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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2013-03-11 17:51:42 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2013-03-11 17:51:42 +0000 |
commit | 3578c60ae17a31fef6486ba5c3a2f97b899fb243 (patch) | |
tree | 69156c78a6928e337491e60e93b707b1bf362c97 /nuttx/arch/arm/src/lpc17xx/lpc17_mpuinit.c | |
parent | 065661cbab0d8ca6f3739c02d0536de3de362402 (diff) | |
download | px4-nuttx-3578c60ae17a31fef6486ba5c3a2f97b899fb243.tar.gz px4-nuttx-3578c60ae17a31fef6486ba5c3a2f97b899fb243.tar.bz2 px4-nuttx-3578c60ae17a31fef6486ba5c3a2f97b899fb243.zip |
Add MPU support for the LPC17xx family
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5731 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/arm/src/lpc17xx/lpc17_mpuinit.c')
-rw-r--r-- | nuttx/arch/arm/src/lpc17xx/lpc17_mpuinit.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/lpc17xx/lpc17_mpuinit.c b/nuttx/arch/arm/src/lpc17xx/lpc17_mpuinit.c new file mode 100644 index 000000000..0a90229e7 --- /dev/null +++ b/nuttx/arch/arm/src/lpc17xx/lpc17_mpuinit.c @@ -0,0 +1,124 @@ +/**************************************************************************** + * arch/arm/src/common/lpc17_mpuinit.c + * + * Copyright (C) 2011, 2013 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 <nuttx/config.h> + +#include <assert.h> + +#include <nuttx/userspace.h> + +#include "mpu.h" +#include "lp17_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: lpc17_mpuinitialize + * + * Description: + * Configure the MPU to permit user-space access to only restricted SAM3U + * resources. + * + ****************************************************************************/ + +void lpc17_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: lpc17_mpu_uheap + * + * Description: + * Map the user-heap region. + * + * This logic may need an extension to handle external SDRAM). + * + ****************************************************************************/ + +void lpc17_mpu_uheap(uintptr_t start, size_t size) +{ + mpu_userintsram(start, size); +} + +#endif /* CONFIG_NUTTX_KERNEL && CONFIG_ARMV7M_MPU */ + |