1#ifndef _ASM_EFI_H
2#define _ASM_EFI_H
3
4#include <asm/io.h>
5#include <asm/neon.h>
6
7#ifdef CONFIG_EFI
8extern void efi_init(void);
9#else
10#define efi_init()
11#endif
12
13#define efi_call_virt(f, ...)						\
14({									\
15	efi_##f##_t *__f;						\
16	efi_status_t __s;						\
17									\
18	kernel_neon_begin();						\
19	efi_virtmap_load();						\
20	__f = efi.systab->runtime->f;					\
21	__s = __f(__VA_ARGS__);						\
22	efi_virtmap_unload();						\
23	kernel_neon_end();						\
24	__s;								\
25})
26
27#define __efi_call_virt(f, ...)						\
28({									\
29	efi_##f##_t *__f;						\
30									\
31	kernel_neon_begin();						\
32	efi_virtmap_load();						\
33	__f = efi.systab->runtime->f;					\
34	__f(__VA_ARGS__);						\
35	efi_virtmap_unload();						\
36	kernel_neon_end();						\
37})
38
39/* arch specific definitions used by the stub code */
40
41/*
42 * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
43 * start of kernel and may not cross a 2MiB boundary. We set alignment to
44 * 2MiB so we know it won't cross a 2MiB boundary.
45 */
46#define EFI_FDT_ALIGN	SZ_2M   /* used by allocate_new_fdt_and_exit_boot() */
47#define MAX_FDT_OFFSET	SZ_512M
48
49#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
50
51#define EFI_ALLOC_ALIGN		SZ_64K
52
53/*
54 * On ARM systems, virtually remapped UEFI runtime services are set up in two
55 * distinct stages:
56 * - The stub retrieves the final version of the memory map from UEFI, populates
57 *   the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
58 *   service to communicate the new mapping to the firmware (Note that the new
59 *   mapping is not live at this time)
60 * - During an early initcall(), the EFI system table is permanently remapped
61 *   and the virtual remapping of the UEFI Runtime Services regions is loaded
62 *   into a private set of page tables. If this all succeeds, the Runtime
63 *   Services are enabled and the EFI_RUNTIME_SERVICES bit set.
64 */
65
66void efi_virtmap_load(void);
67void efi_virtmap_unload(void);
68
69#endif /* _ASM_EFI_H */
70