Fixup to point to real RAM and NOR addressess.

[mirror_edk2.git] / ArmEbPkg / Sec / 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
\r
ASM_PFX(_ModuleEntryPoint):\r
 \r
  // Turn off remapping NOR to 0. We can now use DRAM in low memory\r
  MmioOr32 (EB_SP810_CTRL_BASE ,BIT8) \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 VPF access (V* instructions)\r
  mcr     p15, 0, r0, c1, c0, 2\r
  mov     r0, #0x40000000       // Set EN bit in FPEXC\r
  msr     FPEXC,r0\r
  \r
   \r
  // Set CPU vectors to start of DRAM\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
  // Fill vector table with branchs to current pc (jmp $)\r
  // CPU DXE driver likes known values so it can let GDB stub hook vectors\r
  ldr     r1, ShouldNeverGetHere\r
  movs    r2, #0\r
FillVectors\r
  str     r1, [r0, r2]\r
  adds    r2, r2, #4\r
  cmp     r2, #32\r
  bne     FillVectors\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) ,r2)    // stack base arg2  \r
  LoadConstantToReg (FixedPcdGet32(PcdPrePiStackSize) ,r3)    // stack size arg3  \r
  add     r4, r2, r3\r
  mov     r13, r4\r
\r
  // Call C entry point\r
  LoadConstantToReg (FixedPcdGet32(PcdMemorySize) ,r1)    // memory size arg1      \r
  LoadConstantToReg (FixedPcdGet32(PcdMemoryBase) ,r0)    // memory size arg0       \r
  blx      ASM_PFX(CEntryPoint) \r
\r
ShouldNeverGetHere:\r
  // _CEntryPoint should never return \r
  b       ShouldNeverGetHere\r
\r
 \r