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
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26 #include <sys/cdefs.h>
28 * Disk I/O routines using Open Firmware
31 #include <sys/param.h>
33 #include <netinet/in.h>
35 #include <machine/stdarg.h>
43 static int ofwd_init(void);
44 static int ofwd_strategy(void *devdata, int flag, daddr_t dblk,
45 size_t size, char *buf, size_t *rsize);
46 static int ofwd_open(struct open_file *f, ...);
47 static int ofwd_close(struct open_file *f);
48 static int ofwd_ioctl(struct open_file *f, u_long cmd, void *data);
49 static int ofwd_print(int verbose);
50 static char * ofwd_fmtdev(struct devdesc *);
51 static int ofwd_parsedev(struct devdesc **, const char *, const char **);
52 static bool ofwd_match(struct devsw *, const char *);
54 struct devsw ofwdisk = {
56 .dv_type = DEVT_OFDISK,
58 .dv_strategy = ofwd_strategy,
60 .dv_close = ofwd_close,
61 .dv_ioctl = ofwd_ioctl,
62 .dv_print = ofwd_print,
63 .dv_cleanup = nullsys,
64 .dv_match = ofwd_match,
65 .dv_fmtdev = ofwd_fmtdev,
66 .dv_parsedev = ofwd_parsedev,
70 * We're not guaranteed to be able to open a device more than once and there
71 * is no OFW standard method to determine whether a device is already opened.
72 * Opening a device multiple times simultaneously happens to work with most
73 * OFW block device drivers but triggers a trap with at least the driver for
74 * the on-board controllers of Sun Fire V100 and Ultra 1. Upper layers and MI
75 * code expect to be able to open a device more than once however. Given that
76 * different partitions of the same device might be opened at the same time as
77 * done by ZFS, we can't generally just keep track of the opened devices and
78 * reuse the instance handle when asked to open an already opened device. So
79 * the best we can do is to cache the lastly used device path and close and
80 * open devices in ofwd_strategy() as needed.
82 static struct ofw_devdesc *kdp;
92 ofwd_strategy(void *devdata, int flag __unused, daddr_t dblk, size_t size,
93 char *buf, size_t *rsize)
95 struct ofw_devdesc *dp = (struct ofw_devdesc *)devdata;
101 #if !defined(__powerpc__)
102 OF_close(kdp->d_handle);
106 if ((dp->d_handle = OF_open(dp->d_path)) == -1)
113 if (OF_seek(dp->d_handle, pos) < 0)
115 n = OF_read(dp->d_handle, buf, size);
116 if (n < 0 && n != -2)
124 ofwd_open(struct open_file *f, ...)
126 struct ofw_devdesc *dp;
130 dp = va_arg(vl, struct ofw_devdesc *);
135 OF_close(kdp->d_handle);
138 if ((dp->d_handle = OF_open(dp->d_path)) == -1) {
139 printf("%s: Could not open %s\n", __func__,
149 ofwd_close(struct open_file *f)
151 struct ofw_devdesc *dev = f->f_devdata;
154 #if !defined(__powerpc__)
155 OF_close(dev->d_handle);
163 ofwd_ioctl(struct open_file *f, u_long cmd, void *data)
165 struct ofw_devdesc *dev = f->f_devdata;
170 case DIOCGSECTORSIZE:
171 block_size = OF_block_size(dev->d_handle);
172 *(u_int *)data = block_size;
175 block_size = OF_block_size(dev->d_handle);
176 n = OF_blocks(dev->d_handle);
177 *(uint64_t *)data = (uint64_t)(n * block_size);
186 ofwd_print(int verbose __unused)
188 uintmax_t block_size, n;
193 * We don't have a list of devices since we don't parse the whole OFW
194 * tree to find them. Instead, if we have an open device print info
195 * about it. Otherwise say we can't. Makes lsdev nicer.
197 if ((ret = pager_output("block devices:\n")) != 0)
200 block_size = OF_block_size(kdp->d_handle);
201 n = OF_blocks(kdp->d_handle);
202 snprintf(line, sizeof(line),
203 " %s: OFW block device (%ju X %ju): %ju bytes\n",
204 kdp->d_path, n, block_size, n * block_size);
205 if ((ret = pager_output(line)) != 0)
208 if ((ret = pager_output(" none are open, so no info\n")) != 0)
217 ofwd_match(struct devsw *devsw, const char *devspec)
221 return (ofw_path_to_handle(devspec, devsw->dv_name, &path) != -1);
225 ofwd_fmtdev(struct devdesc *idev)
227 struct ofw_devdesc *dev = (struct ofw_devdesc *)idev;
229 return (dev->d_path);
233 ofwd_parsedev(struct devdesc **dev, const char *devspec, const char **path)
235 return (ofw_common_parsedev(dev, devspec, path, ofwdisk.dv_name));