Add ArmPlatformPkg from ARM Ltd. patch.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11291 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/PrePeiCore/PrePeiCoreEntryPoint.asm

@@ -0,0 +1,61 @@
+//
+//  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 <AutoGen.h>
+
+  INCLUDE AsmMacroIoLib.inc
+  
+  IMPORT  CEntryPoint
+  EXPORT  _ModuleEntryPoint
+  
+  PRESERVE8
+  AREA    PrePeiCoreEntryPoint, CODE, READONLY
+  
+StartupAddr        DCD      CEntryPoint
+
+SCC_SYS_SW         EQU      0x0004
+
+_ModuleEntryPoint
+  // Identify CPU ID
+  mrc   p15, 0, r0, c0, c0, 5
+  and   r0, #0xf
+
+_SetupStack
+  // Setup Stack for the 4 CPU cores
+  LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackBase) ,r1)
+  LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackSize) ,r2)
+  
+  mov     r3,r0         // r3 = core_id
+  mul     r3,r3,r2      // r3 = core_id * stack_size = offset from the stack base
+  add     r3,r3,r1      // r3 = stack_base + offset
+  add     r3,r3,r2,LSR #1   // r3 = stack_offset + (stack_size/2)   <-- the top half is for the heap
+  mov     sp, r3
+
+  // The PEI Core Entry Point has been computed by GenFV and stored in the second entry of the Reset Vector
+  LoadConstantToReg (FixedPcdGet32(PcdEmbeddedFdBaseAddress), r2)
+  add   r2, r2, #4
+  ldr   r1, [r2]
+
+  // move sec startup address into a data register
+  // ensure we're jumping to FV version of the code (not boot remapped alias)
+  ldr   r2, StartupAddr
+
+  // jump to SEC C code
+  //    r0 = core_id
+  //    r1 = pei_core_address
+  blx   r2
+
+  END