arch/x86/include/asm/efi.h

   1 #ifndef _ASM_X86_EFI_H
   2 #define _ASM_X86_EFI_H
   3
   4 #include <asm/fpu/api.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 #define MAX_CMDLINE_ADDRESS     UINT_MAX
  29
  30 #ifdef CONFIG_X86_32
  31
  32
  33 extern unsigned long asmlinkage efi_call_phys(void *, ...);
  34
  35 /*
  36  * Wrap all the virtual calls in a way that forces the parameters on the stack.
  37  */
  38
  39 /* Use this macro if your virtual returns a non-void value */
  40 #define efi_call_virt(f, args...) \
  41 ({                                                                      \
  42         efi_status_t __s;                                               \
  43         kernel_fpu_begin();                                             \
  44         __s = ((efi_##f##_t __attribute__((regparm(0)))*)               \
  45                 efi.systab->runtime->f)(args);                          \
  46         kernel_fpu_end();                                               \
  47         __s;                                                            \
  48 })
  49
  50 /* Use this macro if your virtual call does not return any value */
  51 #define __efi_call_virt(f, args...) \
  52 ({                                                                      \
  53         kernel_fpu_begin();                                             \
  54         ((efi_##f##_t __attribute__((regparm(0)))*)                     \
  55                 efi.systab->runtime->f)(args);                          \
  56         kernel_fpu_end();                                               \
  57 })
  58
  59 #define efi_ioremap(addr, size, type, attr)     ioremap_cache(addr, size)
  60
  61 #else /* !CONFIG_X86_32 */
  62
  63 #define EFI_LOADER_SIGNATURE    "EL64"
  64
  65 extern u64 asmlinkage efi_call(void *fp, ...);
  66
  67 #define efi_call_phys(f, args...)               efi_call((f), args)
  68
  69 #define efi_call_virt(f, ...)                                           \
  70 ({                                                                      \
  71         efi_status_t __s;                                               \
  72                                                                         \
  73         efi_sync_low_kernel_mappings();                                 \
  74         preempt_disable();                                              \
  75         __kernel_fpu_begin();                                           \
  76         __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__);    \
  77         __kernel_fpu_end();                                             \
  78         preempt_enable();                                               \
  79         __s;                                                            \
  80 })
  81
  82 /*
  83  * All X86_64 virt calls return non-void values. Thus, use non-void call for
  84  * virt calls that would be void on X86_32.
  85  */
  86 #define __efi_call_virt(f, args...) efi_call_virt(f, args)
  87
  88 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
  89                                         u32 type, u64 attribute);
  90
  91 #ifdef CONFIG_KASAN
  92 /*
  93  * CONFIG_KASAN may redefine memset to __memset.  __memset function is present
  94  * only in kernel binary.  Since the EFI stub linked into a separate binary it
  95  * doesn't have __memset().  So we should use standard memset from
  96  * arch/x86/boot/compressed/string.c.  The same applies to memcpy and memmove.
  97  */
  98 #undef memcpy
  99 #undef memset
 100 #undef memmove
 101 #endif
 102
 103 #endif /* CONFIG_X86_32 */
 104
 105 extern struct efi_scratch efi_scratch;
 106 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
 107 extern int __init efi_memblock_x86_reserve_range(void);
 108 extern pgd_t * __init efi_call_phys_prolog(void);
 109 extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
 110 extern void __init efi_print_memmap(void);
 111 extern void __init efi_unmap_memmap(void);
 112 extern void __init efi_memory_uc(u64 addr, unsigned long size);
 113 extern void __init efi_map_region(efi_memory_desc_t *md);
 114 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
 115 extern void efi_sync_low_kernel_mappings(void);
 116 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 117 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 118 extern void __init old_map_region(efi_memory_desc_t *md);
 119 extern void __init runtime_code_page_mkexec(void);
 120 extern void __init efi_runtime_mkexec(void);
 121 extern void __init efi_dump_pagetable(void);
 122 extern void __init efi_apply_memmap_quirks(void);
 123 extern int __init efi_reuse_config(u64 tables, int nr_tables);
 124 extern void efi_delete_dummy_variable(void);
 125
 126 struct efi_setup_data {
 127         u64 fw_vendor;
 128         u64 runtime;
 129         u64 tables;
 130         u64 smbios;
 131         u64 reserved[8];
 132 };
 133
 134 extern u64 efi_setup;
 135
 136 #ifdef CONFIG_EFI
 137
 138 static inline bool efi_is_native(void)
 139 {
 140         return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
 141 }
 142
 143 static inline bool efi_runtime_supported(void)
 144 {
 145         if (efi_is_native())
 146                 return true;
 147
 148         if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
 149                 return true;
 150
 151         return false;
 152 }
 153
 154 extern struct console early_efi_console;
 155 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
 156
 157 #ifdef CONFIG_EFI_MIXED
 158 extern void efi_thunk_runtime_setup(void);
 159 extern efi_status_t efi_thunk_set_virtual_address_map(
 160         void *phys_set_virtual_address_map,
 161         unsigned long memory_map_size,
 162         unsigned long descriptor_size,
 163         u32 descriptor_version,
 164         efi_memory_desc_t *virtual_map);
 165 #else
 166 static inline void efi_thunk_runtime_setup(void) {}
 167 static inline efi_status_t efi_thunk_set_virtual_address_map(
 168         void *phys_set_virtual_address_map,
 169         unsigned long memory_map_size,
 170         unsigned long descriptor_size,
 171         u32 descriptor_version,
 172         efi_memory_desc_t *virtual_map)
 173 {
 174         return EFI_SUCCESS;
 175 }
 176 #endif /* CONFIG_EFI_MIXED */
 177
 178
 179 /* arch specific definitions used by the stub code */
 180
 181 struct efi_config {
 182         u64 image_handle;
 183         u64 table;
 184         u64 allocate_pool;
 185         u64 allocate_pages;
 186         u64 get_memory_map;
 187         u64 free_pool;
 188         u64 free_pages;
 189         u64 locate_handle;
 190         u64 handle_protocol;
 191         u64 exit_boot_services;
 192         u64 text_output;
 193         efi_status_t (*call)(unsigned long, ...);
 194         bool is64;
 195 } __packed;
 196
 197 __pure const struct efi_config *__efi_early(void);
 198
 199 #define efi_call_early(f, ...)                                          \
 200         __efi_early()->call(__efi_early()->f, __VA_ARGS__);
 201
 202 extern bool efi_reboot_required(void);
 203
 204 #else
 205 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
 206 static inline bool efi_reboot_required(void)
 207 {
 208         return false;
 209 }
 210 #endif /* CONFIG_EFI */
 211
 212 #endif /* _ASM_X86_EFI_H */