xref: /src/sys/arch/hppa/stand/common/dk.c

/*	$NetBSD: dk.c,v 1.1 2014/02/24 07:23:43 skrll Exp $	*/

/*	$OpenBSD: dk.c,v 1.5 1999/04/20 20:01:01 mickey Exp $	*/

/*
 * Copyright 1996 1995 by Open Software Foundation, Inc.
 *              All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appears in all copies and
 * that both the copyright notice and this permission notice appear in
 * supporting documentation.
 *
 * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

#include "libsa.h"

#include <sys/param.h>
#include <sys/disklabel.h>
#include <sys/reboot.h>
#include <machine/pdc.h>
#include <machine/iomod.h>

#include "dev_hppa.h"

const char *dk_disklabel(struct hppa_dev *, struct disklabel *);

iodcio_t dkiodc;	/* boot IODC entry point */

const char *
dk_disklabel(struct hppa_dev *dp, struct disklabel *label)
{
	char buf[DEV_BSIZE];
	size_t ret;

	if (iodcstrategy(dp, F_READ, LABELSECTOR, DEV_BSIZE, buf, &ret) ||
	    ret != DEV_BSIZE)
		return "can't read disklabel";

	return (getdisklabel(buf, label));
}

int
dkopen(struct open_file *f, ...)
{
	struct disklabel dkl;
	struct hppa_dev *dp = f->f_devdata;
	const char *st;
	u_int i;

#ifdef	DEBUG
	if (debug)
		printf("dkopen(%p)\n", f);
#endif

	if (!(dp->pz_dev = pdc_findev(-1, PCL_RANDOM)))
		return ENXIO;

	dp->part_off = 0;
	st = NULL;
#ifdef DEBUG
	if (debug)
		printf ("disklabel\n");
#endif
	if ((st = dk_disklabel(dp, &dkl)) != NULL) {
#ifdef DEBUG
		if (debug)
			printf ("dkopen: %s\n", st);
#endif
	/*
	 * Ignore disklabel errors for this two reasons:
	 * 1. It is possible to dd(1) a LIF image containing the bootloader
	 * and a kernel with attached RAM disk to disk and boot it. That way
	 * the netboot installation LIF image is also usable as disk boot
	 * image.
	 * 2. Some old 700 machines report a wrong device class in
	 * PAGE0->mem_boot.pz_class when net booting. (PCL_RANDOM instead
	 * PCL_NET_MASK|PCL_SEQU) So the bootloader thinks it is booting
	 * from disk when it is actually net booting. The net boot LIF image
	 * contains no disklabel so the test for the disklabel will fail.
	 * If the device open fails if there is no disklabel we are not able
	 * to netboot those machines.
	 * Therefore the error is ignored. The bootloader will fall back to
	 * LIF later when there is no disklabel / FFS partition.
	 * At the moment it doesn't matter that the wrong device type ("dk"
	 * instead "lf") is used, as all I/O is abstracted by the firmware.
	 * To get the correct device type it would be necessary to add a
	 * quirk table to the switch() in dev_hppa.c:devboot().
	 */
	} else {
		i = B_PARTITION(dp->bootdev);
#ifdef DEBUG
		if (debug)
			printf("bootdev 0x%x, partition %u\n", dp->bootdev, i);
#endif
		if (i >= dkl.d_npartitions || !dkl.d_partitions[i].p_size) {
			return (EPART);
		}
		dp->part_off = dkl.d_partitions[i].p_offset * dkl.d_secsize;
	}
#ifdef DEBUGBUG
	if (debug)
		printf ("dkopen() ret\n");
#endif
	return (0);
}

int
dkclose(struct open_file *f)
{
	dealloc(f->f_devdata, sizeof(struct hppa_dev));
	f->f_devdata = NULL;
	return 0;
}