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_call_proto(protocol, f, instance, ...)			\
 62	((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
 63
 64struct screen_info *alloc_screen_info(efi_system_table_t *sys_table_arg);
 65void free_screen_info(efi_system_table_t *sys_table, struct screen_info *si);
 66
 67static 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 */
 90static 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 */
 96static 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 */