sys/arch/hp700/stand/common/dk.c

   1 /*      $NetBSD: dk.c,v 1.9 2009/05/07 15:21:39 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 }