1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <asm/cpufeature.h>
7 #include <asm/fpsimd.h>
9 #include <asm/memory.h>
10 #include <asm/mmu_context.h>
12 #include <asm/ptrace.h>
13 #include <asm/tlbflush.h>
16 extern void efi_init(void);
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);
24 #define arch_efi_call_virt_setup() \
27 __efi_fpsimd_begin(); \
30 #define arch_efi_call_virt(p, f, args...) \
37 #define arch_efi_call_virt_teardown() \
40 efi_virtmap_unload(); \
43 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
45 /* arch specific definitions used by the stub code */
48 * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
49 * start of kernel and may not cross a 2MiB boundary. We set alignment to
50 * 2MiB so we know it won't cross a 2MiB boundary.
52 #define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
55 * In some configurations (e.g. VMAP_STACK && 64K pages), stacks built into the
56 * kernel need greater alignment than we require the segments to be padded to.
58 #define EFI_KIMG_ALIGN \
59 (SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN)
61 /* on arm64, the FDT may be located anywhere in system RAM */
62 static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
68 * On arm64, we have to ensure that the initrd ends up in the linear region,
69 * which is a 1 GB aligned region of size '1UL << (VA_BITS - 1)' that is
70 * guaranteed to cover the kernel Image.
72 * Since the EFI stub is part of the kernel Image, we can relax the
73 * usual requirements in Documentation/arm64/booting.txt, which still
74 * apply to other bootloaders, and are required for some kernel
77 static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
78 unsigned long image_addr)
80 return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS - 1));
83 #define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
84 #define __efi_call_early(f, ...) f(__VA_ARGS__)
85 #define efi_call_runtime(f, ...) sys_table_arg->runtime->f(__VA_ARGS__)
86 #define efi_is_64bit() (true)
88 #define efi_call_proto(protocol, f, instance, ...) \
89 ((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
91 #define alloc_screen_info(x...) &screen_info
93 static inline void free_screen_info(efi_system_table_t *sys_table_arg,
94 struct screen_info *si)
98 /* redeclare as 'hidden' so the compiler will generate relative references */
99 extern struct screen_info screen_info __attribute__((__visibility__("hidden")));
101 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
105 #define EFI_ALLOC_ALIGN SZ_64K
108 * On ARM systems, virtually remapped UEFI runtime services are set up in two
110 * - The stub retrieves the final version of the memory map from UEFI, populates
111 * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
112 * service to communicate the new mapping to the firmware (Note that the new
113 * mapping is not live at this time)
114 * - During an early initcall(), the EFI system table is permanently remapped
115 * and the virtual remapping of the UEFI Runtime Services regions is loaded
116 * into a private set of page tables. If this all succeeds, the Runtime
117 * Services are enabled and the EFI_RUNTIME_SERVICES bit set.
120 static inline void efi_set_pgd(struct mm_struct *mm)
124 if (system_uses_ttbr0_pan()) {
125 if (mm != current->active_mm) {
127 * Update the current thread's saved ttbr0 since it is
128 * restored as part of a return from exception. Enable
129 * access to the valid TTBR0_EL1 and invoke the errata
130 * workaround directly since there is no return from
131 * exception when invoking the EFI run-time services.
133 update_saved_ttbr0(current, mm);
134 uaccess_ttbr0_enable();
135 post_ttbr_update_workaround();
138 * Defer the switch to the current thread's TTBR0_EL1
139 * until uaccess_enable(). Restore the current
140 * thread's saved ttbr0 corresponding to its active_mm
142 uaccess_ttbr0_disable();
143 update_saved_ttbr0(current, current->active_mm);
148 void efi_virtmap_load(void);
149 void efi_virtmap_unload(void);
151 #endif /* _ASM_EFI_H */