56471c77b3
Gregory Nutt has submitted the SGA and we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/****************************************************************************
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* arch/arm/src/samv7/sam_mpuinit.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <nuttx/userspace.h>
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#include "mpu.h"
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#include "barriers.h"
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#include "hardware/sam_memorymap.h"
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#include "sam_mpuinit.h"
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#ifdef CONFIG_ARM_MPU
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef MAX
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# define MAX(a,b) a > b ? a : b
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#endif
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#ifndef MIN
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# define MIN(a,b) a < b ? a : b
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sam_mpu_initialize
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*
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* Description:
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* Configure the MPU to permit user-space access to only restricted SAM3/4
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* resources.
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*
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****************************************************************************/
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void sam_mpu_initialize(void)
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{
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#ifdef CONFIG_BUILD_PROTECTED
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uintptr_t datastart;
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uintptr_t dataend;
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#endif
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/* Show MPU information */
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mpu_showtype();
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#ifdef CONFIG_ARMV7M_DCACHE
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/* Memory barrier */
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ARM_DMB();
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#ifdef CONFIG_SAMV7_QSPI
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/* Make QSPI memory region strongly ordered */
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mpu_priv_stronglyordered(SAM_QSPIMEM_BASE, SAM_QSPIMEM_SIZE);
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#endif
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#endif
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#ifdef CONFIG_BUILD_PROTECTED
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/* Configure user flash and SRAM space */
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DEBUGASSERT(USERSPACE->us_textend >= USERSPACE->us_textstart);
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mpu_user_flash(USERSPACE->us_textstart,
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USERSPACE->us_textend - USERSPACE->us_textstart);
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datastart = MIN(USERSPACE->us_datastart, USERSPACE->us_bssstart);
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dataend = MAX(USERSPACE->us_dataend, USERSPACE->us_bssend);
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DEBUGASSERT(dataend >= datastart);
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mpu_user_intsram(datastart, dataend - datastart);
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#endif
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/* Then enable the MPU */
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mpu_control(true, false, true);
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}
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/****************************************************************************
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* Name: sam_mpu_uheap
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*
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* Description:
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* Map the user-heap region.
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*
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* This logic may need an extension to handle external SDRAM).
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*
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****************************************************************************/
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#ifdef CONFIG_BUILD_PROTECTED
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void sam_mpu_uheap(uintptr_t start, size_t size)
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{
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mpu_user_intsram(start, size);
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}
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#endif
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#endif /* CONFIG_ARM_MPU */
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