b26f0cf9ee
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
93 lines
2.3 KiB
C
93 lines
2.3 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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SPDX-License-Identifier: BSD-2-Clause-Patent
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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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