mirror of https://github.com/acidanthera/audk.git
99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
/** @file
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Detect Xen hvmloader SMBIOS data for usage by OVMF.
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Copyright (c) 2011, Bei Guan <gbtju85@gmail.com>
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Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this 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,
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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/HobLib.h>
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#include <Guid/XenInfo.h>
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#define XEN_SMBIOS_PHYSICAL_ADDRESS 0x000EB000
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#define XEN_SMBIOS_PHYSICAL_END 0x000F0000
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/**
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Validates the SMBIOS entry point structure
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@param EntryPointStructure SMBIOS entry point structure
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@retval TRUE The entry point structure is valid
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@retval FALSE The entry point structure is not valid
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**/
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STATIC
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BOOLEAN
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IsEntryPointStructureValid (
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IN SMBIOS_TABLE_ENTRY_POINT *EntryPointStructure
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)
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{
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UINTN Index;
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UINT8 Length;
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UINT8 Checksum;
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UINT8 *BytePtr;
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BytePtr = (UINT8*) EntryPointStructure;
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Length = EntryPointStructure->EntryPointLength;
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Checksum = 0;
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for (Index = 0; Index < Length; Index++) {
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Checksum = Checksum + (UINT8) BytePtr[Index];
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}
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if (Checksum != 0) {
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return FALSE;
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} else {
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return TRUE;
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}
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}
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/**
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Locates the Xen SMBIOS data if it exists
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@return SMBIOS_TABLE_ENTRY_POINT Address of Xen SMBIOS data
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**/
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SMBIOS_TABLE_ENTRY_POINT *
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GetXenSmbiosTables (
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VOID
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)
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{
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UINT8 *XenSmbiosPtr;
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SMBIOS_TABLE_ENTRY_POINT *XenSmbiosEntryPointStructure;
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EFI_HOB_GUID_TYPE *GuidHob;
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//
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// See if a XenInfo HOB is available
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//
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GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
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if (GuidHob == NULL) {
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return NULL;
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}
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for (XenSmbiosPtr = (UINT8*)(UINTN) XEN_SMBIOS_PHYSICAL_ADDRESS;
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XenSmbiosPtr < (UINT8*)(UINTN) XEN_SMBIOS_PHYSICAL_END;
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XenSmbiosPtr += 0x10) {
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XenSmbiosEntryPointStructure = (SMBIOS_TABLE_ENTRY_POINT *) XenSmbiosPtr;
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if (!AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->AnchorString, "_SM_", 4) &&
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!AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->IntermediateAnchorString, "_DMI_", 5) &&
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IsEntryPointStructureValid (XenSmbiosEntryPointStructure)) {
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return XenSmbiosEntryPointStructure;
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}
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}
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return NULL;
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}
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