2009-09-25 16:17:18 +02:00
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/****************************************************************************
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* arch/arm/src/stm32/stm32_start.c
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*
|
2016-04-02 14:58:55 +02:00
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* Copyright (C) 2009, 2011-2016 Gregory Nutt. All rights reserved.
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2011-12-07 19:58:21 +01:00
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* Author: Gregory Nutt <gnutt@nuttx.org>
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2009-09-25 16:17:18 +02:00
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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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2013-02-18 00:53:44 +01:00
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/****************************************************************************
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* Included Files
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****************************************************************************/
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2009-09-25 16:17:18 +02:00
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#include <nuttx/config.h>
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2009-12-16 21:05:51 +01:00
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#include <stdint.h>
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2009-09-25 16:17:18 +02:00
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/init.h>
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2009-12-29 01:48:56 +01:00
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#include <arch/board/board.h>
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2009-09-25 16:17:18 +02:00
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#include "up_arch.h"
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#include "up_internal.h"
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2009-12-29 01:48:56 +01:00
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2013-02-09 16:03:49 +01:00
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#include "stm32.h"
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2011-03-12 18:49:47 +01:00
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#include "stm32_gpio.h"
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2013-03-22 15:49:21 +01:00
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#include "stm32_userspace.h"
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2011-03-12 18:49:47 +01:00
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2011-11-24 02:34:10 +01:00
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#ifdef CONFIG_ARCH_FPU
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# include "nvic.h"
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#endif
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2009-09-25 16:17:18 +02:00
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2013-11-01 18:16:51 +01:00
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/****************************************************************************
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* Private Function prototypes
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****************************************************************************/
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#ifdef CONFIG_ARCH_FPU
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static inline void stm32_fpuconfig(void);
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#endif
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2015-01-24 13:49:51 +01:00
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#ifdef CONFIG_STACK_COLORATION
|
2013-11-01 18:16:51 +01:00
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static void go_os_start(void *pv, unsigned int nbytes)
|
2015-10-07 21:45:15 +02:00
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__attribute__ ((naked, no_instrument_function, noreturn));
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2013-11-01 18:16:51 +01:00
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#endif
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2013-02-18 00:53:44 +01:00
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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2009-09-25 16:17:18 +02:00
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/****************************************************************************
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* Name: showprogress
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*
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* Description:
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* Print a character on the UART to show boot status.
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*
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****************************************************************************/
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2016-06-11 22:14:08 +02:00
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#ifdef CONFIG_DEBUG_FEATURES
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2009-09-25 16:17:18 +02:00
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# define showprogress(c) up_lowputc(c)
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#else
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# define showprogress(c)
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#endif
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2014-12-26 15:30:42 +01:00
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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2015-04-12 14:26:50 +02:00
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#ifdef CONFIG_ARMV7M_STACKCHECK
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/* we need to get r10 set before we can allow instrumentation calls */
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void __start(void) __attribute__ ((no_instrument_function));
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#endif
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|
2012-02-22 19:14:18 +01:00
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/****************************************************************************
|
2011-11-24 02:34:10 +01:00
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* Name: stm32_fpuconfig
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*
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* Description:
|
2012-02-27 18:22:10 +01:00
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* Configure the FPU. Relative bit settings:
|
2012-02-22 19:14:18 +01:00
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*
|
2012-02-27 18:22:10 +01:00
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* CPACR: Enables access to CP10 and CP11
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* CONTROL.FPCA: Determines whether the FP extension is active in the
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* current context:
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* FPCCR.ASPEN: Enables automatic FP state preservation, then the
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* processor sets this bit to 1 on successful completion of any FP
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* instruction.
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* FPCCR.LSPEN: Enables lazy context save of FP state. When this is
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* done, the processor reserves space on the stack for the FP state,
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* but does not save that state information to the stack.
|
2012-02-22 19:14:18 +01:00
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*
|
2012-02-27 18:22:10 +01:00
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* Software must not change the value of the ASPEN bit or LSPEN bit while either:
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* - the CPACR permits access to CP10 and CP11, that give access to the FP
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* extension, or
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* - the CONTROL.FPCA bit is set to 1
|
2011-11-24 02:34:10 +01:00
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*
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****************************************************************************/
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#ifdef CONFIG_ARCH_FPU
|
2015-03-06 15:26:43 +01:00
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#if defined(CONFIG_ARMV7M_CMNVECTOR) && !defined(CONFIG_ARMV7M_LAZYFPU)
|
2012-02-22 19:14:18 +01:00
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2012-02-27 18:22:10 +01:00
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static inline void stm32_fpuconfig(void)
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|
|
{
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uint32_t regval;
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/* Set CONTROL.FPCA so that we always get the extended context frame
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* with the volatile FP registers stacked above the basic context.
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*/
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|
2013-11-01 18:16:51 +01:00
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regval = getcontrol();
|
2012-02-27 18:22:10 +01:00
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|
regval |= (1 << 2);
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setcontrol(regval);
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/* Ensure that FPCCR.LSPEN is disabled, so that we don't have to contend
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* with the lazy FP context save behaviour. Clear FPCCR.ASPEN since we
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* are going to turn on CONTROL.FPCA for all contexts.
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*/
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regval = getreg32(NVIC_FPCCR);
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regval &= ~((1 << 31) | (1 << 30));
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putreg32(regval, NVIC_FPCCR);
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/* Enable full access to CP10 and CP11 */
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regval = getreg32(NVIC_CPACR);
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regval |= ((3 << (2*10)) | (3 << (2*11)));
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putreg32(regval, NVIC_CPACR);
|
2012-02-22 19:14:18 +01:00
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}
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#else
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|
2012-02-27 18:22:10 +01:00
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static inline void stm32_fpuconfig(void)
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|
{
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|
uint32_t regval;
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/* Clear CONTROL.FPCA so that we do not get the extended context frame
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* with the volatile FP registers stacked in the saved context.
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*/
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|
2013-11-01 18:16:51 +01:00
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|
regval = getcontrol();
|
2012-02-27 18:22:10 +01:00
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|
regval &= ~(1 << 2);
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setcontrol(regval);
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/* Ensure that FPCCR.LSPEN is disabled, so that we don't have to contend
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* with the lazy FP context save behaviour. Clear FPCCR.ASPEN since we
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|
* are going to keep CONTROL.FPCA off for all contexts.
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|
*/
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|
regval = getreg32(NVIC_FPCCR);
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|
regval &= ~((1 << 31) | (1 << 30));
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|
|
putreg32(regval, NVIC_FPCCR);
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|
/* Enable full access to CP10 and CP11 */
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|
|
|
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|
regval = getreg32(NVIC_CPACR);
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|
|
regval |= ((3 << (2*10)) | (3 << (2*11)));
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|
|
putreg32(regval, NVIC_CPACR);
|
2011-11-24 02:34:10 +01:00
|
|
|
}
|
2012-02-27 18:22:10 +01:00
|
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|
2012-02-22 19:14:18 +01:00
|
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|
#endif
|
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|
2011-11-24 02:34:10 +01:00
|
|
|
#else
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|
|
# define stm32_fpuconfig()
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|
#endif
|
|
|
|
|
2013-11-01 18:16:51 +01:00
|
|
|
/****************************************************************************
|
|
|
|
* Name: go_os_start
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Set the IDLE stack to the
|
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|
|
*
|
|
|
|
****************************************************************************/
|
2015-01-24 13:49:51 +01:00
|
|
|
|
|
|
|
#ifdef CONFIG_STACK_COLORATION
|
2013-11-01 18:16:51 +01:00
|
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|
static void go_os_start(void *pv, unsigned int nbytes)
|
|
|
|
{
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|
|
|
/* Set the IDLE stack to the stack coloration value then jump to
|
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|
|
* os_start(). We take extreme care here because were currently
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|
|
* executing on this stack.
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|
*
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|
* We want to avoid sneak stack access generated by the compiler.
|
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|
|
*/
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|
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|
|
__asm__ __volatile__
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|
|
|
(
|
2015-05-08 04:36:08 +02:00
|
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|
"\tmovs r1, r1, lsr #2\n" /* R1 = nwords = nbytes >> 2 */
|
2013-11-01 18:16:51 +01:00
|
|
|
"\tbeq 2f\n" /* (should not happen) */
|
|
|
|
|
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|
|
"\tbic r0, r0, #3\n" /* R0 = Aligned stackptr */
|
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|
|
"\tmovw r2, #0xbeef\n" /* R2 = STACK_COLOR = 0xdeadbeef */
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|
|
"\tmovt r2, #0xdead\n"
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|
|
|
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|
|
"1:\n" /* Top of the loop */
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|
|
"\tsub r1, r1, #1\n" /* R1 nwords-- */
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|
|
"\tcmp r1, #0\n" /* Check (nwords == 0) */
|
|
|
|
"\tstr r2, [r0], #4\n" /* Save stack color word, increment stackptr */
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|
|
|
"\tbne 1b\n" /* Bottom of the loop */
|
|
|
|
|
2013-11-01 22:30:18 +01:00
|
|
|
"2:\n"
|
2013-11-01 18:16:51 +01:00
|
|
|
"\tmov r14, #0\n" /* LR = return address (none) */
|
|
|
|
"\tb os_start\n" /* Branch to os_start */
|
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|
|
);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2009-09-25 16:17:18 +02:00
|
|
|
/****************************************************************************
|
|
|
|
* Public Functions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: _start
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* This is the reset entry point.
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
void __start(void)
|
|
|
|
{
|
2009-12-16 21:05:51 +01:00
|
|
|
const uint32_t *src;
|
|
|
|
uint32_t *dest;
|
2009-09-25 16:17:18 +02:00
|
|
|
|
2015-04-12 14:26:50 +02:00
|
|
|
#ifdef CONFIG_ARMV7M_STACKCHECK
|
|
|
|
/* Set the stack limit before we attempt to call any functions */
|
|
|
|
|
|
|
|
__asm__ volatile ("sub r10, sp, %0" : : "r" (CONFIG_IDLETHREAD_STACKSIZE - 64) : );
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|
|
|
#endif
|
|
|
|
|
2014-12-26 15:30:42 +01:00
|
|
|
/* Configure the UART so that we can get debug output as soon as possible */
|
2009-09-25 16:17:18 +02:00
|
|
|
|
2009-09-29 01:33:51 +02:00
|
|
|
stm32_clockconfig();
|
2011-11-24 02:34:10 +01:00
|
|
|
stm32_fpuconfig();
|
2009-09-29 01:33:51 +02:00
|
|
|
stm32_lowsetup();
|
2011-05-16 17:09:39 +02:00
|
|
|
stm32_gpioinit();
|
2009-09-25 16:17:18 +02:00
|
|
|
showprogress('A');
|
|
|
|
|
|
|
|
/* Clear .bss. We'll do this inline (vs. calling memset) just to be
|
|
|
|
* certain that there are no issues with the state of global variables.
|
|
|
|
*/
|
|
|
|
|
2016-04-02 15:53:52 +02:00
|
|
|
for (dest = _START_BSS; dest < _END_BSS; )
|
2009-09-25 16:17:18 +02:00
|
|
|
{
|
|
|
|
*dest++ = 0;
|
|
|
|
}
|
2013-03-22 15:49:21 +01:00
|
|
|
|
2009-09-25 16:17:18 +02:00
|
|
|
showprogress('B');
|
|
|
|
|
2013-12-05 17:37:55 +01:00
|
|
|
/* Move the initialized data section from his temporary holding spot in
|
2009-09-25 16:17:18 +02:00
|
|
|
* FLASH into the correct place in SRAM. The correct place in SRAM is
|
|
|
|
* give by _sdata and _edata. The temporary location is in FLASH at the
|
|
|
|
* end of all of the other read-only data (.text, .rodata) at _eronly.
|
|
|
|
*/
|
|
|
|
|
2016-04-02 14:58:55 +02:00
|
|
|
for (src = _DATA_INIT, dest = _START_DATA; dest < _END_DATA; )
|
2009-09-25 16:17:18 +02:00
|
|
|
{
|
|
|
|
*dest++ = *src++;
|
|
|
|
}
|
2013-03-22 15:49:21 +01:00
|
|
|
|
2009-09-25 16:17:18 +02:00
|
|
|
showprogress('C');
|
|
|
|
|
|
|
|
/* Perform early serial initialization */
|
|
|
|
|
2012-02-11 04:50:52 +01:00
|
|
|
#ifdef USE_EARLYSERIALINIT
|
2009-09-25 16:17:18 +02:00
|
|
|
up_earlyserialinit();
|
|
|
|
#endif
|
|
|
|
showprogress('D');
|
|
|
|
|
2013-03-22 15:49:21 +01:00
|
|
|
/* For the case of the separate user-/kernel-space build, perform whatever
|
|
|
|
* platform specific initialization of the user memory is required.
|
|
|
|
* Normally this just means initializing the user space .data and .bss
|
|
|
|
* segments.
|
|
|
|
*/
|
|
|
|
|
2014-08-29 22:47:22 +02:00
|
|
|
#ifdef CONFIG_BUILD_PROTECTED
|
2013-03-22 15:49:21 +01:00
|
|
|
stm32_userspace();
|
|
|
|
showprogress('E');
|
|
|
|
#endif
|
|
|
|
|
2009-09-25 16:17:18 +02:00
|
|
|
/* Initialize onboard resources */
|
|
|
|
|
|
|
|
stm32_boardinitialize();
|
2013-03-22 15:49:21 +01:00
|
|
|
showprogress('F');
|
2009-09-25 16:17:18 +02:00
|
|
|
|
|
|
|
/* Then start NuttX */
|
|
|
|
|
|
|
|
showprogress('\r');
|
|
|
|
showprogress('\n');
|
2013-11-01 18:16:51 +01:00
|
|
|
|
2015-01-24 13:49:51 +01:00
|
|
|
#ifdef CONFIG_STACK_COLORATION
|
2013-11-01 18:16:51 +01:00
|
|
|
/* Set the IDLE stack to the coloration value and jump into os_start() */
|
|
|
|
|
2013-11-01 23:06:43 +01:00
|
|
|
go_os_start((FAR void *)&_ebss, CONFIG_IDLETHREAD_STACKSIZE);
|
2013-11-01 18:16:51 +01:00
|
|
|
#else
|
|
|
|
/* Call os_start() */
|
|
|
|
|
2009-09-25 16:17:18 +02:00
|
|
|
os_start();
|
|
|
|
|
|
|
|
/* Shoulnd't get here */
|
|
|
|
|
2015-10-07 21:45:15 +02:00
|
|
|
for (; ; );
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2013-11-01 18:16:51 +01:00
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#endif
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2009-09-25 16:17:18 +02:00
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}
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