/**************************************************************************** * arch/arm/src/kinetis/kinetis_mpuinit.c * * Copyright (C) 2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include "mpu.h" #include "kinetis_mpuinit.h" #if defined(CONFIG_NUTTX_KERNEL) && defined(CONFIG_ARMV7M_MPU) /**************************************************************************** * Private Definitions ****************************************************************************/ #ifndef MAX # define MAX(a,b) a > b ? a : b #endif #ifndef MIN # define MIN(a,b) a < b ? a : b #endif /**************************************************************************** * Private Data ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: kinetis_mpuinitialize * * Description: * Configure the MPU to permit user-space access to only restricted SAM3U * resources. * ****************************************************************************/ void kinetis_mpuinitialize(void) { uintptr_t datastart = MIN(USERSPACE->us_datastart, USERSPACE->us_bssstart); uintptr_t dataend = MAX(USERSPACE->us_dataend, USERSPACE->us_bssend); DEBUGASSERT(USERSPACE->us_textend >= USERSPACE->us_textstart && dataend >= datastart); /* Show MPU information */ mpu_showtype(); /* Configure user flash and SRAM space */ mpu_userflash(USERSPACE->us_textstart, USERSPACE->us_textend - USERSPACE->us_textstart); mpu_userintsram(datastart, dataend - datastart); /* Then enable the MPU */ mpu_control(true, false, true); } /**************************************************************************** * Name: kinetis_mpu_uheap * * Description: * Map the user-heap region. * * This logic may need an extension to handle external SDRAM). * ****************************************************************************/ void kinetis_mpu_uheap(uintptr_t start, size_t size) { mpu_userintsram(start, size); } #endif /* CONFIG_NUTTX_KERNEL && CONFIG_ARMV7M_MPU */