LXR linux/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
  23void efi_init(void);
  24
  25int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
  26int 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
  42static inline void efi_set_pgd(struct mm_struct *mm)
  43{
  44        check_and_switch_context(mm, NULL);
  45}
  46
  47void efi_virtmap_load(void);
  48void 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_table_attr(table, attr, instance)                           \
  62        ((table##_t *)instance)->attr
  63
  64#define efi_call_proto(protocol, f, instance, ...)                      \
  65        ((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
  66
  67struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg);
  68void free_screen_info(efi_system_table_t *sys_table, struct screen_info *si);
  69
  70static 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
  92/* on ARM, the FDT should be located in the first 128 MB of RAM */
  93static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
  94{
  95        return dram_base + ZIMAGE_OFFSET_LIMIT;
  96}
  97
  98/* on ARM, the initrd should be loaded in a lowmem region */
  99static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
 100                                                    unsigned long image_addr)
 101{
 102        return dram_base + SZ_512M;
 103}
 104
 105#endif /* _ASM_ARM_EFI_H */
 106