Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
f84d0275 MS |
2 | #ifndef _ASM_EFI_H |
3 | #define _ASM_EFI_H | |
4 | ||
24d7c494 | 5 | #include <asm/boot.h> |
39bc88e5 | 6 | #include <asm/cpufeature.h> |
4328825d | 7 | #include <asm/fpsimd.h> |
f84d0275 | 8 | #include <asm/io.h> |
170976bc | 9 | #include <asm/memory.h> |
f7d92489 | 10 | #include <asm/mmu_context.h> |
e15dd494 | 11 | #include <asm/neon.h> |
ee6cab5d | 12 | #include <asm/ptrace.h> |
f7d92489 | 13 | #include <asm/tlbflush.h> |
f84d0275 MS |
14 | |
15 | #ifdef CONFIG_EFI | |
16 | extern void efi_init(void); | |
f84d0275 MS |
17 | #else |
18 | #define efi_init() | |
f84d0275 MS |
19 | #endif |
20 | ||
f7d92489 | 21 | int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); |
bd264d04 | 22 | int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md); |
789957ef | 23 | |
489f80f7 | 24 | #define arch_efi_call_virt_setup() \ |
e15dd494 | 25 | ({ \ |
f3cdfd23 | 26 | efi_virtmap_load(); \ |
4328825d | 27 | __efi_fpsimd_begin(); \ |
e15dd494 AB |
28 | }) |
29 | ||
80e75596 | 30 | #define arch_efi_call_virt(p, f, args...) \ |
e15dd494 | 31 | ({ \ |
f3cdfd23 | 32 | efi_##f##_t *__f; \ |
80e75596 | 33 | __f = p->f; \ |
7e611e7d | 34 | __efi_rt_asm_wrapper(__f, #f, args); \ |
489f80f7 MR |
35 | }) |
36 | ||
37 | #define arch_efi_call_virt_teardown() \ | |
38 | ({ \ | |
4328825d | 39 | __efi_fpsimd_end(); \ |
f3cdfd23 | 40 | efi_virtmap_unload(); \ |
e15dd494 AB |
41 | }) |
42 | ||
7e611e7d AB |
43 | efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...); |
44 | ||
ee6cab5d MR |
45 | #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT) |
46 | ||
4a503217 JT |
47 | /* |
48 | * Even when Linux uses IRQ priorities for IRQ disabling, EFI does not. | |
49 | * And EFI shouldn't really play around with priority masking as it is not aware | |
50 | * which priorities the OS has assigned to its interrupts. | |
51 | */ | |
52 | #define arch_efi_save_flags(state_flags) \ | |
53 | ((void)((state_flags) = read_sysreg(daif))) | |
54 | ||
55 | #define arch_efi_restore_flags(state_flags) write_sysreg(state_flags, daif) | |
56 | ||
57 | ||
a13b0077 AB |
58 | /* arch specific definitions used by the stub code */ |
59 | ||
60 | /* | |
61 | * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from | |
62 | * start of kernel and may not cross a 2MiB boundary. We set alignment to | |
63 | * 2MiB so we know it won't cross a 2MiB boundary. | |
64 | */ | |
65 | #define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */ | |
138728dd | 66 | |
e3067861 MR |
67 | /* |
68 | * In some configurations (e.g. VMAP_STACK && 64K pages), stacks built into the | |
69 | * kernel need greater alignment than we require the segments to be padded to. | |
70 | */ | |
71 | #define EFI_KIMG_ALIGN \ | |
72 | (SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN) | |
170976bc | 73 | |
138728dd AB |
74 | /* on arm64, the FDT may be located anywhere in system RAM */ |
75 | static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base) | |
76 | { | |
77 | return ULONG_MAX; | |
78 | } | |
79 | ||
80 | /* | |
81 | * On arm64, we have to ensure that the initrd ends up in the linear region, | |
82 | * which is a 1 GB aligned region of size '1UL << (VA_BITS - 1)' that is | |
83 | * guaranteed to cover the kernel Image. | |
84 | * | |
85 | * Since the EFI stub is part of the kernel Image, we can relax the | |
b693d0b3 | 86 | * usual requirements in Documentation/arm64/booting.rst, which still |
138728dd AB |
87 | * apply to other bootloaders, and are required for some kernel |
88 | * configurations. | |
89 | */ | |
90 | static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base, | |
91 | unsigned long image_addr) | |
92 | { | |
93 | return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS - 1)); | |
94 | } | |
a13b0077 | 95 | |
fc372064 AB |
96 | #define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__) |
97 | #define __efi_call_early(f, ...) f(__VA_ARGS__) | |
6d0ca4a4 | 98 | #define efi_call_runtime(f, ...) sys_table_arg->runtime->f(__VA_ARGS__) |
fc372064 | 99 | #define efi_is_64bit() (true) |
a13b0077 | 100 | |
c4db9c1e LW |
101 | #define efi_table_attr(table, attr, instance) \ |
102 | ((table##_t *)instance)->attr | |
103 | ||
3552fdf2 LW |
104 | #define efi_call_proto(protocol, f, instance, ...) \ |
105 | ((protocol##_t *)instance)->f(instance, ##__VA_ARGS__) | |
106 | ||
57fdb89a AB |
107 | #define alloc_screen_info(x...) &screen_info |
108 | #define free_screen_info(x...) | |
109 | ||
760b61d7 AB |
110 | /* redeclare as 'hidden' so the compiler will generate relative references */ |
111 | extern struct screen_info screen_info __attribute__((__visibility__("hidden"))); | |
112 | ||
9822504c AB |
113 | static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt) |
114 | { | |
115 | } | |
116 | ||
1bd0abb0 AB |
117 | #define EFI_ALLOC_ALIGN SZ_64K |
118 | ||
f3cdfd23 | 119 | /* |
60305db9 | 120 | * On ARM systems, virtually remapped UEFI runtime services are set up in two |
f3cdfd23 AB |
121 | * distinct stages: |
122 | * - The stub retrieves the final version of the memory map from UEFI, populates | |
123 | * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime | |
124 | * service to communicate the new mapping to the firmware (Note that the new | |
125 | * mapping is not live at this time) | |
60305db9 AB |
126 | * - During an early initcall(), the EFI system table is permanently remapped |
127 | * and the virtual remapping of the UEFI Runtime Services regions is loaded | |
128 | * into a private set of page tables. If this all succeeds, the Runtime | |
129 | * Services are enabled and the EFI_RUNTIME_SERVICES bit set. | |
f3cdfd23 | 130 | */ |
f3cdfd23 | 131 | |
f7d92489 AB |
132 | static inline void efi_set_pgd(struct mm_struct *mm) |
133 | { | |
39bc88e5 CM |
134 | __switch_mm(mm); |
135 | ||
136 | if (system_uses_ttbr0_pan()) { | |
137 | if (mm != current->active_mm) { | |
138 | /* | |
139 | * Update the current thread's saved ttbr0 since it is | |
6b88a32c CM |
140 | * restored as part of a return from exception. Enable |
141 | * access to the valid TTBR0_EL1 and invoke the errata | |
142 | * workaround directly since there is no return from | |
143 | * exception when invoking the EFI run-time services. | |
39bc88e5 CM |
144 | */ |
145 | update_saved_ttbr0(current, mm); | |
6b88a32c CM |
146 | uaccess_ttbr0_enable(); |
147 | post_ttbr_update_workaround(); | |
39bc88e5 CM |
148 | } else { |
149 | /* | |
150 | * Defer the switch to the current thread's TTBR0_EL1 | |
151 | * until uaccess_enable(). Restore the current | |
152 | * thread's saved ttbr0 corresponding to its active_mm | |
39bc88e5 | 153 | */ |
6b88a32c | 154 | uaccess_ttbr0_disable(); |
0adbdfde | 155 | update_saved_ttbr0(current, current->active_mm); |
39bc88e5 CM |
156 | } |
157 | } | |
f7d92489 AB |
158 | } |
159 | ||
f3cdfd23 AB |
160 | void efi_virtmap_load(void); |
161 | void efi_virtmap_unload(void); | |
162 | ||
f84d0275 | 163 | #endif /* _ASM_EFI_H */ |