66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
/** @file
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This library identifies the firmware boot media device.
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@copyright
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INTEL CONFIDENTIAL
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Copyright 2019 Intel Corporation.
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The source code contained or described herein and all documents related to the
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source code ("Material") are owned by Intel Corporation or its suppliers or
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licensors. Title to the Material remains with Intel Corporation or its suppliers
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and licensors. The Material may contain trade secrets and proprietary and
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confidential information of Intel Corporation and its suppliers and licensors,
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and is protected by worldwide copyright and trade secret laws and treaty
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provisions. No part of the Material may be used, copied, reproduced, modified,
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published, uploaded, posted, transmitted, distributed, or disclosed in any way
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without Intel's prior express written permission.
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No license under any patent, copyright, trade secret or other intellectual
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property right is granted to or conferred upon you by disclosure or delivery
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of the Materials, either expressly, by implication, inducement, estoppel or
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otherwise. Any license under such intellectual property rights must be
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express and approved by Intel in writing.
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Unless otherwise agreed by Intel in writing, you may not remove or alter
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this notice or any other notice embedded in Materials by Intel or
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Intel's suppliers or licensors in any way.
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This file contains a 'Sample Driver' and is licensed as such under the terms
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of your license agreement with Intel or your vendor.This file may be modified
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by the user, subject to the additional terms of the license agreement.
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@par Specification Reference:
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**/
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#include <Library/BaseLib.h>
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#include <Library/FirmwareBootMediaInfoLib.h>
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#include <Library/DebugLib.h>
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#include <CpuRegs.h>
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#include <Library/IoLib.h>
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/**
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Identifies the firmware boot media type for the current boot.
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@retval BOOT_MEDIA_TYPE The boot media type. A value of FwBootMediaTypeMax indicates the firmware boot media
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information is unavailable.
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**/
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FW_BOOT_MEDIA_TYPE
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IdentifyFirmwareBootMediaType (
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VOID
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)
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{
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UINT32 AcmStatusPolicyData;
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//
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// Read the boot device from the upper DWORD of the 64-bit Boot Status register
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//
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AcmStatusPolicyData = MmioRead32 (TXT_PUBLIC_BASE + R_CPU_BOOT_GUARD_BOOTSTATUS + 0x4);
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if ((AcmStatusPolicyData & B_CPU_BOOT_GUARD_BOOTSTATUS_BLOCK_BOOT_ENABLED) == V_CPU_BOOT_GUARD_BOOTSTATUS_BLOCK_BOOT_ENABLED) {
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return FwBootMediaUfs;
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}
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return FwBootMediaSpi;
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}
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