ArmPlatformPkg/ArmJunoPkg/Library/ArmJunoLib/AArch64/ArmJunoHelper.S

   1 /** @file
   2 *
   3 *  Copyright (c) 2013-2014, ARM Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this distribution.  The full text of the license may be found at
   8 *  http://opensource.org/licenses/bsd-license.php
   9 *
  10 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 *
  13 **/
  14
  15 #include <AsmMacroIoLibV8.h>
  16 #include <Library/ArmLib.h>
  17
  18 .text
  19 .align 3
  20
  21 GCC_ASM_EXPORT(ArmPlatformPeiBootAction)
  22 GCC_ASM_EXPORT(ArmPlatformGetCorePosition)
  23 GCC_ASM_EXPORT(ArmPlatformGetPrimaryCoreMpId)
  24 GCC_ASM_EXPORT(ArmPlatformIsPrimaryCore)
  25
  26 GCC_ASM_IMPORT(_gPcd_FixedAtBuild_PcdArmPrimaryCoreMask)
  27
  28
  29 PrimaryCoreMpid:  .word    0x0
  30
  31 //UINTN
  32 //ArmPlatformGetCorePosition (
  33 //  IN UINTN MpId
  34 //  );
  35 // With this function: CorePos = (ClusterId * 2) + CoreId
  36 ASM_PFX(ArmPlatformGetCorePosition):
  37   and   x1, x0, #ARM_CORE_MASK
  38   and   x0, x0, #ARM_CLUSTER_MASK
  39   add   x0, x1, x0, LSR #7
  40   ret
  41
  42 //UINTN
  43 //ArmPlatformGetPrimaryCoreMpId (
  44 //  VOID
  45 //  );
  46 ASM_PFX(ArmPlatformGetPrimaryCoreMpId):
  47   ldr   x0, =PrimaryCoreMpid
  48   ldrh  w0, [x0]
  49   ret
  50
  51 //UINTN
  52 //ArmPlatformIsPrimaryCore (
  53 //  IN UINTN MpId
  54 //  );
  55 ASM_PFX(ArmPlatformIsPrimaryCore):
  56   LoadConstantToReg (_gPcd_FixedAtBuild_PcdArmPrimaryCoreMask, x1)
  57   ldrh  w1, [x1]
  58   and   x0, x0, x1
  59
  60   ldr   x1, =PrimaryCoreMpid
  61   ldrh  w1, [x1]
  62
  63   cmp   w0, w1
  64   mov   x0, #1
  65   mov   x1, #0
  66   csel  x0, x0, x1, eq
  67   ret
  68
  69 ASM_PFX(ArmPlatformPeiBootAction):
  70   // The trusted firmware passes the primary CPU MPID through x0 register.
  71   // Save it in a variable.
  72   ldr  x1, =PrimaryCoreMpid
  73   str  w0, [x1]
  74   ret
  75