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 #else 18 #define efi_init() 19 #endif 20 21 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); 22 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md); 23 24 #define arch_efi_call_virt_setup() \ 25 ({ \ 26 efi_virtmap_load(); \ 27 __efi_fpsimd_begin(); \ 28 }) 29 30 #define arch_efi_call_virt(p, f, args...) \ 31 ({ \ 32 efi_##f##_t *__f; \ 33 __f = p->f; \ 34 __efi_rt_asm_wrapper(__f, #f, args); \ 35 }) 36 37 #define arch_efi_call_virt_teardown() \ 38 ({ \ 39 __efi_fpsimd_end(); \ 40 efi_virtmap_unload(); \ 41 }) 42 43 efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...); 44 45 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT) 46 47 /* 48 * Even when Linux uses IRQ priorities for IRQ disabling, EFI does not. 49 * And EFI shouldn't really play around with priority masking as it is not aware 50 * which priorities the OS has assigned to its interrupts. 51 */ 52 #define arch_efi_save_flags(state_flags) \ 53 ((void)((state_flags) = read_sysreg(daif))) 54 55 #define arch_efi_restore_flags(state_flags) write_sysreg(state_flags, daif) 56 57 58 /* arch specific definitions used by the stub code */ 59 60 /* 61 * In some configurations (e.g. VMAP_STACK && 64K pages), stacks built into the 62 * kernel need greater alignment than we require the segments to be padded to. 63 */ 64 #define EFI_KIMG_ALIGN \ 65 (SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN) 66 67 /* 68 * On arm64, we have to ensure that the initrd ends up in the linear region, 69 * which is a 1 GB aligned region of size '1UL << (VA_BITS_MIN - 1)' that is 70 * guaranteed to cover the kernel Image. 71 * 72 * Since the EFI stub is part of the kernel Image, we can relax the 73 * usual requirements in Documentation/arm64/booting.rst, which still 74 * apply to other bootloaders, and are required for some kernel 75 * configurations. 76 */ 77 static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr) 78 { 79 return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS_MIN - 1)); 80 } 81 82 #define alloc_screen_info(x...) &screen_info 83 84 static inline void free_screen_info(struct screen_info *si) 85 { 86 } 87 88 #define EFI_ALLOC_ALIGN SZ_64K 89 90 /* 91 * On ARM systems, virtually remapped UEFI runtime services are set up in two 92 * distinct stages: 93 * - The stub retrieves the final version of the memory map from UEFI, populates 94 * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime 95 * service to communicate the new mapping to the firmware (Note that the new 96 * mapping is not live at this time) 97 * - During an early initcall(), the EFI system table is permanently remapped 98 * and the virtual remapping of the UEFI Runtime Services regions is loaded 99 * into a private set of page tables. If this all succeeds, the Runtime 100 * Services are enabled and the EFI_RUNTIME_SERVICES bit set. 101 */ 102 103 static inline void efi_set_pgd(struct mm_struct *mm) 104 { 105 __switch_mm(mm); 106 107 if (system_uses_ttbr0_pan()) { 108 if (mm != current->active_mm) { 109 /* 110 * Update the current thread's saved ttbr0 since it is 111 * restored as part of a return from exception. Enable 112 * access to the valid TTBR0_EL1 and invoke the errata 113 * workaround directly since there is no return from 114 * exception when invoking the EFI run-time services. 115 */ 116 update_saved_ttbr0(current, mm); 117 uaccess_ttbr0_enable(); 118 post_ttbr_update_workaround(); 119 } else { 120 /* 121 * Defer the switch to the current thread's TTBR0_EL1 122 * until uaccess_enable(). Restore the current 123 * thread's saved ttbr0 corresponding to its active_mm 124 */ 125 uaccess_ttbr0_disable(); 126 update_saved_ttbr0(current, current->active_mm); 127 } 128 } 129 } 130 131 void efi_virtmap_load(void); 132 void efi_virtmap_unload(void); 133 134 static inline void efi_capsule_flush_cache_range(void *addr, int size) 135 { 136 dcache_clean_inval_poc((unsigned long)addr, (unsigned long)addr + size); 137 } 138 139 #endif /* _ASM_EFI_H */ 140