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/ptrace.h>
17
18#ifdef CONFIG_EFI
19void efi_init(void);
20void arm_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, bool);
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_IRQ_FLAGS_MASK \
29	(PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
30	 PSR_T_BIT | MODE_MASK)
31
32static inline void efi_set_pgd(struct mm_struct *mm)
33{
34	check_and_switch_context(mm, NULL);
35}
36
37void efi_virtmap_load(void);
38void efi_virtmap_unload(void);
39
40#else
41#define arm_efi_init()
42#endif /* CONFIG_EFI */
43
44/* arch specific definitions used by the stub code */
45
46/*
47 * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
48 * so we will reserve that amount of memory. We have no easy way to tell what
49 * the actuall size of code + data the uncompressed kernel will use.
50 * If this is insufficient, the decompressor will relocate itself out of the
51 * way before performing the decompression.
52 */
53#define MAX_UNCOMP_KERNEL_SIZE	SZ_32M
54
55/*
56 * phys-to-virt patching requires that the physical to virtual offset is a
57 * multiple of 2 MiB. However, using an alignment smaller than TEXT_OFFSET
58 * here throws off the memory allocation logic, so let's use the lowest power
59 * of two greater than 2 MiB and greater than TEXT_OFFSET.
60 */
61#define EFI_PHYS_ALIGN		max(UL(SZ_2M), roundup_pow_of_two(TEXT_OFFSET))
62
63/* on ARM, the initrd should be loaded in a lowmem region */
64static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
65{
66	return round_down(image_addr, SZ_4M) + SZ_512M;
67}
68
69struct efi_arm_entry_state {
70	u32	cpsr_before_ebs;
71	u32	sctlr_before_ebs;
72	u32	cpsr_after_ebs;
73	u32	sctlr_after_ebs;
74};
75
76static inline void efi_capsule_flush_cache_range(void *addr, int size)
77{
78	__cpuc_flush_dcache_area(addr, size);
79}
80
81#endif /* _ASM_ARM_EFI_H */