bsd/dev/i386/conf.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
  25  * Copyright (c) 1993 NeXT Computer, Inc.
  26  *
  27  * UNIX Device switch tables.
  28  *
  29  * HISTORY
  30  *
  31  * 30 July 1997 Umesh Vaishampayan (umeshv@apple.com)
  32  *      enabled file descriptor pseudo-device.
  33  * 18 June 1993 ? at NeXT
  34  *      Cleaned up a lot of stuff in this file.
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/ioctl.h>
  40 #include <sys/tty.h>
  41 #include <sys/conf.h>
  42
  43 /* Prototypes that should be elsewhere: */
  44 extern int      isdisk(dev_t dev, int type);
  45 extern dev_t    chrtoblk(dev_t dev);
  46 extern int      chrtoblk_set(int cdev, int bdev);
  47 extern int      iskmemdev(dev_t dev);
  48
  49 struct bdevsw   bdevsw[] =
  50 {
  51         /*
  52          *      For block devices, every other block of 8 slots is
  53          *      reserved to NeXT.  The other slots are available for
  54          *      the user.  This way we can both add new entries without
  55          *      running into each other.  Be sure to fill in NeXT's
  56          *      8 reserved slots when you jump over us -- we'll do the
  57          *      same for you.
  58          */
  59
  60         /* 0 - 7 are reserved to NeXT */
  61
  62         NO_BDEVICE,                                                     /* 0*/
  63         NO_BDEVICE,                                                     /* 1*/
  64         NO_BDEVICE,                                                     /* 2*/
  65         NO_BDEVICE,                                                     /* 3*/
  66         NO_BDEVICE,                                                     /* 4*/
  67         NO_BDEVICE,                                                     /* 5*/
  68         NO_BDEVICE,                                                     /* 6*/
  69         NO_BDEVICE,                                                     /* 7*/
  70
  71         /* 8 - 15 are reserved to the user */
  72         NO_BDEVICE,                                                     /* 8*/
  73         NO_BDEVICE,                                                     /* 9*/
  74         NO_BDEVICE,                                                     /*10*/
  75         NO_BDEVICE,                                                     /*11*/
  76         NO_BDEVICE,                                                     /*12*/
  77         NO_BDEVICE,                                                     /*13*/
  78         NO_BDEVICE,                                                     /*14*/
  79         NO_BDEVICE,                                                     /*15*/
  80
  81         /* 16 - 23 are reserved to NeXT */
  82         NO_BDEVICE,                                                     /*16*/
  83         NO_BDEVICE,                                                     /*17*/
  84         NO_BDEVICE,                                                     /*18*/
  85         NO_BDEVICE,                                                     /*18*/
  86         NO_BDEVICE,                                                     /*20*/
  87         NO_BDEVICE,                                                     /*21*/
  88         NO_BDEVICE,                                                     /*22*/
  89         NO_BDEVICE,                                                     /*23*/
  90 };
  91
  92 int     nblkdev = sizeof (bdevsw) / sizeof (bdevsw[0]);
  93
  94 extern struct tty *km_tty[];
  95 extern d_open_t         cnopen;
  96 extern d_close_t        cnclose;
  97 extern d_read_t         cnread;
  98 extern d_write_t        cnwrite;
  99 extern d_ioctl_t        cnioctl;
 100 extern d_select_t       cnselect;
 101 extern d_getc_t         cngetc;
 102 extern d_putc_t         cnputc;
 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_getc_t         kmgetc;
 109 extern d_putc_t         kmputc;
 110 extern d_open_t         sgopen;
 111 extern d_close_t        sgclose;
 112 extern d_ioctl_t        sgioctl;
 113
 114 #if NVOL > 0
 115 extern d_open_t         volopen;
 116 extern d_close_t        volclose;
 117 extern d_ioctl_t        volioctl;
 118 #else
 119 #define volopen         eno_opcl
 120 #define volclose        eno_opcl
 121 #define volioctl        eno_ioctl
 122 #endif
 123
 124 extern d_open_t         cttyopen;
 125 extern d_read_t         cttyread;
 126 extern d_write_t        cttywrite;
 127 extern d_ioctl_t        cttyioctl;
 128 extern d_select_t       cttyselect;
 129
 130 extern d_read_t         mmread;
 131 extern d_write_t        mmwrite;
 132 extern d_ioctl_t        mmioctl;
 133 #define mmselect        (select_fcn_t *)seltrue
 134 #define mmmmap          eno_mmap
 135
 136 #include <pty.h>
 137 #if NPTY > 0
 138 extern struct tty *pt_tty[];
 139 extern d_open_t         ptsopen;
 140 extern d_close_t        ptsclose;
 141 extern d_read_t         ptsread;
 142 extern d_write_t        ptswrite;
 143 extern d_stop_t         ptsstop;
 144 extern d_putc_t         ptsputc;
 145 extern d_open_t         ptcopen;
 146 extern d_close_t        ptcclose;
 147 extern d_read_t         ptcread;
 148 extern d_write_t        ptcwrite;
 149 extern d_select_t       ptcselect;
 150 extern d_ioctl_t        ptyioctl;
 151 #else
 152 #define ptsopen         eno_opcl
 153 #define ptsclose        eno_opcl
 154 #define ptsread         eno_rdwrt
 155 #define ptswrite        eno_rdwrt
 156 #define ptsstop         nulldev
 157 #define ptsputc         nulldev
 158
 159 #define ptcopen         eno_opcl
 160 #define ptcclose        eno_opcl
 161 #define ptcread         eno_rdwrt
 162 #define ptcwrite        eno_rdwrt
 163 #define ptcselect       eno_select
 164 #define ptyioctl        eno_ioctl
 165 #endif
 166
 167 extern d_open_t         logopen;
 168 extern d_close_t        logclose;
 169 extern d_read_t         logread;
 170 extern d_ioctl_t        logioctl;
 171 extern d_select_t       logselect;
 172 extern d_open_t         fdesc_open;
 173 extern d_read_t         fdesc_read;
 174 extern d_write_t        fdesc_write;
 175 extern d_ioctl_t        fdesc_ioctl;
 176 extern d_select_t       fdesc_select;
 177
 178 #define nullopen        (d_open_t *)&nulldev
 179 #define nullclose       (d_close_t *)&nulldev
 180 #define nullread        (d_read_t *)&nulldev
 181 #define nullwrite       (d_write_t *)&nulldev
 182 #define nullioctl       (d_ioctl_t *)&nulldev
 183 #define nullselect      (d_select_t *)&nulldev
 184 #define nullstop        (d_stop_t *)&nulldev
 185 #define nullreset       (d_reset_t *)&nulldev
 186
 187 struct cdevsw   cdevsw[] =
 188 {
 189         /*
 190          *      For character devices, every other block of 16 slots is
 191          *      reserved to NeXT.  The other slots are available for
 192          *      the user.  This way we can both add new entries without
 193          *      running into each other.  Be sure to fill in NeXT's
 194          *      16 reserved slots when you jump over us -- we'll do the
 195          *      same for you.
 196          */
 197
 198         /* 0 - 15 are reserved to NeXT */
 199
 200     {
 201         cnopen,         cnclose,        cnread,         cnwrite,        /* 0*/
 202         cnioctl,        nullstop,       nullreset,      0,              cnselect,
 203         eno_mmap,       eno_strat,      cngetc,         cnputc,         D_TTY
 204     },
 205     NO_CDEVICE,                                                         /* 1*/
 206     {
 207         cttyopen,       nullclose,      cttyread,       cttywrite,      /* 2*/
 208         cttyioctl,      nullstop,       nullreset,      0,              cttyselect,
 209         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 210     },
 211     {
 212         nullopen,       nullclose,      mmread,         mmwrite,        /* 3*/
 213         mmioctl,        nullstop,       nullreset,      0,              mmselect,
 214         mmmmap,         eno_strat,      eno_getc,       eno_putc,       D_DISK
 215     },
 216     {
 217         ptsopen,        ptsclose,       ptsread,        ptswrite,       /* 4*/
 218         ptyioctl,       ptsstop,        nullreset,      pt_tty,         ttselect,
 219         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 220     },
 221     {
 222         ptcopen,        ptcclose,       ptcread,        ptcwrite,       /* 5*/
 223         ptyioctl,       nullstop,       nullreset,      0,              ptcselect,
 224         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 225     },
 226     {
 227         logopen,        logclose,       logread,        eno_rdwrt,      /* 6*/
 228         logioctl,       eno_stop,       nullreset,      0,              logselect,
 229         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 230     },
 231     NO_CDEVICE,                                                         /* 7*/
 232     NO_CDEVICE,                                                         /* 8*/
 233     NO_CDEVICE,                                                         /* 9*/
 234     NO_CDEVICE,                                                         /*10*/
 235     NO_CDEVICE,                                                         /*11*/
 236     {
 237         kmopen,         kmclose,        kmread,         kmwrite,        /*12*/
 238         kmioctl,        nullstop,       nullreset,      km_tty,         ttselect,
 239         eno_mmap,       eno_strat,      kmgetc,         kmputc,         0
 240     },
 241     NO_CDEVICE,                                                         /*13*/
 242     NO_CDEVICE,                                                         /*14*/
 243     NO_CDEVICE,                                                         /*15*/
 244
 245         /* 16 - 31 are reserved to the user */
 246     NO_CDEVICE,                                                         /*16*/
 247     NO_CDEVICE,                                                         /*17*/
 248     NO_CDEVICE,                                                         /*18*/
 249     NO_CDEVICE,                                                         /*19*/
 250     NO_CDEVICE,                                                         /*20*/
 251     NO_CDEVICE,                                                         /*21*/
 252     NO_CDEVICE,                                                         /*22*/
 253     NO_CDEVICE,                                                         /*23*/
 254     NO_CDEVICE,                                                         /*24*/
 255     NO_CDEVICE,                                                         /*25*/
 256     NO_CDEVICE,                                                         /*26*/
 257     NO_CDEVICE,                                                         /*27*/
 258     NO_CDEVICE,                                                         /*28*/
 259     NO_CDEVICE,                                                         /*29*/
 260     NO_CDEVICE,                                                         /*30*/
 261     NO_CDEVICE,                                                         /*31*/
 262
 263         /* 32 - 47 are reserved to NeXT */
 264     {
 265         fdesc_open,     eno_opcl,       fdesc_read,     fdesc_write,    /*32*/
 266         fdesc_ioctl,    eno_stop,       eno_reset,      0,              fdesc_select,
 267         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 268     },
 269 #if 1
 270    NO_CDEVICE,
 271 #else
 272     {
 273         sgopen,         sgclose,        eno_rdwrt,      eno_rdwrt,      /*33*/
 274         sgioctl,        eno_stop,       eno_reset,      0,              eno_select,
 275         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TAPE
 276     },
 277 #endif
 278     NO_CDEVICE,                                                         /*34*/
 279     NO_CDEVICE,                                                         /*35*/
 280     NO_CDEVICE,                                                         /*36*/
 281     NO_CDEVICE,                                                         /*37*/
 282     NO_CDEVICE,                                                         /*38*/
 283     NO_CDEVICE,                                                         /*39*/
 284     NO_CDEVICE,                                                         /*40*/
 285     NO_CDEVICE,                                                         /*41*/
 286     {
 287         volopen,        volclose,       eno_rdwrt,      eno_rdwrt,      /*42*/
 288         volioctl,       eno_stop,       eno_reset,      0,              (select_fcn_t *)seltrue,
 289         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 290     },
 291 };
 292 int     nchrdev = sizeof (cdevsw) / sizeof (cdevsw[0]);
 293
 294
 295 #include        <sys/vnode.h> /* for VCHR and VBLK */
 296 /*
 297  * return true if a disk
 298  */
 299 int
 300 isdisk(dev_t dev, int type)
 301 {
 302         dev_t   maj = major(dev);
 303
 304         switch (type) {
 305         case VCHR:
 306                 maj = chrtoblk(maj);
 307                 if (maj == NODEV) {
 308                         break;
 309                 }
 310                 /* FALL THROUGH */
 311         case VBLK:
 312                 if (bdevsw[maj].d_type == D_DISK) {
 313                         return (1);
 314                 }
 315                 break;
 316         }
 317         return(0);
 318 }
 319
 320 static int chrtoblktab[] = {
 321         /* CHR*/        /* BLK*/        /* CHR*/        /* BLK*/
 322         /*  0 */        NODEV,          /*  1 */        NODEV,
 323         /*  2 */        NODEV,          /*  3 */        NODEV,
 324         /*  4 */        NODEV,          /*  5 */        NODEV,
 325         /*  6 */        NODEV,          /*  7 */        NODEV,
 326         /*  8 */        NODEV,          /*  9 */        NODEV,
 327         /* 10 */        NODEV,          /* 11 */        NODEV,
 328         /* 12 */        NODEV,          /* 13 */        NODEV,
 329         /* 14 */        6,              /* 15 */        NODEV,
 330         /* 16 */        NODEV,          /* 17 */        NODEV,
 331         /* 18 */        NODEV,          /* 19 */        NODEV,
 332         /* 20 */        NODEV,          /* 21 */        NODEV,
 333         /* 22 */        NODEV,          /* 23 */        NODEV,
 334         /* 24 */        NODEV,          /* 25 */        NODEV,
 335         /* 26 */        NODEV,          /* 27 */        NODEV,
 336         /* 28 */        NODEV,          /* 29 */        NODEV,
 337         /* 30 */        NODEV,          /* 31 */        NODEV,
 338         /* 32 */        NODEV,          /* 33 */        NODEV,
 339         /* 34 */        NODEV,          /* 35 */        NODEV,
 340         /* 36 */        NODEV,          /* 37 */        NODEV,
 341         /* 38 */        NODEV,          /* 39 */        NODEV,
 342         /* 40 */        NODEV,          /* 41 */        1,
 343         /* 42 */        NODEV,          /* 43 */        NODEV,
 344         /* 44 */        NODEV,
 345 };
 346
 347 /*
 348  * convert chr dev to blk dev
 349  */
 350 dev_t
 351 chrtoblk(dev_t dev)
 352 {
 353         int blkmaj;
 354
 355         if (major(dev) >= nchrdev)
 356                 return(NODEV);
 357         blkmaj = chrtoblktab[major(dev)];
 358         if (blkmaj == NODEV)
 359                 return(NODEV);
 360         return(makedev(blkmaj, minor(dev)));
 361 }
 362
 363 int
 364 chrtoblk_set(int cdev, int bdev)
 365 {
 366         if (cdev >= nchrdev)
 367                 return (-1);
 368         if (bdev != NODEV && bdev >= nblkdev)
 369                 return (-1);
 370         chrtoblktab[cdev] = bdev;
 371         return 0;
 372 }
 373
 374 /*
 375  * Returns true if dev is /dev/mem or /dev/kmem.
 376  */
 377 int iskmemdev(dev_t dev)
 378 {
 379         return (major(dev) == 3 && minor(dev) < 2);
 380 }