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 */
efi_get_max_initrd_addr(unsigned long image_addr)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
free_screen_info(struct screen_info * si)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
efi_set_pgd(struct mm_struct * mm)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
efi_capsule_flush_cache_range(void * addr,int size)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
