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 #include <asm/ptrace.h>
  21
  22 #ifdef CONFIG_EFI
  23 void efi_init(void);
  24
  25 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
  26 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
  27
  28 #define arch_efi_call_virt_setup()      efi_virtmap_load()
  29 #define arch_efi_call_virt_teardown()   efi_virtmap_unload()
  30
  31 #define arch_efi_call_virt(p, f, args...)                               \
  32 ({                                                                      \
  33         efi_##f##_t *__f;                                               \
  34         __f = p->f;                                                     \
  35         __f(args);                                                      \
  36 })
  37
  38 #define ARCH_EFI_IRQ_FLAGS_MASK \
  39         (PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
  40          PSR_T_BIT | MODE_MASK)
  41
  42 static inline void efi_set_pgd(struct mm_struct *mm)
  43 {
  44         check_and_switch_context(mm, NULL);
  45 }
  46
  47 void efi_virtmap_load(void);
  48 void efi_virtmap_unload(void);
  49
  50 #else
  51 #define efi_init()
  52 #endif /* CONFIG_EFI */
  53
  54 /* arch specific definitions used by the stub code */
  55
  56 #define efi_call_early(f, ...)          sys_table_arg->boottime->f(__VA_ARGS__)
  57 #define __efi_call_early(f, ...)        f(__VA_ARGS__)
  58 #define efi_call_runtime(f, ...)        sys_table_arg->runtime->f(__VA_ARGS__)
  59 #define efi_is_64bit()                  (false)
  60
  61 #define efi_call_proto(protocol, f, instance, ...)                      \
  62         ((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
  63
  64 struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg);
  65 void free_screen_info(efi_system_table_t *sys_table, struct screen_info *si);
  66
  67 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
  68 {
  69 }
  70
  71 /*
  72  * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
  73  * so we will reserve that amount of memory. We have no easy way to tell what
  74  * the actuall size of code + data the uncompressed kernel will use.
  75  * If this is insufficient, the decompressor will relocate itself out of the
  76  * way before performing the decompression.
  77  */
  78 #define MAX_UNCOMP_KERNEL_SIZE  SZ_32M
  79
  80 /*
  81  * The kernel zImage should preferably be located between 32 MB and 128 MB
  82  * from the base of DRAM. The min address leaves space for a maximal size
  83  * uncompressed image, and the max address is due to how the zImage decompressor
  84  * picks a destination address.
  85  */
  86 #define ZIMAGE_OFFSET_LIMIT     SZ_128M
  87 #define MIN_ZIMAGE_OFFSET       MAX_UNCOMP_KERNEL_SIZE
  88
  89 /* on ARM, the FDT should be located in the first 128 MB of RAM */
  90 static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
  91 {
  92         return dram_base + ZIMAGE_OFFSET_LIMIT;
  93 }
  94
  95 /* on ARM, the initrd should be loaded in a lowmem region */
  96 static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
  97                                                     unsigned long image_addr)
  98 {
  99         return dram_base + SZ_512M;
 100 }
 101
 102 #endif /* _ASM_ARM_EFI_H */