108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
/****************************************************************************
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* arch/arm/src/stm32l4/stm32l4_firewall.c
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*
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* Copyright (C) 2016 Sebastien Lorquet. All rights reserved.
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* Author: Sebastien Lorquet <sebastien@lorquet.fr>
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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 "stm32l4_firewall.h"
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int stm32l4_firewallsetup(FAR struct stm32l4_firewall_t *setup)
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{
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uint32_t reg;
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/* code and nvdata must be aligned to 256 bytes
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* data must be aligned to 64 bytes
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*/
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if( (setup->codestart & 0xFF) || (setup->nvdatastart & 0xFF) || (setup->datastart & 0x3F) )
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{
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return -1;
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}
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/* code and nvdata length must be a multiple of 256 bytes
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* data length must be a multiple of 64 bytes
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*/
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if( (setup->codelen & 0xFF) || (setup->nvdatalen & 0xFF) || (setup->datalen & 0x3F) )
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{
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return -1;
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}
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/*
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* code and nvdata must be in flash
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* data must be in SRAM1
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*/
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if( (setup->codestart & STM32L4_REGION_MASK) != STM32L4_FLASH_BASE)
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{
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return -1;
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}
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if( (setup->nvdatastart & STM32L4_REGION_MASK) != STM32L4_FLASH_BASE)
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{
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return -1;
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}
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/* Define address and length registers */
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modifyreg32(STM32L4_FIREWALL_CSSA , FIREWALL_CSSADD_MASK , setup->codestart );
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modifyreg32(STM32L4_FIREWALL_CSL , FIREWALL_CSSLENG_MASK , setup->codelen );
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modifyreg32(STM32L4_FIREWALL_NVDSSA, FIREWALL_NVDSADD_MASK , setup->nvdatastart);
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modifyreg32(STM32L4_FIREWALL_NVDSL , FIREWALL_NVDSLENG_MASK, setup->nvdatalen );
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modifyreg32(STM32L4_FIREWALL_VDSSA , FIREWALL_VDSADD_MASK , setup->datastart );
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modifyreg32(STM32L4_FIREWALL_VDSL , FIREWALL_VDSLENG_MASK , setup->datalen );
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/* Define access options */
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reg = getreg32(STM32L4_FIREWALL_CR);
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if(setup->datashared)
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{
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reg |= FIREWALL_CR_VDS;
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}
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if(setup->dataexec)
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{
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reg |= FIREWALL_CR_VDE;
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}
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putreg32(reg, STM32L4_FIREWALL_CR);
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/* Enable firewall */
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reg = getreg32(STM32L4_SYSCFG_CFGR1);
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reg &= ~SYSCFG_CFGR1_FWDIS;
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putreg32(reg, STM32L4_SYSCFG_CFGR1);
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/* Now protected code can only be accessed by jumping to the FW gate */
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return 0;
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}
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