ArmPkg/ProcessorSubClassDxe: Get serial and part number from OemMiscLib

Currently, the serial and part number of a processor are filled with
fixed PCDs. However, they may be updated dynamically according to the
information being passed from a the pre-UEFI firmware during booting.
So, this patch is to support updating these string fields from
OemMiscLib if the PCDs are empty.

Signed-off-by: Nhi Pham <nhi@os.amperecomputing.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

Author: nhivp

ArmPkg/Include/Library/OemMiscLib.h

@@ -56,6 +56,8 @@ typedef enum {
   ChassisTypeType03,
   ManufacturerType03,
   SkuNumberType03,
+  ProcessorPartNumType04,
+  ProcessorSerialNumType04,
   SmbiosHiiStringFieldMax
 } OEM_MISC_SMBIOS_HII_STRING_FIELD;
 

ArmPkg/Universal/Smbios/ProcessorSubClassDxe/ProcessorSubClass.c

@@ -513,9 +513,19 @@ AllocateType4AndSetProcessorInformationStrings (
 
   SET_HII_STRING_IF_PCD_NOT_EMPTY (PcdProcessorManufacturer, ProcessorManu);
   SET_HII_STRING_IF_PCD_NOT_EMPTY (PcdProcessorVersion, ProcessorVersion);
-  SET_HII_STRING_IF_PCD_NOT_EMPTY (PcdProcessorSerialNumber, SerialNumber);
   SET_HII_STRING_IF_PCD_NOT_EMPTY (PcdProcessorAssetTag, AssetTag);
-  SET_HII_STRING_IF_PCD_NOT_EMPTY (PcdProcessorPartNumber, PartNumber);
+
+  if (StrLen ((CHAR16 *)FixedPcdGetPtr (PcdProcessorSerialNumber)) > 0) {
+    HiiSetString (mHiiHandle, SerialNumber, (CHAR16 *)FixedPcdGetPtr (PcdProcessorSerialNumber), NULL);
+  } else {
+    OemUpdateSmbiosInfo (mHiiHandle, SerialNumber, ProcessorSerialNumType04);
+  }
+
+  if (StrLen ((CHAR16 *)FixedPcdGetPtr (PcdProcessorPartNumber)) > 0) {
+    HiiSetString (mHiiHandle, PartNumber, (CHAR16 *)FixedPcdGetPtr (PcdProcessorPartNumber), NULL);
+  } else {
+    OemUpdateSmbiosInfo (mHiiHandle, PartNumber, ProcessorPartNumType04);
+  }
 
   // Processor Designation
   StringBufferSize = sizeof (CHAR16) * SMBIOS_STRING_MAX_LENGTH;