bsd/dev/i386/conf.c

   1 /*
   2  * Copyright (c) 1997-2006 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 int      isdisk(dev_t dev, int type);
  49 extern dev_t    chrtoblk(dev_t dev);
  50 extern int      chrtoblk_set(int cdev, int bdev);
  51 extern int      iskmemdev(dev_t dev);
  52
  53 struct bdevsw   bdevsw[] =
  54 {
  55         /*
  56          *      For block devices, every other block of 8 slots is
  57          *      reserved for Apple.  The other slots are available for
  58          *      the user.  This way we can both add new entries without
  59          *      running into each other.  Be sure to fill in Apple's
  60          *      8 reserved slots when you jump over us -- we'll do the
  61          *      same for you.
  62          */
  63
  64         /* 0 - 7 are reserved for Apple */
  65
  66         NO_BDEVICE,                                                     /* 0*/
  67         NO_BDEVICE,                                                     /* 1*/
  68         NO_BDEVICE,                                                     /* 2*/
  69         NO_BDEVICE,                                                     /* 3*/
  70         NO_BDEVICE,                                                     /* 4*/
  71         NO_BDEVICE,                                                     /* 5*/
  72         NO_BDEVICE,                                                     /* 6*/
  73         NO_BDEVICE,                                                     /* 7*/
  74
  75         /* 8 - 15 are reserved to the user */
  76         NO_BDEVICE,                                                     /* 8*/
  77         NO_BDEVICE,                                                     /* 9*/
  78         NO_BDEVICE,                                                     /*10*/
  79         NO_BDEVICE,                                                     /*11*/
  80         NO_BDEVICE,                                                     /*12*/
  81         NO_BDEVICE,                                                     /*13*/
  82         NO_BDEVICE,                                                     /*14*/
  83         NO_BDEVICE,                                                     /*15*/
  84
  85         /* 16 - 23 are reserved for Apple */
  86         NO_BDEVICE,                                                     /*16*/
  87         NO_BDEVICE,                                                     /*17*/
  88         NO_BDEVICE,                                                     /*18*/
  89         NO_BDEVICE,                                                     /*18*/
  90         NO_BDEVICE,                                                     /*20*/
  91         NO_BDEVICE,                                                     /*21*/
  92         NO_BDEVICE,                                                     /*22*/
  93         NO_BDEVICE,                                                     /*23*/
  94 };
  95
  96 int     nblkdev = sizeof (bdevsw) / sizeof (bdevsw[0]);
  97
  98 extern struct tty *km_tty[];
  99 extern d_open_t         cnopen;
 100 extern d_close_t        cnclose;
 101 extern d_read_t         cnread;
 102 extern d_write_t        cnwrite;
 103 extern d_ioctl_t        cnioctl;
 104 extern d_select_t       cnselect;
 105 extern d_getc_t         cngetc;
 106 extern d_putc_t         cnputc;
 107 extern d_open_t         kmopen;
 108 extern d_close_t        kmclose;
 109 extern d_read_t         kmread;
 110 extern d_write_t        kmwrite;
 111 extern d_ioctl_t        kmioctl;
 112 extern d_getc_t         kmgetc;
 113 extern d_putc_t         kmputc;
 114 extern d_open_t         sgopen;
 115 extern d_close_t        sgclose;
 116 extern d_ioctl_t        sgioctl;
 117
 118 #if NVOL > 0
 119 extern d_open_t         volopen;
 120 extern d_close_t        volclose;
 121 extern d_ioctl_t        volioctl;
 122 #else
 123 #define volopen         eno_opcl
 124 #define volclose        eno_opcl
 125 #define volioctl        eno_ioctl
 126 #endif
 127
 128 extern d_open_t         cttyopen;
 129 extern d_read_t         cttyread;
 130 extern d_write_t        cttywrite;
 131 extern d_ioctl_t        cttyioctl;
 132 extern d_select_t       cttyselect;
 133
 134 extern d_read_t         mmread;
 135 extern d_write_t        mmwrite;
 136 extern d_ioctl_t        mmioctl;
 137 #define mmselect        (select_fcn_t *)seltrue
 138 #define mmmmap          eno_mmap
 139
 140 #include <pty.h>
 141 #if NPTY > 0
 142 extern struct tty *pt_tty[];
 143 extern d_open_t         ptsopen;
 144 extern d_close_t        ptsclose;
 145 extern d_read_t         ptsread;
 146 extern d_write_t        ptswrite;
 147 extern d_stop_t         ptsstop;
 148 extern d_putc_t         ptsputc;
 149 extern d_open_t         ptcopen;
 150 extern d_close_t        ptcclose;
 151 extern d_read_t         ptcread;
 152 extern d_write_t        ptcwrite;
 153 extern d_select_t       ptcselect;
 154 extern d_ioctl_t        ptyioctl;
 155 #else
 156 #define ptsopen         eno_opcl
 157 #define ptsclose        eno_opcl
 158 #define ptsread         eno_rdwrt
 159 #define ptswrite        eno_rdwrt
 160 #define ptsstop         nulldev
 161 #define ptsputc         nulldev
 162
 163 #define ptcopen         eno_opcl
 164 #define ptcclose        eno_opcl
 165 #define ptcread         eno_rdwrt
 166 #define ptcwrite        eno_rdwrt
 167 #define ptcselect       eno_select
 168 #define ptyioctl        eno_ioctl
 169 #endif
 170
 171 extern d_open_t         logopen;
 172 extern d_close_t        logclose;
 173 extern d_read_t         logread;
 174 extern d_ioctl_t        logioctl;
 175 extern d_select_t       logselect;
 176 extern d_open_t         fdesc_open;
 177 extern d_read_t         fdesc_read;
 178 extern d_write_t        fdesc_write;
 179 extern d_ioctl_t        fdesc_ioctl;
 180 extern d_select_t       fdesc_select;
 181
 182 #define nullopen        (d_open_t *)&nulldev
 183 #define nullclose       (d_close_t *)&nulldev
 184 #define nullread        (d_read_t *)&nulldev
 185 #define nullwrite       (d_write_t *)&nulldev
 186 #define nullioctl       (d_ioctl_t *)&nulldev
 187 #define nullselect      (d_select_t *)&nulldev
 188 #define nullstop        (d_stop_t *)&nulldev
 189 #define nullreset       (d_reset_t *)&nulldev
 190
 191 struct cdevsw   cdevsw[] =
 192 {
 193         /*
 194          *      For character devices, every other block of 16 slots is
 195          *      reserved for Apple.  The other slots are available for
 196          *      the user.  This way we can both add new entries without
 197          *      running into each other.  Be sure to fill in Apple's
 198          *      16 reserved slots when you jump over us -- we'll do the
 199          *      same for you.
 200          */
 201
 202         /* 0 - 15 are reserved for Apple */
 203
 204     {
 205         cnopen,         cnclose,        cnread,         cnwrite,        /* 0*/
 206         cnioctl,        nullstop,       nullreset,      0,              cnselect,
 207         eno_mmap,       eno_strat,      cngetc,         cnputc,         D_TTY
 208     },
 209     NO_CDEVICE,                                                         /* 1*/
 210     {
 211         cttyopen,       nullclose,      cttyread,       cttywrite,      /* 2*/
 212         cttyioctl,      nullstop,       nullreset,      0,              cttyselect,
 213         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 214     },
 215     {
 216         nullopen,       nullclose,      mmread,         mmwrite,        /* 3*/
 217         mmioctl,        nullstop,       nullreset,      0,              mmselect,
 218         mmmmap,         eno_strat,      eno_getc,       eno_putc,       D_DISK
 219     },
 220     {
 221         ptsopen,        ptsclose,       ptsread,        ptswrite,       /* 4*/
 222         ptyioctl,       ptsstop,        nullreset,      pt_tty,         ttselect,
 223         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 224     },
 225     {
 226         ptcopen,        ptcclose,       ptcread,        ptcwrite,       /* 5*/
 227         ptyioctl,       nullstop,       nullreset,      0,              ptcselect,
 228         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 229     },
 230     {
 231         logopen,        logclose,       logread,        eno_rdwrt,      /* 6*/
 232         logioctl,       eno_stop,       nullreset,      0,              logselect,
 233         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 234     },
 235     NO_CDEVICE,                                                         /* 7*/
 236     NO_CDEVICE,                                                         /* 8*/
 237     NO_CDEVICE,                                                         /* 9*/
 238     NO_CDEVICE,                                                         /*10*/
 239     NO_CDEVICE,                                                         /*11*/
 240     {
 241         kmopen,         kmclose,        kmread,         kmwrite,        /*12*/
 242         kmioctl,        nullstop,       nullreset,      km_tty,         ttselect,
 243         eno_mmap,       eno_strat,      kmgetc,         kmputc,         0
 244     },
 245     NO_CDEVICE,                                                         /*13*/
 246     NO_CDEVICE,                                                         /*14*/
 247     NO_CDEVICE,                                                         /*15*/
 248
 249         /* 16 - 31 are reserved to the user */
 250     NO_CDEVICE,                                                         /*16*/
 251     NO_CDEVICE,                                                         /*17*/
 252     NO_CDEVICE,                                                         /*18*/
 253     NO_CDEVICE,                                                         /*19*/
 254     NO_CDEVICE,                                                         /*20*/
 255     NO_CDEVICE,                                                         /*21*/
 256     NO_CDEVICE,                                                         /*22*/
 257     NO_CDEVICE,                                                         /*23*/
 258     NO_CDEVICE,                                                         /*24*/
 259     NO_CDEVICE,                                                         /*25*/
 260     NO_CDEVICE,                                                         /*26*/
 261     NO_CDEVICE,                                                         /*27*/
 262     NO_CDEVICE,                                                         /*28*/
 263     NO_CDEVICE,                                                         /*29*/
 264     NO_CDEVICE,                                                         /*30*/
 265     NO_CDEVICE,                                                         /*31*/
 266
 267         /* 32 - 47 are reserved to NeXT */
 268     {
 269         fdesc_open,     eno_opcl,       fdesc_read,     fdesc_write,    /*32*/
 270         fdesc_ioctl,    eno_stop,       eno_reset,      0,              fdesc_select,
 271         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 272     },
 273 #if 1
 274    NO_CDEVICE,
 275 #else
 276     {
 277         sgopen,         sgclose,        eno_rdwrt,      eno_rdwrt,      /*33*/
 278         sgioctl,        eno_stop,       eno_reset,      0,              eno_select,
 279         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TAPE
 280     },
 281 #endif
 282     NO_CDEVICE,                                                         /*34*/
 283     NO_CDEVICE,                                                         /*35*/
 284     NO_CDEVICE,                                                         /*36*/
 285     NO_CDEVICE,                                                         /*37*/
 286     NO_CDEVICE,                                                         /*38*/
 287     NO_CDEVICE,                                                         /*39*/
 288     NO_CDEVICE,                                                         /*40*/
 289     NO_CDEVICE,                                                         /*41*/
 290     {
 291         volopen,        volclose,       eno_rdwrt,      eno_rdwrt,      /*42*/
 292         volioctl,       eno_stop,       eno_reset,      0,              (select_fcn_t *)seltrue,
 293         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 294     },
 295 };
 296 int     nchrdev = sizeof (cdevsw) / sizeof (cdevsw[0]);
 297
 298
 299 #include        <sys/vnode.h> /* for VCHR and VBLK */
 300 /*
 301  * return true if a disk
 302  */
 303 int
 304 isdisk(dev_t dev, int type)
 305 {
 306         dev_t   maj = major(dev);
 307
 308         switch (type) {
 309         case VCHR:
 310                 maj = chrtoblk(maj);
 311                 if (maj == NODEV) {
 312                         break;
 313                 }
 314                 /* FALL THROUGH */
 315         case VBLK:
 316                 if (bdevsw[maj].d_type == D_DISK) {
 317                         return (1);
 318                 }
 319                 break;
 320         }
 321         return(0);
 322 }
 323
 324 static int chrtoblktab[] = {
 325         /* CHR*/        /* BLK*/        /* CHR*/        /* BLK*/
 326         /*  0 */        NODEV,          /*  1 */        NODEV,
 327         /*  2 */        NODEV,          /*  3 */        NODEV,
 328         /*  4 */        NODEV,          /*  5 */        NODEV,
 329         /*  6 */        NODEV,          /*  7 */        NODEV,
 330         /*  8 */        NODEV,          /*  9 */        NODEV,
 331         /* 10 */        NODEV,          /* 11 */        NODEV,
 332         /* 12 */        NODEV,          /* 13 */        NODEV,
 333         /* 14 */        6,              /* 15 */        NODEV,
 334         /* 16 */        NODEV,          /* 17 */        NODEV,
 335         /* 18 */        NODEV,          /* 19 */        NODEV,
 336         /* 20 */        NODEV,          /* 21 */        NODEV,
 337         /* 22 */        NODEV,          /* 23 */        NODEV,
 338         /* 24 */        NODEV,          /* 25 */        NODEV,
 339         /* 26 */        NODEV,          /* 27 */        NODEV,
 340         /* 28 */        NODEV,          /* 29 */        NODEV,
 341         /* 30 */        NODEV,          /* 31 */        NODEV,
 342         /* 32 */        NODEV,          /* 33 */        NODEV,
 343         /* 34 */        NODEV,          /* 35 */        NODEV,
 344         /* 36 */        NODEV,          /* 37 */        NODEV,
 345         /* 38 */        NODEV,          /* 39 */        NODEV,
 346         /* 40 */        NODEV,          /* 41 */        1,
 347         /* 42 */        NODEV,          /* 43 */        NODEV,
 348         /* 44 */        NODEV,
 349 };
 350
 351 /*
 352  * convert chr dev to blk dev
 353  */
 354 dev_t
 355 chrtoblk(dev_t dev)
 356 {
 357         int blkmaj;
 358
 359         if (major(dev) >= nchrdev)
 360                 return(NODEV);
 361         blkmaj = chrtoblktab[major(dev)];
 362         if (blkmaj == NODEV)
 363                 return(NODEV);
 364         return(makedev(blkmaj, minor(dev)));
 365 }
 366
 367 int
 368 chrtoblk_set(int cdev, int bdev)
 369 {
 370         if (cdev >= nchrdev)
 371                 return (-1);
 372         if (bdev != NODEV && bdev >= nblkdev)
 373                 return (-1);
 374         chrtoblktab[cdev] = bdev;
 375         return 0;
 376 }
 377
 378 /*
 379  * Returns true if dev is /dev/mem or /dev/kmem.
 380  */
 381 int iskmemdev(dev_t dev)
 382 {
 383         return (major(dev) == 3 && minor(dev) < 2);
 384 }