Use same scheme as *.asm file.

[mirror_edk2.git] / ArmRealViewEbPkg / SecForPei / Arm / ModuleEntryPoint.S

#------------------------------------------------------------------------------ \r
#\r
# ARM EB Entry point. Reset vector in FV header will brach to\r
# _ModuleEntryPoint. \r
#\r
# We use crazy macros, like LoadConstantToReg, since Xcode assembler \r
# does not support = assembly syntax for ldr.\r
#\r
# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\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 <ArmEb/ArmEb.h>\r
\r
.text\r
.align 3\r
\r
.globl ASM_PFX(CEntryPoint)\r
.globl ASM_PFX(_ModuleEntryPoint)\r
.globl ASM_PFX(StartupAddr)\r
\r
\r
ASM_PFX(StartupAddr):   .word ASM_PFX(CEntryPoint)\r
\r
ASM_PFX(_ModuleEntryPoint):\r
 \r
  // Turn off remapping NOR to 0. We can now use DRAM in low memory\r
  // CAN'T DO THIS HERE -- BRANCH FROM RESET VECTOR IS RELATIVE AND REMAINS IN REMAPPED NOR\r
  //MmioOr32 (0x10001000 ,BIT8) //EB_SP810_CTRL_BASE\r
\r
  // Enable NEON register in case folks want to use them for optimizations (CopyMem)\r
  mrc     p15, 0, r0, c1, c0, 2\r
  orr     r0, r0, #0x00f00000   // Enable VFP access (V* instructions)\r
  mcr     p15, 0, r0, c1, c0, 2\r
  mov     r0, #0x40000000       // Set EN bit in FPEXC\r
  mcr     p10,#0x7,r0,c8,c0,#0  // msr     FPEXC,r0 in ARM assembly\r
   \r
  // Set CPU vectors to 0 (which is currently flash)\r
  LoadConstantToReg (FixedPcdGet32(PcdCpuVectorBaseAddress) ,r0) // Get vector base\r
  mcr     p15, 0, r0, c12, c0, 0\r
  isb                               // Sync changes to control registers\r
\r
  //\r
  // Set stack based on PCD values. Need to do it this way to make C code work \r
  // when it runs from FLASH. \r
  //  \r
  LoadConstantToReg (FixedPcdGet32(PcdPrePiStackBase) ,r0)    // temp ram base  arg 0 TODO: change "stackbase" to "temprambase"\r
  LoadConstantToReg (FixedPcdGet32(PcdPrePiStackSize) ,r1)    // temp ram size  arg 1\r
  lsr     r3, r1, #1   // r4 = size of temp mem / 2\r
  add     r3, r3, r0  // r2 = temp ram base + r4\r
  mov     r13, r3     // result: stack pointer = temp ram base + (size of temp mem / 2)\r
    \r
  // lr points to area in reset vector block containing PEI core address\r
  ldr     r2, [lr]  // pei core   arg 3\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   r4, ASM_PFX(StartupAddr) // Extra level of indirection fixes Xcode relocation issue\r
\r
  // jump to SEC C code\r
  blx   r4\r
  \r
\r
ASM_PFX(ShouldNeverGetHere):\r
  // _CEntryPoint should never return \r
  b       ASM_PFX(ShouldNeverGetHere)\r
\r
 \r