xref: /openbmc/linux/arch/arm/include/asm/efi.h (revision cf1d2ffc)
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 void arm_efi_init(void);
21 
22 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
23 int 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 
efi_set_pgd(struct mm_struct * mm)32 static inline void efi_set_pgd(struct mm_struct *mm)
33 {
34 	check_and_switch_context(mm, NULL);
35 }
36 
37 void efi_virtmap_load(void);
38 void 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 */
efi_get_max_initrd_addr(unsigned long image_addr)64 static 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 
69 struct 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 
efi_capsule_flush_cache_range(void * addr,int size)76 static 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 */
82