5e4d5b1087
This patch introduces PeiQemuFwCfgS3LibFwCfg, a limited functionality QemuFwCfgS3Lib instance, for PEI phase modules. The patch also introduces DxeQemuFwCfgS3LibFwCfg, a full functionality QemuFwCfgS3Lib instance, for DXE_DRIVER and DXE_RUNTIME_DRIVER modules. These library instances share the QemuFwCfgS3Enabled() function. The function actually uses fw_cfg; the implementation is copied from "OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c". The library instances will diverge in the following patches. Cc: Jordan Justen <jordan.l.justen@intel.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=394 Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
49 lines
1.6 KiB
C
49 lines
1.6 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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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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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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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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