2 * Copyright (C) 2000 Benno Rice.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
30 * Disk I/O routines using Open Firmware
33 #include <sys/param.h>
35 #include <netinet/in.h>
37 #include <machine/stdarg.h>
42 #include "bootstrap.h"
45 static int ofwd_init(void);
46 static int ofwd_strategy(void *devdata, int flag, daddr_t dblk,
47 size_t size, char *buf, size_t *rsize);
48 static int ofwd_open(struct open_file *f, ...);
49 static int ofwd_close(struct open_file *f);
50 static int ofwd_ioctl(struct open_file *f, u_long cmd, void *data);
51 static int ofwd_print(int verbose);
53 struct devsw ofwdisk = {
65 * We're not guaranteed to be able to open a device more than once and there
66 * is no OFW standard method to determine whether a device is already opened.
67 * Opening a device multiple times simultaneously happens to work with most
68 * OFW block device drivers but triggers a trap with at least the driver for
69 * the on-board controllers of Sun Fire V100 and Ultra 1. Upper layers and MI
70 * code expect to be able to open a device more than once however. Given that
71 * different partitions of the same device might be opened at the same time as
72 * done by ZFS, we can't generally just keep track of the opened devices and
73 * reuse the instance handle when asked to open an already opened device. So
74 * the best we can do is to cache the lastly used device path and close and
75 * open devices in ofwd_strategy() as needed.
77 static struct ofw_devdesc *kdp;
87 ofwd_strategy(void *devdata, int flag __unused, daddr_t dblk, size_t size,
88 char *buf, size_t *rsize)
90 struct ofw_devdesc *dp = (struct ofw_devdesc *)devdata;
96 #if !defined(__powerpc__)
97 OF_close(kdp->d_handle);
101 if ((dp->d_handle = OF_open(dp->d_path)) == -1)
108 if (OF_seek(dp->d_handle, pos) < 0)
110 n = OF_read(dp->d_handle, buf, size);
111 if (n < 0 && n != -2)
119 ofwd_open(struct open_file *f, ...)
121 struct ofw_devdesc *dp;
125 dp = va_arg(vl, struct ofw_devdesc *);
130 OF_close(kdp->d_handle);
133 if ((dp->d_handle = OF_open(dp->d_path)) == -1) {
134 printf("%s: Could not open %s\n", __func__,
144 ofwd_close(struct open_file *f)
146 struct ofw_devdesc *dev = f->f_devdata;
149 #if !defined(__powerpc__)
150 OF_close(dev->d_handle);
158 ofwd_ioctl(struct open_file *f, u_long cmd, void *data)
160 struct ofw_devdesc *dev = f->f_devdata;
165 case DIOCGSECTORSIZE:
166 block_size = OF_block_size(dev->d_handle);
167 *(u_int *)data = block_size;
170 block_size = OF_block_size(dev->d_handle);
171 n = OF_blocks(dev->d_handle);
172 *(uint64_t *)data = (uint64_t)(n * block_size);
181 ofwd_print(int verbose __unused)