bsd/dev/i386/conf.c

   1 /*
   2  * Copyright (c) 1997-2012 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1993 NeXT Computer, Inc.
  30  *
  31  * UNIX Device switch tables.
  32  *
  33  * HISTORY
  34  *
  35  * 30 July 1997 Umesh Vaishampayan (umeshv@apple.com)
  36  *      enabled file descriptor pseudo-device.
  37  * 18 June 1993 ? at NeXT
  38  *      Cleaned up a lot of stuff in this file.
  39  */
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/ioctl.h>
  44 #include <sys/tty.h>
  45 #include <sys/conf.h>
  46
  47 /* Prototypes that should be elsewhere: */
  48 extern dev_t    chrtoblk(dev_t dev);
  49 extern int      chrtoblk_set(int cdev, int bdev);
  50
  51 struct bdevsw   bdevsw[] =
  52 {
  53         /*
  54          *      For block devices, every other block of 8 slots is
  55          *      reserved for Apple.  The other slots are available for
  56          *      the user.  This way we can both add new entries without
  57          *      running into each other.  Be sure to fill in Apple's
  58          *      8 reserved slots when you jump over us -- we'll do the
  59          *      same for you.
  60          */
  61
  62         /* 0 - 7 are reserved for Apple */
  63
  64         NO_BDEVICE,                                                     /* 0*/
  65         NO_BDEVICE,                                                     /* 1*/
  66         NO_BDEVICE,                                                     /* 2*/
  67         NO_BDEVICE,                                                     /* 3*/
  68         NO_BDEVICE,                                                     /* 4*/
  69         NO_BDEVICE,                                                     /* 5*/
  70         NO_BDEVICE,                                                     /* 6*/
  71         NO_BDEVICE,                                                     /* 7*/
  72
  73         /* 8 - 15 are reserved to the user */
  74         NO_BDEVICE,                                                     /* 8*/
  75         NO_BDEVICE,                                                     /* 9*/
  76         NO_BDEVICE,                                                     /*10*/
  77         NO_BDEVICE,                                                     /*11*/
  78         NO_BDEVICE,                                                     /*12*/
  79         NO_BDEVICE,                                                     /*13*/
  80         NO_BDEVICE,                                                     /*14*/
  81         NO_BDEVICE,                                                     /*15*/
  82
  83         /* 16 - 23 are reserved for Apple */
  84         NO_BDEVICE,                                                     /*16*/
  85         NO_BDEVICE,                                                     /*17*/
  86         NO_BDEVICE,                                                     /*18*/
  87         NO_BDEVICE,                                                     /*18*/
  88         NO_BDEVICE,                                                     /*20*/
  89         NO_BDEVICE,                                                     /*21*/
  90         NO_BDEVICE,                                                     /*22*/
  91         NO_BDEVICE,                                                     /*23*/
  92 };
  93
  94 const int nblkdev = sizeof(bdevsw) / sizeof(bdevsw[0]);
  95
  96 extern struct tty *km_tty[];
  97 extern d_open_t         cnopen;
  98 extern d_close_t        cnclose;
  99 extern d_read_t         cnread;
 100 extern d_write_t        cnwrite;
 101 extern d_ioctl_t        cnioctl;
 102 extern d_select_t       cnselect;
 103 extern d_open_t         kmopen;
 104 extern d_close_t        kmclose;
 105 extern d_read_t         kmread;
 106 extern d_write_t        kmwrite;
 107 extern d_ioctl_t        kmioctl;
 108 extern d_open_t         sgopen;
 109 extern d_close_t        sgclose;
 110 extern d_ioctl_t        sgioctl;
 111
 112 #if NVOL > 0
 113 extern d_open_t         volopen;
 114 extern d_close_t        volclose;
 115 extern d_ioctl_t        volioctl;
 116 #else
 117 #define volopen         eno_opcl
 118 #define volclose        eno_opcl
 119 #define volioctl        eno_ioctl
 120 #endif
 121
 122 extern d_open_t         cttyopen;
 123 extern d_read_t         cttyread;
 124 extern d_write_t        cttywrite;
 125 extern d_ioctl_t        cttyioctl;
 126 extern d_select_t       cttyselect;
 127
 128 extern d_read_t         mmread;
 129 extern d_write_t        mmwrite;
 130 extern d_ioctl_t        mmioctl;
 131 #define mmselect        (select_fcn_t *)seltrue
 132 #define mmmmap          eno_mmap
 133
 134 #include <pty.h>
 135 #if NPTY > 0
 136 extern d_open_t         ptsopen;
 137 extern d_close_t        ptsclose;
 138 extern d_read_t         ptsread;
 139 extern d_write_t        ptswrite;
 140 extern d_stop_t         ptsstop;
 141 extern d_select_t       ptsselect;
 142 extern d_open_t         ptcopen;
 143 extern d_close_t        ptcclose;
 144 extern d_read_t         ptcread;
 145 extern d_write_t        ptcwrite;
 146 extern d_select_t       ptcselect;
 147 extern d_ioctl_t        ptyioctl;
 148 #else
 149 #define ptsopen         eno_opcl
 150 #define ptsclose        eno_opcl
 151 #define ptsread         eno_rdwrt
 152 #define ptswrite        eno_rdwrt
 153 #define ptsstop         nulldev
 154
 155 #define ptcopen         eno_opcl
 156 #define ptcclose        eno_opcl
 157 #define ptcread         eno_rdwrt
 158 #define ptcwrite        eno_rdwrt
 159 #define ptcselect       eno_select
 160 #define ptyioctl        eno_ioctl
 161 #endif
 162
 163 extern d_open_t         logopen;
 164 extern d_close_t        logclose;
 165 extern d_read_t         logread;
 166 extern d_ioctl_t        logioctl;
 167 extern d_select_t       logselect;
 168 extern d_open_t         fdesc_open;
 169 extern d_read_t         fdesc_read;
 170 extern d_write_t        fdesc_write;
 171 extern d_ioctl_t        fdesc_ioctl;
 172 extern d_select_t       fdesc_select;
 173
 174 extern d_open_t         oslog_streamopen;
 175 extern d_close_t        oslog_streamclose;
 176 extern d_read_t         oslog_streamread;
 177 extern d_ioctl_t        oslog_streamioctl;
 178 extern d_select_t       oslog_streamselect;
 179
 180 extern d_open_t         oslogopen;
 181 extern d_close_t        oslogclose;
 182 extern d_select_t       oslogselect;
 183 extern d_ioctl_t        oslogioctl;
 184
 185 #define nullopen        (d_open_t *)&nulldev
 186 #define nullclose       (d_close_t *)&nulldev
 187 #define nullread        (d_read_t *)&nulldev
 188 #define nullwrite       (d_write_t *)&nulldev
 189 #define nullioctl       (d_ioctl_t *)&nulldev
 190 #define nullselect      (d_select_t *)&nulldev
 191 #define nullstop        (d_stop_t *)&nulldev
 192 #define nullreset       (d_reset_t *)&nulldev
 193
 194 struct cdevsw   cdevsw[] =
 195 {
 196         /*
 197          *      For character devices, every other block of 16 slots is
 198          *      reserved for Apple.  The other slots are available for
 199          *      the user.  This way we can both add new entries without
 200          *      running into each other.  Be sure to fill in Apple's
 201          *      16 reserved slots when you jump over us -- we'll do the
 202          *      same for you.
 203          */
 204
 205         /* 0 - 15 are reserved for Apple */
 206
 207     {
 208         cnopen,         cnclose,        cnread,         cnwrite,        /* 0*/
 209         cnioctl,        nullstop,       nullreset,      0,              cnselect,
 210         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 211     },
 212     NO_CDEVICE,                                                         /* 1*/
 213     {
 214         cttyopen,       nullclose,      cttyread,       cttywrite,      /* 2*/
 215         cttyioctl,      nullstop,       nullreset,      0,              cttyselect,
 216         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 217     },
 218     {
 219         nullopen,       nullclose,      mmread,         mmwrite,        /* 3*/
 220         mmioctl,        nullstop,       nullreset,      0,              mmselect,
 221         mmmmap,         eno_strat,      eno_getc,       eno_putc,       D_DISK
 222     },
 223     {
 224         ptsopen,        ptsclose,       ptsread,        ptswrite,       /* 4*/
 225         ptyioctl,       ptsstop,        nullreset,      0,              ptsselect,
 226         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 227     },
 228     {
 229         ptcopen,        ptcclose,       ptcread,        ptcwrite,       /* 5*/
 230         ptyioctl,       nullstop,       nullreset,      0,              ptcselect,
 231         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 232     },
 233     {
 234         logopen,        logclose,       logread,        eno_rdwrt,      /* 6*/
 235         logioctl,       eno_stop,       nullreset,      0,              logselect,
 236         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 237     },
 238     {
 239         oslogopen,      oslogclose,     eno_rdwrt,      eno_rdwrt,      /* 7*/
 240         oslogioctl,     eno_stop,       nullreset,      0,              oslogselect,
 241         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 242     },
 243     {
 244         oslog_streamopen,       oslog_streamclose,      oslog_streamread,       eno_rdwrt,      /* 8*/
 245         oslog_streamioctl,      eno_stop,               nullreset,              0,              oslog_streamselect,
 246         eno_mmap,               eno_strat,              eno_getc,               eno_putc,       0
 247     },
 248     NO_CDEVICE,                                                         /* 9*/
 249     NO_CDEVICE,                                                         /*10*/
 250     NO_CDEVICE,                                                         /*11*/
 251     {
 252         kmopen,         kmclose,        kmread,         kmwrite,        /*12*/
 253         kmioctl,        nullstop,       nullreset,      km_tty,         ttselect,
 254         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 255     },
 256     NO_CDEVICE,                                                         /*13*/
 257     NO_CDEVICE,                                                         /*14*/
 258     NO_CDEVICE,                                                         /*15*/
 259
 260         /* 16 - 31 are reserved to the user */
 261     NO_CDEVICE,                                                         /*16*/
 262     NO_CDEVICE,                                                         /*17*/
 263     NO_CDEVICE,                                                         /*18*/
 264     NO_CDEVICE,                                                         /*19*/
 265     NO_CDEVICE,                                                         /*20*/
 266     NO_CDEVICE,                                                         /*21*/
 267     NO_CDEVICE,                                                         /*22*/
 268     NO_CDEVICE,                                                         /*23*/
 269     NO_CDEVICE,                                                         /*24*/
 270     NO_CDEVICE,                                                         /*25*/
 271     NO_CDEVICE,                                                         /*26*/
 272     NO_CDEVICE,                                                         /*27*/
 273     NO_CDEVICE,                                                         /*28*/
 274     NO_CDEVICE,                                                         /*29*/
 275     NO_CDEVICE,                                                         /*30*/
 276     NO_CDEVICE,                                                         /*31*/
 277
 278         /* 32 - 47 are reserved to NeXT */
 279     {
 280         fdesc_open,     eno_opcl,       fdesc_read,     fdesc_write,    /*32*/
 281         fdesc_ioctl,    eno_stop,       eno_reset,      0,              fdesc_select,
 282         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 283     },
 284 #if 1
 285    NO_CDEVICE,
 286 #else
 287     {
 288         sgopen,         sgclose,        eno_rdwrt,      eno_rdwrt,      /*33*/
 289         sgioctl,        eno_stop,       eno_reset,      0,              eno_select,
 290         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TAPE
 291     },
 292 #endif
 293     NO_CDEVICE,                                                         /*34*/
 294     NO_CDEVICE,                                                         /*35*/
 295     NO_CDEVICE,                                                         /*36*/
 296     NO_CDEVICE,                                                         /*37*/
 297     NO_CDEVICE,                                                         /*38*/
 298     NO_CDEVICE,                                                         /*39*/
 299     NO_CDEVICE,                                                         /*40*/
 300     NO_CDEVICE,                                                         /*41*/
 301     {
 302         volopen,        volclose,       eno_rdwrt,      eno_rdwrt,      /*42*/
 303         volioctl,       eno_stop,       eno_reset,      0,              (select_fcn_t *)seltrue,
 304         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 305     },
 306 };
 307 const int nchrdev = sizeof(cdevsw) / sizeof(cdevsw[0]);
 308
 309 uint64_t cdevsw_flags[sizeof(cdevsw) / sizeof(cdevsw[0])];
 310
 311 #include        <sys/vnode.h> /* for VCHR and VBLK */
 312 /*
 313  * return true if a disk
 314  */
 315 int
 316 isdisk(dev_t dev, int type)
 317 {
 318         dev_t   maj = major(dev);
 319
 320         switch (type) {
 321         case VCHR:
 322                 maj = chrtoblk(maj);
 323                 if (maj == NODEV) {
 324                         break;
 325                 }
 326                 /* FALL THROUGH */
 327         case VBLK:
 328                 if (bdevsw[maj].d_type == D_DISK) {
 329                         return (1);
 330                 }
 331                 break;
 332         }
 333         return(0);
 334 }
 335
 336 static int chrtoblktab[] = {
 337         /* CHR*/        /* BLK*/        /* CHR*/        /* BLK*/
 338         /*  0 */        NODEV,          /*  1 */        NODEV,
 339         /*  2 */        NODEV,          /*  3 */        NODEV,
 340         /*  4 */        NODEV,          /*  5 */        NODEV,
 341         /*  6 */        NODEV,          /*  7 */        NODEV,
 342         /*  8 */        NODEV,          /*  9 */        NODEV,
 343         /* 10 */        NODEV,          /* 11 */        NODEV,
 344         /* 12 */        NODEV,          /* 13 */        NODEV,
 345         /* 14 */        NODEV,          /* 15 */        NODEV,
 346         /* 16 */        NODEV,          /* 17 */        NODEV,
 347         /* 18 */        NODEV,          /* 19 */        NODEV,
 348         /* 20 */        NODEV,          /* 21 */        NODEV,
 349         /* 22 */        NODEV,          /* 23 */        NODEV,
 350         /* 24 */        NODEV,          /* 25 */        NODEV,
 351         /* 26 */        NODEV,          /* 27 */        NODEV,
 352         /* 28 */        NODEV,          /* 29 */        NODEV,
 353         /* 30 */        NODEV,          /* 31 */        NODEV,
 354         /* 32 */        NODEV,          /* 33 */        NODEV,
 355         /* 34 */        NODEV,          /* 35 */        NODEV,
 356         /* 36 */        NODEV,          /* 37 */        NODEV,
 357         /* 38 */        NODEV,          /* 39 */        NODEV,
 358         /* 40 */        NODEV,          /* 41 */        NODEV,
 359         /* 42 */        NODEV,          /* 43 */        NODEV,
 360         /* 44 */        NODEV,
 361 };
 362
 363 /*
 364  * convert chr dev to blk dev
 365  */
 366 dev_t
 367 chrtoblk(dev_t dev)
 368 {
 369         int blkmaj;
 370
 371         if (major(dev) >= nchrdev)
 372                 return(NODEV);
 373         blkmaj = chrtoblktab[major(dev)];
 374         if (blkmaj == NODEV)
 375                 return(NODEV);
 376         return(makedev(blkmaj, minor(dev)));
 377 }
 378
 379 int
 380 chrtoblk_set(int cdev, int bdev)
 381 {
 382         if (cdev >= nchrdev)
 383                 return (-1);
 384         if (bdev != NODEV && bdev >= nblkdev)
 385                 return (-1);
 386         chrtoblktab[cdev] = bdev;
 387         return 0;
 388 }
 389