Add ArmPlatformPkg from ARM Ltd. patch.

[mirror_edk2.git] / ArmPlatformPkg / PrePeiCore / PrePeiCoreEntryPoint.asm

//\r
//  Copyright (c) 2011, ARM Limited. All rights reserved.\r
//  \r
//  This program and the accompanying materials                          \r
//  are licensed and made available under the terms and conditions of the BSD License         \r
//  which accompanies this distribution.  The full text of the license may be found at        \r
//  http://opensource.org/licenses/bsd-license.php                                            \r
//\r
//  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     \r
//  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             \r
//\r
//\r
\r
#include <AsmMacroIoLib.h>\r
#include <Base.h>\r
#include <Library/PcdLib.h>\r
#include <AutoGen.h>\r
\r
  INCLUDE AsmMacroIoLib.inc\r
  \r
  IMPORT  CEntryPoint\r
  EXPORT  _ModuleEntryPoint\r
  \r
  PRESERVE8\r
  AREA    PrePeiCoreEntryPoint, CODE, READONLY\r
  \r
StartupAddr        DCD      CEntryPoint\r
\r
SCC_SYS_SW         EQU      0x0004\r
\r
_ModuleEntryPoint\r
  // Identify CPU ID\r
  mrc   p15, 0, r0, c0, c0, 5\r
  and   r0, #0xf\r
\r
_SetupStack\r
  // Setup Stack for the 4 CPU cores\r
  LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackBase) ,r1)\r
  LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackSize) ,r2)\r
  \r
  mov     r3,r0         // r3 = core_id\r
  mul     r3,r3,r2      // r3 = core_id * stack_size = offset from the stack base\r
  add     r3,r3,r1      // r3 = stack_base + offset\r
  add     r3,r3,r2,LSR #1   // r3 = stack_offset + (stack_size/2)   <-- the top half is for the heap\r
  mov     sp, r3\r
\r
  // The PEI Core Entry Point has been computed by GenFV and stored in the second entry of the Reset Vector\r
  LoadConstantToReg (FixedPcdGet32(PcdEmbeddedFdBaseAddress), r2)\r
  add   r2, r2, #4\r
  ldr   r1, [r2]\r
\r
  // move sec startup address into a data register\r
  // ensure we're jumping to FV version of the code (not boot remapped alias)\r
  ldr   r2, StartupAddr\r
\r
  // jump to SEC C code\r
  //    r0 = core_id\r
  //    r1 = pei_core_address\r
  blx   r2\r
\r
  END\r