contiki/platform/cooja/sys/cooja_mtarch.c

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/*
* Copyright (c) 2005, Swedish Institute of Computer Science
* All rights reserved.
*
* 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.
*
* 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: cooja_mtarch.c,v 1.5 2007/04/02 08:47:28 fros4943 Exp $
*/
#include <stdio.h>
#include <string.h>
#include "sys/cooja_mt.h"
struct frame {
unsigned long flags;
unsigned long ebp;
unsigned long edi;
unsigned long esi;
unsigned long edx;
unsigned long ecx;
unsigned long ebx;
unsigned long eax;
unsigned long retaddr;
unsigned long retaddr2;
unsigned long data;
};
/*--------------------------------------------------------------------------*/
void
cooja_mtarch_init(void)
{
}
/*--------------------------------------------------------------------------*/
void
cooja_mtarch_start(struct cooja_mtarch_thread *t,
void (*function)(void *), void *data)
{
struct frame *f = (struct frame *)&t->stack[COOJA_MTARCH_STACKSIZE - sizeof(struct frame)/4];
int i;
for(i = 0; i < COOJA_MTARCH_STACKSIZE; ++i) {
t->stack[i] = i;
}
memset(f, 0, sizeof(struct frame));
f->retaddr = (unsigned long)function;
f->data = (unsigned long)data;
t->sp = (unsigned long)&f->flags;
f->ebp = (unsigned long)&f->eax;
}
/*--------------------------------------------------------------------------*/
static struct cooja_mtarch_thread *cooja_running_thread;
/*--------------------------------------------------------------------------*/
void cooja_sw(void)
{
/* Store registers */
__asm__ (
"pushl %eax\n\t"
"pushl %ebx\n\t"
"pushl %ecx\n\t"
"pushl %edx\n\t"
"pushl %esi\n\t"
"pushl %edi\n\t"
"pushl %ebp\n\t"
"pushl %ebp\n\t");
/* Switch stack pointer */
__asm__ ("movl %0, %%eax\n\t" : : "m" (cooja_running_thread));
__asm__ (
"movl 0(%eax), %ebx\n\t"
"movl %esp, 0(%eax)\n\t"
"movl %ebx, %esp\n\t"
);
/* Restore stored registers and return "our" way */
__asm__ (
"popl %ebp\n\t"
"popl %ebp\n\t"
"popl %edi\n\t"
"popl %esi\n\t"
"popl %edx\n\t"
"popl %ecx\n\t"
"popl %ebx\n\t"
"popl %eax\n\t"
"leave\n\t"
"ret\n\t"
);
}
/*--------------------------------------------------------------------------*/
void
cooja_mtarch_exec(struct cooja_mtarch_thread *t)
{
cooja_running_thread = t;
cooja_sw();
cooja_running_thread = NULL;
}
/*--------------------------------------------------------------------------*/
void
cooja_mtarch_remove(void)
{
}
/*--------------------------------------------------------------------------*/
void
cooja_mtarch_yield(void)
{
cooja_sw();
}
/*--------------------------------------------------------------------------*/
void
cooja_mtarch_pstop(void)
{
}
/*--------------------------------------------------------------------------*/
void
cooja_mtarch_pstart(void)
{
}
/*--------------------------------------------------------------------------*/
int
cooja_mtarch_stack_usage(struct cooja_mt_thread *t)
{
int i;
for(i = 0; i < COOJA_MTARCH_STACKSIZE; ++i) {
if(t->thread.stack[i] != i) {
return COOJA_MTARCH_STACKSIZE - i;
}
}
return -1;
}
/*--------------------------------------------------------------------------*/