UefiCpuPkg: Add CpuMmuLib to UefiCpuPkg

Add a new base library named CpuMmuLib and add a LoongArch64 instance
with in the library.

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>
Co-authored-by: Baoqi Zhang <zhangbaoqi@loongson.cn>
Co-authored-by: Dongyan Qian <qiandongyan@loongson.cn>
Co-authored-by: Xianglai Li <lixianglai@loongson.cn>
Co-authored-by: Bibo Mao <maobibo@loongson.cn>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Ray Ni <ray.ni@intel.com>

UefiCpuPkg/Library/CpuMmuLib/LoongArch64/Page.h

@@ -0,0 +1,33 @@
+/** @file
+
+  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef PAGE_H_
+#define PAGE_H_
+
+#define INVALID_PAGE  0
+
+#define LEVEL5  5
+#define LEVEL4  4
+#define LEVEL3  3
+#define LEVEL2  2
+#define LEVEL1  1
+
+#define PTE_ATTRIBUTES_MASK  0x600000000000007EULL
+
+#define PTE_PPN_MASK              0xFFFFFFFFF000ULL
+#define PTE_PPN_SHIFT             EFI_PAGE_SHIFT
+#define LOONGARCH_MMU_PAGE_SHIFT  EFI_PAGE_SHIFT
+
+//
+// For coding convenience, define the maximum valid
+// LoongArch exception.
+// Since UEFI V2.11, it will be present in DebugSupport.h.
+//
+#define MAX_LOONGARCH_EXCEPTION  64
+
+#endif // PAGE_H_