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 #include <asm/nospec-branch.h>
   7
   8 /*
   9  * We map the EFI regions needed for runtime services non-contiguously,
  10  * with preserved alignment on virtual addresses starting from -4G down
  11  * for a total max space of 64G. This way, we provide for stable runtime
  12  * services addresses across kernels so that a kexec'd kernel can still
  13  * use them.
  14  *
  15  * This is the main reason why we're doing stable VA mappings for RT
  16  * services.
  17  *
  18  * This flag is used in conjuction with a chicken bit called
  19  * "efi=old_map" which can be used as a fallback to the old runtime
  20  * services mapping method in case there's some b0rkage with a
  21  * particular EFI implementation (haha, it is hard to hold up the
  22  * sarcasm here...).
  23  */
  24 #define EFI_OLD_MEMMAP          EFI_ARCH_1
  25
  26 #define EFI32_LOADER_SIGNATURE  "EL32"
  27 #define EFI64_LOADER_SIGNATURE  "EL64"
  28
  29 #ifdef CONFIG_X86_32
  30
  31
  32 extern unsigned long asmlinkage efi_call_phys(void *, ...);
  33
  34 /*
  35  * Wrap all the virtual calls in a way that forces the parameters on the stack.
  36  */
  37
  38 /* Use this macro if your virtual returns a non-void value */
  39 #define efi_call_virt(f, args...) \
  40 ({                                                                      \
  41         efi_status_t __s;                                               \
  42         kernel_fpu_begin();                                             \
  43         firmware_restrict_branch_speculation_start();                   \
  44         __s = ((efi_##f##_t __attribute__((regparm(0)))*)               \
  45                 efi.systab->runtime->f)(args);                          \
  46         firmware_restrict_branch_speculation_end();                     \
  47         kernel_fpu_end();                                               \
  48         __s;                                                            \
  49 })
  50
  51 /* Use this macro if your virtual call does not return any value */
  52 #define __efi_call_virt(f, args...) \
  53 ({                                                                      \
  54         kernel_fpu_begin();                                             \
  55         firmware_restrict_branch_speculation_start();                   \
  56         ((efi_##f##_t __attribute__((regparm(0)))*)                     \
  57                 efi.systab->runtime->f)(args);                          \
  58         firmware_restrict_branch_speculation_end();                     \
  59         kernel_fpu_end();                                               \
  60 })
  61
  62 #define efi_ioremap(addr, size, type, attr)     ioremap_cache(addr, size)
  63
  64 #else /* !CONFIG_X86_32 */
  65
  66 #define EFI_LOADER_SIGNATURE    "EL64"
  67
  68 extern u64 asmlinkage efi_call(void *fp, ...);
  69
  70 #define efi_call_phys(f, args...)               efi_call((f), args)
  71
  72 #define efi_call_virt(f, ...)                                           \
  73 ({                                                                      \
  74         efi_status_t __s;                                               \
  75                                                                         \
  76         efi_sync_low_kernel_mappings();                                 \
  77         preempt_disable();                                              \
  78         __kernel_fpu_begin();                                           \
  79         firmware_restrict_branch_speculation_start();                   \
  80         __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__);    \
  81         firmware_restrict_branch_speculation_end();                     \
  82         __kernel_fpu_end();                                             \
  83         preempt_enable();                                               \
  84         __s;                                                            \
  85 })
  86
  87 /*
  88  * All X86_64 virt calls return non-void values. Thus, use non-void call for
  89  * virt calls that would be void on X86_32.
  90  */
  91 #define __efi_call_virt(f, args...) efi_call_virt(f, args)
  92
  93 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
  94                                         u32 type, u64 attribute);
  95
  96 #ifdef CONFIG_KASAN
  97 /*
  98  * CONFIG_KASAN may redefine memset to __memset.  __memset function is present
  99  * only in kernel binary.  Since the EFI stub linked into a separate binary it
 100  * doesn't have __memset().  So we should use standard memset from
 101  * arch/x86/boot/compressed/string.c.  The same applies to memcpy and memmove.
 102  */
 103 #undef memcpy
 104 #undef memset
 105 #undef memmove
 106 #endif
 107
 108 #endif /* CONFIG_X86_32 */
 109
 110 extern struct efi_scratch efi_scratch;
 111 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
 112 extern int __init efi_memblock_x86_reserve_range(void);
 113 extern pgd_t * __init efi_call_phys_prolog(void);
 114 extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
 115 extern void __init efi_print_memmap(void);
 116 extern void __init efi_unmap_memmap(void);
 117 extern void __init efi_memory_uc(u64 addr, unsigned long size);
 118 extern void __init efi_map_region(efi_memory_desc_t *md);
 119 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
 120 extern void efi_sync_low_kernel_mappings(void);
 121 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 122 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 123 extern void __init old_map_region(efi_memory_desc_t *md);
 124 extern void __init runtime_code_page_mkexec(void);
 125 extern void __init efi_runtime_mkexec(void);
 126 extern void __init efi_dump_pagetable(void);
 127 extern void __init efi_apply_memmap_quirks(void);
 128 extern int __init efi_reuse_config(u64 tables, int nr_tables);
 129 extern void efi_delete_dummy_variable(void);
 130
 131 struct efi_setup_data {
 132         u64 fw_vendor;
 133         u64 runtime;
 134         u64 tables;
 135         u64 smbios;
 136         u64 reserved[8];
 137 };
 138
 139 extern u64 efi_setup;
 140
 141 #ifdef CONFIG_EFI
 142
 143 static inline bool efi_is_native(void)
 144 {
 145         return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
 146 }
 147
 148 static inline bool efi_runtime_supported(void)
 149 {
 150         if (efi_is_native())
 151                 return true;
 152
 153         if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
 154                 return true;
 155
 156         return false;
 157 }
 158
 159 extern struct console early_efi_console;
 160 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
 161
 162 #ifdef CONFIG_EFI_MIXED
 163 extern void efi_thunk_runtime_setup(void);
 164 extern efi_status_t efi_thunk_set_virtual_address_map(
 165         void *phys_set_virtual_address_map,
 166         unsigned long memory_map_size,
 167         unsigned long descriptor_size,
 168         u32 descriptor_version,
 169         efi_memory_desc_t *virtual_map);
 170 #else
 171 static inline void efi_thunk_runtime_setup(void) {}
 172 static inline efi_status_t efi_thunk_set_virtual_address_map(
 173         void *phys_set_virtual_address_map,
 174         unsigned long memory_map_size,
 175         unsigned long descriptor_size,
 176         u32 descriptor_version,
 177         efi_memory_desc_t *virtual_map)
 178 {
 179         return EFI_SUCCESS;
 180 }
 181 #endif /* CONFIG_EFI_MIXED */
 182
 183
 184 /* arch specific definitions used by the stub code */
 185
 186 struct efi_config {
 187         u64 image_handle;
 188         u64 table;
 189         u64 allocate_pool;
 190         u64 allocate_pages;
 191         u64 get_memory_map;
 192         u64 free_pool;
 193         u64 free_pages;
 194         u64 locate_handle;
 195         u64 handle_protocol;
 196         u64 exit_boot_services;
 197         u64 text_output;
 198         efi_status_t (*call)(unsigned long, ...);
 199         bool is64;
 200 } __packed;
 201
 202 __pure const struct efi_config *__efi_early(void);
 203
 204 #define efi_call_early(f, ...)                                          \
 205         __efi_early()->call(__efi_early()->f, __VA_ARGS__);
 206
 207 extern bool efi_reboot_required(void);
 208
 209 #else
 210 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
 211 static inline bool efi_reboot_required(void)
 212 {
 213         return false;
 214 }
 215 #endif /* CONFIG_EFI */
 216
 217 #endif /* _ASM_X86_EFI_H */