4 #include <asm/cpufeature.h>
6 #include <asm/mmu_context.h>
8 #include <asm/ptrace.h>
9 #include <asm/tlbflush.h>
12 extern void efi_init(void);
17 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
18 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
20 #define arch_efi_call_virt_setup() \
22 kernel_neon_begin(); \
26 #define arch_efi_call_virt(p, f, args...) \
33 #define arch_efi_call_virt_teardown() \
35 efi_virtmap_unload(); \
39 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
41 /* arch specific definitions used by the stub code */
44 * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
45 * start of kernel and may not cross a 2MiB boundary. We set alignment to
46 * 2MiB so we know it won't cross a 2MiB boundary.
48 #define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
49 #define MAX_FDT_OFFSET SZ_512M
51 #define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
52 #define __efi_call_early(f, ...) f(__VA_ARGS__)
53 #define efi_is_64bit() (true)
55 #define efi_call_proto(protocol, f, instance, ...) \
56 ((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
58 #define alloc_screen_info(x...) &screen_info
59 #define free_screen_info(x...)
61 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
65 #define EFI_ALLOC_ALIGN SZ_64K
68 * On ARM systems, virtually remapped UEFI runtime services are set up in two
70 * - The stub retrieves the final version of the memory map from UEFI, populates
71 * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
72 * service to communicate the new mapping to the firmware (Note that the new
73 * mapping is not live at this time)
74 * - During an early initcall(), the EFI system table is permanently remapped
75 * and the virtual remapping of the UEFI Runtime Services regions is loaded
76 * into a private set of page tables. If this all succeeds, the Runtime
77 * Services are enabled and the EFI_RUNTIME_SERVICES bit set.
80 static inline void efi_set_pgd(struct mm_struct *mm)
84 if (system_uses_ttbr0_pan()) {
85 if (mm != current->active_mm) {
87 * Update the current thread's saved ttbr0 since it is
88 * restored as part of a return from exception. Set
89 * the hardware TTBR0_EL1 using cpu_switch_mm()
90 * directly to enable potential errata workarounds.
92 update_saved_ttbr0(current, mm);
93 cpu_switch_mm(mm->pgd, mm);
96 * Defer the switch to the current thread's TTBR0_EL1
97 * until uaccess_enable(). Restore the current
98 * thread's saved ttbr0 corresponding to its active_mm
99 * (if different from init_mm).
101 cpu_set_reserved_ttbr0();
102 if (current->active_mm != &init_mm)
103 update_saved_ttbr0(current, current->active_mm);
108 void efi_virtmap_load(void);
109 void efi_virtmap_unload(void);
111 #endif /* _ASM_EFI_H */