92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/****************************************************************************
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* arch/arm/src/stm32l5/stm32l5_userspace.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 <stdint.h>
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#include <assert.h>
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#include <nuttx/userspace.h>
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#include "stm32l5_mpuinit.h"
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#include "stm32l5_userspace.h"
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#ifdef CONFIG_BUILD_PROTECTED
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32l5_userspace
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*
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* Description:
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* For the case of the separate user-/kernel-space build, perform whatever
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* platform specific initialization of the user memory is required.
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* Normally this just means initializing the user space .data and .bss
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* segments.
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*
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****************************************************************************/
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void stm32l5_userspace(void)
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{
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uint8_t *src;
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uint8_t *dest;
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uint8_t *end;
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/* Clear all of user-space .bss */
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DEBUGASSERT(USERSPACE->us_bssstart != 0 && USERSPACE->us_bssend != 0 &&
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USERSPACE->us_bssstart <= USERSPACE->us_bssend);
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dest = (uint8_t *)USERSPACE->us_bssstart;
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end = (uint8_t *)USERSPACE->us_bssend;
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while (dest != end)
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{
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*dest++ = 0;
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}
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/* Initialize all of user-space .data */
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DEBUGASSERT(USERSPACE->us_datasource != 0 &&
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USERSPACE->us_datastart != 0 && USERSPACE->us_dataend != 0 &&
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USERSPACE->us_datastart <= USERSPACE->us_dataend);
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src = (uint8_t *)USERSPACE->us_datasource;
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dest = (uint8_t *)USERSPACE->us_datastart;
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end = (uint8_t *)USERSPACE->us_dataend;
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while (dest != end)
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{
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*dest++ = *src++;
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}
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/* Configure the MPU to permit user-space access to its FLASH and RAM */
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stm32l5_mpuinitialize();
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}
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#endif /* CONFIG_BUILD_PROTECTED */
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