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 *
dk_disklabel(struct hppa_dev * dp,struct disklabel * label)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
dkopen(struct open_file * f,...)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
dkclose(struct open_file * f)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