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("$FreeBSD$");
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
44 static int ofwd_init(void);
45 static int ofwd_strategy(void *devdata, int flag, daddr_t dblk,
46 size_t size, char *buf, size_t *rsize);
47 static int ofwd_open(struct open_file *f, ...);
48 static int ofwd_close(struct open_file *f);
49 static int ofwd_ioctl(struct open_file *f, u_long cmd, void *data);
50 static void ofwd_print(int verbose);
51
52 struct 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 */
76 static struct ofw_devdesc *kdp;
77
78 static int
ofwd_init(void)79 ofwd_init(void)
80 {
81
82 return (0);
83 }
84
85 static int
ofwd_strategy(void * devdata,int flag __unused,daddr_t dblk,size_t size,char * buf,size_t * rsize)86 ofwd_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
117 static int
ofwd_open(struct open_file * f,...)118 ofwd_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
142 static int
ofwd_close(struct open_file * f)143 ofwd_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
156 static int
ofwd_ioctl(struct open_file * f __unused,u_long cmd __unused,void * data __unused)157 ofwd_ioctl(struct open_file *f __unused, u_long cmd __unused,
158 void *data __unused)
159 {
160
161 return (EINVAL);
162 }
163
164 static void
ofwd_print(int verbose __unused)165 ofwd_print(int verbose __unused)
166 {
167
168 }
169