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37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
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/** @file
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ARM implementation of architecture specific routines related to
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PersistAcrossReset capsules
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Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
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Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "CapsuleService.h"
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/**
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Whether the platform supports capsules that persist across reset. Note that
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some platforms only support such capsules at boot time.
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@return TRUE if a PersistAcrossReset capsule may be passed to UpdateCapsule()
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at this time
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FALSE otherwise
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**/
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BOOLEAN
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IsPersistAcrossResetCapsuleSupported (
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VOID
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)
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{
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//
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// ARM requires the capsule payload to be cleaned to the point of coherency
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// (PoC), but only permits doing so using cache maintenance instructions that
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// operate on virtual addresses. Since at runtime, we don't know the virtual
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// addresses of the data structures that make up the scatter/gather list, we
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// cannot perform the maintenance, and all we can do is give up.
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//
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return FeaturePcdGet (PcdSupportUpdateCapsuleReset) && !EfiAtRuntime ();
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}
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