| 1 | #ifndef _ASM_X86_EFI_H |
| 2 | #define _ASM_X86_EFI_H |
| 3 | |
| 4 | #include <asm/i387.h> |
| 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 | |
| 23 | #define EFI32_LOADER_SIGNATURE "EL32" |
| 24 | #define EFI64_LOADER_SIGNATURE "EL64" |
| 25 | |
| 26 | #ifdef CONFIG_X86_32 |
| 27 | |
| 28 | |
| 29 | extern unsigned long asmlinkage efi_call_phys(void *, ...); |
| 30 | |
| 31 | /* |
| 32 | * Wrap all the virtual calls in a way that forces the parameters on the stack. |
| 33 | */ |
| 34 | |
| 35 | /* Use this macro if your virtual returns a non-void value */ |
| 36 | #define efi_call_virt(f, args...) \ |
| 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 | }) |
| 45 | |
| 46 | /* Use this macro if your virtual call does not return any value */ |
| 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 | }) |
| 54 | |
| 55 | #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size) |
| 56 | |
| 57 | #else /* !CONFIG_X86_32 */ |
| 58 | |
| 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, ...) \ |
| 66 | ({ \ |
| 67 | efi_status_t __s; \ |
| 68 | \ |
| 69 | efi_sync_low_kernel_mappings(); \ |
| 70 | preempt_disable(); \ |
| 71 | __kernel_fpu_begin(); \ |
| 72 | __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \ |
| 73 | __kernel_fpu_end(); \ |
| 74 | preempt_enable(); \ |
| 75 | __s; \ |
| 76 | }) |
| 77 | |
| 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 | |
| 84 | extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size, |
| 85 | u32 type, u64 attribute); |
| 86 | |
| 87 | #endif /* CONFIG_X86_32 */ |
| 88 | |
| 89 | extern int add_efi_memmap; |
| 90 | extern struct efi_scratch efi_scratch; |
| 91 | extern void efi_set_executable(efi_memory_desc_t *md, bool executable); |
| 92 | extern int efi_memblock_x86_reserve_range(void); |
| 93 | extern void efi_call_phys_prelog(void); |
| 94 | extern void efi_call_phys_epilog(void); |
| 95 | extern void efi_unmap_memmap(void); |
| 96 | extern void efi_memory_uc(u64 addr, unsigned long size); |
| 97 | extern void __init efi_map_region(efi_memory_desc_t *md); |
| 98 | extern void __init efi_map_region_fixed(efi_memory_desc_t *md); |
| 99 | extern void efi_sync_low_kernel_mappings(void); |
| 100 | extern int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages); |
| 101 | extern void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages); |
| 102 | extern void __init old_map_region(efi_memory_desc_t *md); |
| 103 | extern void __init runtime_code_page_mkexec(void); |
| 104 | extern void __init efi_runtime_mkexec(void); |
| 105 | extern void __init efi_dump_pagetable(void); |
| 106 | extern void __init efi_apply_memmap_quirks(void); |
| 107 | |
| 108 | struct efi_setup_data { |
| 109 | u64 fw_vendor; |
| 110 | u64 runtime; |
| 111 | u64 tables; |
| 112 | u64 smbios; |
| 113 | u64 reserved[8]; |
| 114 | }; |
| 115 | |
| 116 | extern u64 efi_setup; |
| 117 | |
| 118 | #ifdef CONFIG_EFI |
| 119 | |
| 120 | static inline bool efi_is_native(void) |
| 121 | { |
| 122 | return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT); |
| 123 | } |
| 124 | |
| 125 | static inline bool efi_runtime_supported(void) |
| 126 | { |
| 127 | if (efi_is_native()) |
| 128 | return true; |
| 129 | |
| 130 | if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP)) |
| 131 | return true; |
| 132 | |
| 133 | return false; |
| 134 | } |
| 135 | |
| 136 | extern struct console early_efi_console; |
| 137 | extern void parse_efi_setup(u64 phys_addr, u32 data_len); |
| 138 | |
| 139 | #ifdef CONFIG_EFI_MIXED |
| 140 | extern void efi_thunk_runtime_setup(void); |
| 141 | extern efi_status_t efi_thunk_set_virtual_address_map( |
| 142 | void *phys_set_virtual_address_map, |
| 143 | unsigned long memory_map_size, |
| 144 | unsigned long descriptor_size, |
| 145 | u32 descriptor_version, |
| 146 | efi_memory_desc_t *virtual_map); |
| 147 | #else |
| 148 | static inline void efi_thunk_runtime_setup(void) {} |
| 149 | static inline efi_status_t efi_thunk_set_virtual_address_map( |
| 150 | void *phys_set_virtual_address_map, |
| 151 | unsigned long memory_map_size, |
| 152 | unsigned long descriptor_size, |
| 153 | u32 descriptor_version, |
| 154 | efi_memory_desc_t *virtual_map) |
| 155 | { |
| 156 | return EFI_SUCCESS; |
| 157 | } |
| 158 | #endif /* CONFIG_EFI_MIXED */ |
| 159 | #else |
| 160 | /* |
| 161 | * IF EFI is not configured, have the EFI calls return -ENOSYS. |
| 162 | */ |
| 163 | #define efi_call0(_f) (-ENOSYS) |
| 164 | #define efi_call1(_f, _a1) (-ENOSYS) |
| 165 | #define efi_call2(_f, _a1, _a2) (-ENOSYS) |
| 166 | #define efi_call3(_f, _a1, _a2, _a3) (-ENOSYS) |
| 167 | #define efi_call4(_f, _a1, _a2, _a3, _a4) (-ENOSYS) |
| 168 | #define efi_call5(_f, _a1, _a2, _a3, _a4, _a5) (-ENOSYS) |
| 169 | #define efi_call6(_f, _a1, _a2, _a3, _a4, _a5, _a6) (-ENOSYS) |
| 170 | static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {} |
| 171 | #endif /* CONFIG_EFI */ |
| 172 | |
| 173 | #endif /* _ASM_X86_EFI_H */ |