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first steps to let Prex kernel compile and run on arm-cats platform.
clocks and interrupts subsystems are stubs, but kernel diagnostics messages
work (using serial port 0).
kernel boots and panics in thread_init, but at least it boots and prints something!
it's far more easy and fun to hack code which compiles (:
still more work on the road.

/*
 * $Id: clock.c,v 1.1 2008/07/18 20:21:48 nbrk Exp $
 */
/*-
 * Copyright (c) 2005-2007, Kohsuke Ohtani
 * 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 author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

/*
 * clock.c - clock driver
 */

#include <kernel.h>
#include <timer.h>
#include <irq.h>


/*
 * Clock interrupt service routine.
 * No H/W reprogram is required.
 */
static int
clock_isr(int irq)
{
#if 0
	irq_lock();
	timer_tick();
	irq_unlock();
#endif

	return INT_DONE;
}

/*
 * Initialize clock H/W chip.
 * Setup clock tick rate and install clock ISR.
 */
void
clock_init(void)
{
	/* TODO */
}