ArmPlatformPkg: Rename gEmbeddedTokenSpaceGuid.PcdEmbeddedFd* into gArmTokenSpaceGuid...

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

//
//  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(PcdNormalFdBaseAddress), 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 PrePeiCore C code
  #    r0 = core_id
  #    r1 = pei_core_address
  blx   r2

.end