[edk2-devel] [PATCH v4 10/13] UefiCpuPkg: Add a new GUID to store the processors resource

["Chao Li" <lichao@loongson.cn>]

On a multi-processor system, if the BSP dose not know how many APs are
online or cannot wake up the AP via broadcast, it can collect AP
resouces before wakeing up the AP and add a new HOB to save the
processor resouces.

Cc: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Chao Li <lichao@loongson.cn>
---
 .../Include/Guid/ProcessorResourceHob.h       | 29 +++++++++++++++++++
 UefiCpuPkg/UefiCpuPkg.dec                     |  3 ++
 2 files changed, 32 insertions(+)
 create mode 100644 UefiCpuPkg/Include/Guid/ProcessorResourceHob.h

diff --git a/UefiCpuPkg/Include/Guid/ProcessorResourceHob.h b/UefiCpuPkg/Include/Guid/ProcessorResourceHob.h
new file mode 100644
index 0000000000..9890cc3ea9
--- /dev/null
+++ b/UefiCpuPkg/Include/Guid/ProcessorResourceHob.h
@@ -0,0 +1,29 @@
+/** @file
+  Processor resource HOB
+
+  If BSP does not known how many cores are online or the platform cannot
+  wake up AP via broadcast, this HOB can be used to store the processor
+  resource data that may come from ACPI or FDT, etc.
+
+  Copyright (c) 2024, Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef PROCESSOR_RESOURCE_HOB_H_
+#define PROCESSOR_RESOURCE_HOB_H_
+
+#define PROCESSOR_RESOURCE_HOB_GUID \
+  { \
+    0xb855c7fe, 0xa758, 0x701f, { 0xa7, 0x30, 0x87, 0xf3, 0x9c, 0x03, 0x46, 0x7e } \
+  }
+
+typedef struct {
+  UINT32    NumberOfProcessor;
+  UINTN     ApicId[];
+} PROCESSOR_RESOURCE_DATA;
+
+extern EFI_GUID  gProcessorResourceHobGuid;
+
+#endif
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index 1b890e975c..8ca3b7a5a6 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -96,6 +96,9 @@ [Guids]
   ## Include/Guid/MpInformation2.h
   gMpInformation2HobGuid         = { 0x417a7f64, 0xf4e9, 0x4b32, {0x84, 0x6a, 0x5c, 0xc4, 0xd8, 0x62, 0x18, 0x79 }}
 
+  ## Include/Guid/ProcessorResourceHob.h
+  gProcessorResourceHobGuid      = { 0xb855c7fe, 0xa758, 0x701f, { 0xa7, 0x30, 0x87, 0xf3, 0x9c, 0x03, 0x46, 0x7e }}
+
 [Protocols]
   ## Include/Protocol/SmmCpuService.h
   gEfiSmmCpuServiceProtocolGuid   = { 0x1d202cab, 0xc8ab, 0x4d5c, { 0x94, 0xf7, 0x3c, 0xfc, 0xc0, 0xd3, 0xd3, 0x35 }}
-- 
2.27.0



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