1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
  4 */
  5
  6#ifndef __ASM_ARM_EFI_H
  7#define __ASM_ARM_EFI_H
  8
  9#include <asm/cacheflush.h>
 10#include <asm/cachetype.h>
 11#include <asm/early_ioremap.h>
 12#include <asm/fixmap.h>
 13#include <asm/highmem.h>
 14#include <asm/mach/map.h>
 15#include <asm/mmu_context.h>
 16#include <asm/pgtable.h>
 17#include <asm/ptrace.h>
 18
 19#ifdef CONFIG_EFI
 20void efi_init(void);
 21
 22int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
 23int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
 24
 25#define arch_efi_call_virt_setup()	efi_virtmap_load()
 26#define arch_efi_call_virt_teardown()	efi_virtmap_unload()
 27
 28#define arch_efi_call_virt(p, f, args...)				\
 29({									\
 30	efi_##f##_t *__f;						\
 31	__f = p->f;							\
 32	__f(args);							\
 33})
 34
 35#define ARCH_EFI_IRQ_FLAGS_MASK \
 36	(PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
 37	 PSR_T_BIT | MODE_MASK)
 38
 39static inline void efi_set_pgd(struct mm_struct *mm)
 40{
 41	check_and_switch_context(mm, NULL);
 42}
 43
 44void efi_virtmap_load(void);
 45void efi_virtmap_unload(void);
 46
 47#else
 48#define efi_init()
 49#endif /* CONFIG_EFI */
 50
 51/* arch specific definitions used by the stub code */
 52
 53#define efi_call_early(f, ...)		sys_table_arg->boottime->f(__VA_ARGS__)
 54#define __efi_call_early(f, ...)	f(__VA_ARGS__)
 55#define efi_call_runtime(f, ...)	sys_table_arg->runtime->f(__VA_ARGS__)
 56#define efi_is_64bit()			(false)
 57
 58#define efi_table_attr(table, attr, instance)				\
 59	((table##_t *)instance)->attr
 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 */