Added SecDispatchTable library to allow custom PPIs to be passed up to into PEI Core. This will allow platform specific libraries to do thinks like map hardware devices directly into the emulator.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10882 6f19259b-4bc3-4df7-8a09-765794883524

UnixPkg/Sec/SecMain.c

@@ -543,6 +543,7 @@ Returns:
   EFI_PHYSICAL_ADDRESS        PeiImageAddress;
   EFI_SEC_PEI_HAND_OFF        *SecCoreData;
   UINTN                       PeiStackSize;
+  EFI_PEI_PPI_DESCRIPTOR      *DispatchTable;
 
   //
   // Compute Top Of Memory for Stack and PEI Core Allocations
@@ -596,13 +597,19 @@ Returns:
     return ;
   }
   
+  //
+  // Allow an override for extra PPIs to be passed up to PEI
+  // This is an easy way to enable OS specific customizations
+  //
+  DispatchTable = OverrideDispatchTable (&gPrivateDispatchTable[0]);
+  
   //
   // Transfer control to the PEI Core
   //
   PeiSwitchStacks (
     (SWITCH_STACK_ENTRY_POINT) (UINTN) PeiCoreEntryPoint,
     SecCoreData,
-    (VOID *) (UINTN) ((EFI_PEI_PPI_DESCRIPTOR *) &gPrivateDispatchTable),
+    (VOID *)DispatchTable,
     NULL,
     TopOfStack
     );