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);
18 bool efi_runtime_fixup_exception(struct pt_regs *regs, const char *msg);
23 bool efi_runtime_fixup_exception(struct pt_regs *regs, const char *msg)
29 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
30 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
32 #define arch_efi_call_virt_setup() \
35 __efi_fpsimd_begin(); \
36 spin_lock(&efi_rt_lock); \
39 #undef arch_efi_call_virt
40 #define arch_efi_call_virt(p, f, args...) \
41 __efi_rt_asm_wrapper((p)->f, #f, args)
43 #define arch_efi_call_virt_teardown() \
45 spin_unlock(&efi_rt_lock); \
47 efi_virtmap_unload(); \
50 extern spinlock_t efi_rt_lock;
51 efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...);
53 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
56 * Even when Linux uses IRQ priorities for IRQ disabling, EFI does not.
57 * And EFI shouldn't really play around with priority masking as it is not aware
58 * which priorities the OS has assigned to its interrupts.
60 #define arch_efi_save_flags(state_flags) \
61 ((void)((state_flags) = read_sysreg(daif)))
63 #define arch_efi_restore_flags(state_flags) write_sysreg(state_flags, daif)
66 /* arch specific definitions used by the stub code */
69 * In some configurations (e.g. VMAP_STACK && 64K pages), stacks built into the
70 * kernel need greater alignment than we require the segments to be padded to.
72 #define EFI_KIMG_ALIGN \
73 (SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN)
76 * On arm64, we have to ensure that the initrd ends up in the linear region,
77 * which is a 1 GB aligned region of size '1UL << (VA_BITS_MIN - 1)' that is
78 * guaranteed to cover the kernel Image.
80 * Since the EFI stub is part of the kernel Image, we can relax the
81 * usual requirements in Documentation/arm64/booting.rst, which still
82 * apply to other bootloaders, and are required for some kernel
85 static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
87 return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS_MIN - 1));
90 static inline unsigned long efi_get_kimg_min_align(void)
92 extern bool efi_nokaslr;
95 * Although relocatable kernels can fix up the misalignment with
96 * respect to MIN_KIMG_ALIGN, the resulting virtual text addresses are
97 * subtly out of sync with those recorded in the vmlinux when kaslr is
98 * disabled but the image required relocation anyway. Therefore retain
99 * 2M alignment if KASLR was explicitly disabled, even if it was not
100 * going to be activated to begin with.
102 return efi_nokaslr ? MIN_KIMG_ALIGN : EFI_KIMG_ALIGN;
105 #define EFI_ALLOC_ALIGN SZ_64K
106 #define EFI_ALLOC_LIMIT ((1UL << 48) - 1)
109 * On ARM systems, virtually remapped UEFI runtime services are set up in two
111 * - The stub retrieves the final version of the memory map from UEFI, populates
112 * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
113 * service to communicate the new mapping to the firmware (Note that the new
114 * mapping is not live at this time)
115 * - During an early initcall(), the EFI system table is permanently remapped
116 * and the virtual remapping of the UEFI Runtime Services regions is loaded
117 * into a private set of page tables. If this all succeeds, the Runtime
118 * Services are enabled and the EFI_RUNTIME_SERVICES bit set.
121 static inline void efi_set_pgd(struct mm_struct *mm)
125 if (system_uses_ttbr0_pan()) {
126 if (mm != current->active_mm) {
128 * Update the current thread's saved ttbr0 since it is
129 * restored as part of a return from exception. Enable
130 * access to the valid TTBR0_EL1 and invoke the errata
131 * workaround directly since there is no return from
132 * exception when invoking the EFI run-time services.
134 update_saved_ttbr0(current, mm);
135 uaccess_ttbr0_enable();
136 post_ttbr_update_workaround();
139 * Defer the switch to the current thread's TTBR0_EL1
140 * until uaccess_enable(). Restore the current
141 * thread's saved ttbr0 corresponding to its active_mm
143 uaccess_ttbr0_disable();
144 update_saved_ttbr0(current, current->active_mm);
149 void efi_virtmap_load(void);
150 void efi_virtmap_unload(void);
152 static inline void efi_capsule_flush_cache_range(void *addr, int size)
154 dcache_clean_inval_poc((unsigned long)addr, (unsigned long)addr + size);
157 #endif /* _ASM_EFI_H */