ArmPkg/Drivers/ArmCpuLib/Arm11MpCoreLib/Arm11Helper.S

   1 //
   2 //  Copyright (c) 2011, 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 <Library/ArmCpuLib.h>
  15
  16 .text
  17 .align 3
  18
  19 GCC_ASM_EXPORT(ArmCpuSynchronizeWait)
  20 GCC_ASM_IMPORT(CArmCpuSynchronizeWait)
  21
  22 // VOID
  23 // ArmCpuSynchronizeWait (
  24 //   IN ARM_CPU_SYNCHRONIZE_EVENT   Event
  25 //   );
  26 ASM_PFX(ArmCpuSynchronizeWait):
  27   cmp   r0, #ARM_CPU_EVENT_BOOT_MEM_INIT
  28   // The SCU enabled is the event to tell us the Init Boot Memory is initialized
  29   bx    lr
  30   b     ASM_PFX(CArmCpuSynchronizeWait)
  31
  32
  33 #if 0
  34 GCC_ASM_EXPORT(ArmCpuSynchronizeWait)
  35 GCC_ASM_EXPORT(ArmGetScuBaseAddress)
  36 GCC_ASM_IMPORT(CArmCpuSynchronizeWait)
  37
  38 // VOID
  39 // ArmCpuSynchronizeWait (
  40 //   IN ARM_CPU_SYNCHRONIZE_EVENT   Event
  41 //   );
  42 ASM_PFX(ArmCpuSynchronizeWait):
  43   cmp   r0, #ARM_CPU_EVENT_BOOT_MEM_INIT
  44   // The SCU enabled is the event to tell us the Init Boot Memory is initialized
  45   beq   ArmWaitScuEnabled
  46   b     ASM_PFX(CArmCpuSynchronizeWait)
  47
  48 // IN None
  49 // OUT r0 = SCU Base Address
  50 ASM_PFX(ArmGetScuBaseAddress):
  51   // Read Configuration Base Address Register. ArmCBar cannot be called to get
  52   // the Configuration BAR as a stack is not necessary setup. The SCU is at the
  53   // offset 0x0000 from the Private Memory Region.
  54   mrc   p15, 4, r0, c15, c0, 0
  55   bx  lr
  56
  57 ASM_PFX(ArmWaitScuEnabled):
  58   // Read Configuration Base Address Register. ArmCBar cannot be called to get
  59   // the Configuration BAR as a stack is not necessary setup. The SCU is at the
  60   // offset 0x0000 from the Private Memory Region.
  61   mrc   p15, 4, r0, c15, c0, 0
  62   add   r0, r0, #A9_SCU_CONTROL_OFFSET
  63   ldr   r0, [r0]
  64   cmp   r0, #1
  65   bne   ArmWaitScuEnabled
  66   bx    lr
  67 #endif