mirror_edk2/ArmPkg/Library/ArmLib/ArmLib.c

/** @file

  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
  Copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>

  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <Base.h>

#include <Library/ArmLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>

#include "ArmLibPrivate.h"

VOID
EFIAPI
ArmSetAuxCrBit (
  IN  UINT32    Bits
  )
{
  UINT32 val = ArmReadAuxCr();
  val |= Bits;
  ArmWriteAuxCr(val);
}

VOID
EFIAPI
ArmUnsetAuxCrBit (
  IN  UINT32    Bits
  )
{
  UINT32 val = ArmReadAuxCr();
  val &= ~Bits;
  ArmWriteAuxCr(val);
}

//
// Helper functions for accessing CPUACTLR
//

VOID
EFIAPI
ArmSetCpuActlrBit (
  IN  UINTN    Bits
  )
{
  UINTN Value;
  Value =  ArmReadCpuActlr ();
  Value |= Bits;
  ArmWriteCpuActlr (Value);
}

VOID
EFIAPI
ArmUnsetCpuActlrBit (
  IN  UINTN    Bits
  )
{
  UINTN Value;
  Value = ArmReadCpuActlr ();
  Value &= ~Bits;
  ArmWriteCpuActlr (Value);
}

UINTN
EFIAPI
ArmDataCacheLineLength (
  VOID
  )
{
  return 4 << ((ArmCacheInfo () >> 16) & 0xf); // CTR_EL0.DminLine
}

UINTN
EFIAPI
ArmInstructionCacheLineLength (
  VOID
  )
{
  return 4 << (ArmCacheInfo () & 0xf); // CTR_EL0.IminLine
}

UINTN
EFIAPI
ArmCacheWritebackGranule (
  VOID
  )
{
  UINTN   CWG;

  CWG = (ArmCacheInfo () >> 24) & 0xf; // CTR_EL0.CWG

  if (CWG == 0) {
    return SIZE_2KB;
  }

  return 4 << CWG;
}