1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <asm/cpufeature.h>
7 #include <asm/fpsimd.h>
9 #include <asm/memory.h>
10 #include <asm/mmu_context.h>
12 #include <asm/ptrace.h>
13 #include <asm/tlbflush.h>
16 extern void efi_init(void);
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);
24 #define arch_efi_call_virt_setup() \
27 __efi_fpsimd_begin(); \
30 #define arch_efi_call_virt(p, f, args...) \
34 __efi_rt_asm_wrapper(__f, #f, args); \
37 #define arch_efi_call_virt_teardown() \
40 efi_virtmap_unload(); \
43 efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...);
45 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
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.
52 #define arch_efi_save_flags(state_flags) \
53 ((void)((state_flags) = read_sysreg(daif)))
55 #define arch_efi_restore_flags(state_flags) write_sysreg(state_flags, daif)
58 /* arch specific definitions used by the stub code */
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.
64 #define EFI_KIMG_ALIGN \
65 (SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN)
67 /* on arm64, the FDT may be located anywhere in system RAM */
68 static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
74 * On arm64, we have to ensure that the initrd ends up in the linear region,
75 * which is a 1 GB aligned region of size '1UL << (VA_BITS_MIN - 1)' that is
76 * guaranteed to cover the kernel Image.
78 * Since the EFI stub is part of the kernel Image, we can relax the
79 * usual requirements in Documentation/arm64/booting.rst, which still
80 * apply to other bootloaders, and are required for some kernel
83 static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
84 unsigned long image_addr)
86 return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS_MIN - 1));
89 #define alloc_screen_info(x...) &screen_info
91 static inline void free_screen_info(struct screen_info *si)
95 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
99 #define EFI_ALLOC_ALIGN SZ_64K
102 * On ARM systems, virtually remapped UEFI runtime services are set up in two
104 * - The stub retrieves the final version of the memory map from UEFI, populates
105 * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
106 * service to communicate the new mapping to the firmware (Note that the new
107 * mapping is not live at this time)
108 * - During an early initcall(), the EFI system table is permanently remapped
109 * and the virtual remapping of the UEFI Runtime Services regions is loaded
110 * into a private set of page tables. If this all succeeds, the Runtime
111 * Services are enabled and the EFI_RUNTIME_SERVICES bit set.
114 static inline void efi_set_pgd(struct mm_struct *mm)
118 if (system_uses_ttbr0_pan()) {
119 if (mm != current->active_mm) {
121 * Update the current thread's saved ttbr0 since it is
122 * restored as part of a return from exception. Enable
123 * access to the valid TTBR0_EL1 and invoke the errata
124 * workaround directly since there is no return from
125 * exception when invoking the EFI run-time services.
127 update_saved_ttbr0(current, mm);
128 uaccess_ttbr0_enable();
129 post_ttbr_update_workaround();
132 * Defer the switch to the current thread's TTBR0_EL1
133 * until uaccess_enable(). Restore the current
134 * thread's saved ttbr0 corresponding to its active_mm
136 uaccess_ttbr0_disable();
137 update_saved_ttbr0(current, current->active_mm);
142 void efi_virtmap_load(void);
143 void efi_virtmap_unload(void);
145 #endif /* _ASM_EFI_H */