Added PcdLoongArchExceptionVectorBaseAddress use for storing the CPU
exception vector base address. This PCD can be populated at build time
or changed at runtime, and is used only by LoongArch.

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4734

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>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
---
 UefiCpuPkg/UefiCpuPkg.dec | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index ca744fab55..1b890e975c 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -3,6 +3,7 @@
 #
 # Copyright (c) 2007 - 2023, Intel Corporation. All rights reserved.<BR>
 # Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.<BR>
+# Copyright (c) 2024, Loongson Technology Corporation Limited. All rights reserved.<BR>
 #
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -414,6 +415,11 @@ [PcdsFixedAtBuild.RISCV64]
   #  10 - 57bit mode.
   gUefiCpuPkgTokenSpaceGuid.PcdCpuRiscVMmuMaxSatpMode|10|UINT32|0x60000021
 
+[PcdsFixedAtBuild.LOONGARCH64, PcdsPatchableInModule.LOONGARCH64, PcdsDynamic.LOONGARCH64, PcdsDynamicEx.LOONGARCH64]
+  ## This PCD Contains the pointer to a CPU exception vector base address.
+  # @Prompt The pointer to a CPU exception vector base address.
+  gUefiCpuPkgTokenSpaceGuid.PcdLoongArchExceptionVectorBaseAddress|0x0|UINT64|0x60000022
+
 [PcdsDynamic, PcdsDynamicEx]
   ## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA.
   # @Prompt The pointer to a CPU S3 data buffer.
--
2.27.0