arch/arm/include/asm/efi.h

   1 /*
   2  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef __ASM_ARM_EFI_H
  10 #define __ASM_ARM_EFI_H
  11
  12 #include <asm/cacheflush.h>
  13 #include <asm/cachetype.h>
  14 #include <asm/early_ioremap.h>
  15 #include <asm/fixmap.h>
  16 #include <asm/highmem.h>
  17 #include <asm/mach/map.h>
  18 #include <asm/mmu_context.h>
  19 #include <asm/pgtable.h>
  20
  21 #ifdef CONFIG_EFI
  22 void efi_init(void);
  23
  24 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
  25 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
  26
  27 #define efi_call_virt(f, ...)                                           \
  28 ({                                                                      \
  29         efi_##f##_t *__f;                                               \
  30         efi_status_t __s;                                               \
  31                                                                         \
  32         efi_virtmap_load();                                             \
  33         __f = efi.systab->runtime->f;                                   \
  34         __s = __f(__VA_ARGS__);                                         \
  35         efi_virtmap_unload();                                           \
  36         __s;                                                            \
  37 })
  38
  39 #define __efi_call_virt(f, ...)                                         \
  40 ({                                                                      \
  41         efi_##f##_t *__f;                                               \
  42                                                                         \
  43         efi_virtmap_load();                                             \
  44         __f = efi.systab->runtime->f;                                   \
  45         __f(__VA_ARGS__);                                               \
  46         efi_virtmap_unload();                                           \
  47 })
  48
  49 static inline void efi_set_pgd(struct mm_struct *mm)
  50 {
  51         check_and_switch_context(mm, NULL);
  52 }
  53
  54 void efi_virtmap_load(void);
  55 void efi_virtmap_unload(void);
  56
  57 #else
  58 #define efi_init()
  59 #endif /* CONFIG_EFI */
  60
  61 /* arch specific definitions used by the stub code */
  62
  63 #define efi_call_early(f, ...)          sys_table_arg->boottime->f(__VA_ARGS__)
  64 #define __efi_call_early(f, ...)        f(__VA_ARGS__)
  65 #define efi_is_64bit()                  (false)
  66
  67 struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg);
  68 void free_screen_info(efi_system_table_t *sys_table, struct screen_info *si);
  69
  70 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
  71 {
  72 }
  73
  74 /*
  75  * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
  76  * so we will reserve that amount of memory. We have no easy way to tell what
  77  * the actuall size of code + data the uncompressed kernel will use.
  78  * If this is insufficient, the decompressor will relocate itself out of the
  79  * way before performing the decompression.
  80  */
  81 #define MAX_UNCOMP_KERNEL_SIZE  SZ_32M
  82
  83 /*
  84  * The kernel zImage should preferably be located between 32 MB and 128 MB
  85  * from the base of DRAM. The min address leaves space for a maximal size
  86  * uncompressed image, and the max address is due to how the zImage decompressor
  87  * picks a destination address.
  88  */
  89 #define ZIMAGE_OFFSET_LIMIT     SZ_128M
  90 #define MIN_ZIMAGE_OFFSET       MAX_UNCOMP_KERNEL_SIZE
  91 #define MAX_FDT_OFFSET          ZIMAGE_OFFSET_LIMIT
  92
  93 #endif /* _ASM_ARM_EFI_H */