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/neon.h>
   6
   7 #ifdef CONFIG_EFI
   8 extern void efi_init(void);
   9 #else
  10 #define efi_init()
  11 #endif
  12
  13 #define efi_call_virt(f, ...)                                           \
  14 ({                                                                      \
  15         efi_##f##_t *__f;                                               \
  16         efi_status_t __s;                                               \
  17                                                                         \
  18         kernel_neon_begin();                                            \
  19         efi_virtmap_load();                                             \
  20         __f = efi.systab->runtime->f;                                   \
  21         __s = __f(__VA_ARGS__);                                         \
  22         efi_virtmap_unload();                                           \
  23         kernel_neon_end();                                              \
  24         __s;                                                            \
  25 })
  26
  27 #define __efi_call_virt(f, ...)                                         \
  28 ({                                                                      \
  29         efi_##f##_t *__f;                                               \
  30                                                                         \
  31         kernel_neon_begin();                                            \
  32         efi_virtmap_load();                                             \
  33         __f = efi.systab->runtime->f;                                   \
  34         __f(__VA_ARGS__);                                               \
  35         efi_virtmap_unload();                                           \
  36         kernel_neon_end();                                              \
  37 })
  38
  39 /* arch specific definitions used by the stub code */
  40
  41 /*
  42  * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
  43  * start of kernel and may not cross a 2MiB boundary. We set alignment to
  44  * 2MiB so we know it won't cross a 2MiB boundary.
  45  */
  46 #define EFI_FDT_ALIGN   SZ_2M   /* used by allocate_new_fdt_and_exit_boot() */
  47 #define MAX_FDT_OFFSET  SZ_512M
  48
  49 #define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
  50
  51 #define EFI_ALLOC_ALIGN         SZ_64K
  52
  53 /*
  54  * On ARM systems, virtually remapped UEFI runtime services are set up in two
  55  * distinct stages:
  56  * - The stub retrieves the final version of the memory map from UEFI, populates
  57  *   the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
  58  *   service to communicate the new mapping to the firmware (Note that the new
  59  *   mapping is not live at this time)
  60  * - During an early initcall(), the EFI system table is permanently remapped
  61  *   and the virtual remapping of the UEFI Runtime Services regions is loaded
  62  *   into a private set of page tables. If this all succeeds, the Runtime
  63  *   Services are enabled and the EFI_RUNTIME_SERVICES bit set.
  64  */
  65
  66 void efi_virtmap_load(void);
  67 void efi_virtmap_unload(void);
  68
  69 #endif /* _ASM_EFI_H */