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
  26 #define efi_call_virt(f, ...)                                           \
  27 ({                                                                      \
  28         efi_##f##_t *__f;                                               \
  29         efi_status_t __s;                                               \
  30                                                                         \
  31         efi_virtmap_load();                                             \
  32         __f = efi.systab->runtime->f;                                   \
  33         __s = __f(__VA_ARGS__);                                         \
  34         efi_virtmap_unload();                                           \
  35         __s;                                                            \
  36 })
  37
  38 #define __efi_call_virt(f, ...)                                         \
  39 ({                                                                      \
  40         efi_##f##_t *__f;                                               \
  41                                                                         \
  42         efi_virtmap_load();                                             \
  43         __f = efi.systab->runtime->f;                                   \
  44         __f(__VA_ARGS__);                                               \
  45         efi_virtmap_unload();                                           \
  46 })
  47
  48 static inline void efi_set_pgd(struct mm_struct *mm)
  49 {
  50         check_and_switch_context(mm, NULL);
  51 }
  52
  53 void efi_virtmap_load(void);
  54 void efi_virtmap_unload(void);
  55
  56 #else
  57 #define efi_init()
  58 #endif /* CONFIG_EFI */
  59
  60 /* arch specific definitions used by the stub code */
  61
  62 #define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
  63
  64 /*
  65  * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
  66  * so we will reserve that amount of memory. We have no easy way to tell what
  67  * the actuall size of code + data the uncompressed kernel will use.
  68  * If this is insufficient, the decompressor will relocate itself out of the
  69  * way before performing the decompression.
  70  */
  71 #define MAX_UNCOMP_KERNEL_SIZE  SZ_32M
  72
  73 /*
  74  * The kernel zImage should preferably be located between 32 MB and 128 MB
  75  * from the base of DRAM. The min address leaves space for a maximal size
  76  * uncompressed image, and the max address is due to how the zImage decompressor
  77  * picks a destination address.
  78  */
  79 #define ZIMAGE_OFFSET_LIMIT     SZ_128M
  80 #define MIN_ZIMAGE_OFFSET       MAX_UNCOMP_KERNEL_SIZE
  81 #define MAX_FDT_OFFSET          ZIMAGE_OFFSET_LIMIT
  82
  83 #endif /* _ASM_ARM_EFI_H */