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