[Patch 2/2] BaseTools: a new build option for variable default value generation

["Bob Feng" <bob.c.feng@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3562

Create a new build option to enable vfrcompile to generate Json
format EFI variable information file and read it to generate 
the EFI variable default value binary file.

Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Yuwei Chen <yuwei.chen@intel.com>
---
 BaseTools/Source/Python/AutoGen/DataPipe.py   |   2 +
 .../Source/Python/AutoGen/GenDefaultVar.py    | 498 ++++++++++++++++++
 .../Source/Python/AutoGen/ModuleAutoGen.py    |   9 +
 .../Python/AutoGen/ModuleAutoGenHelper.py     |   4 +
 BaseTools/Source/Python/Common/GlobalData.py  |   5 +
 BaseTools/Source/Python/build/build.py        |  18 +
 BaseTools/Source/Python/build/buildoptions.py |   1 +
 7 files changed, 537 insertions(+)
 create mode 100644 BaseTools/Source/Python/AutoGen/GenDefaultVar.py

diff --git a/BaseTools/Source/Python/AutoGen/DataPipe.py b/BaseTools/Source/Python/AutoGen/DataPipe.py
index 86ac2b928d9c..fa0c36b98f21 100755
--- a/BaseTools/Source/Python/AutoGen/DataPipe.py
+++ b/BaseTools/Source/Python/AutoGen/DataPipe.py
@@ -165,5 +165,7 @@ class MemoryDataPipe(DataPipe):
         self.DataContainer = {"BinCacheSource":GlobalData.gBinCacheSource}
 
         self.DataContainer = {"BinCacheDest":GlobalData.gBinCacheDest}
 
         self.DataContainer = {"EnableGenfdsMultiThread":GlobalData.gEnableGenfdsMultiThread}
+
+        self.DataContainer = {"GenDefaultVarBin": GlobalData.gGenDefaultVarBin}
diff --git a/BaseTools/Source/Python/AutoGen/GenDefaultVar.py b/BaseTools/Source/Python/AutoGen/GenDefaultVar.py
new file mode 100644
index 000000000000..b82cce18ed26
--- /dev/null
+++ b/BaseTools/Source/Python/AutoGen/GenDefaultVar.py
@@ -0,0 +1,498 @@
+import json
+from ctypes import *
+import re
+import copy
+from struct import unpack
+import os
+
+class GUID(Structure):
+    _fields_ = [
+        ('Guid1',            c_uint32),
+        ('Guid2',            c_uint16),
+        ('Guid3',            c_uint16),
+        ('Guid4',            ARRAY(c_uint8, 8)),
+    ]
+
+    def from_list(self, listformat):
+        self.Guid1 = listformat[0]
+        self.Guid2 = listformat[1]
+        self.Guid3 = listformat[2]
+        for i in range(8):
+            self.Guid4[i] = listformat[i+3]
+
+    def __cmp__(self, otherguid):
+        if isinstance(otherguid, GUID):
+            return 1
+        rt = False
+        if self.Guid1 == otherguid.Guid1 and self.Guid2 == otherguid.Guid2 and self.Guid3 == otherguid.Guid3:
+            rt = True
+            for i in range(8):
+                rt = rt & (self.Guid4[i] == otherguid.Guid4[i])
+        return rt
+
+
+class TIME(Structure):
+    _fields_ = [
+        ('Year',             c_uint16),
+        ('Month',            c_uint8),
+        ('Day',              c_uint8),
+        ('Hour',             c_uint8),
+        ('Minute',           c_uint8),
+        ('Second',           c_uint8),
+        ('Pad1',             c_uint8),
+        ('Nanosecond',       c_uint32),
+        ('TimeZone',         c_uint16),
+        ('Daylight',         c_uint8),
+        ('Pad2',             c_uint8),
+    ]
+    def __init__(self):
+        self.Year = 0x0
+        self.Month = 0x0
+        self.Day = 0x0
+        self.Hour = 0x0
+        self.Minute = 0x0
+        self.Second = 0x0
+        self.Pad1 = 0x0
+        self.Nanosecond = 0x0
+        self.TimeZone = 0x0
+        self.Daylight = 0x0
+        self.Pad2 = 0x0
+
+
+EFI_VARIABLE_GUID = [0xddcf3616, 0x3275, 0x4164,
+                     0x98, 0xb6, 0xfe, 0x85, 0x70, 0x7f, 0xfe, 0x7d]
+EFI_AUTHENTICATED_VARIABLE_GUID = [
+    0xaaf32c78, 0x947b, 0x439a, 0xa1, 0x80, 0x2e, 0x14, 0x4e, 0xc3, 0x77, 0x92]
+
+AuthVarGuid = GUID()
+AuthVarGuid.from_list(EFI_AUTHENTICATED_VARIABLE_GUID)
+VarGuid = GUID()
+VarGuid.from_list(EFI_VARIABLE_GUID)
+
+# Variable Store Header Format.
+VARIABLE_STORE_FORMATTED = 0x5a
+# Variable Store Header State.
+VARIABLE_STORE_HEALTHY = 0xfe
+
+
+class VARIABLE_STORE_HEADER(Structure):
+    _fields_ = [
+        ('Signature',                GUID),
+        ('Size',                     c_uint32),
+        ('Format',                   c_uint8),
+        ('State',                    c_uint8),
+        ('Reserved',                 c_uint16),
+        ('Reserved1',                c_uint32),
+    ]
+
+
+# Variable data start flag.
+VARIABLE_DATA = 0x55AA
+
+# Variable State flags.
+VAR_IN_DELETED_TRANSITION = 0xfe
+VAR_DELETED = 0xfd
+VAR_HEADER_VALID_ONLY = 0x7f
+VAR_ADDED = 0x3f
+
+
+class VARIABLE_HEADER(Structure):
+    _fields_ = [
+        ('StartId',                  c_uint16),
+        ('State',                    c_uint8),
+        ('Reserved',                 c_uint8),
+        ('Attributes',               c_uint32),
+        ('NameSize',                 c_uint32),
+        ('DataSize',                 c_uint32),
+        ('VendorGuid',               GUID),
+    ]
+
+
+class AUTHENTICATED_VARIABLE_HEADER(Structure):
+    _fields_ = [
+        ('StartId',                  c_uint16),
+        ('State',                    c_uint8),
+        ('Reserved',                 c_uint8),
+        ('Attributes',               c_uint32),
+        ('MonotonicCount',           c_uint64),
+        ('TimeStamp',                TIME),
+        ('PubKeyIndex',              c_uint32),
+        ('NameSize',                 c_uint32),
+        ('DataSize',                 c_uint32),
+        ('VendorGuid',               GUID),
+    ]
+    _pack_ = 1
+
+
+# Alignment of Variable Data Header in Variable Store region.
+HEADER_ALIGNMENT = 4
+
+
+class DEFAULT_INFO(Structure):
+    _fields_ = [
+        ('DefaultId',                c_uint16),
+        ('BoardId',                  c_uint16),
+    ]
+
+
+class DEFAULT_DATA(Structure):
+    _fields_ = [
+        ('HeaderSize',               c_uint16),
+        ('DefaultInfo',              DEFAULT_INFO),
+    ]
+
+class DELTA_DATA(Structure):
+    _fields_ = [
+        ('Offset', c_uint16),
+        ('Value', c_uint8),
+    ]
+    _pack_ = 1
+
+array_re = re.compile(
+    "(?P<mType>[a-z_A-Z][a-z_A-Z0-9]*)\[(?P<mSize>[1-9][0-9]*)\]")
+
+
+class VarField():
+    def __init__(self):
+        self.Offset = 0
+        self.Value = 0
+        self.Size = 0
+
+    @property
+    def Type(self):
+        if self.Size == 1:
+            return "UINT8"
+        if self.Size == 2:
+            return "UINT16"
+        if self.Size == 4:
+            return "UINT32"
+        if self.Size == 8:
+            return "UINT64"
+
+        return "UINT8"
+
+
+BASIC_TYPE = {
+    "BOOLEAN": 1,
+    "UINT8": 1,
+    "UINT16": 2,
+    "UINT32": 4,
+    "UINT64": 8
+}
+class CStruct():
+
+
+    def __init__(self, typedefs):
+        self.TypeDefs = typedefs
+        self.TypeStack = copy.deepcopy(typedefs)
+        self.finalDefs = {}
+
+    def CalStuctSize(self, sType):
+        rt = 0
+        if sType in BASIC_TYPE:
+            return BASIC_TYPE[sType]
+
+        ma = array_re.match(sType)
+        if ma:
+            mType = ma.group('mType')
+            mSize = ma.group('mSize')
+            rt += int(mSize) * self.CalStuctSize(mType)
+        else:
+            for subType in self.TypeDefs[sType]:
+                rt += self.CalStuctSize(subType['Type'])
+
+        return rt
+
+    def expend(self, fielditem):
+        fieldname = fielditem['Name']
+        fieldType = fielditem['Type']
+        fieldOffset = fielditem['Offset']
+
+        ma = array_re.match(fieldType)
+        if ma:
+            mType = ma.group('mType')
+            mSize = ma.group('mSize')
+            return [{"Name": "%s[%d]" % (fieldname, i), "Type": mType, "Offset": (fieldOffset + i*self.CalStuctSize(mType))} for i in range(int(mSize))]
+        else:
+            return [{"Name": "%s.%s" % (fieldname, item['Name']), "Type":item['Type'], "Offset": (fieldOffset + item['Offset'])} for item in self.TypeDefs[fielditem['Type']]]
+
+    def ExpandTypes(self):
+        if not self.finalDefs:
+            for datatype in self.TypeStack:
+                result = []
+                mTypeStack = self.TypeStack[datatype]
+                while len(mTypeStack) > 0:
+                    item = mTypeStack.pop()
+                    if item['Type'] in self.BASIC_TYPE:
+                        result.append(item)
+                    elif item['Type'] == '(null)':
+                        continue
+                    else:
+                        for expand_item in self.expend(item):
+                            mTypeStack.append(expand_item)
+                self.finalDefs[datatype] = result
+            self.finalDefs
+        return self.finalDefs
+
+def Get_Occupied_Size(FileLength, alignment):
+    if FileLength % alignment == 0:
+        return FileLength
+    return FileLength + (alignment-(FileLength % alignment))
+
+def Occupied_Size(buffer, alignment):
+    FileLength = len(buffer)
+    if FileLength % alignment != 0:
+        buffer += b'\0' * (alignment-(FileLength % alignment))
+    return buffer
+
+def PackStruct(cStruct):
+    length = sizeof(cStruct)
+    p = cast(pointer(cStruct), POINTER(c_char * length))
+    return p.contents.raw
+
+def calculate_delta(default, theother):
+
+    if len(default) - len(theother) != 0:
+        return []
+
+    data_delta = []
+    for i in range(len(default)):
+        if default[i] != theother[i]:
+            data_delta.append([i, theother[i]])
+    return data_delta
+
+class Variable():
+    def __init__(self):
+        self.mAlign = 1
+        self.mTotalSize = 1
+        self.mValue = {}  # {defaultstore: value}
+        self.mBin = {}
+        self.fields = {}  # {defaultstore: fileds}
+        self.delta = {}
+        self.attributes = 0
+        self.mType = ''
+        self.guid = ''
+        self.mName = ''
+        self.cDefs = None
+
+    @property
+    def GuidArray(self):
+
+        guid_array = []
+        guid = self.guid.strip().strip("{").strip("}")
+        for item in guid.split(","):
+            field = item.strip().strip("{").strip("}")
+            guid_array.append(int(field,16))
+        return guid_array
+
+    def update_delta_offset(self,base):
+        for default_id in self.delta:
+            for delta_list in self.delta[default_id]:
+                delta_list[0] += base
+
+    def pack(self):
+
+        for defaultid in self.mValue:
+            var_value = self.mValue[defaultid]
+            auth_var = AUTHENTICATED_VARIABLE_HEADER()
+            auth_var.StartId = VARIABLE_DATA
+            auth_var.State = VAR_ADDED
+            auth_var.Reserved = 0x00
+            auth_var.Attributes = 0x00000007
+            auth_var.MonotonicCount = 0x0
+            auth_var.TimeStamp = TIME()
+            auth_var.PubKeyIndex = 0x0
+            var_name_buffer = self.mName.encode('utf-16le') + b'\0\0'
+            auth_var.NameSize = len(var_name_buffer)
+            auth_var.DataSize = len(var_value)
+            vendor_guid = GUID()
+            vendor_guid.from_list(self.GuidArray)
+            auth_var.VendorGuid = vendor_guid
+
+            self.mBin[defaultid] = PackStruct(auth_var) + Occupied_Size(var_name_buffer + var_value, 4)
+
+    def TypeCheck(self,data_type, data_size):
+        if BASIC_TYPE[data_type] == data_size:
+            return True
+        return False
+
+    def ValueToBytes(self,data_type,data_value,data_size):
+
+        rt = b''
+        if not self.TypeCheck(data_type, data_size):
+            print(data_type,data_value,data_size)
+
+        if data_type == "BOOLEAN" or data_type == 'UINT8':
+            p = cast(pointer(c_uint8(int(data_value,16))), POINTER(c_char * 1))
+            rt = p.contents.raw
+        elif data_type == 'UINT16':
+            p = cast(pointer(c_uint16(int(data_value,16))), POINTER(c_char * 2))
+            rt = p.contents.raw
+        elif data_type == 'UINT32':
+            p = cast(pointer(c_uint32(int(data_value,16))), POINTER(c_char * 4))
+            rt = p.contents.raw
+        elif data_type == 'UINT64':
+            p = cast(pointer(c_uint64(int(data_value,16))), POINTER(c_char * 8))
+            rt = p.contents.raw
+
+        return rt
+
+    def serial(self):
+        for defaultstore in self.fields:
+            vValue = b''
+            vfields = {vf.Offset: vf for vf in self.fields[defaultstore]}
+            i = 0
+            while i < self.mTotalSize:
+                if i in vfields:
+                    vfield = vfields[i]
+                    vValue += self.ValueToBytes(vfield.Type, vfield.Value,vfield.Size)
+                    i += vfield.Size
+                else:
+                    vValue += self.ValueToBytes('UINT8','0x00',1)
+                    i += 1
+
+            self.mValue[defaultstore] = vValue
+        standard_default = self.mValue[0]
+
+        for defaultid in self.mValue:
+            if defaultid == 0:
+                continue
+            others_default = self.mValue[defaultid]
+
+            self.delta.setdefault(defaultid, []).extend(calculate_delta(
+                standard_default, others_default))
+
+class DefaultVariableGenerator():
+    def __init__(self):
+        self.NvVarInfo = []
+
+    def LoadNvVariableInfo(self, VarInfoFilelist):
+
+        VarDataDict = {}
+        DataStruct = {}
+        VarDefine = {}
+        VarAttributes = {}
+        for VarInfoFile in VarInfoFilelist:
+            with open(VarInfoFile.strip(), "r") as fd:
+                data = json.load(fd)
+
+            DataStruct.update(data.get("DataStruct", {}))
+            Data = data.get("Data")
+            VarDefine.update(data.get("VarDefine"))
+            VarAttributes.update(data.get("DataStructAttribute"))
+
+            for vardata in Data:
+                if vardata['VendorGuid'] == 'NA':
+                    continue
+                VarDataDict.setdefault(
+                    (vardata['VendorGuid'], vardata["VarName"]), []).append(vardata)
+
+        cStructDefs = CStruct(DataStruct)
+        for guid, varname in VarDataDict:
+            v = Variable()
+            v.guid = guid
+            vardef = VarDefine.get(varname)
+            if vardef is None:
+                for var in VarDefine:
+                    if VarDefine[var]['Type'] == varname:
+                        vardef = VarDefine[var]
+                        break
+                else:
+                    continue
+            v.attributes = vardef['Attributes']
+            v.mType = vardef['Type']
+            v.mAlign = VarAttributes[v.mType]['Alignment']
+            v.mTotalSize = VarAttributes[v.mType]['TotalSize']
+            v.Struct = DataStruct[v.mType]
+            v.mName = varname
+            v.cDefs = cStructDefs
+            for fieldinfo in VarDataDict.get((guid, varname), []):
+                vf = VarField()
+                vf.Offset = fieldinfo['Offset']
+                vf.Value = fieldinfo['Value']
+                vf.Size = fieldinfo['Size']
+                v.fields.setdefault(
+                    int(fieldinfo['DefaultStore'], 10), []).append(vf)
+            v.serial()
+            v.pack()
+            self.NvVarInfo.append(v)
+
+    def PackDeltaData(self):
+
+        default_id_set = set()
+        for v in self.NvVarInfo:
+            default_id_set |= set(v.mBin.keys())
+
+        if default_id_set:
+            default_id_set.remove(0)
+        delta_buff_set = {}
+        for defaultid in default_id_set:
+            delta_buff = b''
+            for v in self.NvVarInfo:
+                delta_list = v.delta.get(defaultid,[])
+                for delta in delta_list:
+                    delta_data = DELTA_DATA()
+                    delta_data.Offset, delta_data.Value = delta
+                    delta_buff += PackStruct(delta_data)
+            delta_buff_set[defaultid] = delta_buff
+
+        return delta_buff_set
+
+    def PackDefaultData(self):
+
+        default_data_header = DEFAULT_DATA()
+        default_data_header.HeaderSize = sizeof(DEFAULT_DATA)
+        default_data_header.DefaultInfo.DefaultId = 0x0
+        default_data_header.DefaultInfo.BoardId = 0x0
+        default_data_header_buffer = PackStruct(default_data_header)
+
+
+        variable_store = VARIABLE_STORE_HEADER()
+        variable_store.Signature = AuthVarGuid
+
+        variable_store_size = Get_Occupied_Size(sizeof(DEFAULT_DATA) + sizeof(VARIABLE_STORE_HEADER), 4)
+        for v in self.NvVarInfo:
+            variable_store_size += Get_Occupied_Size(len(v.mBin[0]), 4)
+
+        variable_store.Size = variable_store_size
+        variable_store.Format = VARIABLE_STORE_FORMATTED
+        variable_store.State = VARIABLE_STORE_HEALTHY
+        variable_store.Reserved = 0x0
+        variable_store.Reserved2 = 0x0
+
+        variable_storage_header_buffer = PackStruct(variable_store)
+
+        variable_data = b''
+        v_offset = 0
+        for v in self.NvVarInfo:
+            v.update_delta_offset(v_offset)
+            variable_data += Occupied_Size(v.mBin[0],4)
+            v_offset += Get_Occupied_Size(len(v.mBin[0]),4)
+
+
+        final_buff = Occupied_Size(default_data_header_buffer + variable_storage_header_buffer,4) + variable_data
+
+        return final_buff
+
+    def generate(self, jsonlistfile,output_folder):
+        if not os.path.exists(jsonlistfile):
+            return
+        if not os.path.exists(output_folder):
+            os.makedirs(output_folder)
+        try:
+            with open(jsonlistfile,"r") as fd:
+                filelist = fd.readlines()
+            genVar = DefaultVariableGenerator()
+            genVar.LoadNvVariableInfo(filelist)
+            with open(os.path.join(output_folder, "default.bin"), "wb") as fd:
+                fd.write(genVar.PackDefaultData())
+
+            delta_set = genVar.PackDeltaData()
+            for default_id in delta_set:
+                with open(os.path.join(output_folder, "defaultdelta_%s.bin" % default_id), "wb") as fd:
+                    fd.write(delta_set[default_id])
+        except:
+            print("generate varbin file failed")
+
+
+
diff --git a/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py b/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py
index d70b0d7ae828..0daf3352f91b 100755
--- a/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py
+++ b/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py
@@ -433,10 +433,19 @@ class ModuleAutoGen(AutoGen):
     ## Return the directory to store auto-gened source files of the module
     @cached_property
     def DebugDir(self):
         return _MakeDir((self.BuildDir, "DEBUG"))
 
+
+    @cached_property
+    def DefaultVarJsonFiles(self):
+        rt = []
+        for SrcFile in self.SourceFileList:
+            if SrcFile.Ext.lower() == '.vfr':
+                rt.append(os.path.join(self.DebugDir,os.path.join(os.path.dirname(SrcFile.File), "{}_var.json".format(SrcFile.BaseName))))
+        return rt
+
     ## Return the path of custom file
     @cached_property
     def CustomMakefile(self):
         RetVal = {}
         for Type in self.Module.CustomMakefile:
diff --git a/BaseTools/Source/Python/AutoGen/ModuleAutoGenHelper.py b/BaseTools/Source/Python/AutoGen/ModuleAutoGenHelper.py
index 036fdac3d7df..b46d041f58ab 100644
--- a/BaseTools/Source/Python/AutoGen/ModuleAutoGenHelper.py
+++ b/BaseTools/Source/Python/AutoGen/ModuleAutoGenHelper.py
@@ -644,10 +644,14 @@ class PlatformInfo(AutoGenInfo):
                             if Attr != 'PATH':
                                 BuildOptions[ExpandedTool][Attr] += " " + mws.handleWsMacro(Value)
                             else:
                                 BuildOptions[ExpandedTool][Attr] = mws.handleWsMacro(Value)
 
+        if self.DataPipe.Get("GenDefaultVarBin"):
+            if BuildOptions.get('VFR',{}).get('FLAGS'):
+                BuildOptions['VFR']['FLAGS'] += " " + "--variable"
+
         return BuildOptions, BuildRuleOrder
 
     def ApplyLibraryInstance(self,module):
         alldeps = self.DataPipe.Get("DEPS")
         if alldeps is None:
diff --git a/BaseTools/Source/Python/Common/GlobalData.py b/BaseTools/Source/Python/Common/GlobalData.py
index 61ab3f7e24cd..c68ca8fbb3f7 100755
--- a/BaseTools/Source/Python/Common/GlobalData.py
+++ b/BaseTools/Source/Python/Common/GlobalData.py
@@ -88,10 +88,15 @@ gIgnoreSource = False
 #
 gFdfParser = None
 
 BuildOptionPcd = []
 
+#
+# Build flag for generate default variable binary file
+#
+gGenDefaultVarBin = False
+
 #
 # Mixed PCD name dict
 #
 MixedPcd = {}
 
diff --git a/BaseTools/Source/Python/build/build.py b/BaseTools/Source/Python/build/build.py
index 02b489892422..2f6fc6b20faf 100755
--- a/BaseTools/Source/Python/build/build.py
+++ b/BaseTools/Source/Python/build/build.py
@@ -750,10 +750,11 @@ class Build():
         GlobalData.gUseHashCache = BuildOptions.UseHashCache
         GlobalData.gBinCacheDest   = BuildOptions.BinCacheDest
         GlobalData.gBinCacheSource = BuildOptions.BinCacheSource
         GlobalData.gEnableGenfdsMultiThread = not BuildOptions.NoGenfdsMultiThread
         GlobalData.gDisableIncludePathCheck = BuildOptions.DisableIncludePathCheck
+        GlobalData.gGenDefaultVarBin = BuildOptions.GenDefaultVarBin
 
         if GlobalData.gBinCacheDest and not GlobalData.gUseHashCache:
             EdkLogger.error("build", OPTION_NOT_SUPPORTED, ExtraData="--binary-destination must be used together with --hash.")
 
         if GlobalData.gBinCacheSource and not GlobalData.gUseHashCache:
@@ -1459,10 +1460,14 @@ class Build():
             self.BuildModules = []
             return True
 
         # genfds
         if Target == 'fds':
+            if GlobalData.gGenDefaultVarBin:
+                from AutoGen.GenDefaultVar import DefaultVariableGenerator
+                variable_info_filelist = os.path.join(AutoGenObject.BuildDir,"variable_info_filelist.txt")
+                DefaultVariableGenerator().generate(variable_info_filelist,AutoGenObject.FvDir)
             if GenFdsApi(AutoGenObject.GenFdsCommandDict, self.Db):
                 EdkLogger.error("build", COMMAND_FAILURE)
             Threshold = self.GetFreeSizeThreshold()
             if Threshold:
                 self.CheckFreeSizeThreshold(Threshold, AutoGenObject.FvDir)
@@ -2247,10 +2252,19 @@ class Build():
         AutoGenIdFile = os.path.join(GlobalData.gConfDirectory,".AutoGenIdFile.txt")
         with open(AutoGenIdFile,"w") as fw:
             fw.write("Arch=%s\n" % "|".join((Wa.ArchList)))
             fw.write("BuildDir=%s\n" % Wa.BuildDir)
             fw.write("PlatformGuid=%s\n" % str(Wa.AutoGenObjectList[0].Guid))
+        variable_info_filelist = os.path.join(Wa.BuildDir,"variable_info_filelist.txt")
+        vfr_var_json = []
+        if GlobalData.gGenDefaultVarBin:
+            for ma in self.AllModules:
+                vfr_var_json.extend(ma.DefaultVarJsonFiles)
+            SaveFileOnChange(variable_info_filelist, "\n".join(vfr_var_json), False)
+        else:
+            if os.path.exists(variable_info_filelist):
+                os.remove(variable_info_filelist)
 
         if GlobalData.gBinCacheSource:
             BuildModules.extend(self.MakeCacheMiss)
         elif GlobalData.gUseHashCache and not GlobalData.gBinCacheDest:
             BuildModules.extend(self.PreMakeCacheMiss)
@@ -2359,10 +2373,14 @@ class Build():
 
                     if self.Fdf:
                         #
                         # Generate FD image if there's a FDF file found
                         #
+                        if GlobalData.gGenDefaultVarBin:
+                            from AutoGen.GenDefaultVar import DefaultVariableGenerator
+                            variable_info_filelist = os.path.join(Wa.BuildDir,"variable_info_filelist.txt")
+                            DefaultVariableGenerator().generate(variable_info_filelist,Wa.FvDir)
                         GenFdsStart = time.time()
                         if GenFdsApi(Wa.GenFdsCommandDict, self.Db):
                             EdkLogger.error("build", COMMAND_FAILURE)
                         Threshold = self.GetFreeSizeThreshold()
                         if Threshold:
diff --git a/BaseTools/Source/Python/build/buildoptions.py b/BaseTools/Source/Python/build/buildoptions.py
index 39d92cff209d..6886ba7f8eb6 100644
--- a/BaseTools/Source/Python/build/buildoptions.py
+++ b/BaseTools/Source/Python/build/buildoptions.py
@@ -99,7 +99,8 @@ class MyOptionParser():
         Parser.add_option("--hash", action="store_true", dest="UseHashCache", default=False, help="Enable hash-based caching during build process.")
         Parser.add_option("--binary-destination", action="store", type="string", dest="BinCacheDest", help="Generate a cache of binary files in the specified directory.")
         Parser.add_option("--binary-source", action="store", type="string", dest="BinCacheSource", help="Consume a cache of binary files from the specified directory.")
         Parser.add_option("--genfds-multi-thread", action="store_true", dest="GenfdsMultiThread", default=True, help="Enable GenFds multi thread to generate ffs file.")
         Parser.add_option("--no-genfds-multi-thread", action="store_true", dest="NoGenfdsMultiThread", default=False, help="Disable GenFds multi thread to generate ffs file.")
+        Parser.add_option("--gen-default-variable-bin", action="store_true", dest="GenDefaultVarBin", default=False, help="Generate default variable binary file.")
         Parser.add_option("--disable-include-path-check", action="store_true", dest="DisableIncludePathCheck", default=False, help="Disable the include path check for outside of package.")
         self.BuildOption, self.BuildTarget = Parser.parse_args()
-- 
2.18.0.windows.1