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Linux/arch/arm64/include/asm/efi.h

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  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 /* arch specific definitions used by the stub code */
 48 
 49 /*
 50  * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
 51  * start of kernel and may not cross a 2MiB boundary. We set alignment to
 52  * 2MiB so we know it won't cross a 2MiB boundary.
 53  */
 54 #define EFI_FDT_ALIGN   SZ_2M   /* used by allocate_new_fdt_and_exit_boot() */
 55 
 56 /*
 57  * In some configurations (e.g. VMAP_STACK && 64K pages), stacks built into the
 58  * kernel need greater alignment than we require the segments to be padded to.
 59  */
 60 #define EFI_KIMG_ALIGN  \
 61         (SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN)
 62 
 63 /* on arm64, the FDT may be located anywhere in system RAM */
 64 static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
 65 {
 66         return ULONG_MAX;
 67 }
 68 
 69 /*
 70  * On arm64, we have to ensure that the initrd ends up in the linear region,
 71  * which is a 1 GB aligned region of size '1UL << (VA_BITS - 1)' that is
 72  * guaranteed to cover the kernel Image.
 73  *
 74  * Since the EFI stub is part of the kernel Image, we can relax the
 75  * usual requirements in Documentation/arm64/booting.txt, which still
 76  * apply to other bootloaders, and are required for some kernel
 77  * configurations.
 78  */
 79 static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
 80                                                     unsigned long image_addr)
 81 {
 82         return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS - 1));
 83 }
 84 
 85 #define efi_call_early(f, ...)          sys_table_arg->boottime->f(__VA_ARGS__)
 86 #define __efi_call_early(f, ...)        f(__VA_ARGS__)
 87 #define efi_call_runtime(f, ...)        sys_table_arg->runtime->f(__VA_ARGS__)
 88 #define efi_is_64bit()                  (true)
 89 
 90 #define efi_call_proto(protocol, f, instance, ...)                      \
 91         ((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
 92 
 93 #define alloc_screen_info(x...)         &screen_info
 94 #define free_screen_info(x...)
 95 
 96 /* redeclare as 'hidden' so the compiler will generate relative references */
 97 extern struct screen_info screen_info __attribute__((__visibility__("hidden")));
 98 
 99 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
100 {
101 }
102 
103 #define EFI_ALLOC_ALIGN         SZ_64K
104 
105 /*
106  * On ARM systems, virtually remapped UEFI runtime services are set up in two
107  * distinct stages:
108  * - The stub retrieves the final version of the memory map from UEFI, populates
109  *   the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
110  *   service to communicate the new mapping to the firmware (Note that the new
111  *   mapping is not live at this time)
112  * - During an early initcall(), the EFI system table is permanently remapped
113  *   and the virtual remapping of the UEFI Runtime Services regions is loaded
114  *   into a private set of page tables. If this all succeeds, the Runtime
115  *   Services are enabled and the EFI_RUNTIME_SERVICES bit set.
116  */
117 
118 static inline void efi_set_pgd(struct mm_struct *mm)
119 {
120         __switch_mm(mm);
121 
122         if (system_uses_ttbr0_pan()) {
123                 if (mm != current->active_mm) {
124                         /*
125                          * Update the current thread's saved ttbr0 since it is
126                          * restored as part of a return from exception. Enable
127                          * access to the valid TTBR0_EL1 and invoke the errata
128                          * workaround directly since there is no return from
129                          * exception when invoking the EFI run-time services.
130                          */
131                         update_saved_ttbr0(current, mm);
132                         uaccess_ttbr0_enable();
133                         post_ttbr_update_workaround();
134                 } else {
135                         /*
136                          * Defer the switch to the current thread's TTBR0_EL1
137                          * until uaccess_enable(). Restore the current
138                          * thread's saved ttbr0 corresponding to its active_mm
139                          */
140                         uaccess_ttbr0_disable();
141                         update_saved_ttbr0(current, current->active_mm);
142                 }
143         }
144 }
145 
146 void efi_virtmap_load(void);
147 void efi_virtmap_unload(void);
148 
149 #endif /* _ASM_EFI_H */
150 

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