1 #ifndef _ASM_X86_EFI_H 2 #define _ASM_X86_EFI_H 3 4 /* 5 * We map the EFI regions needed for runtime services non-contiguously, 6 * with preserved alignment on virtual addresses starting from -4G down 7 * for a total max space of 64G. This way, we provide for stable runtime 8 * services addresses across kernels so that a kexec'd kernel can still 9 * use them. 10 * 11 * This is the main reason why we're doing stable VA mappings for RT 12 * services. 13 * 14 * This flag is used in conjuction with a chicken bit called 15 * "efi=old_map" which can be used as a fallback to the old runtime 16 * services mapping method in case there's some b0rkage with a 17 * particular EFI implementation (haha, it is hard to hold up the 18 * sarcasm here...). 19 */ 20 #define EFI_OLD_MEMMAP EFI_ARCH_1 21 22 #ifdef CONFIG_X86_32 23 24 #define EFI_LOADER_SIGNATURE "EL32" 25 26 extern unsigned long asmlinkage efi_call_phys(void *, ...); 27 28 #define efi_call_phys0(f) efi_call_phys(f) 29 #define efi_call_phys1(f, a1) efi_call_phys(f, a1) 30 #define efi_call_phys2(f, a1, a2) efi_call_phys(f, a1, a2) 31 #define efi_call_phys3(f, a1, a2, a3) efi_call_phys(f, a1, a2, a3) 32 #define efi_call_phys4(f, a1, a2, a3, a4) \ 33 efi_call_phys(f, a1, a2, a3, a4) 34 #define efi_call_phys5(f, a1, a2, a3, a4, a5) \ 35 efi_call_phys(f, a1, a2, a3, a4, a5) 36 #define efi_call_phys6(f, a1, a2, a3, a4, a5, a6) \ 37 efi_call_phys(f, a1, a2, a3, a4, a5, a6) 38 /* 39 * Wrap all the virtual calls in a way that forces the parameters on the stack. 40 */ 41 42 #define efi_call_virt(f, args...) \ 43 ((efi_##f##_t __attribute__((regparm(0)))*)efi.systab->runtime->f)(args) 44 45 #define efi_call_virt0(f) efi_call_virt(f) 46 #define efi_call_virt1(f, a1) efi_call_virt(f, a1) 47 #define efi_call_virt2(f, a1, a2) efi_call_virt(f, a1, a2) 48 #define efi_call_virt3(f, a1, a2, a3) efi_call_virt(f, a1, a2, a3) 49 #define efi_call_virt4(f, a1, a2, a3, a4) \ 50 efi_call_virt(f, a1, a2, a3, a4) 51 #define efi_call_virt5(f, a1, a2, a3, a4, a5) \ 52 efi_call_virt(f, a1, a2, a3, a4, a5) 53 #define efi_call_virt6(f, a1, a2, a3, a4, a5, a6) \ 54 efi_call_virt(f, a1, a2, a3, a4, a5, a6) 55 56 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size) 57 58 #else /* !CONFIG_X86_32 */ 59 60 #define EFI_LOADER_SIGNATURE "EL64" 61 62 extern u64 efi_call0(void *fp); 63 extern u64 efi_call1(void *fp, u64 arg1); 64 extern u64 efi_call2(void *fp, u64 arg1, u64 arg2); 65 extern u64 efi_call3(void *fp, u64 arg1, u64 arg2, u64 arg3); 66 extern u64 efi_call4(void *fp, u64 arg1, u64 arg2, u64 arg3, u64 arg4); 67 extern u64 efi_call5(void *fp, u64 arg1, u64 arg2, u64 arg3, 68 u64 arg4, u64 arg5); 69 extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3, 70 u64 arg4, u64 arg5, u64 arg6); 71 72 #define efi_call_phys0(f) \ 73 efi_call0((f)) 74 #define efi_call_phys1(f, a1) \ 75 efi_call1((f), (u64)(a1)) 76 #define efi_call_phys2(f, a1, a2) \ 77 efi_call2((f), (u64)(a1), (u64)(a2)) 78 #define efi_call_phys3(f, a1, a2, a3) \ 79 efi_call3((f), (u64)(a1), (u64)(a2), (u64)(a3)) 80 #define efi_call_phys4(f, a1, a2, a3, a4) \ 81 efi_call4((f), (u64)(a1), (u64)(a2), (u64)(a3), \ 82 (u64)(a4)) 83 #define efi_call_phys5(f, a1, a2, a3, a4, a5) \ 84 efi_call5((f), (u64)(a1), (u64)(a2), (u64)(a3), \ 85 (u64)(a4), (u64)(a5)) 86 #define efi_call_phys6(f, a1, a2, a3, a4, a5, a6) \ 87 efi_call6((f), (u64)(a1), (u64)(a2), (u64)(a3), \ 88 (u64)(a4), (u64)(a5), (u64)(a6)) 89 90 #define _efi_call_virtX(x, f, ...) \ 91 ({ \ 92 efi_status_t __s; \ 93 \ 94 efi_sync_low_kernel_mappings(); \ 95 preempt_disable(); \ 96 __s = efi_call##x((void *)efi.systab->runtime->f, __VA_ARGS__); \ 97 preempt_enable(); \ 98 __s; \ 99 }) 100 101 #define efi_call_virt0(f) \ 102 _efi_call_virtX(0, f) 103 #define efi_call_virt1(f, a1) \ 104 _efi_call_virtX(1, f, (u64)(a1)) 105 #define efi_call_virt2(f, a1, a2) \ 106 _efi_call_virtX(2, f, (u64)(a1), (u64)(a2)) 107 #define efi_call_virt3(f, a1, a2, a3) \ 108 _efi_call_virtX(3, f, (u64)(a1), (u64)(a2), (u64)(a3)) 109 #define efi_call_virt4(f, a1, a2, a3, a4) \ 110 _efi_call_virtX(4, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4)) 111 #define efi_call_virt5(f, a1, a2, a3, a4, a5) \ 112 _efi_call_virtX(5, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4), (u64)(a5)) 113 #define efi_call_virt6(f, a1, a2, a3, a4, a5, a6) \ 114 _efi_call_virtX(6, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6)) 115 116 extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size, 117 u32 type, u64 attribute); 118 119 #endif /* CONFIG_X86_32 */ 120 121 extern int add_efi_memmap; 122 extern unsigned long x86_efi_facility; 123 extern struct efi_scratch efi_scratch; 124 extern void efi_set_executable(efi_memory_desc_t *md, bool executable); 125 extern int efi_memblock_x86_reserve_range(void); 126 extern void efi_call_phys_prelog(void); 127 extern void efi_call_phys_epilog(void); 128 extern void efi_unmap_memmap(void); 129 extern void efi_memory_uc(u64 addr, unsigned long size); 130 extern void __init efi_map_region(efi_memory_desc_t *md); 131 extern void __init efi_map_region_fixed(efi_memory_desc_t *md); 132 extern void efi_sync_low_kernel_mappings(void); 133 extern void efi_setup_page_tables(void); 134 extern void __init old_map_region(efi_memory_desc_t *md); 135 extern void __init runtime_code_page_mkexec(void); 136 extern void __init efi_runtime_mkexec(void); 137 extern void __init efi_apply_memmap_quirks(void); 138 139 struct efi_setup_data { 140 u64 fw_vendor; 141 u64 runtime; 142 u64 tables; 143 u64 smbios; 144 u64 reserved[8]; 145 }; 146 147 extern u64 efi_setup; 148 149 #ifdef CONFIG_EFI 150 151 static inline bool efi_is_native(void) 152 { 153 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT); 154 } 155 156 extern struct console early_efi_console; 157 extern void parse_efi_setup(u64 phys_addr, u32 data_len); 158 #else 159 /* 160 * IF EFI is not configured, have the EFI calls return -ENOSYS. 161 */ 162 #define efi_call0(_f) (-ENOSYS) 163 #define efi_call1(_f, _a1) (-ENOSYS) 164 #define efi_call2(_f, _a1, _a2) (-ENOSYS) 165 #define efi_call3(_f, _a1, _a2, _a3) (-ENOSYS) 166 #define efi_call4(_f, _a1, _a2, _a3, _a4) (-ENOSYS) 167 #define efi_call5(_f, _a1, _a2, _a3, _a4, _a5) (-ENOSYS) 168 #define efi_call6(_f, _a1, _a2, _a3, _a4, _a5, _a6) (-ENOSYS) 169 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {} 170 #endif /* CONFIG_EFI */ 171 172 #endif /* _ASM_X86_EFI_H */ 173