mirror of https://github.com/acidanthera/audk.git
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
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/** @file
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Find and extract QEMU SMBIOS data from fw_cfg.
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Copyright (C) 2014, Gabriel L. Somlo <somlo@cmu.edu>
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This program and the accompanying materials are licensed and made
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available under the terms and conditions of the BSD License which
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accompanies this distribution. The full text of the license may
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be found at http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "SmbiosPlatformDxe.h"
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#include <Library/QemuFwCfgLib.h>
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#include <Library/MemoryAllocationLib.h>
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/**
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Locates and extracts the QEMU SMBIOS data if present in fw_cfg
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@return Address of extracted QEMU SMBIOS data
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**/
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UINT8 *
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GetQemuSmbiosTables (
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VOID
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)
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{
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SMBIOS_TABLE_ENTRY_POINT QemuAnchor;
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FIRMWARE_CONFIG_ITEM Anchor, Tables;
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UINTN AnchorSize, TablesSize;
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UINT8 *QemuTables;
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if (EFI_ERROR (QemuFwCfgFindFile (
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"etc/smbios/smbios-anchor", &Anchor, &AnchorSize)) ||
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EFI_ERROR (QemuFwCfgFindFile (
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"etc/smbios/smbios-tables", &Tables, &TablesSize)) ||
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AnchorSize != sizeof (QemuAnchor) ||
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TablesSize == 0) {
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return NULL;
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}
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//
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// We copy the entry point structure to perform some additional checks,
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// but discard it upon return.
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//
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QemuFwCfgSelectItem (Anchor);
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QemuFwCfgReadBytes (AnchorSize, &QemuAnchor);
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if (AsciiStrnCmp ((CHAR8 *)QemuAnchor.AnchorString, "_SM_", 4) ||
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AsciiStrnCmp ((CHAR8 *)QemuAnchor.IntermediateAnchorString, "_DMI_", 5) ||
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TablesSize != QemuAnchor.TableLength) {
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return NULL;
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}
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QemuTables = AllocatePool (TablesSize);
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if (QemuTables == NULL) {
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return NULL;
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}
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QemuFwCfgSelectItem (Tables);
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QemuFwCfgReadBytes (TablesSize, QemuTables);
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return QemuTables;
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}
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