125 lines
4.3 KiB
C
125 lines
4.3 KiB
C
/****************************************************************************
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* arch/arm/src/stm32/stm32_mpuinit.c
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*
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* Copyright (C) 2011, 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 "stm32_mpuinit.h"
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#if defined(CONFIG_BUILD_PROTECTED) && defined(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: stm32_mpuinitialize
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*
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* Description:
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* Configure the MPU to permit user-space access to only restricted SAM3U
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* resources.
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*
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****************************************************************************/
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void stm32_mpuinitialize(void)
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{
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uintptr_t datastart = MIN(USERSPACE->us_datastart, USERSPACE->us_bssstart);
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uintptr_t dataend = MAX(USERSPACE->us_dataend, USERSPACE->us_bssend);
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DEBUGASSERT(USERSPACE->us_textend >= USERSPACE->us_textstart &&
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dataend >= datastart);
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/* Show MPU information */
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mpu_showtype();
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/* Configure user flash and SRAM space */
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mpu_user_flash(USERSPACE->us_textstart,
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USERSPACE->us_textend - USERSPACE->us_textstart);
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mpu_user_intsram(datastart, dataend - datastart);
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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: stm32_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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void stm32_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 /* CONFIG_BUILD_PROTECTED && CONFIG_ARM_MPU */
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