1 /* $OpenBSD: disk.c,v 1.20 2023/01/16 07:29:35 deraadt Exp $ */
2 /* $NetBSD: disk.c,v 1.6 1997/04/06 08:40:33 cgd Exp $ */
3
4 /*
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)rz.c 8.1 (Berkeley) 6/10/93
36 */
37
38 #include <lib/libsa/stand.h>
39
40 #include <sys/param.h>
41 #include <sys/disklabel.h>
42
43 #include <machine/rpb.h>
44 #include <machine/prom.h>
45
46 #include "disk.h"
47
48 struct disk_softc {
49 int sc_fd; /* PROM channel number */
50 int sc_ctlr; /* controller number */
51 int sc_unit; /* disk unit number */
52 int sc_part; /* disk partition number */
53 struct disklabel sc_label; /* disk label for this disk */
54 };
55
56 int
diskstrategy(void * devdata,int rw,daddr_t bn,size_t reqcnt,void * addrvoid,size_t * cnt)57 diskstrategy(void *devdata, int rw, daddr_t bn, size_t reqcnt, void *addrvoid,
58 size_t *cnt)
59 {
60 char *addr = addrvoid;
61 struct disk_softc *sc;
62 struct partition *pp;
63 prom_return_t ret;
64 int s;
65
66 if ((reqcnt & 0xffffff) != reqcnt ||
67 reqcnt == 0)
68 asm("call_pal 0");
69
70 twiddle();
71
72 /* Partial-block transfers not handled. */
73 if (reqcnt & (DEV_BSIZE - 1)) {
74 *cnt = 0;
75 return (EINVAL);
76 }
77
78 sc = (struct disk_softc *)devdata;
79 pp = &sc->sc_label.d_partitions[sc->sc_part];
80
81 if (rw == F_READ)
82 ret.bits = prom_read(sc->sc_fd, reqcnt, addr, bn + pp->p_offset);
83 else
84 ret.bits = prom_write(sc->sc_fd, reqcnt, addr, bn + pp->p_offset);
85 if (ret.u.status)
86 return (EIO);
87 if (cnt)
88 *cnt = ret.u.retval;
89 return (0);
90 }
91
92 int
diskopen(struct open_file * f,int ctlr,int unit,int part)93 diskopen(struct open_file *f, int ctlr, int unit, int part)
94 {
95 struct disklabel *lp;
96 prom_return_t ret;
97 size_t cnt;
98 int devlen, i;
99 char *msg, buf[DEV_BSIZE], devname[32];
100 struct disk_softc *sc;
101
102 if (unit >= 16 || part >= MAXPARTITIONS)
103 return (ENXIO);
104 /*
105 * XXX
106 * We don't know what device names look like yet,
107 * so we can't change them.
108 */
109 ret.bits = prom_getenv(PROM_E_BOOTED_DEV, devname, sizeof(devname));
110 devlen = ret.u.retval;
111
112 ret.bits = prom_open((u_int64_t)devname, devlen);
113 if (ret.u.status == 2)
114 return (ENXIO);
115 if (ret.u.status == 3)
116 return (EIO);
117
118 sc = alloc(sizeof(struct disk_softc));
119 bzero(sc, sizeof(struct disk_softc));
120 f->f_devdata = (void *)sc;
121
122 sc->sc_fd = ret.u.retval;
123 sc->sc_ctlr = ctlr;
124 sc->sc_unit = unit;
125 sc->sc_part = part;
126
127 /* Try to read disk label and partition table information. */
128 lp = &sc->sc_label;
129 lp->d_secsize = DEV_BSIZE;
130 lp->d_secpercyl = 1;
131 lp->d_npartitions = MAXPARTITIONS;
132 DL_SETPOFFSET(&lp->d_partitions[part], 0);
133 DL_SETPSIZE(&lp->d_partitions[part], 0x7fffffff);
134 i = diskstrategy(sc, F_READ,
135 LABELSECTOR, DEV_BSIZE, buf, &cnt);
136 if (i || cnt != DEV_BSIZE) {
137 printf("disk%d: error reading disk label\n", unit);
138 goto bad;
139 } else if (((struct disklabel *)(buf + LABELOFFSET))->d_magic !=
140 DISKMAGIC) {
141 /* No label at all. Fake all partitions as whole disk. */
142 for (i = 0; i < MAXPARTITIONS; i++) {
143 DL_SETPOFFSET(&lp->d_partitions[part], 0);
144 DL_SETPSIZE(&lp->d_partitions[part], 0x7fffffff);
145 }
146 } else {
147 msg = getdisklabel(buf + LABELOFFSET, lp);
148 if (msg) {
149 printf("disk%d: %s\n", unit, msg);
150 goto bad;
151 }
152 }
153
154 if (part >= lp->d_npartitions ||
155 DL_GETPSIZE(&lp->d_partitions[part]) == 0) {
156 bad: free(sc, sizeof(struct disk_softc));
157 return (ENXIO);
158 }
159 return (0);
160 }
161
162 int
diskclose(struct open_file * f)163 diskclose(struct open_file *f)
164 {
165 struct disk_softc *sc;
166
167 sc = f->f_devdata;
168 (void)prom_close(sc->sc_fd);
169
170 free(sc, sizeof(struct disk_softc));
171 f->f_devdata = NULL;
172 return (0);
173 }
174