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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: disk.c,v 1.11 2003/06/02 23:27:44 millert Exp $	*/
/*	$NetBSD: disk.c,v 1.6 1997/04/06 08:40:33 cgd Exp $	*/

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
 *
 * 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 University 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 REGENTS 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 REGENTS 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.
 *
 *	@(#)rz.c	8.1 (Berkeley) 6/10/93
 */

#include <lib/libsa/stand.h>

#include <sys/param.h>
#include <sys/disklabel.h>

#include <machine/rpb.h>
#include <machine/prom.h>

#include "disk.h"

struct	disk_softc {
	int	sc_fd;			/* PROM channel number */
	int	sc_ctlr;		/* controller number */
	int	sc_unit;		/* disk unit number */
	int	sc_part;		/* disk partition number */
	struct	disklabel sc_label;	/* disk label for this disk */
};

int
diskstrategy(devdata, rw, bn, reqcnt, addrvoid, cnt)
	void *devdata;
	int rw;
	daddr_t bn;
	size_t reqcnt;
	void *addrvoid;
	size_t *cnt;	/* out: number of bytes transferred */
{
	char *addr = addrvoid;
	struct disk_softc *sc;
	struct partition *pp;
	prom_return_t ret;
	int s;

	if ((reqcnt & 0xffffff) != reqcnt ||
	    reqcnt == 0)
		asm("call_pal 0");
	    
	twiddle();

	/* Partial-block transfers not handled. */
	if (reqcnt & (DEV_BSIZE - 1)) {
		*cnt = 0;
		return (EINVAL);
	}

	sc = (struct disk_softc *)devdata;
	pp = &sc->sc_label.d_partitions[sc->sc_part];

	ret.bits = prom_read(sc->sc_fd, reqcnt, addr, bn + pp->p_offset);
	if (ret.u.status)
		return (EIO);
	*cnt = ret.u.retval;
	return (0);
}

int
diskopen(f, ctlr, unit, part)
	struct open_file *f;
	int ctlr, unit, part;
{
	struct disklabel *lp;
	prom_return_t ret;
	size_t cnt;
	int devlen, i;
	char *msg, buf[DEV_BSIZE], devname[32];
	struct disk_softc *sc;

	if (unit >= 16 || part >= MAXPARTITIONS)
		return (ENXIO);
	/* 
	 * XXX
	 * We don't know what device names look like yet,
	 * so we can't change them.
	 */
	ret.bits = prom_getenv(PROM_E_BOOTED_DEV, devname, sizeof(devname));
	devlen = ret.u.retval;

	ret.bits = prom_open(devname, devlen);
	if (ret.u.status == 2)
		return (ENXIO);
	if (ret.u.status == 3)
		return (EIO);

	sc = alloc(sizeof(struct disk_softc));
	bzero(sc, sizeof(struct disk_softc));
	f->f_devdata = (void *)sc;

	sc->sc_fd = ret.u.retval;
	sc->sc_ctlr = ctlr;
	sc->sc_unit = unit;
	sc->sc_part = part;

	/* Try to read disk label and partition table information. */
	lp = &sc->sc_label;
	lp->d_secsize = DEV_BSIZE;
	lp->d_secpercyl = 1;
	lp->d_npartitions = MAXPARTITIONS;
	lp->d_partitions[part].p_offset = 0;
	lp->d_partitions[part].p_size = 0x7fffffff;
	i = diskstrategy(sc, F_READ,
	    (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt);
	if (i || cnt != DEV_BSIZE) {
		printf("disk%d: error reading disk label\n", unit);
		goto bad;
	} else if (((struct disklabel *)(buf + LABELOFFSET))->d_magic !=
		    DISKMAGIC) {
		/* No label at all.  Fake all partitions as whole disk. */
		for (i = 0; i < MAXPARTITIONS; i++) {
			lp->d_partitions[part].p_offset = 0;
			lp->d_partitions[part].p_size = 0x7fffffff;
		}
	} else {
		msg = getdisklabel(buf + LABELOFFSET, lp);
		if (msg) {
			printf("disk%d: %s\n", unit, msg);
			goto bad;
		}
	}

	if (part >= lp->d_npartitions || lp->d_partitions[part].p_size == 0) {
bad:		free(sc, sizeof(struct disk_softc));
		return (ENXIO);
	}
	return (0);
}

diskclose(f)
	struct open_file *f;
{
	struct disk_softc *sc;

	sc = f->f_devdata;
	(void)prom_close(sc->sc_fd);

	free(sc, sizeof(struct disk_softc));
	f->f_devdata = NULL;
	return (0);
}