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169 lines
4.5 KiB
C
169 lines
4.5 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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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
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* are met:
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute 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 INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* 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 INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: mtarch.c,v 1.6 2008/11/21 10:28:32 fros4943 Exp $
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*/
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#include <stdio.h>
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#include "sys/mt.h"
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static unsigned short *sptmp;
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static struct mtarch_thread *running;
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/*--------------------------------------------------------------------------*/
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void
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mtarch_init(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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static void
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mtarch_wrapper(void)
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{
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/* Call thread function with argument */
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((void (*)(void *))running->function)((void*)running->data);
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_start(struct mtarch_thread *t,
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void (*function)(void *), void *data)
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{
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int i;
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for(i = 0; i < MTARCH_STACKSIZE; ++i) {
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t->stack[i] = i;
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}
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t->sp = &t->stack[MTARCH_STACKSIZE - 1];
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*t->sp = (unsigned short)mt_exit;
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--t->sp;
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*t->sp = (unsigned short)mtarch_wrapper;
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--t->sp;
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/* Space for registers. */
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t->sp -= 11;
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/* Store function and argument (used in mtarch_wrapper) */
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t->data = data;
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t->function = function;
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}
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/*--------------------------------------------------------------------------*/
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static void
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sw(void)
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{
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sptmp = running->sp;
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__asm__("push r4");
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__asm__("push r5");
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__asm__("push r6");
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__asm__("push r7");
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__asm__("push r8");
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__asm__("push r9");
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__asm__("push r10");
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__asm__("push r11");
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__asm__("push r12");
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__asm__("push r13");
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__asm__("push r14");
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__asm__("push r15");
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__asm__("mov.w r1,%0" : "=r" (running->sp));
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__asm__("mov.w %0,r1" : : "m" (sptmp));
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__asm__("pop r15");
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__asm__("pop r14");
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__asm__("pop r13");
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__asm__("pop r12");
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__asm__("pop r11");
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__asm__("pop r10");
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__asm__("pop r9");
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__asm__("pop r8");
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__asm__("pop r7");
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__asm__("pop r6");
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__asm__("pop r5");
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__asm__("pop r4");
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_exec(struct mtarch_thread *t)
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{
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running = t;
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sw();
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running = NULL;
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_remove(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_yield(void)
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{
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sw();
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_pstop(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_pstart(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_stop(struct mtarch_thread *thread)
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{
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}
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/*--------------------------------------------------------------------------*/
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int
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mtarch_stack_usage(struct mt_thread *t)
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{
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int i;
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for(i = 0; i < MTARCH_STACKSIZE; ++i) {
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if(t->thread.stack[i] != (unsigned short)i) {
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return MTARCH_STACKSIZE - i;
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}
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}
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return MTARCH_STACKSIZE;
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}
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/*--------------------------------------------------------------------------*/
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