arch/arm64/include/asm/efi.h

   1 #ifndef _ASM_EFI_H
   2 #define _ASM_EFI_H
   3
   4 #include <asm/io.h>
   5 #include <asm/mmu_context.h>
   6 #include <asm/neon.h>
   7 #include <asm/ptrace.h>
   8 #include <asm/tlbflush.h>
   9
  10 #ifdef CONFIG_EFI
  11 extern void efi_init(void);
  12 #else
  13 #define efi_init()
  14 #endif
  15
  16 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
  17
  18 #define efi_set_mapping_permissions     efi_create_mapping
  19
  20 #define arch_efi_call_virt_setup()                                      \
  21 ({                                                                      \
  22         kernel_neon_begin();                                            \
  23         efi_virtmap_load();                                             \
  24 })
  25
  26 #define arch_efi_call_virt(f, args...)                                  \
  27 ({                                                                      \
  28         efi_##f##_t *__f;                                               \
  29         __f = efi.systab->runtime->f;                                   \
  30         __f(args);                                                      \
  31 })
  32
  33 #define arch_efi_call_virt_teardown()                                   \
  34 ({                                                                      \
  35         efi_virtmap_unload();                                           \
  36         kernel_neon_end();                                              \
  37 })
  38
  39 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
  40
  41 /* arch specific definitions used by the stub code */
  42
  43 /*
  44  * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
  45  * start of kernel and may not cross a 2MiB boundary. We set alignment to
  46  * 2MiB so we know it won't cross a 2MiB boundary.
  47  */
  48 #define EFI_FDT_ALIGN   SZ_2M   /* used by allocate_new_fdt_and_exit_boot() */
  49 #define MAX_FDT_OFFSET  SZ_512M
  50
  51 #define efi_call_early(f, ...)          sys_table_arg->boottime->f(__VA_ARGS__)
  52 #define __efi_call_early(f, ...)        f(__VA_ARGS__)
  53 #define efi_is_64bit()                  (true)
  54
  55 #define alloc_screen_info(x...)         &screen_info
  56 #define free_screen_info(x...)
  57
  58 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
  59 {
  60 }
  61
  62 #define EFI_ALLOC_ALIGN         SZ_64K
  63
  64 /*
  65  * On ARM systems, virtually remapped UEFI runtime services are set up in two
  66  * distinct stages:
  67  * - The stub retrieves the final version of the memory map from UEFI, populates
  68  *   the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
  69  *   service to communicate the new mapping to the firmware (Note that the new
  70  *   mapping is not live at this time)
  71  * - During an early initcall(), the EFI system table is permanently remapped
  72  *   and the virtual remapping of the UEFI Runtime Services regions is loaded
  73  *   into a private set of page tables. If this all succeeds, the Runtime
  74  *   Services are enabled and the EFI_RUNTIME_SERVICES bit set.
  75  */
  76
  77 static inline void efi_set_pgd(struct mm_struct *mm)
  78 {
  79         switch_mm(NULL, mm, NULL);
  80 }
  81
  82 void efi_virtmap_load(void);
  83 void efi_virtmap_unload(void);
  84
  85 #endif /* _ASM_EFI_H */