Add in function description and comments.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1026 6f19259b-4bc3-4df7-8a09-765794883524

EdkModulePkg/Universal/PCD/Dxe/Pcd.c

@@ -80,10 +80,6 @@ PcdDxeInit (
 
   BuildPcdDxeDataBase ();
 
-  //
-  // BugBug Check if PcdDatabase is already installed.
-  //
-  
   Status = gBS->InstallProtocolInterface (
                   &NewHandle,
                   &gPcdProtocolGuid,

EdkModulePkg/Universal/PCD/Dxe/Pcd.dxs

@@ -11,7 +11,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 Module Name:
 
-  PcdEmulator.dxs
+  Pcd.dxs
 
 Abstract:
 

EdkModulePkg/Universal/PCD/Dxe/Service.c

@@ -1,5 +1,5 @@
 /** @file
-Private functions used by PCD DXE driver.s
+Private functions used by PCD DXE driver.
 
 Copyright (c) 2006, Intel Corporation
 All rights reserved. This program and the accompanying materials
@@ -17,11 +17,6 @@ Module Name: Service.c
 #include "Service.h"
 
 
-//
-// Build Tool will generate DXE_PCD_DB_INIT_VALUE in Autogen.h
-// Compression Algorithm will take care of the size optimization.
-//
-
 PCD_DATABASE * mPcdDatabase;
 
 LIST_ENTRY *mCallbackFnTable;
@@ -341,7 +336,6 @@ BuildPcdDxeDataBase (
   ASSERT (mPcdDatabase != NULL);
 
   GuidHob = GetFirstGuidHob (&gPcdDataBaseHobGuid);
-
   if (GuidHob != NULL) {
 
     //

EdkModulePkg/Universal/PCD/Pei/Pcd.dxs

@@ -11,7 +11,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 Module Name:
 
-  PcdEmulator.dxs
+  Pcd.dxs
 
 Abstract:
 

EdkModulePkg/Universal/PCD/Pei/Service.c

@@ -20,12 +20,15 @@ Module Name: Service.c
   The function registers the CallBackOnSet fucntion
   according to TokenNumber and EFI_GUID space.
 
-  @param[in]  TokenNumber       The token number.
-  @param[in]  Guid              The GUID space.
-  @param[in]  CallBackFunction  The Callback function to be registered.
+  @param  TokenNumber       The token number.
+  @param  Guid              The GUID space.
+  @param  CallBackFunction  The Callback function to be registered.
+  @param  Register          To register or unregister the callback function.
 
   @retval EFI_SUCCESS If the Callback function is registered.
   @retval EFI_NOT_FOUND If the PCD Entry is not found according to Token Number and GUID space.
+  @retval EFI_OUT_OF_RESOURCES If the callback function can't be registered because there is not free
+                                slot left in the CallbackFnTable.
 --*/
 EFI_STATUS
 PeiRegisterCallBackWorker (
@@ -103,10 +106,9 @@ PeiRegisterCallBackWorker (
 
 
 /**
-  The function builds the PCD database based on the
-  PCD_IMAGE on the flash.
+  The function builds the PCD database.
 
-  @param[in] PcdImageOnFlash  The PCD image on flash.
+  @param VOID
 
   @retval VOID
 --*/
@@ -144,13 +146,13 @@ BuildPcdDatabase (
   The function is provided by PCD PEIM and PCD DXE driver to
   do the work of reading a HII variable from variable service.
 
-  @param[in] VariableGuid     The Variable GUID.
-  @param[in] VariableName     The Variable Name.
-  @param[out] VariableData    The output data.
-  @param[out] VariableSize    The size of the variable.
+  @param VariableGuid     The Variable GUID.
+  @param VariableName     The Variable Name.
+  @param VariableData    The output data.
+  @param VariableSize    The size of the variable.
 
   @retval EFI_SUCCESS         Operation successful.
-  @retval EFI_SUCCESS         Variablel not found.
+  @retval EFI_NOT_FOUND         Variablel not found.
 --*/
 EFI_STATUS
 GetHiiVariable (
@@ -580,6 +582,7 @@ GetWorker (
 }
 
 
+
 UINTN           
 GetExPcdTokenNumber (
   IN CONST EFI_GUID             *Guid,
@@ -635,6 +638,7 @@ GetPcdDatabase (
 }
 
 
+
 SKU_ID *
 GetSkuIdArray (
   IN    UINTN             LocalTokenNumberTableIdx,