InOsEmuPkg: Make XIP work properly

Update the InOsEmuPkg to properly function with XIP. Make the Recovery FV read only. Remove the use of global variable writes from XIP code. Add a new global page that can be used in place of writting to the FD by XIP code. Think of this global page as a system SRAM. 

igned-off-by: andrewfish



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11771 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 38 insertions, 0 deletions

diff --git a/InOsEmuPkg/Include/Library/EmuMagicPageLib.h b/InOsEmuPkg/Include/Library/EmuMagicPageLib.h
new file mode 100644
index 0000000000..03dfcacd7a
--- /dev/null
+++ b/InOsEmuPkg/Include/Library/EmuMagicPageLib.h
@@ -0,0 +1,38 @@
+/*++ @file
+The PCD, gInOsEmuPkgTokenSpaceGuid.PcdPeiServicesTablePage, points to a magic page
+of memory that is like SRAM on an embedded system. This file defines what goes 
+where in the magic page.
+
+Copyright (c) 2011, Apple Inc. 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 __EMU_MAGIC_PAGE_LIB_H__
+#define __EMU_MAGIC_PAGE_LIB_H__
+
+#include <PiPei.h>
+#include <Library/PcdLib.h>
+#include <Protocol/EmuThunk.h>
+
+typedef struct {
+  // Used by PEI Core and PEIMs to store the PEI Services pointer.
+  // Privilege issues prevent using the PI mechanism in the emulator. 
+  CONST EFI_PEI_SERVICES **PeiServicesTablePointer;
+  
+  // Used by SecPeiServicesLib
+  EFI_PEI_PPI_DESCRIPTOR  *PpiList;
+  
+  // Needed by PEI PEI PeCoffLoaderExtraActionLib
+  EMU_THUNK_PROTOCOL   *Thunk;
+} EMU_MAGIC_PAGE_LAYOUT;
+
+#define EMU_MAGIC_PAGE() ((EMU_MAGIC_PAGE_LAYOUT *)((UINTN)PcdGet64 (PcdPeiServicesTablePage)))
+
+#endif