forked from Minki/linux
60305db988
Now that the create_mapping() code in mm/mmu.c is able to support setting up kernel page tables at initcall time, we can move the whole virtmap creation to arm64_enable_runtime_services() instead of having a distinct stage during early boot. This also allows us to drop the arm64-specific EFI_VIRTMAP flag. Signed-off-by: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
#ifndef _ASM_EFI_H
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#define _ASM_EFI_H
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#include <asm/io.h>
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#include <asm/neon.h>
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#ifdef CONFIG_EFI
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extern void efi_init(void);
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#else
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#define efi_init()
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#endif
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#define efi_call_virt(f, ...) \
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({ \
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efi_##f##_t *__f; \
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efi_status_t __s; \
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\
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kernel_neon_begin(); \
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efi_virtmap_load(); \
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__f = efi.systab->runtime->f; \
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__s = __f(__VA_ARGS__); \
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efi_virtmap_unload(); \
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kernel_neon_end(); \
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__s; \
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})
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#define __efi_call_virt(f, ...) \
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({ \
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efi_##f##_t *__f; \
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\
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kernel_neon_begin(); \
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efi_virtmap_load(); \
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__f = efi.systab->runtime->f; \
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__f(__VA_ARGS__); \
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efi_virtmap_unload(); \
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kernel_neon_end(); \
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})
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/* arch specific definitions used by the stub code */
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/*
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* AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
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* start of kernel and may not cross a 2MiB boundary. We set alignment to
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* 2MiB so we know it won't cross a 2MiB boundary.
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*/
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#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
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#define MAX_FDT_OFFSET SZ_512M
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#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
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#define EFI_ALLOC_ALIGN SZ_64K
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/*
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* On ARM systems, virtually remapped UEFI runtime services are set up in two
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* distinct stages:
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* - The stub retrieves the final version of the memory map from UEFI, populates
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* the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
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* service to communicate the new mapping to the firmware (Note that the new
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* mapping is not live at this time)
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* - During an early initcall(), the EFI system table is permanently remapped
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* and the virtual remapping of the UEFI Runtime Services regions is loaded
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* into a private set of page tables. If this all succeeds, the Runtime
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* Services are enabled and the EFI_RUNTIME_SERVICES bit set.
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*/
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void efi_virtmap_load(void);
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void efi_virtmap_unload(void);
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#endif /* _ASM_EFI_H */
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