bsd/dev/i386/conf.c

   1 /*
   2  * Copyright (c) 2000 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) 1997 by Apple Computer, Inc., all rights reserved
  30  * Copyright (c) 1993 NeXT Computer, Inc.
  31  *
  32  * UNIX Device switch tables.
  33  *
  34  * HISTORY
  35  *
  36  * 30 July 1997 Umesh Vaishampayan (umeshv@apple.com)
  37  *      enabled file descriptor pseudo-device.
  38  * 18 June 1993 ? at NeXT
  39  *      Cleaned up a lot of stuff in this file.
  40  */
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/ioctl.h>
  45 #include <sys/tty.h>
  46 #include <sys/conf.h>
  47
  48 /* Prototypes that should be elsewhere: */
  49 extern int      isdisk(dev_t dev, int type);
  50 extern dev_t    chrtoblk(dev_t dev);
  51 extern int      chrtoblk_set(int cdev, int bdev);
  52 extern int      iskmemdev(dev_t dev);
  53
  54 struct bdevsw   bdevsw[] =
  55 {
  56         /*
  57          *      For block devices, every other block of 8 slots is
  58          *      reserved to NeXT.  The other slots are available for
  59          *      the user.  This way we can both add new entries without
  60          *      running into each other.  Be sure to fill in NeXT's
  61          *      8 reserved slots when you jump over us -- we'll do the
  62          *      same for you.
  63          */
  64
  65         /* 0 - 7 are reserved to NeXT */
  66
  67         NO_BDEVICE,                                                     /* 0*/
  68         NO_BDEVICE,                                                     /* 1*/
  69         NO_BDEVICE,                                                     /* 2*/
  70         NO_BDEVICE,                                                     /* 3*/
  71         NO_BDEVICE,                                                     /* 4*/
  72         NO_BDEVICE,                                                     /* 5*/
  73         NO_BDEVICE,                                                     /* 6*/
  74         NO_BDEVICE,                                                     /* 7*/
  75
  76         /* 8 - 15 are reserved to the user */
  77         NO_BDEVICE,                                                     /* 8*/
  78         NO_BDEVICE,                                                     /* 9*/
  79         NO_BDEVICE,                                                     /*10*/
  80         NO_BDEVICE,                                                     /*11*/
  81         NO_BDEVICE,                                                     /*12*/
  82         NO_BDEVICE,                                                     /*13*/
  83         NO_BDEVICE,                                                     /*14*/
  84         NO_BDEVICE,                                                     /*15*/
  85
  86         /* 16 - 23 are reserved to NeXT */
  87         NO_BDEVICE,                                                     /*16*/
  88         NO_BDEVICE,                                                     /*17*/
  89         NO_BDEVICE,                                                     /*18*/
  90         NO_BDEVICE,                                                     /*18*/
  91         NO_BDEVICE,                                                     /*20*/
  92         NO_BDEVICE,                                                     /*21*/
  93         NO_BDEVICE,                                                     /*22*/
  94         NO_BDEVICE,                                                     /*23*/
  95 };
  96
  97 int     nblkdev = sizeof (bdevsw) / sizeof (bdevsw[0]);
  98
  99 extern struct tty *km_tty[];
 100 extern d_open_t         cnopen;
 101 extern d_close_t        cnclose;
 102 extern d_read_t         cnread;
 103 extern d_write_t        cnwrite;
 104 extern d_ioctl_t        cnioctl;
 105 extern d_select_t       cnselect;
 106 extern d_getc_t         cngetc;
 107 extern d_putc_t         cnputc;
 108 extern d_open_t         kmopen;
 109 extern d_close_t        kmclose;
 110 extern d_read_t         kmread;
 111 extern d_write_t        kmwrite;
 112 extern d_ioctl_t        kmioctl;
 113 extern d_getc_t         kmgetc;
 114 extern d_putc_t         kmputc;
 115 extern d_open_t         sgopen;
 116 extern d_close_t        sgclose;
 117 extern d_ioctl_t        sgioctl;
 118
 119 #if NVOL > 0
 120 extern d_open_t         volopen;
 121 extern d_close_t        volclose;
 122 extern d_ioctl_t        volioctl;
 123 #else
 124 #define volopen         eno_opcl
 125 #define volclose        eno_opcl
 126 #define volioctl        eno_ioctl
 127 #endif
 128
 129 extern d_open_t         cttyopen;
 130 extern d_read_t         cttyread;
 131 extern d_write_t        cttywrite;
 132 extern d_ioctl_t        cttyioctl;
 133 extern d_select_t       cttyselect;
 134
 135 extern d_read_t         mmread;
 136 extern d_write_t        mmwrite;
 137 extern d_ioctl_t        mmioctl;
 138 #define mmselect        (select_fcn_t *)seltrue
 139 #define mmmmap          eno_mmap
 140
 141 #include <pty.h>
 142 #if NPTY > 0
 143 extern struct tty *pt_tty[];
 144 extern d_open_t         ptsopen;
 145 extern d_close_t        ptsclose;
 146 extern d_read_t         ptsread;
 147 extern d_write_t        ptswrite;
 148 extern d_stop_t         ptsstop;
 149 extern d_putc_t         ptsputc;
 150 extern d_open_t         ptcopen;
 151 extern d_close_t        ptcclose;
 152 extern d_read_t         ptcread;
 153 extern d_write_t        ptcwrite;
 154 extern d_select_t       ptcselect;
 155 extern d_ioctl_t        ptyioctl;
 156 #else
 157 #define ptsopen         eno_opcl
 158 #define ptsclose        eno_opcl
 159 #define ptsread         eno_rdwrt
 160 #define ptswrite        eno_rdwrt
 161 #define ptsstop         nulldev
 162 #define ptsputc         nulldev
 163
 164 #define ptcopen         eno_opcl
 165 #define ptcclose        eno_opcl
 166 #define ptcread         eno_rdwrt
 167 #define ptcwrite        eno_rdwrt
 168 #define ptcselect       eno_select
 169 #define ptyioctl        eno_ioctl
 170 #endif
 171
 172 extern d_open_t         logopen;
 173 extern d_close_t        logclose;
 174 extern d_read_t         logread;
 175 extern d_ioctl_t        logioctl;
 176 extern d_select_t       logselect;
 177 extern d_open_t         fdesc_open;
 178 extern d_read_t         fdesc_read;
 179 extern d_write_t        fdesc_write;
 180 extern d_ioctl_t        fdesc_ioctl;
 181 extern d_select_t       fdesc_select;
 182
 183 #define nullopen        (d_open_t *)&nulldev
 184 #define nullclose       (d_close_t *)&nulldev
 185 #define nullread        (d_read_t *)&nulldev
 186 #define nullwrite       (d_write_t *)&nulldev
 187 #define nullioctl       (d_ioctl_t *)&nulldev
 188 #define nullselect      (d_select_t *)&nulldev
 189 #define nullstop        (d_stop_t *)&nulldev
 190 #define nullreset       (d_reset_t *)&nulldev
 191
 192 struct cdevsw   cdevsw[] =
 193 {
 194         /*
 195          *      For character devices, every other block of 16 slots is
 196          *      reserved to NeXT.  The other slots are available for
 197          *      the user.  This way we can both add new entries without
 198          *      running into each other.  Be sure to fill in NeXT's
 199          *      16 reserved slots when you jump over us -- we'll do the
 200          *      same for you.
 201          */
 202
 203         /* 0 - 15 are reserved to NeXT */
 204
 205     {
 206         cnopen,         cnclose,        cnread,         cnwrite,        /* 0*/
 207         cnioctl,        nullstop,       nullreset,      0,              cnselect,
 208         eno_mmap,       eno_strat,      cngetc,         cnputc,         D_TTY
 209     },
 210     NO_CDEVICE,                                                         /* 1*/
 211     {
 212         cttyopen,       nullclose,      cttyread,       cttywrite,      /* 2*/
 213         cttyioctl,      nullstop,       nullreset,      0,              cttyselect,
 214         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 215     },
 216     {
 217         nullopen,       nullclose,      mmread,         mmwrite,        /* 3*/
 218         mmioctl,        nullstop,       nullreset,      0,              mmselect,
 219         mmmmap,         eno_strat,      eno_getc,       eno_putc,       D_DISK
 220     },
 221     {
 222         ptsopen,        ptsclose,       ptsread,        ptswrite,       /* 4*/
 223         ptyioctl,       ptsstop,        nullreset,      pt_tty,         ttselect,
 224         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 225     },
 226     {
 227         ptcopen,        ptcclose,       ptcread,        ptcwrite,       /* 5*/
 228         ptyioctl,       nullstop,       nullreset,      0,              ptcselect,
 229         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 230     },
 231     {
 232         logopen,        logclose,       logread,        eno_rdwrt,      /* 6*/
 233         logioctl,       eno_stop,       nullreset,      0,              logselect,
 234         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 235     },
 236     NO_CDEVICE,                                                         /* 7*/
 237     NO_CDEVICE,                                                         /* 8*/
 238     NO_CDEVICE,                                                         /* 9*/
 239     NO_CDEVICE,                                                         /*10*/
 240     NO_CDEVICE,                                                         /*11*/
 241     {
 242         kmopen,         kmclose,        kmread,         kmwrite,        /*12*/
 243         kmioctl,        nullstop,       nullreset,      km_tty,         ttselect,
 244         eno_mmap,       eno_strat,      kmgetc,         kmputc,         0
 245     },
 246     NO_CDEVICE,                                                         /*13*/
 247     NO_CDEVICE,                                                         /*14*/
 248     NO_CDEVICE,                                                         /*15*/
 249
 250         /* 16 - 31 are reserved to the user */
 251     NO_CDEVICE,                                                         /*16*/
 252     NO_CDEVICE,                                                         /*17*/
 253     NO_CDEVICE,                                                         /*18*/
 254     NO_CDEVICE,                                                         /*19*/
 255     NO_CDEVICE,                                                         /*20*/
 256     NO_CDEVICE,                                                         /*21*/
 257     NO_CDEVICE,                                                         /*22*/
 258     NO_CDEVICE,                                                         /*23*/
 259     NO_CDEVICE,                                                         /*24*/
 260     NO_CDEVICE,                                                         /*25*/
 261     NO_CDEVICE,                                                         /*26*/
 262     NO_CDEVICE,                                                         /*27*/
 263     NO_CDEVICE,                                                         /*28*/
 264     NO_CDEVICE,                                                         /*29*/
 265     NO_CDEVICE,                                                         /*30*/
 266     NO_CDEVICE,                                                         /*31*/
 267
 268         /* 32 - 47 are reserved to NeXT */
 269     {
 270         fdesc_open,     eno_opcl,       fdesc_read,     fdesc_write,    /*32*/
 271         fdesc_ioctl,    eno_stop,       eno_reset,      0,              fdesc_select,
 272         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 273     },
 274 #if 1
 275    NO_CDEVICE,
 276 #else
 277     {
 278         sgopen,         sgclose,        eno_rdwrt,      eno_rdwrt,      /*33*/
 279         sgioctl,        eno_stop,       eno_reset,      0,              eno_select,
 280         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TAPE
 281     },
 282 #endif
 283     NO_CDEVICE,                                                         /*34*/
 284     NO_CDEVICE,                                                         /*35*/
 285     NO_CDEVICE,                                                         /*36*/
 286     NO_CDEVICE,                                                         /*37*/
 287     NO_CDEVICE,                                                         /*38*/
 288     NO_CDEVICE,                                                         /*39*/
 289     NO_CDEVICE,                                                         /*40*/
 290     NO_CDEVICE,                                                         /*41*/
 291     {
 292         volopen,        volclose,       eno_rdwrt,      eno_rdwrt,      /*42*/
 293         volioctl,       eno_stop,       eno_reset,      0,              (select_fcn_t *)seltrue,
 294         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 295     },
 296 };
 297 int     nchrdev = sizeof (cdevsw) / sizeof (cdevsw[0]);
 298
 299
 300 #include        <sys/vnode.h> /* for VCHR and VBLK */
 301 /*
 302  * return true if a disk
 303  */
 304 int
 305 isdisk(dev_t dev, int type)
 306 {
 307         dev_t   maj = major(dev);
 308
 309         switch (type) {
 310         case VCHR:
 311                 maj = chrtoblk(maj);
 312                 if (maj == NODEV) {
 313                         break;
 314                 }
 315                 /* FALL THROUGH */
 316         case VBLK:
 317                 if (bdevsw[maj].d_type == D_DISK) {
 318                         return (1);
 319                 }
 320                 break;
 321         }
 322         return(0);
 323 }
 324
 325 static int chrtoblktab[] = {
 326         /* CHR*/        /* BLK*/        /* CHR*/        /* BLK*/
 327         /*  0 */        NODEV,          /*  1 */        NODEV,
 328         /*  2 */        NODEV,          /*  3 */        NODEV,
 329         /*  4 */        NODEV,          /*  5 */        NODEV,
 330         /*  6 */        NODEV,          /*  7 */        NODEV,
 331         /*  8 */        NODEV,          /*  9 */        NODEV,
 332         /* 10 */        NODEV,          /* 11 */        NODEV,
 333         /* 12 */        NODEV,          /* 13 */        NODEV,
 334         /* 14 */        6,              /* 15 */        NODEV,
 335         /* 16 */        NODEV,          /* 17 */        NODEV,
 336         /* 18 */        NODEV,          /* 19 */        NODEV,
 337         /* 20 */        NODEV,          /* 21 */        NODEV,
 338         /* 22 */        NODEV,          /* 23 */        NODEV,
 339         /* 24 */        NODEV,          /* 25 */        NODEV,
 340         /* 26 */        NODEV,          /* 27 */        NODEV,
 341         /* 28 */        NODEV,          /* 29 */        NODEV,
 342         /* 30 */        NODEV,          /* 31 */        NODEV,
 343         /* 32 */        NODEV,          /* 33 */        NODEV,
 344         /* 34 */        NODEV,          /* 35 */        NODEV,
 345         /* 36 */        NODEV,          /* 37 */        NODEV,
 346         /* 38 */        NODEV,          /* 39 */        NODEV,
 347         /* 40 */        NODEV,          /* 41 */        1,
 348         /* 42 */        NODEV,          /* 43 */        NODEV,
 349         /* 44 */        NODEV,
 350 };
 351
 352 /*
 353  * convert chr dev to blk dev
 354  */
 355 dev_t
 356 chrtoblk(dev_t dev)
 357 {
 358         int blkmaj;
 359
 360         if (major(dev) >= nchrdev)
 361                 return(NODEV);
 362         blkmaj = chrtoblktab[major(dev)];
 363         if (blkmaj == NODEV)
 364                 return(NODEV);
 365         return(makedev(blkmaj, minor(dev)));
 366 }
 367
 368 int
 369 chrtoblk_set(int cdev, int bdev)
 370 {
 371         if (cdev >= nchrdev)
 372                 return (-1);
 373         if (bdev != NODEV && bdev >= nblkdev)
 374                 return (-1);
 375         chrtoblktab[cdev] = bdev;
 376         return 0;
 377 }
 378
 379 /*
 380  * Returns true if dev is /dev/mem or /dev/kmem.
 381  */
 382 int iskmemdev(dev_t dev)
 383 {
 384         return (major(dev) == 3 && minor(dev) < 2);
 385 }