BeagleBoardPkg: Implement ArmPlatformLib and the ARM PCDs to reuse ARM common components on the BeagleBoard.

To build the UEFI BeagleBoard firmware using this ARM framework either use ./build-next.sh
or directly call the EDK2 BaseTools with BeagleBoardPkg-next.dsc.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11998 6f19259b-4bc3-4df7-8a09-765794883524

BeagleBoardPkg/Library/BeagleBoardLib/BeagleBoardHelper.S

@@ -0,0 +1,57 @@
+//
+//  Copyright (c) 2011, ARM Limited. All rights reserved.
+//  
+//  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.             
+//
+//
+
+#include <AsmMacroIoLib.h>
+#include <Base.h>
+#include <Library/PcdLib.h>
+#include <ArmPlatform.h>
+#include <AutoGen.h>
+
+.text
+.align 3
+
+GCC_ASM_EXPORT(ArmPlatformIsBootMemoryInitialized)
+GCC_ASM_EXPORT(ArmPlatformInitializeBootMemory)
+
+/**
+  Called at the early stage of the Boot phase to know if the memory has already been initialized
+
+  Running the code from the reset vector does not mean we start from cold boot. In some case, we
+  can go through this code with the memory already initialized.
+  Because this function is called at the early stage, the implementation must not use the stack.
+  Its implementation must probably done in assembly to ensure this requirement.
+
+  @return   Return a non zero value if initialized
+
+**/
+ASM_PFX(ArmPlatformIsBootMemoryInitialized):
+  // The system memory is initialized by the BeagleBoard firmware
+  mov   r0, #1
+  bx    lr
+
+    
+/**
+  Initialize the memory where the initial stacks will reside
+
+  This memory can contain the initial stacks (Secure and Secure Monitor stacks).
+  In some platform, this region is already initialized and the implementation of this function can
+  do nothing. This memory can also represent the Secure RAM.
+  This function is called before the satck has been set up. Its implementation must ensure the stack
+  pointer is not used (probably required to use assembly language)
+
+**/
+ASM_PFX(ArmPlatformInitializeBootMemory):
+  // We must need to go into this function
+  bx    lr
+
+ASM_FUNCTION_REMOVE_IF_UNREFERENCED