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);
17 extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
22 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
23 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
25 #define arch_efi_call_virt_setup() \
28 __efi_fpsimd_begin(); \
31 #define arch_efi_call_virt(p, f, args...) \
35 __efi_rt_asm_wrapper(__f, #f, args); \
38 #define arch_efi_call_virt_teardown() \
41 efi_virtmap_unload(); \
44 efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...);
46 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
49 * Even when Linux uses IRQ priorities for IRQ disabling, EFI does not.
50 * And EFI shouldn't really play around with priority masking as it is not aware
51 * which priorities the OS has assigned to its interrupts.
53 #define arch_efi_save_flags(state_flags) \
54 ((void)((state_flags) = read_sysreg(daif)))
56 #define arch_efi_restore_flags(state_flags) write_sysreg(state_flags, daif)
59 /* arch specific definitions used by the stub code */
62 * In some configurations (e.g. VMAP_STACK && 64K pages), stacks built into the
63 * kernel need greater alignment than we require the segments to be padded to.
65 #define EFI_KIMG_ALIGN \
66 (SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN)
69 * On arm64, we have to ensure that the initrd ends up in the linear region,
70 * which is a 1 GB aligned region of size '1UL << (VA_BITS_MIN - 1)' that is
71 * guaranteed to cover the kernel Image.
73 * Since the EFI stub is part of the kernel Image, we can relax the
74 * usual requirements in Documentation/arm64/booting.rst, which still
75 * apply to other bootloaders, and are required for some kernel
78 static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
80 return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS_MIN - 1));
83 #define alloc_screen_info(x...) &screen_info
85 static inline void free_screen_info(struct screen_info *si)
89 #define EFI_ALLOC_ALIGN SZ_64K
92 * On ARM systems, virtually remapped UEFI runtime services are set up in two
94 * - The stub retrieves the final version of the memory map from UEFI, populates
95 * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
96 * service to communicate the new mapping to the firmware (Note that the new
97 * mapping is not live at this time)
98 * - During an early initcall(), the EFI system table is permanently remapped
99 * and the virtual remapping of the UEFI Runtime Services regions is loaded
100 * into a private set of page tables. If this all succeeds, the Runtime
101 * Services are enabled and the EFI_RUNTIME_SERVICES bit set.
104 static inline void efi_set_pgd(struct mm_struct *mm)
108 if (system_uses_ttbr0_pan()) {
109 if (mm != current->active_mm) {
111 * Update the current thread's saved ttbr0 since it is
112 * restored as part of a return from exception. Enable
113 * access to the valid TTBR0_EL1 and invoke the errata
114 * workaround directly since there is no return from
115 * exception when invoking the EFI run-time services.
117 update_saved_ttbr0(current, mm);
118 uaccess_ttbr0_enable();
119 post_ttbr_update_workaround();
122 * Defer the switch to the current thread's TTBR0_EL1
123 * until uaccess_enable(). Restore the current
124 * thread's saved ttbr0 corresponding to its active_mm
126 uaccess_ttbr0_disable();
127 update_saved_ttbr0(current, current->active_mm);
132 void efi_virtmap_load(void);
133 void efi_virtmap_unload(void);
135 static inline void efi_capsule_flush_cache_range(void *addr, int size)
137 dcache_clean_inval_poc((unsigned long)addr, (unsigned long)addr + size);
140 #endif /* _ASM_EFI_H */