kernel/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 #include <asm/pgtable.h>
   6
   7 /*
   8  * We map the EFI regions needed for runtime services non-contiguously,
   9  * with preserved alignment on virtual addresses starting from -4G down
  10  * for a total max space of 64G. This way, we provide for stable runtime
  11  * services addresses across kernels so that a kexec'd kernel can still
  12  * use them.
  13  *
  14  * This is the main reason why we're doing stable VA mappings for RT
  15  * services.
  16  *
  17  * This flag is used in conjuction with a chicken bit called
  18  * "efi=old_map" which can be used as a fallback to the old runtime
  19  * services mapping method in case there's some b0rkage with a
  20  * particular EFI implementation (haha, it is hard to hold up the
  21  * sarcasm here...).
  22  */
  23 #define EFI_OLD_MEMMAP          EFI_ARCH_1
  24
  25 #define EFI32_LOADER_SIGNATURE  "EL32"
  26 #define EFI64_LOADER_SIGNATURE  "EL64"
  27
  28 #ifdef CONFIG_X86_32
  29
  30
  31 extern unsigned long asmlinkage efi_call_phys(void *, ...);
  32
  33 /*
  34  * Wrap all the virtual calls in a way that forces the parameters on the stack.
  35  */
  36
  37 /* Use this macro if your virtual returns a non-void value */
  38 #define efi_call_virt(f, args...) \
  39 ({                                                                      \
  40         efi_status_t __s;                                               \
  41         kernel_fpu_begin();                                             \
  42         __s = ((efi_##f##_t __attribute__((regparm(0)))*)               \
  43                 efi.systab->runtime->f)(args);                          \
  44         kernel_fpu_end();                                               \
  45         __s;                                                            \
  46 })
  47
  48 /* Use this macro if your virtual call does not return any value */
  49 #define __efi_call_virt(f, args...) \
  50 ({                                                                      \
  51         kernel_fpu_begin();                                             \
  52         ((efi_##f##_t __attribute__((regparm(0)))*)                     \
  53                 efi.systab->runtime->f)(args);                          \
  54         kernel_fpu_end();                                               \
  55 })
  56
  57 #define efi_ioremap(addr, size, type, attr)     ioremap_cache(addr, size)
  58
  59 #else /* !CONFIG_X86_32 */
  60
  61 #define EFI_LOADER_SIGNATURE    "EL64"
  62
  63 extern u64 asmlinkage efi_call(void *fp, ...);
  64
  65 #define efi_call_phys(f, args...)               efi_call((f), args)
  66
  67 #define efi_call_virt(f, ...)                                           \
  68 ({                                                                      \
  69         efi_status_t __s;                                               \
  70                                                                         \
  71         efi_sync_low_kernel_mappings();                                 \
  72         preempt_disable();                                              \
  73         __kernel_fpu_begin();                                           \
  74         __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__);    \
  75         __kernel_fpu_end();                                             \
  76         preempt_enable();                                               \
  77         __s;                                                            \
  78 })
  79
  80 /*
  81  * All X86_64 virt calls return non-void values. Thus, use non-void call for
  82  * virt calls that would be void on X86_32.
  83  */
  84 #define __efi_call_virt(f, args...) efi_call_virt(f, args)
  85
  86 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
  87                                         u32 type, u64 attribute);
  88
  89 #endif /* CONFIG_X86_32 */
  90
  91 extern struct efi_scratch efi_scratch;
  92 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
  93 extern int __init efi_memblock_x86_reserve_range(void);
  94 extern pgd_t * __init efi_call_phys_prolog(void);
  95 extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
  96 extern void __init efi_unmap_memmap(void);
  97 extern void __init efi_memory_uc(u64 addr, unsigned long size);
  98 extern void __init efi_map_region(efi_memory_desc_t *md);
  99 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
 100 extern void efi_sync_low_kernel_mappings(void);
 101 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 102 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 103 extern void __init old_map_region(efi_memory_desc_t *md);
 104 extern void __init runtime_code_page_mkexec(void);
 105 extern void __init efi_runtime_mkexec(void);
 106 extern void __init efi_dump_pagetable(void);
 107 extern void __init efi_apply_memmap_quirks(void);
 108 extern int __init efi_reuse_config(u64 tables, int nr_tables);
 109 extern void efi_delete_dummy_variable(void);
 110
 111 struct efi_setup_data {
 112         u64 fw_vendor;
 113         u64 runtime;
 114         u64 tables;
 115         u64 smbios;
 116         u64 reserved[8];
 117 };
 118
 119 extern u64 efi_setup;
 120
 121 #ifdef CONFIG_EFI
 122
 123 static inline bool efi_is_native(void)
 124 {
 125         return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
 126 }
 127
 128 static inline bool efi_runtime_supported(void)
 129 {
 130         if (efi_is_native())
 131                 return true;
 132
 133         if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
 134                 return true;
 135
 136         return false;
 137 }
 138
 139 extern struct console early_efi_console;
 140 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
 141
 142 #ifdef CONFIG_EFI_MIXED
 143 extern void efi_thunk_runtime_setup(void);
 144 extern efi_status_t efi_thunk_set_virtual_address_map(
 145         void *phys_set_virtual_address_map,
 146         unsigned long memory_map_size,
 147         unsigned long descriptor_size,
 148         u32 descriptor_version,
 149         efi_memory_desc_t *virtual_map);
 150 #else
 151 static inline void efi_thunk_runtime_setup(void) {}
 152 static inline efi_status_t efi_thunk_set_virtual_address_map(
 153         void *phys_set_virtual_address_map,
 154         unsigned long memory_map_size,
 155         unsigned long descriptor_size,
 156         u32 descriptor_version,
 157         efi_memory_desc_t *virtual_map)
 158 {
 159         return EFI_SUCCESS;
 160 }
 161 #endif /* CONFIG_EFI_MIXED */
 162
 163
 164 /* arch specific definitions used by the stub code */
 165
 166 struct efi_config {
 167         u64 image_handle;
 168         u64 table;
 169         u64 allocate_pool;
 170         u64 allocate_pages;
 171         u64 get_memory_map;
 172         u64 free_pool;
 173         u64 free_pages;
 174         u64 locate_handle;
 175         u64 handle_protocol;
 176         u64 exit_boot_services;
 177         u64 text_output;
 178         efi_status_t (*call)(unsigned long, ...);
 179         bool is64;
 180 } __packed;
 181
 182 __pure const struct efi_config *__efi_early(void);
 183
 184 #define efi_call_early(f, ...)                                          \
 185         __efi_early()->call(__efi_early()->f, __VA_ARGS__);
 186
 187 extern bool efi_reboot_required(void);
 188
 189 #else
 190 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
 191 static inline bool efi_reboot_required(void)
 192 {
 193         return false;
 194 }
 195 #endif /* CONFIG_EFI */
 196
 197 #endif /* _ASM_X86_EFI_H */