1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_EFI_H 3 #define _ASM_EFI_H 4 5 #include <asm/boot.h> 6 #include <asm/cpufeature.h> 7 #include <asm/fpsimd.h> 8 #include <asm/io.h> 9 #include <asm/memory.h> 10 #include <asm/mmu_context.h> 11 #include <asm/neon.h> 12 #include <asm/ptrace.h> 13 #include <asm/tlbflush.h> 14 15 #ifdef CONFIG_EFI 16 extern void efi_init(void); 17 extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt); 18 #else 19 #define efi_init() 20 #endif 21 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); 24 25 #define arch_efi_call_virt_setup() \ 26 ({ \ 27 efi_virtmap_load(); \ 28 __efi_fpsimd_begin(); \ 29 }) 30 31 #define arch_efi_call_virt(p, f, args...) \ 32 ({ \ 33 efi_##f##_t *__f; \ 34 __f = p->f; \ 35 __efi_rt_asm_wrapper(__f, #f, args); \ 36 }) 37 38 #define arch_efi_call_virt_teardown() \ 39 ({ \ 40 __efi_fpsimd_end(); \ 41 efi_virtmap_unload(); \ 42 }) 43 44 efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...); 45 46 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT) 47 48 /* 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. 52 */ 53 #define arch_efi_save_flags(state_flags) \ 54 ((void)((state_flags) = read_sysreg(daif))) 55 56 #define arch_efi_restore_flags(state_flags) write_sysreg(state_flags, daif) 57 58 59 /* arch specific definitions used by the stub code */ 60 61 /* 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. 64 */ 65 #define EFI_KIMG_ALIGN \ 66 (SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN) 67 68 /* 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. 72 * 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 76 * configurations. 77 */ 78 static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr) 79 { 80 return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS_MIN - 1)); 81 } 82 83 #define alloc_screen_info(x...) &screen_info 84 85 static inline void free_screen_info(struct screen_info *si) 86 { 87 } 88 89 #define EFI_ALLOC_ALIGN SZ_64K 90 91 /* 92 * On ARM systems, virtually remapped UEFI runtime services are set up in two 93 * distinct stages: 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. 102 */ 103 104 static inline void efi_set_pgd(struct mm_struct *mm) 105 { 106 __switch_mm(mm); 107 108 if (system_uses_ttbr0_pan()) { 109 if (mm != current->active_mm) { 110 /* 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. 116 */ 117 update_saved_ttbr0(current, mm); 118 uaccess_ttbr0_enable(); 119 post_ttbr_update_workaround(); 120 } else { 121 /* 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 125 */ 126 uaccess_ttbr0_disable(); 127 update_saved_ttbr0(current, current->active_mm); 128 } 129 } 130 } 131 132 void efi_virtmap_load(void); 133 void efi_virtmap_unload(void); 134 135 static inline void efi_capsule_flush_cache_range(void *addr, int size) 136 { 137 dcache_clean_inval_poc((unsigned long)addr, (unsigned long)addr + size); 138 } 139 140 #endif /* _ASM_EFI_H */ 141