1 files changed, 56 insertions, 0 deletions
diff --git a/UefiCpuPkg/Include/Guid/MpInformation2.h b/UefiCpuPkg/Include/Guid/MpInformation2.h
new file mode 100644
index 0000000000..7a25fcc2f3
--- /dev/null
+++ b/UefiCpuPkg/Include/Guid/MpInformation2.h
@@ -0,0 +1,56 @@
+/** @file
+  EFI MP information protocol provides a lightweight MP_SERVICES_PROTOCOL.
+
+  MP information protocol only provides static information of MP processor.
+
+  If SwitchBSP or Enable/DisableAP in MP service is called between the HOB
+  production and HOB consumption, EFI_PROCESSOR_INFORMATION.StatusFlag field
+  in this HOB may be invalidated.
+
+  Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef MP_INFORMATION2_H_
+#define MP_INFORMATION2_H_
+
+#include <Protocol/MpService.h>
+#include <PiPei.h>
+#include <Ppi/SecPlatformInformation.h>
+
+#define MP_INFORMATION2_HOB_REVISION  1
+
+#define MP_INFORMATION2_GUID \
+  { \
+    0x417a7f64, 0xf4e9, 0x4b32, {0x84, 0x6a, 0x5c, 0xc4, 0xd8, 0x62, 0x18, 0x79}  \
+  }
+
+typedef struct {
+  EFI_PROCESSOR_INFORMATION    ProcessorInfo;
+  //
+  // Add more fields in future
+  //
+} MP_INFORMATION2_ENTRY;
+
+typedef struct {
+  UINT16                   NumberOfProcessors;
+  UINT16                   EntrySize;
+  UINT8                    Version;
+  UINT8                    Reserved[3];
+  UINT64                   ProcessorIndex;
+  MP_INFORMATION2_ENTRY    Entry[0];
+} MP_INFORMATION2_HOB_DATA;
+
+//
+// Producer of MP_INFORMATION2_HOB_DATA should assign sizeof (MP_INFORMATION2_ENTRY) to MP_INFORMATION2_HOB_DATA.EntrySize
+// Consumer of MP_INFORMATION2_HOB_DATA should use below macro or similar logic to get the individual entry
+// as the entry structure might be updated to include more information.
+//
+#define GET_MP_INFORMATION_ENTRY(MpInfoHobData, Index) \
+    (MP_INFORMATION2_ENTRY *)((UINTN)&((MP_INFORMATION2_HOB_DATA *)(MpInfoHobData))->Entry + (MpInfoHobData)->EntrySize * Index)
+
+extern EFI_GUID  gMpInformationHobGuid2;
+
+#endif