ofw_disk.c revision 236579 
1/*-
2 * Copyright (C) 2000 Benno Rice.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: head/sys/boot/ofw/libofw/ofw_disk.c 236579 2012-06-04 20:45:33Z marius $");
28
29/*
30 * Disk I/O routines using Open Firmware
31 */
32
33#include <sys/param.h>
34
35#include <netinet/in.h>
36
37#include <machine/stdarg.h>
38
39#include <stand.h>
40
41#include "bootstrap.h"
42#include "libofw.h"
43
44static int	ofwd_init(void);
45static int	ofwd_strategy(void *devdata, int flag, daddr_t dblk,
46		    size_t size, char *buf, size_t *rsize);
47static int	ofwd_open(struct open_file *f, ...);
48static int	ofwd_close(struct open_file *f);
49static int	ofwd_ioctl(struct open_file *f, u_long cmd, void *data);
50static void	ofwd_print(int verbose);
51
52struct devsw ofwdisk = {
53	"block",
54	DEVT_DISK,
55	ofwd_init,
56	ofwd_strategy,
57	ofwd_open,
58	ofwd_close,
59	ofwd_ioctl,
60	ofwd_print
61};
62
63/*
64 * We're not guaranteed to be able to open a device more than once and there
65 * is no OFW standard method to determine whether a device is already opened.
66 * Opening a device multiple times simultaneously happens to work with most
67 * OFW block device drivers but triggers a trap with at least the driver for
68 * the on-board controllers of Sun Fire V100 and Ultra 1.  Upper layers and MI
69 * code expect to be able to open a device more than once however.  Given that
70 * different partitions of the same device might be opened at the same time as
71 * done by ZFS, we can't generally just keep track of the opened devices and
72 * reuse the instance handle when asked to open an already opened device.  So
73 * the best we can do is to cache the lastly used device path and close and
74 * open devices in ofwd_strategy() as needed.
75 */
76static struct ofw_devdesc *kdp;
77
78static int
79ofwd_init(void)
80{
81
82	return (0);
83}
84
85static int
86ofwd_strategy(void *devdata, int flag __unused, daddr_t dblk, size_t size,
87    char *buf, size_t *rsize)
88{
89	struct ofw_devdesc *dp = (struct ofw_devdesc *)devdata;
90	daddr_t pos;
91	int n;
92
93	if (dp != kdp) {
94		if (kdp != NULL) {
95#if !defined(__powerpc__)
96			OF_close(kdp->d_handle);
97#endif
98			kdp = NULL;
99		}
100		if ((dp->d_handle = OF_open(dp->d_path)) == -1)
101			return (ENOENT);
102		kdp = dp;
103	}
104
105	pos = dblk * 512;
106	do {
107		if (OF_seek(dp->d_handle, pos) < 0)
108			return (EIO);
109		n = OF_read(dp->d_handle, buf, size);
110		if (n < 0 && n != -2)
111			return (EIO);
112	} while (n == -2);
113	*rsize = size;
114	return (0);
115}
116
117static int
118ofwd_open(struct open_file *f, ...)
119{
120	struct ofw_devdesc *dp;
121	va_list vl;
122
123	va_start(vl, f);
124	dp = va_arg(vl, struct ofw_devdesc *);
125	va_end(vl);
126
127	if (dp != kdp) {
128		if (kdp != NULL) {
129			OF_close(kdp->d_handle);
130			kdp = NULL;
131		}
132		if ((dp->d_handle = OF_open(dp->d_path)) == -1) {
133			printf("%s: Could not open %s\n", __func__,
134			    dp->d_path);
135			return (ENOENT);
136		}
137		kdp = dp;
138	}
139	return (0);
140}
141
142static int
143ofwd_close(struct open_file *f)
144{
145	struct ofw_devdesc *dev = f->f_devdata;
146
147	if (dev == kdp) {
148#if !defined(__powerpc__)
149		OF_close(dev->d_handle);
150#endif
151		kdp = NULL;
152	}
153	return (0);
154}
155
156static int
157ofwd_ioctl(struct open_file *f __unused, u_long cmd __unused,
158    void *data __unused)
159{
160
161	return (EINVAL);
162}
163
164static void
165ofwd_print(int verbose __unused)
166{
167
168}
169