nes-proj/cpu/msp430/mtarch.c

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/*
* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
*
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* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: mtarch.c,v 1.4 2007/09/14 20:21:01 nvt-se Exp $
*/
#include <stdio.h>
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#include "sys/mt.h"
/*--------------------------------------------------------------------------*/
void
mtarch_init(void)
{
}
/*--------------------------------------------------------------------------*/
void
mtarch_start(struct mtarch_thread *t,
void (*function)(void *), void *data)
{
int i;
for(i = 0; i < MTARCH_STACKSIZE; ++i) {
t->stack[i] = i;
}
t->sp = &t->stack[MTARCH_STACKSIZE - 1];
*t->sp = (unsigned short)mt_exit;
--t->sp;
*t->sp = (unsigned short)function;
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--t->sp;
/* Space for registers. */
t->sp -= 11;
}
/*--------------------------------------------------------------------------*/
static unsigned short *sptmp;
static struct mtarch_thread *running;
static void
sw(void)
{
sptmp = running->sp;
__asm__("push r4");
__asm__("push r5");
__asm__("push r6");
__asm__("push r7");
__asm__("push r8");
__asm__("push r9");
__asm__("push r10");
__asm__("push r11");
__asm__("push r12");
__asm__("push r13");
__asm__("push r14");
__asm__("push r15");
__asm__("mov.w r1,%0" : "=r" (running->sp));
__asm__("mov.w %0,r1" : : "m" (sptmp));
__asm__("pop r15");
__asm__("pop r14");
__asm__("pop r13");
__asm__("pop r12");
__asm__("pop r11");
__asm__("pop r10");
__asm__("pop r9");
__asm__("pop r8");
__asm__("pop r7");
__asm__("pop r6");
__asm__("pop r5");
__asm__("pop r4");
}
/*--------------------------------------------------------------------------*/
void
mtarch_exec(struct mtarch_thread *t)
{
running = t;
sw();
running = NULL;
}
/*--------------------------------------------------------------------------*/
void
mtarch_remove(void)
{
}
/*--------------------------------------------------------------------------*/
void
mtarch_yield(void)
{
sw();
}
/*--------------------------------------------------------------------------*/
void
mtarch_pstop(void)
{
}
/*--------------------------------------------------------------------------*/
void
mtarch_pstart(void)
{
}
/*--------------------------------------------------------------------------*/
int
mtarch_stack_usage(struct mt_thread *t)
{
int i;
for(i = 0; i < MTARCH_STACKSIZE; ++i) {
if(t->thread.stack[i] != (unsigned short)i) {
return MTARCH_STACKSIZE - i;
}
}
return MTARCH_STACKSIZE;
}
/*--------------------------------------------------------------------------*/