tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _ASM_EFI_H
2#define _ASM_EFI_H
3
4#include <asm/io.h>
5#include <asm/mmu_context.h>
6#include <asm/neon.h>
7#include <asm/ptrace.h>
8#include <asm/tlbflush.h>
9
10#ifdef CONFIG_EFI
11extern void efi_init(void);
12#else
13#define efi_init()
14#endif
15
16int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
17
18#define efi_set_mapping_permissions efi_create_mapping
19
20#define arch_efi_call_virt_setup() \
21({ \
22 kernel_neon_begin(); \
23 efi_virtmap_load(); \
24})
25
26#define arch_efi_call_virt(f, args...) \
27({ \
28 efi_##f##_t *__f; \
29 __f = efi.systab->runtime->f; \
30 __f(args); \
31})
32
33#define arch_efi_call_virt_teardown() \
34({ \
35 efi_virtmap_unload(); \
36 kernel_neon_end(); \
37})
38
39#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
40
41/* arch specific definitions used by the stub code */
42
43/*
44 * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
45 * start of kernel and may not cross a 2MiB boundary. We set alignment to
46 * 2MiB so we know it won't cross a 2MiB boundary.
47 */
48#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
49#define MAX_FDT_OFFSET SZ_512M
50
51#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
52#define __efi_call_early(f, ...) f(__VA_ARGS__)
53#define efi_is_64bit() (true)
54
55#define alloc_screen_info(x...) &screen_info
56#define free_screen_info(x...)
57
58static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
59{
60}
61
62#define EFI_ALLOC_ALIGN SZ_64K
63
64/*
65 * On ARM systems, virtually remapped UEFI runtime services are set up in two
66 * distinct stages:
67 * - The stub retrieves the final version of the memory map from UEFI, populates
68 * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
69 * service to communicate the new mapping to the firmware (Note that the new
70 * mapping is not live at this time)
71 * - During an early initcall(), the EFI system table is permanently remapped
72 * and the virtual remapping of the UEFI Runtime Services regions is loaded
73 * into a private set of page tables. If this all succeeds, the Runtime
74 * Services are enabled and the EFI_RUNTIME_SERVICES bit set.
75 */
76
77static inline void efi_set_pgd(struct mm_struct *mm)
78{
79 switch_mm(NULL, mm, NULL);
80}
81
82void efi_virtmap_load(void);
83void efi_virtmap_unload(void);
84
85#endif /* _ASM_EFI_H */