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