1 /*
2 * Copyright (c) 2000-2020 Apple Inc. All rights reserved.
3 */
4 /*
5 * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
6 * Copyright (c) 1993 NeXT Computer, Inc.
7 *
8 * UNIX Device switch tables.
9 *
10 * HISTORY
11 *
12 * 30 July 1997 Umesh Vaishampayan ([email protected])
13 * enabled file descriptor pseudo-device.
14 * 18 June 1993 ? at NeXT
15 * Cleaned up a lot of stuff in this file.
16 */
17
18 #include <sys/param.h>
19 #include <sys/systm.h>
20 #include <sys/ioctl.h>
21 #include <sys/tty.h>
22 #include <sys/conf.h>
23
24 /* Prototypes that should be elsewhere: */
25 extern dev_t chrtoblk(dev_t dev);
26 extern int chrtoblk_set(int cdev, int bdev);
27
28 struct bdevsw bdevsw[] =
29 {
30 /*
31 * For block devices, every other block of 8 slots is reserved to Apple.
32 * The other slots are available for the user. This way we can both
33 * add new entries without running into each other. Be sure to fill in
34 * Apple's 8 reserved slots when you jump over us -- we'll do the same
35 * for you.
36 */
37
38 /* 0 - 7 are reserved to Apple */
39
40 NO_BDEVICE, /* 0 */
41 NO_BDEVICE, /* 1 */
42 NO_BDEVICE, /* 2 */
43 NO_BDEVICE, /* 3 */
44 NO_BDEVICE, /* 4 */
45 NO_BDEVICE, /* 5 */
46 NO_BDEVICE, /* 6 */
47 NO_BDEVICE, /* 7 */
48
49 /* 8 - 15 are reserved to the user */
50 NO_BDEVICE, /* 8 */
51 NO_BDEVICE, /* 9 */
52 NO_BDEVICE, /* 10 */
53 NO_BDEVICE, /* 11 */
54 NO_BDEVICE, /* 12 */
55 NO_BDEVICE, /* 13 */
56 NO_BDEVICE, /* 14 */
57 NO_BDEVICE, /* 15 */
58
59 /* 16 - 23 are reserved to Apple */
60 NO_BDEVICE, /* 16 */
61 NO_BDEVICE, /* 17 */
62 NO_BDEVICE, /* 18 */
63 NO_BDEVICE, /* 18 */
64 NO_BDEVICE, /* 20 */
65 NO_BDEVICE, /* 21 */
66 NO_BDEVICE, /* 22 */
67 NO_BDEVICE, /* 23 */
68 };
69
70 const int nblkdev = sizeof(bdevsw) / sizeof(bdevsw[0]);
71
72 extern struct tty *km_tty[];
73 extern d_open_t cnopen;
74 extern d_close_t cnclose;
75 extern d_read_t cnread;
76 extern d_write_t cnwrite;
77 extern d_ioctl_t cnioctl;
78 extern d_select_t cnselect;
79 extern d_open_t kmopen;
80 extern d_close_t kmclose;
81 extern d_read_t kmread;
82 extern d_write_t kmwrite;
83 extern d_ioctl_t kmioctl;
84 extern d_open_t sgopen;
85 extern d_close_t sgclose;
86 extern d_ioctl_t sgioctl;
87
88 #if NVOL > 0
89 extern d_open_t volopen;
90 extern d_close_t volclose;
91 extern d_ioctl_t volioctl;
92 #else
93 #define volopen eno_opcl
94 #define volclose eno_opcl
95 #define volioctl eno_ioctl
96 #endif
97
98 extern d_open_t cttyopen;
99 extern d_read_t cttyread;
100 extern d_write_t cttywrite;
101 extern d_ioctl_t cttyioctl;
102 extern d_select_t cttyselect;
103
104 extern d_read_t mmread;
105 extern d_write_t mmwrite;
106 extern d_ioctl_t mmioctl;
107 #define mmselect (select_fcn_t *)(void (*)(void))seltrue
108 #define mmmmap eno_mmap
109
110 #include <pty.h>
111 #if NPTY > 0
112 extern d_open_t ptsopen;
113 extern d_close_t ptsclose;
114 extern d_read_t ptsread;
115 extern d_write_t ptswrite;
116 extern d_select_t ptsselect;
117 extern d_stop_t ptsstop;
118 extern d_open_t ptcopen;
119 extern d_close_t ptcclose;
120 extern d_read_t ptcread;
121 extern d_write_t ptcwrite;
122 extern d_select_t ptcselect;
123 extern d_ioctl_t ptyioctl;
124 #else
125 #define ptsopen eno_opcl
126 #define ptsclose eno_opcl
127 #define ptsread eno_rdwrt
128 #define ptswrite eno_rdwrt
129 #define ptsstop nulldev
130
131 #define ptcopen eno_opcl
132 #define ptcclose eno_opcl
133 #define ptcread eno_rdwrt
134 #define ptcwrite eno_rdwrt
135 #define ptcselect eno_select
136 #define ptyioctl eno_ioctl
137 #endif
138
139 extern d_open_t logopen;
140 extern d_close_t logclose;
141 extern d_read_t logread;
142 extern d_ioctl_t logioctl;
143 extern d_select_t logselect;
144
145 extern d_open_t oslog_streamopen;
146 extern d_close_t oslog_streamclose;
147 extern d_read_t oslog_streamread;
148 extern d_ioctl_t oslog_streamioctl;
149 extern d_select_t oslog_streamselect;
150
151
152 extern d_open_t oslogopen;
153 extern d_close_t oslogclose;
154 extern d_ioctl_t oslogioctl;
155 extern d_select_t oslogselect;
156
157 #define nulldevfp (void (*)(void))&nulldev
158
159 #define nullopen (d_open_t *)nulldevfp
160 #define nullclose (d_close_t *)nulldevfp
161 #define nullread (d_read_t *)nulldevfp
162 #define nullwrite (d_write_t *)nulldevfp
163 #define nullioctl (d_ioctl_t *)nulldevfp
164 #define nullselect (d_select_t *)nulldevfp
165 #define nullstop (d_stop_t *)nulldevfp
166 #define nullreset (d_reset_t *)nulldevfp
167
168 struct cdevsw cdevsw[] = {
169 /*
170 * To add character devices to this table dynamically, use cdevsw_add.
171 */
172
173 [0] = {
174 cnopen, cnclose, cnread, cnwrite,
175 cnioctl, nullstop, nullreset, 0, cnselect,
176 eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
177 },
178 [1] = NO_CDEVICE,
179 [2] = {
180 cttyopen, nullclose, cttyread, cttywrite,
181 cttyioctl, nullstop, nullreset, 0, cttyselect,
182 eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
183 },
184 [3] = {
185 nullopen, nullclose, mmread, mmwrite,
186 mmioctl, nullstop, nullreset, 0, mmselect,
187 mmmmap, eno_strat, eno_getc, eno_putc, D_DISK
188 },
189 [PTC_MAJOR] = {
190 ptsopen, ptsclose, ptsread, ptswrite,
191 ptyioctl, ptsstop, nullreset, 0, ptsselect,
192 eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
193 },
194 [PTS_MAJOR] = {
195 ptcopen, ptcclose, ptcread, ptcwrite,
196 ptyioctl, nullstop, nullreset, 0, ptcselect,
197 eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
198 },
199 [6] = {
200 logopen, logclose, logread, eno_rdwrt,
201 logioctl, eno_stop, nullreset, 0, logselect,
202 eno_mmap, eno_strat, eno_getc, eno_putc, 0
203 },
204 [7] = {
205 oslogopen, oslogclose, eno_rdwrt, eno_rdwrt,
206 oslogioctl, eno_stop, nullreset, 0, oslogselect,
207 eno_mmap, eno_strat, eno_getc, eno_putc, 0
208 },
209 [8] = {
210 oslog_streamopen, oslog_streamclose, oslog_streamread, eno_rdwrt,
211 oslog_streamioctl, eno_stop, nullreset, 0, oslog_streamselect,
212 eno_mmap, eno_strat, eno_getc, eno_putc, 0
213 },
214 [9 ... 11] = NO_CDEVICE,
215 [12] = {
216 kmopen, kmclose, kmread, kmwrite,
217 kmioctl, nullstop, nullreset, km_tty, ttselect,
218 eno_mmap, eno_strat, eno_getc, eno_putc, 0
219 },
220 [13 ... 63] = NO_CDEVICE,
221 };
222 const int nchrdev = sizeof(cdevsw) / sizeof(cdevsw[0]);
223
224 uint64_t cdevsw_flags[sizeof(cdevsw) / sizeof(cdevsw[0])];
225
226 #include <sys/vnode.h> /* for VCHR and VBLK */
227 /*
228 * return true if a disk
229 */
230 int
isdisk(dev_t dev,int type)231 isdisk(dev_t dev, int type)
232 {
233 dev_t maj = major(dev);
234
235 switch (type) {
236 case VCHR:
237 maj = chrtoblk(dev);
238 if (maj == NODEV) {
239 break;
240 }
241 OS_FALLTHROUGH;
242 case VBLK:
243 if (bdevsw[maj].d_type == D_DISK) {
244 return 1;
245 }
246 break;
247 }
248 return 0;
249 }
250
251 static int chrtoblktab[] = {[0 ... nchrdev] = NODEV };
252
253 /*
254 * convert chr dev to blk dev
255 */
256 dev_t
chrtoblk(dev_t dev)257 chrtoblk(dev_t dev)
258 {
259 int blkmaj;
260
261 if (major(dev) >= nchrdev) {
262 return NODEV;
263 }
264 blkmaj = chrtoblktab[major(dev)];
265 if (blkmaj == NODEV) {
266 return NODEV;
267 }
268 return makedev(blkmaj, minor(dev));
269 }
270
271 int
chrtoblk_set(int cdev,int bdev)272 chrtoblk_set(int cdev, int bdev)
273 {
274 if (cdev >= nchrdev) {
275 return -1;
276 }
277 if (bdev != NODEV && bdev >= nblkdev) {
278 return -1;
279 }
280 chrtoblktab[cdev] = bdev;
281 return 0;
282 }
283