rz.c revision 1.15 
1/*	$NetBSD: rz.c,v 1.15 1999/11/27 06:48:08 simonb Exp $	*/
2
3/*
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 *	@(#)rz.c	8.1 (Berkeley) 6/10/93
39 */
40
41#include <lib/libsa/stand.h>
42#include <machine/dec_prom.h>
43#include <machine/stdarg.h>
44
45#include <sys/param.h>
46#include <sys/disklabel.h>
47
48#include "common.h"
49#include "rz.h"
50
51struct	rz_softc {
52	int	sc_fd;			/* PROM file id */
53	int	sc_ctlr;		/* controller number */
54	int	sc_unit;		/* disk unit number */
55	int	sc_part;		/* disk partition number */
56	struct	disklabel sc_label;	/* disk label for this disk */
57};
58
59int
60rzstrategy(devdata, rw, bn, reqcnt, addr, cnt)
61	void *devdata;
62	int rw;
63	daddr_t bn;
64	size_t reqcnt;
65	void *addr;
66	size_t *cnt;	/* out: number of bytes transfered */
67{
68	register struct rz_softc *sc = (struct rz_softc *)devdata;
69	register int part = sc->sc_part;
70	register struct partition *pp = &sc->sc_label.d_partitions[part];
71	register int s;
72	long offset;
73
74	offset = bn * DEV_BSIZE;
75
76	/*
77	 * Partial-block transfers not handled.
78	 */
79	if (reqcnt & (DEV_BSIZE - 1)) {
80		*cnt = 0;
81		return (EINVAL);
82	}
83
84	offset += pp->p_offset * DEV_BSIZE;
85
86	if (callv == &callvec) {
87		/* No REX on this machine */
88		if (prom_lseek(sc->sc_fd, offset, 0) < 0)
89			return (EIO);
90		s = prom_read(sc->sc_fd, addr, reqcnt);
91	} else
92		s = bootread (offset / 512, addr, reqcnt);
93	if (s < 0)
94		return (EIO);
95
96	*cnt = s;
97	return (0);
98}
99
100int
101rzopen(struct open_file *f, ...)
102{
103	register int ctlr, unit, part;
104
105	register struct rz_softc *sc;
106	register struct disklabel *lp;
107	register int i;
108	char *msg;
109	char buf[DEV_BSIZE];
110	int cnt;
111	static char device[] = "rz(0,0,0)";
112	va_list ap;
113
114	va_start(ap, f);
115
116	ctlr = va_arg(ap, int);
117	unit = va_arg(ap, int);
118	part = va_arg(ap, int);
119	if (unit >= 8 || part >= 8)
120		return (ENXIO);
121	device[5] = '0' + unit;
122	/* NOTE: only support reads for now */
123	/* Another NOTE: bootinit on the TurboChannel doesn't look at
124	   the device string - it's provided for compatibility with
125	   the DS3100 PROMs.   As a consequence, it may be possible to
126	   boot from some other drive with these bootblocks on the 3100,
127	   but will not be possible on any TurboChannel machine. */
128
129	if (callv == &callvec)
130		i = prom_open(device, 0);
131	else
132		i = bootinit (device);
133	if (i < 0) {
134		printf("open failed\n");
135		return (ENXIO);
136	}
137
138	sc = alloc(sizeof(struct rz_softc));
139	memset(sc, 0, sizeof(struct rz_softc));
140	f->f_devdata = (void *)sc;
141
142	sc->sc_fd = i;
143	sc->sc_ctlr = ctlr;
144	sc->sc_unit = unit;
145	sc->sc_part = part;
146
147	/* try to read disk label and partition table information */
148	lp = &sc->sc_label;
149	lp->d_secsize = DEV_BSIZE;
150	lp->d_secpercyl = 1;
151	lp->d_npartitions = MAXPARTITIONS;
152	lp->d_partitions[part].p_offset = 0;
153	lp->d_partitions[part].p_size = 0x7fffffff;
154
155	i = rzstrategy(sc, F_READ, (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt);
156	if (i || cnt != DEV_BSIZE) {
157		/* printf("rz%d: error reading disk label\n", unit); */
158		goto bad;
159	}
160	msg = getdisklabel(buf, lp);
161	if (msg) {
162		/* If no label, just assume 0 and return */
163		return (0);
164	}
165
166	if (part >= lp->d_npartitions || lp->d_partitions[part].p_size == 0) {
167	bad:
168		free(sc, sizeof(struct rz_softc));
169		return (ENXIO);
170	}
171	return (0);
172}
173
174#ifndef LIBSA_NO_DEV_CLOSE
175int
176rzclose(f)
177	struct open_file *f;
178{
179	if (callv == &callvec)
180		prom_close(((struct rz_softc *)f->f_devdata)->sc_fd);
181
182	free(f->f_devdata, sizeof(struct rz_softc));
183	f->f_devdata = (void *)0;
184	return (0);
185}
186#endif
187