forked from Minki/linux
f7d9248942
This refactors the EFI init and runtime code that will be shared between arm64 and ARM so that it can be built for both archs. Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
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* Extensible Firmware Interface
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*
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* Based on Extensible Firmware Interface Specification version 2.4
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*
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* Copyright (C) 2013, 2014 Linaro Ltd.
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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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*/
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#include <linux/dmi.h>
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#include <linux/efi.h>
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#include <linux/init.h>
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#include <asm/efi.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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pteval_t prot_val;
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/*
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* Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
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* executable, everything else can be mapped with the XN bits
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* set.
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*/
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if ((md->attribute & EFI_MEMORY_WB) == 0)
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prot_val = PROT_DEVICE_nGnRE;
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else if (md->type == EFI_RUNTIME_SERVICES_CODE ||
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!PAGE_ALIGNED(md->phys_addr))
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prot_val = pgprot_val(PAGE_KERNEL_EXEC);
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else
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prot_val = pgprot_val(PAGE_KERNEL);
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create_pgd_mapping(mm, md->phys_addr, md->virt_addr,
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md->num_pages << EFI_PAGE_SHIFT,
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__pgprot(prot_val | PTE_NG));
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return 0;
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}
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static int __init arm64_dmi_init(void)
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{
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/*
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* On arm64, DMI depends on UEFI, and dmi_scan_machine() needs to
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* be called early because dmi_id_init(), which is an arch_initcall
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* itself, depends on dmi_scan_machine() having been called already.
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*/
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dmi_scan_machine();
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if (dmi_available)
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dmi_set_dump_stack_arch_desc();
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return 0;
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}
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core_initcall(arm64_dmi_init);
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/*
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* UpdateCapsule() depends on the system being shutdown via
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* ResetSystem().
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*/
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bool efi_poweroff_required(void)
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{
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return efi_enabled(EFI_RUNTIME_SERVICES);
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}
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