xref: /kernel/linux/linux-5.10/arch/arm/include/asm/efi.h (revision 8c2ecf20) 
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);
20
21int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
22int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
23
24#define arch_efi_call_virt_setup()	efi_virtmap_load()
25#define arch_efi_call_virt_teardown()	efi_virtmap_unload()
26
27#define arch_efi_call_virt(p, f, args...)				\
28({									\
29	efi_##f##_t *__f;						\
30	__f = p->f;							\
31	__f(args);							\
32})
33
34#define ARCH_EFI_IRQ_FLAGS_MASK \
35	(PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
36	 PSR_T_BIT | MODE_MASK)
37
38static inline void efi_set_pgd(struct mm_struct *mm)
39{
40	check_and_switch_context(mm, NULL);
41}
42
43void efi_virtmap_load(void);
44void efi_virtmap_unload(void);
45
46#else
47#define efi_init()
48#endif /* CONFIG_EFI */
49
50/* arch specific definitions used by the stub code */
51
52struct screen_info *alloc_screen_info(void);
53void free_screen_info(struct screen_info *si);
54
55static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
56{
57}
58
59/*
60 * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
61 * so we will reserve that amount of memory. We have no easy way to tell what
62 * the actuall size of code + data the uncompressed kernel will use.
63 * If this is insufficient, the decompressor will relocate itself out of the
64 * way before performing the decompression.
65 */
66#define MAX_UNCOMP_KERNEL_SIZE	SZ_32M
67
68/*
69 * phys-to-virt patching requires that the physical to virtual offset fits
70 * into the immediate field of an add/sub instruction, which comes down to the
71 * 24 least significant bits being zero, and so the offset should be a multiple
72 * of 16 MB. Since PAGE_OFFSET itself is a multiple of 16 MB, the physical
73 * base should be aligned to 16 MB as well.
74 */
75#define EFI_PHYS_ALIGN		SZ_16M
76
77/* on ARM, the FDT should be located in a lowmem region */
78static inline unsigned long efi_get_max_fdt_addr(unsigned long image_addr)
79{
80	return round_down(image_addr, EFI_PHYS_ALIGN) + SZ_512M;
81}
82
83/* on ARM, the initrd should be loaded in a lowmem region */
84static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
85{
86	return round_down(image_addr, EFI_PHYS_ALIGN) + SZ_512M;
87}
88
89struct efi_arm_entry_state {
90	u32	cpsr_before_ebs;
91	u32	sctlr_before_ebs;
92	u32	cpsr_after_ebs;
93	u32	sctlr_after_ebs;
94};
95
96#endif /* _ASM_ARM_EFI_H */
97