ArmPlatformPkg/ArmPlatformLib: Added support for ArmPlatformIsPrimaryCore()

[mirror_edk2.git] / ArmPlatformPkg / ArmVExpressPkg / Library / ArmVExpressLibCTA15-A7 / CTA15-A7Helper.asm

//\r
//  Copyright (c) 2012-2013, 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 <Library/ArmLib.h>\r
\r
#include <ArmPlatform.h>\r
\r
  INCLUDE AsmMacroIoLib.inc\r
\r
  EXPORT  ArmPlatformGetCorePosition\r
  EXPORT  ArmPlatformIsPrimaryCore\r
\r
  PRESERVE8\r
  AREA    CTA15A7Helper, CODE, READONLY\r
\r
//UINTN\r
//ArmPlatformGetCorePosition (\r
//  IN UINTN MpId\r
//  );\r
ArmPlatformGetCorePosition FUNCTION\r
  and	r1, r0, #ARM_CORE_MASK\r
  and	r0, r0, #ARM_CLUSTER_MASK\r
  add	r0, r1, r0, LSR #7\r
  bx 	lr\r
  ENDFUNC\r
\r
//UINTN\r
//ArmPlatformIsPrimaryCore (\r
//  IN UINTN MpId\r
//  );\r
ArmPlatformIsPrimaryCore FUNCTION\r
  // Extract cpu_id and cluster_id from ARM_SCC_CFGREG48\r
  // with cpu_id[0:3] and cluster_id[4:7]\r
  LoadConstantToReg (ARM_CTA15A7_SCC_CFGREG48, r1)\r
  ldr   r1, [r1]\r
  lsr   r1, #24\r
\r
  // Shift the SCC value to get the cluster ID at the offset #8\r
  lsl   r2, r1, #4\r
  and   r2, r2, #0xF00\r
\r
  // Keep only the cpu ID from the original SCC\r
  and   r1, r1, #0x0F\r
  // Add the Cluster ID to the Cpu ID\r
  orr   r1, r1, r2\r
\r
  // Keep the Cluster ID and Core ID from the MPID\r
  LoadConstantToReg (ARM_CLUSTER_MASK | ARM_CORE_MASK, r2)\r
  and   r0, r0, r2\r
\r
  // Compare mpid and boot cpu from ARM_SCC_CFGREG48\r
  cmp   r0, r1\r
  moveq r0, #1\r
  movne r0, #0\r
  bx    lr\r
  ENDFUNC\r
\r
  END\r