nes-proj/cpu/mc1322x/contiki-misc.c

/*
 * Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
 * to the MC1322x project (http://mc1322x.devl.org) and Contiki.
 *
 * 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 OS.
 *
 * $Id: contiki-misc.c,v 1.2 2010/11/07 13:52:12 maralvira Exp $
 */

#include <stdio.h>
#include "contiki.h"
#include "mc1322x.h"
#include <sys/types.h>

int raise(void)
{
	return 0;
}

void srand(unsigned int seed) {
	*MACA_RANDOM = seed;
}

int rand(void) {
	return (int)*MACA_RANDOM;
}

extern int  __HEAP_START;
extern int  __HEAP_END;

caddr_t _sbrk ( int incr )
{
	static unsigned char *heap = NULL;
	unsigned char *prev_heap;

	if (heap == NULL) {
		heap = (unsigned char *)&__HEAP_START;
	}
	prev_heap = heap;
	/* check removed to show basic approach */

	if((heap + incr) >= (unsigned char *)&__HEAP_END) return((void *)-1);

	heap += incr;

	return (caddr_t) prev_heap;
}