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/processor-flags.h>
   7 #include <asm/tlb.h>
   8
   9 /*
  10  * We map the EFI regions needed for runtime services non-contiguously,
  11  * with preserved alignment on virtual addresses starting from -4G down
  12  * for a total max space of 64G. This way, we provide for stable runtime
  13  * services addresses across kernels so that a kexec'd kernel can still
  14  * use them.
  15  *
  16  * This is the main reason why we're doing stable VA mappings for RT
  17  * services.
  18  *
  19  * This flag is used in conjuction with a chicken bit called
  20  * "efi=old_map" which can be used as a fallback to the old runtime
  21  * services mapping method in case there's some b0rkage with a
  22  * particular EFI implementation (haha, it is hard to hold up the
  23  * sarcasm here...).
  24  */
  25 #define EFI_OLD_MEMMAP          EFI_ARCH_1
  26
  27 #define EFI32_LOADER_SIGNATURE  "EL32"
  28 #define EFI64_LOADER_SIGNATURE  "EL64"
  29
  30 #define MAX_CMDLINE_ADDRESS     UINT_MAX
  31
  32 #define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF
  33
  34 #ifdef CONFIG_X86_32
  35
  36 extern unsigned long asmlinkage efi_call_phys(void *, ...);
  37
  38 #define arch_efi_call_virt_setup()      kernel_fpu_begin()
  39 #define arch_efi_call_virt_teardown()   kernel_fpu_end()
  40
  41 /*
  42  * Wrap all the virtual calls in a way that forces the parameters on the stack.
  43  */
  44 #define arch_efi_call_virt(f, args...)                                  \
  45 ({                                                                      \
  46         ((efi_##f##_t __attribute__((regparm(0)))*)                     \
  47                 efi.systab->runtime->f)(args);                          \
  48 })
  49
  50 #define efi_ioremap(addr, size, type, attr)     ioremap_cache(addr, size)
  51
  52 #else /* !CONFIG_X86_32 */
  53
  54 #define EFI_LOADER_SIGNATURE    "EL64"
  55
  56 extern u64 asmlinkage efi_call(void *fp, ...);
  57
  58 #define efi_call_phys(f, args...)               efi_call((f), args)
  59
  60 /*
  61  * Scratch space used for switching the pagetable in the EFI stub
  62  */
  63 struct efi_scratch {
  64         u64     r15;
  65         u64     prev_cr3;
  66         pgd_t   *efi_pgt;
  67         bool    use_pgd;
  68         u64     phys_stack;
  69 } __packed;
  70
  71 #define arch_efi_call_virt_setup()                                      \
  72 ({                                                                      \
  73         efi_sync_low_kernel_mappings();                                 \
  74         preempt_disable();                                              \
  75         __kernel_fpu_begin();                                           \
  76                                                                         \
  77         if (efi_scratch.use_pgd) {                                      \
  78                 efi_scratch.prev_cr3 = read_cr3();                      \
  79                 write_cr3((unsigned long)efi_scratch.efi_pgt);          \
  80                 __flush_tlb_all();                                      \
  81         }                                                               \
  82 })
  83
  84 #define arch_efi_call_virt(f, args...)                                  \
  85         efi_call((void *)efi.systab->runtime->f, args)                  \
  86
  87 #define arch_efi_call_virt_teardown()                                   \
  88 ({                                                                      \
  89         if (efi_scratch.use_pgd) {                                      \
  90                 write_cr3(efi_scratch.prev_cr3);                        \
  91                 __flush_tlb_all();                                      \
  92         }                                                               \
  93                                                                         \
  94         __kernel_fpu_end();                                             \
  95         preempt_enable();                                               \
  96 })
  97
  98 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
  99                                         u32 type, u64 attribute);
 100
 101 #ifdef CONFIG_KASAN
 102 /*
 103  * CONFIG_KASAN may redefine memset to __memset.  __memset function is present
 104  * only in kernel binary.  Since the EFI stub linked into a separate binary it
 105  * doesn't have __memset().  So we should use standard memset from
 106  * arch/x86/boot/compressed/string.c.  The same applies to memcpy and memmove.
 107  */
 108 #undef memcpy
 109 #undef memset
 110 #undef memmove
 111 #endif
 112
 113 #endif /* CONFIG_X86_32 */
 114
 115 extern struct efi_scratch efi_scratch;
 116 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
 117 extern int __init efi_memblock_x86_reserve_range(void);
 118 extern pgd_t * __init efi_call_phys_prolog(void);
 119 extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
 120 extern void __init efi_print_memmap(void);
 121 extern void __init efi_unmap_memmap(void);
 122 extern void __init efi_memory_uc(u64 addr, unsigned long size);
 123 extern void __init efi_map_region(efi_memory_desc_t *md);
 124 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
 125 extern void efi_sync_low_kernel_mappings(void);
 126 extern int __init efi_alloc_page_tables(void);
 127 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 128 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
 129 extern void __init old_map_region(efi_memory_desc_t *md);
 130 extern void __init runtime_code_page_mkexec(void);
 131 extern void __init efi_runtime_update_mappings(void);
 132 extern void __init efi_dump_pagetable(void);
 133 extern void __init efi_apply_memmap_quirks(void);
 134 extern int __init efi_reuse_config(u64 tables, int nr_tables);
 135 extern void efi_delete_dummy_variable(void);
 136
 137 struct efi_setup_data {
 138         u64 fw_vendor;
 139         u64 runtime;
 140         u64 tables;
 141         u64 smbios;
 142         u64 reserved[8];
 143 };
 144
 145 extern u64 efi_setup;
 146
 147 #ifdef CONFIG_EFI
 148
 149 static inline bool efi_is_native(void)
 150 {
 151         return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
 152 }
 153
 154 static inline bool efi_runtime_supported(void)
 155 {
 156         if (efi_is_native())
 157                 return true;
 158
 159         if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
 160                 return true;
 161
 162         return false;
 163 }
 164
 165 extern struct console early_efi_console;
 166 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
 167
 168 extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
 169
 170 #ifdef CONFIG_EFI_MIXED
 171 extern void efi_thunk_runtime_setup(void);
 172 extern 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 #else
 179 static inline void efi_thunk_runtime_setup(void) {}
 180 static inline efi_status_t efi_thunk_set_virtual_address_map(
 181         void *phys_set_virtual_address_map,
 182         unsigned long memory_map_size,
 183         unsigned long descriptor_size,
 184         u32 descriptor_version,
 185         efi_memory_desc_t *virtual_map)
 186 {
 187         return EFI_SUCCESS;
 188 }
 189 #endif /* CONFIG_EFI_MIXED */
 190
 191
 192 /* arch specific definitions used by the stub code */
 193
 194 struct efi_config {
 195         u64 image_handle;
 196         u64 table;
 197         u64 allocate_pool;
 198         u64 allocate_pages;
 199         u64 get_memory_map;
 200         u64 free_pool;
 201         u64 free_pages;
 202         u64 locate_handle;
 203         u64 handle_protocol;
 204         u64 exit_boot_services;
 205         u64 text_output;
 206         efi_status_t (*call)(unsigned long, ...);
 207         bool is64;
 208 } __packed;
 209
 210 __pure const struct efi_config *__efi_early(void);
 211
 212 #define efi_call_early(f, ...)                                          \
 213         __efi_early()->call(__efi_early()->f, __VA_ARGS__);
 214
 215 #define __efi_call_early(f, ...)                                        \
 216         __efi_early()->call((unsigned long)f, __VA_ARGS__);
 217
 218 #define efi_is_64bit()          __efi_early()->is64
 219
 220 extern bool efi_reboot_required(void);
 221
 222 #else
 223 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
 224 static inline bool efi_reboot_required(void)
 225 {
 226         return false;
 227 }
 228 #endif /* CONFIG_EFI */
 229
 230 #endif /* _ASM_X86_EFI_H */