1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 #ifndef _ASM_EFI_H
3 #define _ASM_EFI_H
4
5 #include <asm/boot.h>
6 #include <asm/cpufeature.h>
7 #include <asm/fpsimd.h>
8 #include <asm/io.h>
9 #include <asm/memory.h>
10 #include <asm/mmu_context.h>
11 #include <asm/neon.h>
12 #include <asm/ptrace.h>
13 #include <asm/tlbflush.h>
14
15 #ifdef CONFIG_EFI
16 extern void efi_init(void);
17
18 bool efi_runtime_fixup_exception(struct pt_reg
19 #else
20 #define efi_init()
21
22 static inline
23 bool efi_runtime_fixup_exception(struct pt_reg
24 {
25 return false;
26 }
27 #endif
28
29 int efi_create_mapping(struct mm_struct *mm, e
30 int efi_set_mapping_permissions(struct mm_stru
31 bool has_bti);
32
33 #undef arch_efi_call_virt
34 #define arch_efi_call_virt(p, f, args...)
35 __efi_rt_asm_wrapper((p)->f, #f, args)
36
37 extern u64 *efi_rt_stack_top;
38 efi_status_t __efi_rt_asm_wrapper(void *, cons
39
40 void arch_efi_call_virt_setup(void);
41 void arch_efi_call_virt_teardown(void);
42
43 /*
44 * efi_rt_stack_top[-1] contains the value the
45 * switching to the EFI runtime stack.
46 */
47 #define current_in_efi()
48 (!preemptible() && efi_rt_stack_top !=
49 on_task_stack(current, READ_ONCE(efi_
50
51 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | P
52
53 /*
54 * Even when Linux uses IRQ priorities for IRQ
55 * And EFI shouldn't really play around with p
56 * which priorities the OS has assigned to its
57 */
58 #define arch_efi_save_flags(state_flags)
59 ((void)((state_flags) = read_sysreg(da
60
61 #define arch_efi_restore_flags(state_flags)
62
63
64 /* arch specific definitions used by the stub
65
66 /*
67 * In some configurations (e.g. VMAP_STACK &&
68 * kernel need greater alignment than we requi
69 */
70 #define EFI_KIMG_ALIGN \
71 (SEGMENT_ALIGN > THREAD_ALIGN ? SEGMEN
72
73 /*
74 * On arm64, we have to ensure that the initrd
75 * which is a 1 GB aligned region of size '1UL
76 * guaranteed to cover the kernel Image.
77 *
78 * Since the EFI stub is part of the kernel Im
79 * usual requirements in Documentation/arch/ar
80 * apply to other bootloaders, and are require
81 * configurations.
82 */
83 static inline unsigned long efi_get_max_initrd
84 {
85 return (image_addr & ~(SZ_1G - 1UL)) +
86 }
87
88 static inline unsigned long efi_get_kimg_min_a
89 {
90 extern bool efi_nokaslr;
91
92 /*
93 * Although relocatable kernels can fi
94 * respect to MIN_KIMG_ALIGN, the resu
95 * subtly out of sync with those recor
96 * disabled but the image required rel
97 * 2M alignment if KASLR was explicitl
98 * going to be activated to begin with
99 */
100 return efi_nokaslr ? MIN_KIMG_ALIGN :
101 }
102
103 #define EFI_ALLOC_ALIGN SZ_64K
104 #define EFI_ALLOC_LIMIT ((1UL << 48) -
105
106 extern unsigned long primary_entry_offset(void
107
108 /*
109 * On ARM systems, virtually remapped UEFI run
110 * distinct stages:
111 * - The stub retrieves the final version of t
112 * the virt_addr fields and calls the SetVir
113 * service to communicate the new mapping to
114 * mapping is not live at this time)
115 * - During an early initcall(), the EFI syste
116 * and the virtual remapping of the UEFI Run
117 * into a private set of page tables. If thi
118 * Services are enabled and the EFI_RUNTIME_
119 */
120
121 static inline void efi_set_pgd(struct mm_struc
122 {
123 __switch_mm(mm);
124
125 if (system_uses_ttbr0_pan()) {
126 if (mm != current->active_mm)
127 /*
128 * Update the current
129 * restored as part of
130 * access to the valid
131 * workaround directly
132 * exception when invo
133 */
134 update_saved_ttbr0(cur
135 uaccess_ttbr0_enable()
136 post_ttbr_update_worka
137 } else {
138 /*
139 * Defer the switch to
140 * until uaccess_enabl
141 * thread's saved ttbr
142 */
143 uaccess_ttbr0_disable(
144 update_saved_ttbr0(cur
145 }
146 }
147 }
148
149 void efi_virtmap_load(void);
150 void efi_virtmap_unload(void);
151
152 static inline void efi_capsule_flush_cache_ran
153 {
154 dcache_clean_inval_poc((unsigned long)
155 }
156
157 efi_status_t efi_handle_corrupted_x18(efi_stat
158
159 void efi_icache_sync(unsigned long start, unsi
160
161 #endif /* _ASM_EFI_H */
162
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