ArmPlatformPkg/ArmRealViewEbPkg/Library/ArmRealViewEbSecLibRTSM/ArmRealViewEbBoot.asm

   1 //
   2 //  Copyright (c) 2011-2012, ARM Limited. All rights reserved.
   3 //
   4 //  This program and the accompanying materials
   5 //  are licensed and made available under the terms and conditions of the BSD License
   6 //  which accompanies this distribution.  The full text of the license may be found at
   7 //  http://opensource.org/licenses/bsd-license.php
   8 //
   9 //  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 //  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 //
  12 //
  13
  14 #include <AsmMacroIoLib.h>
  15 #include <Base.h>
  16 #include <Library/ArmPlatformSecLib.h>
  17 #include <ArmPlatform.h>
  18 #include <AutoGen.h>
  19
  20   INCLUDE AsmMacroIoLib.inc
  21
  22   EXPORT  ArmPlatformSecBootAction
  23   EXPORT  ArmPlatformSecBootMemoryInit
  24
  25   PRESERVE8
  26   AREA    ArmRealviewEbBootMode, CODE, READONLY
  27
  28 /**
  29   Call at the beginning of the platform boot up
  30
  31   This function allows the firmware platform to do extra actions at the early
  32   stage of the platform power up.
  33
  34   Note: This function must be implemented in assembler as there is no stack set up yet
  35
  36 **/
  37 ArmPlatformSecBootAction
  38   LoadConstantToReg (ARM_EB_SYS_FLAGS_NV_REG, r0)
  39   ldr   r0, [r0]
  40   cmp   r0, #0
  41   bxeq  lr
  42   bxne  r0
  43
  44 /**
  45   Initialize the memory where the initial stacks will reside
  46
  47   This memory can contain the initial stacks (Secure and Secure Monitor stacks).
  48   In some platform, this region is already initialized and the implementation of this function can
  49   do nothing. This memory can also represent the Secure RAM.
  50   This function is called before the satck has been set up. Its implementation must ensure the stack
  51   pointer is not used (probably required to use assembly language)
  52
  53 **/
  54 ArmPlatformSecBootMemoryInit
  55   // The SMC does not need to be initialized for RTSM
  56   bx    lr
  57
  58   END