BDS enhancement: enumerate & show all legacy boot options in Boot Manager so that user is able to boot any devices in the same type in Boot Manager without changing the legacy dev order.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11279 6f19259b-4bc3-4df7-8a09-765794883524

IntelFrameworkModulePkg/Universal/BdsDxe/BootMaint/BootMaint.h

@@ -252,13 +252,23 @@ typedef struct {
 } COM_ATTR;
 
 #pragma pack(1)
+///
+/// For each legacy boot option in BBS table, a corresponding Boot#### variables is created.
+/// The structure saves the mapping relationship between #### and the index in the BBS table.
+///
+typedef struct {
+  UINT16    BootOptionNumber;
+  UINT16    BbsIndex;
+  UINT16    BbsType;
+} BOOT_OPTION_BBS_MAPPING;
+
 typedef struct {
   BBS_TYPE  BbsType;
   ///
   /// Length = sizeof (UINT16) + SIZEOF (Data)
   ///
   UINT16    Length;
-  UINT16    *Data;
+  UINT16    Data[1];
 } BM_LEGACY_DEV_ORDER_CONTEXT;
 #pragma pack()
 
@@ -304,10 +314,10 @@ typedef struct {
 } BM_LOAD_CONTEXT;
 
 typedef struct {
-  BBS_TABLE *BbsTable;
-  UINTN     Index;
-  UINTN     BbsCount;
-  UINT16    *Description;
+  BBS_TABLE *BbsEntry;
+  UINT16    BbsIndex;
+  UINT16    BbsCount;
+  CHAR16    *Description;
 } BM_LEGACY_DEVICE_CONTEXT;
 
 typedef struct {