- 根目录:
- arch
- arm64
- include
- asm
- efi.h
#ifndef _ASM_EFI_H
#define _ASM_EFI_H
#include <asm/io.h>
#include <asm/neon.h>
#ifdef CONFIG_EFI
extern void efi_init(void);
extern void efi_virtmap_init(void);
#else
#define efi_init()
#define efi_virtmap_init()
#endif
#define efi_call_virt(f, ...) \
({ \
efi_##f##_t *__f; \
efi_status_t __s; \
\
kernel_neon_begin(); \
efi_virtmap_load(); \
__f = efi.systab->runtime->f; \
__s = __f(__VA_ARGS__); \
efi_virtmap_unload(); \
kernel_neon_end(); \
__s; \
})
#define __efi_call_virt(f, ...) \
({ \
efi_##f##_t *__f; \
\
kernel_neon_begin(); \
efi_virtmap_load(); \
__f = efi.systab->runtime->f; \
__f(__VA_ARGS__); \
efi_virtmap_unload(); \
kernel_neon_end(); \
})
/* arch specific definitions used by the stub code */
/*
* AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
* start of kernel and may not cross a 2MiB boundary. We set alignment to
* 2MiB so we know it won't cross a 2MiB boundary.
*/
#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
#define MAX_FDT_OFFSET SZ_512M
#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
#define EFI_ALLOC_ALIGN SZ_64K
/*
* On ARM systems, virtually remapped UEFI runtime services are set up in three
* distinct stages:
* - The stub retrieves the final version of the memory map from UEFI, populates
* the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
* service to communicate the new mapping to the firmware (Note that the new
* mapping is not live at this time)
* - During early boot, the page tables are allocated and populated based on the
* virt_addr fields in the memory map, but only if all descriptors with the
* EFI_MEMORY_RUNTIME attribute have a non-zero value for virt_addr. If this
* succeeds, the EFI_VIRTMAP flag is set to indicate that the virtual mappings
* have been installed successfully.
* - During an early initcall(), the UEFI Runtime Services are enabled and the
* EFI_RUNTIME_SERVICES bit set if some conditions are met, i.e., we need a
* non-early mapping of the UEFI system table, and we need to have the virtmap
* installed.
*/
#define EFI_VIRTMAP EFI_ARCH_1
void efi_virtmap_load(void);
void efi_virtmap_unload(void);
#endif /* _ASM_EFI_H */