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
19 void efi_init(void);
20 
21 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
22 int 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 
efi_set_pgd(struct mm_struct * mm)38 static inline void efi_set_pgd(struct mm_struct *mm)
39 {
40 	check_and_switch_context(mm, NULL);
41 }
42 
43 void efi_virtmap_load(void);
44 void 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 
52 struct screen_info *alloc_screen_info(void);
53 void free_screen_info(struct screen_info *si);
54 
55 /*
56  * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
57  * so we will reserve that amount of memory. We have no easy way to tell what
58  * the actuall size of code + data the uncompressed kernel will use.
59  * If this is insufficient, the decompressor will relocate itself out of the
60  * way before performing the decompression.
61  */
62 #define MAX_UNCOMP_KERNEL_SIZE	SZ_32M
63 
64 /*
65  * phys-to-virt patching requires that the physical to virtual offset is a
66  * multiple of 2 MiB. However, using an alignment smaller than TEXT_OFFSET
67  * here throws off the memory allocation logic, so let's use the lowest power
68  * of two greater than 2 MiB and greater than TEXT_OFFSET.
69  */
70 #define EFI_PHYS_ALIGN		max(UL(SZ_2M), roundup_pow_of_two(TEXT_OFFSET))
71 
72 /* on ARM, the initrd should be loaded in a lowmem region */
efi_get_max_initrd_addr(unsigned long image_addr)73 static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
74 {
75 	return round_down(image_addr, SZ_4M) + SZ_512M;
76 }
77 
78 struct efi_arm_entry_state {
79 	u32	cpsr_before_ebs;
80 	u32	sctlr_before_ebs;
81 	u32	cpsr_after_ebs;
82 	u32	sctlr_after_ebs;
83 };
84 
efi_capsule_flush_cache_range(void * addr,int size)85 static inline void efi_capsule_flush_cache_range(void *addr, int size)
86 {
87 	__cpuc_flush_dcache_area(addr, size);
88 }
89 
90 #endif /* _ASM_ARM_EFI_H */
91