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e5715711a4
Refer to the section 2.1 of tdx-virtual-firmware-design-guide spec, APCI S3 is not supported in TDVF. Therefore, TDVF should not read the S3 status via fw_cfg and always set it as unsupported. spec: https://cdrdv2.intel.com/v1/dl/getContent/733585 Cc: Erdem Aktas <erdemaktas@google.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Min Xu <min.m.xu@intel.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Ceping Sun <cepingx.sun@intel.com>
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/** @file
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Shared code for the PEI fw_cfg and DXE fw_cfg instances of the QemuFwCfgS3Lib
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class.
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Copyright (C) 2017, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseLib.h>
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#include <Library/QemuFwCfgLib.h>
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#include <Library/QemuFwCfgS3Lib.h>
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/**
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Determine if S3 support is explicitly enabled.
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@retval TRUE If S3 support is explicitly enabled. Other functions in this
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library may be called (subject to their individual
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restrictions).
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FALSE Otherwise. This includes unavailability of the firmware
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configuration interface. No other function in this library
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must be called.
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**/
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BOOLEAN
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EFIAPI
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QemuFwCfgS3Enabled (
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VOID
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)
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{
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RETURN_STATUS Status;
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FIRMWARE_CONFIG_ITEM FwCfgItem;
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UINTN FwCfgSize;
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UINT8 SystemStates[6];
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if (TdIsEnabled ()) {
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return FALSE;
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}
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Status = QemuFwCfgFindFile ("etc/system-states", &FwCfgItem, &FwCfgSize);
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if ((Status != RETURN_SUCCESS) || (FwCfgSize != sizeof SystemStates)) {
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return FALSE;
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}
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QemuFwCfgSelectItem (FwCfgItem);
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QemuFwCfgReadBytes (sizeof SystemStates, SystemStates);
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return (BOOLEAN)(SystemStates[3] & BIT7);
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}
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