historical/m0-applesillicon.git/xnu-qemu-arm64-5.1.0/roms/edk2/ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.c

/** @file

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

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

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

STATIC
VOID
CacheRangeOperation (
  IN  VOID            *Start,
  IN  UINTN           Length,
  IN  LINE_OPERATION  LineOperation,
  IN  UINTN           LineLength
  )
{
  UINTN ArmCacheLineAlignmentMask  = LineLength - 1;

  // Align address (rounding down)
  UINTN AlignedAddress = (UINTN)Start - ((UINTN)Start & ArmCacheLineAlignmentMask);
  UINTN EndAddress     = (UINTN)Start + Length;

  // Perform the line operation on an address in each cache line
  while (AlignedAddress < EndAddress) {
    LineOperation(AlignedAddress);
    AlignedAddress += LineLength;
  }
  ArmDataSynchronizationBarrier ();
}

VOID
EFIAPI
InvalidateInstructionCache (
  VOID
  )
{
  ASSERT (FALSE);
}

VOID
EFIAPI
InvalidateDataCache (
  VOID
  )
{
  ASSERT (FALSE);
}

VOID *
EFIAPI
InvalidateInstructionCacheRange (
  IN      VOID                      *Address,
  IN      UINTN                     Length
  )
{
  CacheRangeOperation (Address, Length, ArmCleanDataCacheEntryToPoUByMVA,
    ArmDataCacheLineLength ());
  CacheRangeOperation (Address, Length,
    ArmInvalidateInstructionCacheEntryToPoUByMVA,
    ArmInstructionCacheLineLength ());

  ArmInstructionSynchronizationBarrier ();

  return Address;
}

VOID
EFIAPI
WriteBackInvalidateDataCache (
  VOID
  )
{
  ASSERT (FALSE);
}

VOID *
EFIAPI
WriteBackInvalidateDataCacheRange (
  IN      VOID                      *Address,
  IN      UINTN                     Length
  )
{
  CacheRangeOperation(Address, Length, ArmCleanInvalidateDataCacheEntryByMVA,
    ArmDataCacheLineLength ());
  return Address;
}

VOID
EFIAPI
WriteBackDataCache (
  VOID
  )
{
  ASSERT (FALSE);
}

VOID *
EFIAPI
WriteBackDataCacheRange (
  IN      VOID                      *Address,
  IN      UINTN                     Length
  )
{
  CacheRangeOperation(Address, Length, ArmCleanDataCacheEntryByMVA,
    ArmDataCacheLineLength ());
  return Address;
}

VOID *
EFIAPI
InvalidateDataCacheRange (
  IN      VOID                      *Address,
  IN      UINTN                     Length
  )
{
  CacheRangeOperation(Address, Length, ArmInvalidateDataCacheEntryByMVA,
    ArmDataCacheLineLength ());
  return Address;
}