164cf40383
The Xen code in SmbiosPlatformDxe is centered on the informational HOB with GUID gEfiXenInfoGuid, and the address constants XEN_SMBIOS_PHYSICAL_ADDRESS=0x000EB000, XEN_SMBIOS_PHYSICAL_END=0x000F0000. This Xen hand-off mechanism is specific to the IA32 and X64 architectures, and it is very unlikely that a future ARM / AARCH64 implementation would follow it. Therefore, sequester the IA32 / X64 specific code from the rest of the source, by renaming "Xen.c" to "X86Xen.c", and adding a GetXenSmbiosTables() stub function in "ArmXen.c" that returns NULL. (Those file names are inspired by "OvmfPkg/Library/XenHypercallLib/X86XenHypercall.c".) The call site in SmbiosTablePublishEntry() [SmbiosPlatformDxe.c] is aware that a NULL return value means "Xen SMBIOS tables not found", and will continue to the QEMU tables (for which the retrieval mechanism is shared by x86 and Arm). This change enables SmbiosPlatformDxe for ARM architectures; update the VALID_ARCHITECTURES comment accordingly. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Wei Liu <wei.liu2@citrix.com> Cc: Gabriel Somlo <somlo@cmu.edu> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18040 6f19259b-4bc3-4df7-8a09-765794883524
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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