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