131 extern int __init efi_reuse_config(u64 tables, int nr_tables);
132 extern void efi_delete_dummy_variable(void);
134 struct efi_setup_data {
135 u64 fw_vendor;
136 u64 runtime;
137 u64 tables;
138 u64 smbios;
139 u64 reserved[8];
142 extern u64 efi_setup;
144 #ifdef CONFIG_EFI
146 static inline bool efi_is_native(void)
148 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
151 static inline bool efi_runtime_supported(void)
153 if (efi_is_native())
154 return true;
156 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
157 return true;
159 return false;
162 extern struct console early_efi_console;
163 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
165 extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
167 #ifdef CONFIG_EFI_MIXED
168 extern void efi_thunk_runtime_setup(void);
169 extern efi_status_t efi_thunk_set_virtual_address_map(
170 void *phys_set_virtual_address_map,
171 unsigned long memory_map_size,
172 unsigned long descriptor_size,
173 u32 descriptor_version,
174 efi_memory_desc_t *virtual_map);
175 #else
176 static inline void efi_thunk_runtime_setup(void) {}
177 static inline efi_status_t efi_thunk_set_virtual_address_map(
178 void *phys_set_virtual_address_map,
179 unsigned long memory_map_size,
180 unsigned long descriptor_size,
181 u32 descriptor_version,
182 efi_memory_desc_t *virtual_map)
184 return EFI_SUCCESS;
186 #endif /* CONFIG_EFI_MIXED */
189 /* arch specific definitions used by the stub code */
191 struct efi_config {
192 u64 image_handle;
193 u64 table;
194 u64 runtime_services;
195 u64 boot_services;
196 u64 text_output;
197 efi_status_t (*call)(unsigned long, ...);
198 bool is64;
199 } __packed;
201 __pure const struct efi_config *__efi_early(void);
203 static inline bool efi_is_64bit(void)
205 if (!IS_ENABLED(CONFIG_X86_64))
206 return false;
208 if (!IS_ENABLED(CONFIG_EFI_MIXED))
209 return true;
211 return __efi_early()->is64;
214 #define efi_table_attr(table, attr, instance) \
215 (efi_is_64bit() ? \
216 ((table##_64_t *)(unsigned long)instance)->attr : \
217 ((table##_32_t *)(unsigned long)instance)->attr)
219 #define efi_call_proto(protocol, f, instance, ...) \
220 __efi_early()->call(efi_table_attr(protocol, f, instance), \
221 instance, ##__VA_ARGS__)
223 #define efi_call_early(f, ...) \
224 __efi_early()->call(efi_table_attr(efi_boot_services, f, \
225 __efi_early()->boot_services), __VA_ARGS__)
227 #define __efi_call_early(f, ...) \
228 __efi_early()->call((unsigned long)f, __VA_ARGS__);
230 #define efi_call_runtime(f, ...) \
231 __efi_early()->call(efi_table_attr(efi_runtime_services, f, \
232 __efi_early()->runtime_services), __VA_ARGS__)
234 extern bool efi_reboot_required(void);
236 #else
237 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
238 static inline bool efi_reboot_required(void)
240 return false;
242 #endif /* CONFIG_EFI */
244 #endif /* _ASM_X86_EFI_H */