da58fb6571
This adds support to the kernel proper for booting via UEFI. It shares most of the code with arm64, so this patch mostly just wires it up for use with ARM. Note that this does not include the EFI stub, it is added in a subsequent patch. Tested-by: Ryan Harkin <ryan.harkin@linaro.org> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
38 lines
1 KiB
C
38 lines
1 KiB
C
/*
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* Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/efi.h>
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#include <asm/efi.h>
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#include <asm/mach/map.h>
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#include <asm/mmu_context.h>
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int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
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{
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struct map_desc desc = {
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.virtual = md->virt_addr,
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.pfn = __phys_to_pfn(md->phys_addr),
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.length = md->num_pages * EFI_PAGE_SIZE,
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};
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/*
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* Order is important here: memory regions may have all of the
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* bits below set (and usually do), so we check them in order of
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* preference.
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*/
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if (md->attribute & EFI_MEMORY_WB)
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desc.type = MT_MEMORY_RWX;
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else if (md->attribute & EFI_MEMORY_WT)
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desc.type = MT_MEMORY_RWX_NONCACHED;
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else if (md->attribute & EFI_MEMORY_WC)
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desc.type = MT_DEVICE_WC;
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else
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desc.type = MT_DEVICE;
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create_mapping_late(mm, &desc, true);
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return 0;
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}
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