Annotation of sys/arch/alpha/stand/boot/disk.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: disk.c,v 1.11 2003/06/02 23:27:44 millert 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
57: diskstrategy(devdata, rw, bn, reqcnt, addrvoid, cnt)
58: void *devdata;
59: int rw;
60: daddr_t bn;
61: size_t reqcnt;
62: void *addrvoid;
63: size_t *cnt; /* out: number of bytes transferred */
64: {
65: char *addr = addrvoid;
66: struct disk_softc *sc;
67: struct partition *pp;
68: prom_return_t ret;
69: int s;
70:
71: if ((reqcnt & 0xffffff) != reqcnt ||
72: reqcnt == 0)
73: asm("call_pal 0");
74:
75: twiddle();
76:
77: /* Partial-block transfers not handled. */
78: if (reqcnt & (DEV_BSIZE - 1)) {
79: *cnt = 0;
80: return (EINVAL);
81: }
82:
83: sc = (struct disk_softc *)devdata;
84: pp = &sc->sc_label.d_partitions[sc->sc_part];
85:
86: ret.bits = prom_read(sc->sc_fd, reqcnt, addr, bn + pp->p_offset);
87: if (ret.u.status)
88: return (EIO);
89: *cnt = ret.u.retval;
90: return (0);
91: }
92:
93: int
94: diskopen(f, ctlr, unit, part)
95: struct open_file *f;
96: int ctlr, unit, part;
97: {
98: struct disklabel *lp;
99: prom_return_t ret;
100: size_t cnt;
101: int devlen, i;
102: char *msg, buf[DEV_BSIZE], devname[32];
103: struct disk_softc *sc;
104:
105: if (unit >= 16 || part >= MAXPARTITIONS)
106: return (ENXIO);
107: /*
108: * XXX
109: * We don't know what device names look like yet,
110: * so we can't change them.
111: */
112: ret.bits = prom_getenv(PROM_E_BOOTED_DEV, devname, sizeof(devname));
113: devlen = ret.u.retval;
114:
115: ret.bits = prom_open(devname, devlen);
116: if (ret.u.status == 2)
117: return (ENXIO);
118: if (ret.u.status == 3)
119: return (EIO);
120:
121: sc = alloc(sizeof(struct disk_softc));
122: bzero(sc, sizeof(struct disk_softc));
123: f->f_devdata = (void *)sc;
124:
125: sc->sc_fd = ret.u.retval;
126: sc->sc_ctlr = ctlr;
127: sc->sc_unit = unit;
128: sc->sc_part = part;
129:
130: /* Try to read disk label and partition table information. */
131: lp = &sc->sc_label;
132: lp->d_secsize = DEV_BSIZE;
133: lp->d_secpercyl = 1;
134: lp->d_npartitions = MAXPARTITIONS;
135: lp->d_partitions[part].p_offset = 0;
136: lp->d_partitions[part].p_size = 0x7fffffff;
137: i = diskstrategy(sc, F_READ,
138: (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt);
139: if (i || cnt != DEV_BSIZE) {
140: printf("disk%d: error reading disk label\n", unit);
141: goto bad;
142: } else if (((struct disklabel *)(buf + LABELOFFSET))->d_magic !=
143: DISKMAGIC) {
144: /* No label at all. Fake all partitions as whole disk. */
145: for (i = 0; i < MAXPARTITIONS; i++) {
146: lp->d_partitions[part].p_offset = 0;
147: lp->d_partitions[part].p_size = 0x7fffffff;
148: }
149: } else {
150: msg = getdisklabel(buf + LABELOFFSET, lp);
151: if (msg) {
152: printf("disk%d: %s\n", unit, msg);
153: goto bad;
154: }
155: }
156:
157: if (part >= lp->d_npartitions || lp->d_partitions[part].p_size == 0) {
158: bad: free(sc, sizeof(struct disk_softc));
159: return (ENXIO);
160: }
161: return (0);
162: }
163:
164: diskclose(f)
165: struct open_file *f;
166: {
167: struct disk_softc *sc;
168:
169: sc = f->f_devdata;
170: (void)prom_close(sc->sc_fd);
171:
172: free(sc, sizeof(struct disk_softc));
173: f->f_devdata = NULL;
174: return (0);
175: }
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