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 *__init efi_ioremap(unsigned long addr, unsigned long size,
  85                                         u32 type, u64 attribute);
  86
  87 #endif /* CONFIG_X86_32 */
  88
  89 extern struct efi_scratch efi_scratch;
  90 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
  91 extern int __init efi_memblock_x86_reserve_range(void);
  92 extern void __init efi_call_phys_prolog(void);
  93 extern void __init efi_call_phys_epilog(void);
  94 extern void __init efi_unmap_memmap(void);
  95 extern void __init efi_memory_uc(u64 addr, unsigned long size);
  96 extern void __init efi_map_region(efi_memory_desc_t *md);
  97 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
  98 extern void efi_sync_low_kernel_mappings(void);
  99 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 100 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 101 extern void __init old_map_region(efi_memory_desc_t *md);
 102 extern void __init runtime_code_page_mkexec(void);
 103 extern void __init efi_runtime_mkexec(void);
 104 extern void __init efi_dump_pagetable(void);
 105 extern void __init efi_apply_memmap_quirks(void);
 106 extern int __init efi_reuse_config(u64 tables, int nr_tables);
 107 extern void efi_delete_dummy_variable(void);
 108
 109 struct efi_setup_data {
 110         u64 fw_vendor;
 111         u64 runtime;
 112         u64 tables;
 113         u64 smbios;
 114         u64 reserved[8];
 115 };
 116
 117 extern u64 efi_setup;
 118
 119 #ifdef CONFIG_EFI
 120
 121 static inline bool efi_is_native(void)
 122 {
 123         return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
 124 }
 125
 126 static inline bool efi_runtime_supported(void)
 127 {
 128         if (efi_is_native())
 129                 return true;
 130
 131         if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
 132                 return true;
 133
 134         return false;
 135 }
 136
 137 extern struct console early_efi_console;
 138 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
 139
 140 #ifdef CONFIG_EFI_MIXED
 141 extern void efi_thunk_runtime_setup(void);
 142 extern efi_status_t efi_thunk_set_virtual_address_map(
 143         void *phys_set_virtual_address_map,
 144         unsigned long memory_map_size,
 145         unsigned long descriptor_size,
 146         u32 descriptor_version,
 147         efi_memory_desc_t *virtual_map);
 148 #else
 149 static inline void efi_thunk_runtime_setup(void) {}
 150 static inline efi_status_t efi_thunk_set_virtual_address_map(
 151         void *phys_set_virtual_address_map,
 152         unsigned long memory_map_size,
 153         unsigned long descriptor_size,
 154         u32 descriptor_version,
 155         efi_memory_desc_t *virtual_map)
 156 {
 157         return EFI_SUCCESS;
 158 }
 159 #endif /* CONFIG_EFI_MIXED */
 160
 161
 162 /* arch specific definitions used by the stub code */
 163
 164 struct efi_config {
 165         u64 image_handle;
 166         u64 table;
 167         u64 allocate_pool;
 168         u64 allocate_pages;
 169         u64 get_memory_map;
 170         u64 free_pool;
 171         u64 free_pages;
 172         u64 locate_handle;
 173         u64 handle_protocol;
 174         u64 exit_boot_services;
 175         u64 text_output;
 176         efi_status_t (*call)(unsigned long, ...);
 177         bool is64;
 178 } __packed;
 179
 180 __pure const struct efi_config *__efi_early(void);
 181
 182 #define efi_call_early(f, ...)                                          \
 183         __efi_early()->call(__efi_early()->f, __VA_ARGS__);
 184
 185 extern bool efi_reboot_required(void);
 186
 187 #else
 188 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
 189 static inline bool efi_reboot_required(void)
 190 {
 191         return false;
 192 }
 193 #endif /* CONFIG_EFI */
 194
 195 #endif /* _ASM_X86_EFI_H */