ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressSecLibRTSM/RTSMHelper.S

   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/PcdLib.h>
  17 #include <AutoGen.h>
  18 #.include AsmMacroIoLib.inc
  19
  20 #include <Chipset/ArmCortexA9.h>
  21
  22 .text
  23 .align 2
  24
  25 GCC_ASM_EXPORT(ArmGetCpuCountPerCluster)
  26
  27 # IN None
  28 # OUT r0 = SCU Base Address
  29 ASM_PFX(ArmGetScuBaseAddress):
  30   # Read Configuration Base Address Register. ArmCBar cannot be called to get
  31   # the Configuration BAR as a stack is not necessary setup. The SCU is at the
  32   # offset 0x0000 from the Private Memory Region.
  33   mrc   p15, 4, r0, c15, c0, 0
  34   bx  lr
  35
  36 # IN None
  37 # OUT r0 = number of cores present in the system
  38 ASM_PFX(ArmGetCpuCountPerCluster):
  39   stmfd SP!, {r1-r2}
  40
  41   # Read CP15 MIDR
  42   mrc   p15, 0, r1, c0, c0, 0
  43
  44   # Check if the CPU is A15
  45   mov   r1, r1, LSR #4
  46   LoadConstantToReg (ARM_CPU_TYPE_MASK, r0)
  47   and   r1, r1, r0
  48
  49   LoadConstantToReg (ARM_CPU_TYPE_A15, r0)
  50   cmp   r1, r0
  51   beq   _Read_cp15_reg
  52
  53 _CPU_is_not_A15:
  54   mov   r2, lr                           @ Save link register
  55   bl    ArmGetScuBaseAddress             @ Read SCU Base Address
  56   mov   lr, r2                           @ Restore link register val
  57   ldr   r0, [r0, #A9_SCU_CONFIG_OFFSET]     @ Read SCU Config reg to get CPU count
  58   b     _Return
  59
  60 _Read_cp15_reg:
  61   mrc   p15, 1, r0, c9, c0, 2            @ Read C9 register of CP15 to get CPU count
  62   lsr   r0, #24
  63
  64 _Return:
  65   and   r0, r0, #3
  66   # Add '1' to the number of CPU on the Cluster
  67   add   r0, r0, #1
  68   ldmfd SP!, {r1-r2}
  69   bx lr
  70
  71 ASM_FUNCTION_REMOVE_IF_UNREFERENCED