arch/x86/include/asm/efi.h

   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 */