/****************************************************************************
 * arch/arm/src/samv7/sam_mpuinit.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <assert.h>
#include <sys/param.h>

#include <nuttx/userspace.h>
#include <arch/barriers.h>

#include "mpu.h"

#include "hardware/sam_memorymap.h"

#include "sam_mpuinit.h"

#ifdef CONFIG_ARM_MPU

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: sam_mpu_initialize
 *
 * Description:
 *   Configure the MPU to permit user-space access to only restricted SAM3/4
 *   resources.
 *
 ****************************************************************************/

void sam_mpu_initialize(void)
{
#ifdef CONFIG_BUILD_PROTECTED
  uintptr_t datastart;
  uintptr_t dataend;
#endif

  /* Show MPU information */

  mpu_showtype();

#ifdef CONFIG_ARMV7M_DCACHE
  /* Memory barrier */

  UP_DMB();

#ifdef CONFIG_SAMV7_QSPI
  /* Make QSPI memory region strongly ordered */

  mpu_priv_stronglyordered(SAM_QSPIMEM_BASE, SAM_QSPIMEM_SIZE);

#endif
#endif

#ifdef CONFIG_BUILD_PROTECTED
  /* Configure user flash and SRAM space */

  DEBUGASSERT(USERSPACE->us_textend >= USERSPACE->us_textstart);

  mpu_user_flash(USERSPACE->us_textstart,
                 USERSPACE->us_textend - USERSPACE->us_textstart);

  datastart = MIN(USERSPACE->us_datastart, USERSPACE->us_bssstart);
  dataend   = MAX(USERSPACE->us_dataend,   USERSPACE->us_bssend);

  DEBUGASSERT(dataend >= datastart);

  mpu_user_intsram(datastart, dataend - datastart);
#endif

  /* Then enable the MPU */

  mpu_control(true, false, true);
}

/****************************************************************************
 * Name: sam_mpu_uheap
 *
 * Description:
 *  Map the user-heap region.
 *
 *  This logic may need an extension to handle external SDRAM).
 *
 ****************************************************************************/

#ifdef CONFIG_BUILD_PROTECTED
void sam_mpu_uheap(uintptr_t start, size_t size)
{
  mpu_user_intsram(start, size);
}
#endif

#endif /* CONFIG_ARM_MPU */