ArmPlatformPkg/ArmPlatformLib: Added support for ArmPlatformIsPrimaryCore()

[mirror_edk2.git] / ArmPlatformPkg / ArmVExpressPkg / Library / ArmVExpressLibRTSM / Arm / RTSMHelper.asm

//\r
//  Copyright (c) 2011-2012, ARM Limited. All rights reserved.\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
\r
#include <Chipset/ArmCortexA9.h>\r
\r
#include <AutoGen.h>\r
\r
  INCLUDE AsmMacroIoLib.inc\r
\r
  EXPORT    ArmGetCpuCountPerCluster\r
  EXPORT    ArmPlatformIsPrimaryCore\r
\r
  IMPORT  _gPcd_FixedAtBuild_PcdArmPrimaryCore\r
  IMPORT  _gPcd_FixedAtBuild_PcdArmPrimaryCoreMask\r
\r
  AREA RTSMHelper, CODE, READONLY\r
\r
// IN None\r
// OUT r0 = SCU Base Address\r
ArmGetScuBaseAddress FUNCTION\r
  // Read Configuration Base Address Register. ArmCBar cannot be called to get\r
  // the Configuration BAR as a stack is not necessary setup. The SCU is at the\r
  // offset 0x0000 from the Private Memory Region.\r
  mrc   p15, 4, r0, c15, c0, 0\r
  bx  lr\r
  ENDFUNC\r
\r
// IN None\r
// OUT r0 = number of cores present in the system\r
ArmGetCpuCountPerCluster FUNCTION\r
  stmfd SP!, {r1-r2}\r
\r
  // Read CP15 MIDR\r
  mrc   p15, 0, r1, c0, c0, 0\r
\r
  // Check if the CPU is A15\r
  mov   r1, r1, LSR #4\r
  mov   r0, #ARM_CPU_TYPE_MASK\r
  and   r1, r1, r0\r
\r
  mov   r0, #ARM_CPU_TYPE_A15\r
  cmp   r1, r0\r
  beq   _Read_cp15_reg\r
\r
_CPU_is_not_A15\r
  mov   r2, lr                              ; Save link register\r
  bl    ArmGetScuBaseAddress                ; Read SCU Base Address\r
  mov   lr, r2                              ; Restore link register val\r
  ldr   r0, [r0, #A9_SCU_CONFIG_OFFSET]     ; Read SCU Config reg to get CPU count\r
  b     _Return\r
\r
_Read_cp15_reg\r
  mrc   p15, 1, r0, c9, c0, 2            ; Read C9 register of CP15 to get CPU count\r
  lsr   r0, #24\r
\r
\r
_Return\r
  and   r0, r0, #3\r
  // Add '1' to the number of CPU on the Cluster\r
  add   r0, r0, #1\r
  ldmfd SP!, {r1-r2}\r
  bx lr\r
  ENDFUNC\r
\r
//UINTN\r
//ArmPlatformIsPrimaryCore (\r
//  IN UINTN MpId\r
//  );\r
ArmPlatformIsPrimaryCore FUNCTION\r
  LoadConstantToReg (_gPcd_FixedAtBuild_PcdArmPrimaryCoreMask, r1)\r
  ldr   r1, [r1]\r
  and   r0, r0, r1\r
  LoadConstantToReg (_gPcd_FixedAtBuild_PcdArmPrimaryCore, r1)\r
  ldr   r1, [r1]\r
  cmp   r0, r1\r
  moveq r0, #1\r
  movne r0, #0\r
  bx 	lr\r
  ENDFUNC\r
\r
  END\r