9679be1031
Now that we have moved the call to SetVirtualAddressMap() to the stub, UEFI has no use for the ID map, so we can drop the code that installs ID mappings for UEFI memory regions. Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
77 lines
2.3 KiB
C
77 lines
2.3 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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extern void efi_virtmap_init(void);
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#else
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#define efi_init()
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#define efi_virtmap_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 three
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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 early boot, the page tables are allocated and populated based on the
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* virt_addr fields in the memory map, but only if all descriptors with the
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* EFI_MEMORY_RUNTIME attribute have a non-zero value for virt_addr. If this
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* succeeds, the EFI_VIRTMAP flag is set to indicate that the virtual mappings
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* have been installed successfully.
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* - During an early initcall(), the UEFI Runtime Services are enabled and the
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* EFI_RUNTIME_SERVICES bit set if some conditions are met, i.e., we need a
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* non-early mapping of the UEFI system table, and we need to have the virtmap
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* installed.
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*/
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#define EFI_VIRTMAP EFI_ARCH_1
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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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