diff options
Diffstat (limited to 'OvmfPkg/SmbiosPlatformDxe/Xen.c')
-rw-r--r-- | OvmfPkg/SmbiosPlatformDxe/Xen.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/OvmfPkg/SmbiosPlatformDxe/Xen.c b/OvmfPkg/SmbiosPlatformDxe/Xen.c new file mode 100644 index 0000000000..93b8f74366 --- /dev/null +++ b/OvmfPkg/SmbiosPlatformDxe/Xen.c @@ -0,0 +1,63 @@ +/** @file + Detect Xen hvmloader SMBIOS data for usage by OVMF. + + Copyright (c) 2011, Bei Guan <gbtju85@gmail.com> + Copyright (c) 2011, Intel Corporation. All rights reserved.<BR> + + 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/HobLib.h> +#include <Guid/XenInfo.h> + +#define XEN_SMBIOS_PHYSICAL_ADDRESS 0x000EB000 +#define XEN_SMBIOS_PHYSICAL_END 0x000F0000 + +/** + Locates the Xen SMBIOS data if it exists + + @return SMBIOS_TABLE_ENTRY_POINT Address of Xen SMBIOS data + +**/ +SMBIOS_TABLE_ENTRY_POINT * +GetXenSmbiosTables ( + VOID + ) +{ + UINT8 *XenSmbiosPtr; + SMBIOS_TABLE_ENTRY_POINT *XenSmbiosEntryPointStructure; + EFI_HOB_GUID_TYPE *GuidHob; + + // + // See if a XenInfo HOB is available + // + GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid); + if (GuidHob == NULL) { + return NULL; + } + + for (XenSmbiosPtr = (UINT8*) XEN_SMBIOS_PHYSICAL_ADDRESS; + XenSmbiosPtr < (UINT8*) XEN_SMBIOS_PHYSICAL_END; + XenSmbiosPtr += 0x10) { + + XenSmbiosEntryPointStructure = (SMBIOS_TABLE_ENTRY_POINT *) XenSmbiosPtr; + + if (!AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->AnchorString, "_SM_", 4) && + !AsciiStrnCmp ((CHAR8 *) XenSmbiosEntryPointStructure->IntermediateAnchorString, "_DMI_", 5) && + IsEntryPointStructureValid (XenSmbiosEntryPointStructure)) { + + return XenSmbiosEntryPointStructure; + + } + } + + return NULL; +} |