120 lines
3.8 KiB
C
120 lines
3.8 KiB
C
/*
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* Copyright (c) 2016, Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
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* All rights reserved.
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be 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 "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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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* \addtogroup arm
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* @{
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*
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* \defgroup arm-cm-mtarch ARM Cortex-M support for Contiki multi-threading
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*
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* All the Cortex-M devices supported by CMSIS-CORE are supported.
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*
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* An exception handler can decide to make the main Contiki thread preempt any
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* running mt thread by calling mtarch_pstart() (e.g. to perform urgent
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* operations that have been triggered by some event or that had been
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* scheduled). If the running thread is already the main Contiki thread, then
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* nothing happens. The corresponding task switch takes place when leaving
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* Handler mode. The main Contiki thread then resumes after the call to
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* mt_exec() that yielded to the preempted mt thread.
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* @{
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*
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* \file
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* Header file for the ARM Cortex-M support for Contiki multi-threading.
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*/
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#ifndef MTARCH_H_
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#define MTARCH_H_
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#include "contiki-conf.h"
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#include "sys/cc.h"
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#include <stdint.h>
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#ifndef MTARCH_CONF_STACKSIZE
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/** Thread stack size configuration, expressed as a number of 32-bit words. */
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#define MTARCH_CONF_STACKSIZE 256
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#endif
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/** Actual stack size, with minimum size and alignment requirements enforced. */
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#define MTARCH_STACKSIZE ((MAX(MTARCH_CONF_STACKSIZE, \
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sizeof(struct mtarch_thread_context) / \
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sizeof(uint32_t)) + 1) & ~1)
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/**
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* Structure of a saved thread context.
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*
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* <tt>xpsr..r0</tt> are managed by the processor (except in mtarch_start()),
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* while the other register values are handled by the software.
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*/
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struct mtarch_thread_context {
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#if __ARM_ARCH == 7
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uint32_t r4;
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uint32_t r5;
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uint32_t r6;
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uint32_t r7;
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#endif
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uint32_t r8;
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uint32_t r9;
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uint32_t r10;
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uint32_t r11;
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uint32_t exc_return;
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#if __ARM_ARCH == 6
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uint32_t r4;
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uint32_t r5;
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uint32_t r6;
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uint32_t r7;
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#endif
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uint32_t r0;
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uint32_t r1;
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uint32_t r2;
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uint32_t r3;
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uint32_t r12;
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uint32_t lr;
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uint32_t pc;
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uint32_t xpsr;
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};
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struct mtarch_thread {
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uint32_t psp;
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union {
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struct {
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uint32_t free[MTARCH_STACKSIZE -
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sizeof(struct mtarch_thread_context) / sizeof(uint32_t)];
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struct mtarch_thread_context context;
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} start_stack;
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uint32_t stack[MTARCH_STACKSIZE];
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} CC_ALIGN(8);
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};
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#endif /* MTARCH_H_ */
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/**
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* @}
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* @}
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*/
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