ArmPlatformPkg: Introduce Primary core macros

[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
  IMPORT  ArmReadMpidr\r
  EXPORT  _ModuleEntryPoint\r
  \r
  PRESERVE8\r
  AREA    PrePeiCoreEntryPoint, CODE, READONLY\r
  \r
StartupAddr        DCD      CEntryPoint\r
\r
_ModuleEntryPoint\r
  // Identify CPU ID\r
  bl    ArmReadMpidr\r
  // Get ID of this CPU in Multicore system\r
  LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)\r
  and   r0, r0, r1\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
  // Only allocate memory in top of the primary core stack\r
  cmp   r0, #0\r
  bne   _PrepareArguments\r
\r
_AllocateGlobalPeiVariables\r
  // Reserve top of the stack for Global PEI Variables (eg: PeiServicesTablePointer)\r
  LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r1)\r
  sub   sp, sp, r1\r
\r
_PrepareArguments\r
  // The PEI Core Entry Point has been computed by GenFV and stored in the second entry of the Reset Vector\r
  LoadConstantToReg (FixedPcdGet32(PcdNormalFvBaseAddress), 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 PrePeiCore C code\r
  //    r0 = mp_id\r
  //    r1 = pei_core_address\r
  blx   r2\r
\r
  END\r