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      1 /*	$NetBSD: dk.c,v 1.1 2014/02/24 07:23:43 skrll Exp $	*/
      2 
      3 /*	$OpenBSD: dk.c,v 1.5 1999/04/20 20:01:01 mickey Exp $	*/
      4 
      5 /*
      6  * Copyright 1996 1995 by Open Software Foundation, Inc.
      7  *              All Rights Reserved
      8  *
      9  * Permission to use, copy, modify, and distribute this software and
     10  * its documentation for any purpose and without fee is hereby granted,
     11  * provided that the above copyright notice appears in all copies and
     12  * that both the copyright notice and this permission notice appear in
     13  * supporting documentation.
     14  *
     15  * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
     16  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     17  * FOR A PARTICULAR PURPOSE.
     18  *
     19  * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
     20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
     21  * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
     22  * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
     23  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     24  *
     25  */
     26 
     27 #include "libsa.h"
     28 
     29 #include <sys/param.h>
     30 #include <sys/disklabel.h>
     31 #include <sys/reboot.h>
     32 #include <machine/pdc.h>
     33 #include <machine/iomod.h>
     34 
     35 #include "dev_hppa.h"
     36 
     37 const char *dk_disklabel(struct hppa_dev *, struct disklabel *);
     38 
     39 iodcio_t dkiodc;	/* boot IODC entry point */
     40 
     41 const char *
     42 dk_disklabel(struct hppa_dev *dp, struct disklabel *label)
     43 {
     44 	char buf[DEV_BSIZE];
     45 	size_t ret;
     46 
     47 	if (iodcstrategy(dp, F_READ, LABELSECTOR, DEV_BSIZE, buf, &ret) ||
     48 	    ret != DEV_BSIZE)
     49 		return "can't read disklabel";
     50 
     51 	return (getdisklabel(buf, label));
     52 }
     53 
     54 int
     55 dkopen(struct open_file *f, ...)
     56 {
     57 	struct disklabel dkl;
     58 	struct hppa_dev *dp = f->f_devdata;
     59 	const char *st;
     60 	u_int i;
     61 
     62 #ifdef	DEBUG
     63 	if (debug)
     64 		printf("dkopen(%p)\n", f);
     65 #endif
     66 
     67 	if (!(dp->pz_dev = pdc_findev(-1, PCL_RANDOM)))
     68 		return ENXIO;
     69 
     70 	dp->part_off = 0;
     71 	st = NULL;
     72 #ifdef DEBUG
     73 	if (debug)
     74 		printf ("disklabel\n");
     75 #endif
     76 	if ((st = dk_disklabel(dp, &dkl)) != NULL) {
     77 #ifdef DEBUG
     78 		if (debug)
     79 			printf ("dkopen: %s\n", st);
     80 #endif
     81 	/*
     82 	 * Ignore disklabel errors for this two reasons:
     83 	 * 1. It is possible to dd(1) a LIF image containing the bootloader
     84 	 * and a kernel with attached RAM disk to disk and boot it. That way
     85 	 * the netboot installation LIF image is also usable as disk boot
     86 	 * image.
     87 	 * 2. Some old 700 machines report a wrong device class in
     88 	 * PAGE0->mem_boot.pz_class when net booting. (PCL_RANDOM instead
     89 	 * PCL_NET_MASK|PCL_SEQU) So the bootloader thinks it is booting
     90 	 * from disk when it is actually net booting. The net boot LIF image
     91 	 * contains no disklabel so the test for the disklabel will fail.
     92 	 * If the device open fails if there is no disklabel we are not able
     93 	 * to netboot those machines.
     94 	 * Therefore the error is ignored. The bootloader will fall back to
     95 	 * LIF later when there is no disklabel / FFS partition.
     96 	 * At the moment it doesn't matter that the wrong device type ("dk"
     97 	 * instead "lf") is used, as all I/O is abstracted by the firmware.
     98 	 * To get the correct device type it would be necessary to add a
     99 	 * quirk table to the switch() in dev_hppa.c:devboot().
    100 	 */
    101 	} else {
    102 		i = B_PARTITION(dp->bootdev);
    103 #ifdef DEBUG
    104 		if (debug)
    105 			printf("bootdev 0x%x, partition %u\n", dp->bootdev, i);
    106 #endif
    107 		if (i >= dkl.d_npartitions || !dkl.d_partitions[i].p_size) {
    108 			return (EPART);
    109 		}
    110 		dp->part_off = dkl.d_partitions[i].p_offset * dkl.d_secsize;
    111 	}
    112 #ifdef DEBUGBUG
    113 	if (debug)
    114 		printf ("dkopen() ret\n");
    115 #endif
    116 	return (0);
    117 }
    118 
    119 int
    120 dkclose(struct open_file *f)
    121 {
    122 	dealloc(f->f_devdata, sizeof(struct hppa_dev));
    123 	f->f_devdata = NULL;
    124 	return 0;
    125 }
    126