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.S

@@ -0,0 +1,65 @@
+//
+//  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>
+
+#start of the code section
+.text
+.align 3
+
+#global symbols referenced by this module
+GCC_ASM_IMPORT(CEntryPoint)
+
+StartupAddr: .word    CEntryPoint
+
+#make _ModuleEntryPoint as global
+GCC_ASM_EXPORT(_ModuleEntryPoint)
+
+
+ASM_PFX(_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
+
+  # lr points to area in reset vector block containing PEI core address. lr needs to
+  # be saved from the beginning as the _ModuleEntryPoint could call helper functions
+  # that will overwrite 'lr'
+  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 of the file
+.end