MdeModulePkg Variable: Implement variable quota management.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16669 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Include/Guid/VarErrorFlag.h

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+/** @file
+  Variable error flag definitions.
+
+  Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _VARIABLE_ERROR_FLAG_H_
+#define _VARIABLE_ERROR_FLAG_H_
+
+//
+// Before EndOfDxe, the variable indicates the last boot variable error flag,
+// then it means the last boot variable error flag must be got before EndOfDxe.
+// After EndOfDxe, the variable indicates the current boot variable error flag,
+// then it means the current boot variable error flag must be got after EndOfDxe.
+//
+// If the variable is not present, it has the same meaning with VAR_ERROR_FLAG_NO_ERROR.
+//
+#define VAR_ERROR_FLAG_NAME             L"VarErrorFlag"
+
+#define VAR_ERROR_FLAG_NO_ERROR         0xFF // 1111-1111
+#define VAR_ERROR_FLAG_SYSTEM_ERROR     0xEF // 1110-1111
+#define VAR_ERROR_FLAG_USER_ERROR       0xFE // 1111-1110
+
+typedef UINT8 VAR_ERROR_FLAG;
+
+#define EDKII_VAR_ERROR_FLAG_GUID { \
+  0x4b37fe8, 0xf6ae, 0x480b, { 0xbd, 0xd5, 0x37, 0xd9, 0x8c, 0x5e, 0x89, 0xaa } \
+};
+
+extern EFI_GUID gEdkiiVarErrorFlagGuid;
+
+#endif
+