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