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