5 #include <asm/cpufeature.h>
6 #include <asm/fpsimd.h>
8 #include <asm/memory.h>
9 #include <asm/mmu_context.h>
11 #include <asm/ptrace.h>
12 #include <asm/tlbflush.h>
15 extern void efi_init(void);
20 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
21 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
23 #define arch_efi_call_virt_setup() \
26 __efi_fpsimd_begin(); \
29 #define arch_efi_call_virt(p, f, args...) \
36 #define arch_efi_call_virt_teardown() \
39 efi_virtmap_unload(); \
42 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
44 /* arch specific definitions used by the stub code */
47 * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
48 * start of kernel and may not cross a 2MiB boundary. We set alignment to
49 * 2MiB so we know it won't cross a 2MiB boundary.
51 #define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
54 * In some configurations (e.g. VMAP_STACK && 64K pages), stacks built into the
55 * kernel need greater alignment than we require the segments to be padded to.
57 #define EFI_KIMG_ALIGN \
58 (SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN)
60 /* on arm64, the FDT may be located anywhere in system RAM */
61 static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
67 * On arm64, we have to ensure that the initrd ends up in the linear region,
68 * which is a 1 GB aligned region of size '1UL << (VA_BITS - 1)' that is
69 * guaranteed to cover the kernel Image.
71 * Since the EFI stub is part of the kernel Image, we can relax the
72 * usual requirements in Documentation/arm64/booting.txt, which still
73 * apply to other bootloaders, and are required for some kernel
76 static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
77 unsigned long image_addr)
79 return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS - 1));
82 #define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
83 #define __efi_call_early(f, ...) f(__VA_ARGS__)
84 #define efi_call_runtime(f, ...) sys_table_arg->runtime->f(__VA_ARGS__)
85 #define efi_is_64bit() (true)
87 #define efi_call_proto(protocol, f, instance, ...) \
88 ((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
90 #define alloc_screen_info(x...) &screen_info
91 #define free_screen_info(x...)
93 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
97 #define EFI_ALLOC_ALIGN SZ_64K
100 * On ARM systems, virtually remapped UEFI runtime services are set up in two
102 * - The stub retrieves the final version of the memory map from UEFI, populates
103 * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
104 * service to communicate the new mapping to the firmware (Note that the new
105 * mapping is not live at this time)
106 * - During an early initcall(), the EFI system table is permanently remapped
107 * and the virtual remapping of the UEFI Runtime Services regions is loaded
108 * into a private set of page tables. If this all succeeds, the Runtime
109 * Services are enabled and the EFI_RUNTIME_SERVICES bit set.
112 static inline void efi_set_pgd(struct mm_struct *mm)
116 if (system_uses_ttbr0_pan()) {
117 if (mm != current->active_mm) {
119 * Update the current thread's saved ttbr0 since it is
120 * restored as part of a return from exception. Set
121 * the hardware TTBR0_EL1 using cpu_switch_mm()
122 * directly to enable potential errata workarounds.
124 update_saved_ttbr0(current, mm);
125 cpu_switch_mm(mm->pgd, mm);
128 * Defer the switch to the current thread's TTBR0_EL1
129 * until uaccess_enable(). Restore the current
130 * thread's saved ttbr0 corresponding to its active_mm
131 * (if different from init_mm).
133 cpu_set_reserved_ttbr0();
134 if (current->active_mm != &init_mm)
135 update_saved_ttbr0(current, current->active_mm);
140 void efi_virtmap_load(void);
141 void efi_virtmap_unload(void);
143 #endif /* _ASM_EFI_H */