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Import of OpenBSD 4.2 release kernel tree with initial code to support 
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO

Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)

/*	$OpenBSD: hfs.c,v 1.4 2005/09/26 19:55:47 kettenis Exp $	*/
/*	$NetBSD: hfs.c,v 1.1 2000/11/14 11:25:35 tsubai Exp $	*/

/*-
 * Copyright (c) 2000 Tsubai Masanari.  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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

#include <sys/param.h>
#include <lib/libkern/libkern.h>
#include <lib/libsa/stand.h>

#include <openfirm.h>
#include <hfs.h>

static int OF_fd;	/* XXX */

int
hfs_open(char *path, struct open_file *f)
{
	int chosen;
	char bootpath[128], *cp;

	if ((chosen = OF_finddevice("/chosen")) == -1)
		return ENXIO;
	bzero(bootpath, sizeof bootpath);
	OF_getprop(chosen, "bootpath", bootpath, sizeof bootpath);

#ifdef HAVE_STAND_STRRCHR
	cp = strrchr(bootpath, ',');
#else
	cp = bootpath;
	cp += strlen(bootpath);
	for (; *cp != ','; cp--) {
		if (cp == bootpath) {
			cp = NULL;
			break;
		}
	}
#endif
	if (cp == NULL)
		return ENXIO;

	strlcpy(cp + 1, path, bootpath + sizeof bootpath - (cp + 1));
	OF_fd = OF_open(bootpath);
	if (OF_fd == -1)
		return ENOENT;
	return 0;
}

int
hfs_close(struct open_file *f)
{
	OF_close(OF_fd);
	return 0;
}

int
hfs_read(struct open_file *f, void *start, size_t size, size_t *resid)
{
	int len;

	len = OF_read(OF_fd, start, size);
	if (len == -1)
		return EIO;
	size -= len;
	if (resid)
		*resid = size;
	return 0;
}

int
hfs_write(struct open_file *f, void *start, size_t size, size_t *resid)
{
	printf("hfs_write\n");
	return ENXIO;
}

off_t
hfs_seek(struct open_file *f, off_t offset, int where)
{
	switch (where) {
	case SEEK_SET:
		return OF_seek(OF_fd, offset);
	case SEEK_CUR:
	case SEEK_END:
	default:
		return -1;
	}
}

int
hfs_stat(struct open_file *f, struct stat *sb)
{
	return 0;
}