arch/x86/include/asm/efi.h

   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 extern int __init efi_reuse_config(u64 tables, int nr_tables);
 108 extern void efi_delete_dummy_variable(void);
 109
 110 struct efi_setup_data {
 111         u64 fw_vendor;
 112         u64 runtime;
 113         u64 tables;
 114         u64 smbios;
 115         u64 reserved[8];
 116 };
 117
 118 extern u64 efi_setup;
 119
 120 #ifdef CONFIG_EFI
 121
 122 static inline bool efi_is_native(void)
 123 {
 124         return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
 125 }
 126
 127 static inline bool efi_runtime_supported(void)
 128 {
 129         if (efi_is_native())
 130                 return true;
 131
 132         if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
 133                 return true;
 134
 135         return false;
 136 }
 137
 138 extern struct console early_efi_console;
 139 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
 140
 141 #ifdef CONFIG_EFI_MIXED
 142 extern void efi_thunk_runtime_setup(void);
 143 extern efi_status_t efi_thunk_set_virtual_address_map(
 144         void *phys_set_virtual_address_map,
 145         unsigned long memory_map_size,
 146         unsigned long descriptor_size,
 147         u32 descriptor_version,
 148         efi_memory_desc_t *virtual_map);
 149 #else
 150 static inline void efi_thunk_runtime_setup(void) {}
 151 static inline efi_status_t efi_thunk_set_virtual_address_map(
 152         void *phys_set_virtual_address_map,
 153         unsigned long memory_map_size,
 154         unsigned long descriptor_size,
 155         u32 descriptor_version,
 156         efi_memory_desc_t *virtual_map)
 157 {
 158         return EFI_SUCCESS;
 159 }
 160 #endif /* CONFIG_EFI_MIXED */
 161
 162 extern bool efi_reboot_required(void);
 163
 164 #else
 165 /*
 166  * IF EFI is not configured, have the EFI calls return -ENOSYS.
 167  */
 168 #define efi_call0(_f)                                   (-ENOSYS)
 169 #define efi_call1(_f, _a1)                              (-ENOSYS)
 170 #define efi_call2(_f, _a1, _a2)                         (-ENOSYS)
 171 #define efi_call3(_f, _a1, _a2, _a3)                    (-ENOSYS)
 172 #define efi_call4(_f, _a1, _a2, _a3, _a4)               (-ENOSYS)
 173 #define efi_call5(_f, _a1, _a2, _a3, _a4, _a5)          (-ENOSYS)
 174 #define efi_call6(_f, _a1, _a2, _a3, _a4, _a5, _a6)     (-ENOSYS)
 175 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
 176 static inline bool efi_reboot_required(void)
 177 {
 178         return false;
 179 }
 180 #endif /* CONFIG_EFI */
 181
 182 #endif /* _ASM_X86_EFI_H */