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 dev_t    chrtoblk(dev_t dev);
  49 extern int      chrtoblk_set(int cdev, int bdev);
  50 extern int      iskmemdev(dev_t dev);
  51
  52 struct bdevsw   bdevsw[] =
  53 {
  54         /*
  55          *      For block devices, every other block of 8 slots is
  56          *      reserved for Apple.  The other slots are available for
  57          *      the user.  This way we can both add new entries without
  58          *      running into each other.  Be sure to fill in Apple's
  59          *      8 reserved slots when you jump over us -- we'll do the
  60          *      same for you.
  61          */
  62
  63         /* 0 - 7 are reserved for Apple */
  64
  65         NO_BDEVICE,                                                     /* 0*/
  66         NO_BDEVICE,                                                     /* 1*/
  67         NO_BDEVICE,                                                     /* 2*/
  68         NO_BDEVICE,                                                     /* 3*/
  69         NO_BDEVICE,                                                     /* 4*/
  70         NO_BDEVICE,                                                     /* 5*/
  71         NO_BDEVICE,                                                     /* 6*/
  72         NO_BDEVICE,                                                     /* 7*/
  73
  74         /* 8 - 15 are reserved to the user */
  75         NO_BDEVICE,                                                     /* 8*/
  76         NO_BDEVICE,                                                     /* 9*/
  77         NO_BDEVICE,                                                     /*10*/
  78         NO_BDEVICE,                                                     /*11*/
  79         NO_BDEVICE,                                                     /*12*/
  80         NO_BDEVICE,                                                     /*13*/
  81         NO_BDEVICE,                                                     /*14*/
  82         NO_BDEVICE,                                                     /*15*/
  83
  84         /* 16 - 23 are reserved for Apple */
  85         NO_BDEVICE,                                                     /*16*/
  86         NO_BDEVICE,                                                     /*17*/
  87         NO_BDEVICE,                                                     /*18*/
  88         NO_BDEVICE,                                                     /*18*/
  89         NO_BDEVICE,                                                     /*20*/
  90         NO_BDEVICE,                                                     /*21*/
  91         NO_BDEVICE,                                                     /*22*/
  92         NO_BDEVICE,                                                     /*23*/
  93 };
  94
  95 int     nblkdev = sizeof (bdevsw) / sizeof (bdevsw[0]);
  96
  97 extern struct tty *km_tty[];
  98 extern d_open_t         cnopen;
  99 extern d_close_t        cnclose;
 100 extern d_read_t         cnread;
 101 extern d_write_t        cnwrite;
 102 extern d_ioctl_t        cnioctl;
 103 extern d_select_t       cnselect;
 104 extern d_open_t         kmopen;
 105 extern d_close_t        kmclose;
 106 extern d_read_t         kmread;
 107 extern d_write_t        kmwrite;
 108 extern d_ioctl_t        kmioctl;
 109 extern d_open_t         sgopen;
 110 extern d_close_t        sgclose;
 111 extern d_ioctl_t        sgioctl;
 112
 113 #if NVOL > 0
 114 extern d_open_t         volopen;
 115 extern d_close_t        volclose;
 116 extern d_ioctl_t        volioctl;
 117 #else
 118 #define volopen         eno_opcl
 119 #define volclose        eno_opcl
 120 #define volioctl        eno_ioctl
 121 #endif
 122
 123 extern d_open_t         cttyopen;
 124 extern d_read_t         cttyread;
 125 extern d_write_t        cttywrite;
 126 extern d_ioctl_t        cttyioctl;
 127 extern d_select_t       cttyselect;
 128
 129 extern d_read_t         mmread;
 130 extern d_write_t        mmwrite;
 131 extern d_ioctl_t        mmioctl;
 132 #define mmselect        (select_fcn_t *)seltrue
 133 #define mmmmap          eno_mmap
 134
 135 #include <pty.h>
 136 #if NPTY > 0
 137 extern struct tty *pt_tty[];
 138 extern d_open_t         ptsopen;
 139 extern d_close_t        ptsclose;
 140 extern d_read_t         ptsread;
 141 extern d_write_t        ptswrite;
 142 extern d_stop_t         ptsstop;
 143 extern d_open_t         ptcopen;
 144 extern d_close_t        ptcclose;
 145 extern d_read_t         ptcread;
 146 extern d_write_t        ptcwrite;
 147 extern d_select_t       ptcselect;
 148 extern d_ioctl_t        ptyioctl;
 149 #else
 150 #define ptsopen         eno_opcl
 151 #define ptsclose        eno_opcl
 152 #define ptsread         eno_rdwrt
 153 #define ptswrite        eno_rdwrt
 154 #define ptsstop         nulldev
 155
 156 #define ptcopen         eno_opcl
 157 #define ptcclose        eno_opcl
 158 #define ptcread         eno_rdwrt
 159 #define ptcwrite        eno_rdwrt
 160 #define ptcselect       eno_select
 161 #define ptyioctl        eno_ioctl
 162 #endif
 163
 164 extern d_open_t         logopen;
 165 extern d_close_t        logclose;
 166 extern d_read_t         logread;
 167 extern d_ioctl_t        logioctl;
 168 extern d_select_t       logselect;
 169 extern d_open_t         fdesc_open;
 170 extern d_read_t         fdesc_read;
 171 extern d_write_t        fdesc_write;
 172 extern d_ioctl_t        fdesc_ioctl;
 173 extern d_select_t       fdesc_select;
 174
 175 #define nullopen        (d_open_t *)&nulldev
 176 #define nullclose       (d_close_t *)&nulldev
 177 #define nullread        (d_read_t *)&nulldev
 178 #define nullwrite       (d_write_t *)&nulldev
 179 #define nullioctl       (d_ioctl_t *)&nulldev
 180 #define nullselect      (d_select_t *)&nulldev
 181 #define nullstop        (d_stop_t *)&nulldev
 182 #define nullreset       (d_reset_t *)&nulldev
 183
 184 struct cdevsw   cdevsw[] =
 185 {
 186         /*
 187          *      For character devices, every other block of 16 slots is
 188          *      reserved for Apple.  The other slots are available for
 189          *      the user.  This way we can both add new entries without
 190          *      running into each other.  Be sure to fill in Apple's
 191          *      16 reserved slots when you jump over us -- we'll do the
 192          *      same for you.
 193          */
 194
 195         /* 0 - 15 are reserved for Apple */
 196
 197     {
 198         cnopen,         cnclose,        cnread,         cnwrite,        /* 0*/
 199         cnioctl,        nullstop,       nullreset,      0,              cnselect,
 200         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 201     },
 202     NO_CDEVICE,                                                         /* 1*/
 203     {
 204         cttyopen,       nullclose,      cttyread,       cttywrite,      /* 2*/
 205         cttyioctl,      nullstop,       nullreset,      0,              cttyselect,
 206         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 207     },
 208     {
 209         nullopen,       nullclose,      mmread,         mmwrite,        /* 3*/
 210         mmioctl,        nullstop,       nullreset,      0,              mmselect,
 211         mmmmap,         eno_strat,      eno_getc,       eno_putc,       D_DISK
 212     },
 213     {
 214         ptsopen,        ptsclose,       ptsread,        ptswrite,       /* 4*/
 215         ptyioctl,       ptsstop,        nullreset,      pt_tty,         ttselect,
 216         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 217     },
 218     {
 219         ptcopen,        ptcclose,       ptcread,        ptcwrite,       /* 5*/
 220         ptyioctl,       nullstop,       nullreset,      0,              ptcselect,
 221         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TTY
 222     },
 223     {
 224         logopen,        logclose,       logread,        eno_rdwrt,      /* 6*/
 225         logioctl,       eno_stop,       nullreset,      0,              logselect,
 226         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 227     },
 228     NO_CDEVICE,                                                         /* 7*/
 229     NO_CDEVICE,                                                         /* 8*/
 230     NO_CDEVICE,                                                         /* 9*/
 231     NO_CDEVICE,                                                         /*10*/
 232     NO_CDEVICE,                                                         /*11*/
 233     {
 234         kmopen,         kmclose,        kmread,         kmwrite,        /*12*/
 235         kmioctl,        nullstop,       nullreset,      km_tty,         ttselect,
 236         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 237     },
 238     NO_CDEVICE,                                                         /*13*/
 239     NO_CDEVICE,                                                         /*14*/
 240     NO_CDEVICE,                                                         /*15*/
 241
 242         /* 16 - 31 are reserved to the user */
 243     NO_CDEVICE,                                                         /*16*/
 244     NO_CDEVICE,                                                         /*17*/
 245     NO_CDEVICE,                                                         /*18*/
 246     NO_CDEVICE,                                                         /*19*/
 247     NO_CDEVICE,                                                         /*20*/
 248     NO_CDEVICE,                                                         /*21*/
 249     NO_CDEVICE,                                                         /*22*/
 250     NO_CDEVICE,                                                         /*23*/
 251     NO_CDEVICE,                                                         /*24*/
 252     NO_CDEVICE,                                                         /*25*/
 253     NO_CDEVICE,                                                         /*26*/
 254     NO_CDEVICE,                                                         /*27*/
 255     NO_CDEVICE,                                                         /*28*/
 256     NO_CDEVICE,                                                         /*29*/
 257     NO_CDEVICE,                                                         /*30*/
 258     NO_CDEVICE,                                                         /*31*/
 259
 260         /* 32 - 47 are reserved to NeXT */
 261     {
 262         fdesc_open,     eno_opcl,       fdesc_read,     fdesc_write,    /*32*/
 263         fdesc_ioctl,    eno_stop,       eno_reset,      0,              fdesc_select,
 264         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 265     },
 266 #if 1
 267    NO_CDEVICE,
 268 #else
 269     {
 270         sgopen,         sgclose,        eno_rdwrt,      eno_rdwrt,      /*33*/
 271         sgioctl,        eno_stop,       eno_reset,      0,              eno_select,
 272         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       D_TAPE
 273     },
 274 #endif
 275     NO_CDEVICE,                                                         /*34*/
 276     NO_CDEVICE,                                                         /*35*/
 277     NO_CDEVICE,                                                         /*36*/
 278     NO_CDEVICE,                                                         /*37*/
 279     NO_CDEVICE,                                                         /*38*/
 280     NO_CDEVICE,                                                         /*39*/
 281     NO_CDEVICE,                                                         /*40*/
 282     NO_CDEVICE,                                                         /*41*/
 283     {
 284         volopen,        volclose,       eno_rdwrt,      eno_rdwrt,      /*42*/
 285         volioctl,       eno_stop,       eno_reset,      0,              (select_fcn_t *)seltrue,
 286         eno_mmap,       eno_strat,      eno_getc,       eno_putc,       0
 287     },
 288 };
 289 int     nchrdev = sizeof (cdevsw) / sizeof (cdevsw[0]);
 290
 291 uint64_t cdevsw_flags[sizeof (cdevsw) / sizeof (cdevsw[0])];
 292
 293 #include        <sys/vnode.h> /* for VCHR and VBLK */
 294 /*
 295  * return true if a disk
 296  */
 297 int
 298 isdisk(dev_t dev, int type)
 299 {
 300         dev_t   maj = major(dev);
 301
 302         switch (type) {
 303         case VCHR:
 304                 maj = chrtoblk(maj);
 305                 if (maj == NODEV) {
 306                         break;
 307                 }
 308                 /* FALL THROUGH */
 309         case VBLK:
 310                 if (bdevsw[maj].d_type == D_DISK) {
 311                         return (1);
 312                 }
 313                 break;
 314         }
 315         return(0);
 316 }
 317
 318 static int chrtoblktab[] = {
 319         /* CHR*/        /* BLK*/        /* CHR*/        /* BLK*/
 320         /*  0 */        NODEV,          /*  1 */        NODEV,
 321         /*  2 */        NODEV,          /*  3 */        NODEV,
 322         /*  4 */        NODEV,          /*  5 */        NODEV,
 323         /*  6 */        NODEV,          /*  7 */        NODEV,
 324         /*  8 */        NODEV,          /*  9 */        NODEV,
 325         /* 10 */        NODEV,          /* 11 */        NODEV,
 326         /* 12 */        NODEV,          /* 13 */        NODEV,
 327         /* 14 */        6,              /* 15 */        NODEV,
 328         /* 16 */        NODEV,          /* 17 */        NODEV,
 329         /* 18 */        NODEV,          /* 19 */        NODEV,
 330         /* 20 */        NODEV,          /* 21 */        NODEV,
 331         /* 22 */        NODEV,          /* 23 */        NODEV,
 332         /* 24 */        NODEV,          /* 25 */        NODEV,
 333         /* 26 */        NODEV,          /* 27 */        NODEV,
 334         /* 28 */        NODEV,          /* 29 */        NODEV,
 335         /* 30 */        NODEV,          /* 31 */        NODEV,
 336         /* 32 */        NODEV,          /* 33 */        NODEV,
 337         /* 34 */        NODEV,          /* 35 */        NODEV,
 338         /* 36 */        NODEV,          /* 37 */        NODEV,
 339         /* 38 */        NODEV,          /* 39 */        NODEV,
 340         /* 40 */        NODEV,          /* 41 */        1,
 341         /* 42 */        NODEV,          /* 43 */        NODEV,
 342         /* 44 */        NODEV,
 343 };
 344
 345 /*
 346  * convert chr dev to blk dev
 347  */
 348 dev_t
 349 chrtoblk(dev_t dev)
 350 {
 351         int blkmaj;
 352
 353         if (major(dev) >= nchrdev)
 354                 return(NODEV);
 355         blkmaj = chrtoblktab[major(dev)];
 356         if (blkmaj == NODEV)
 357                 return(NODEV);
 358         return(makedev(blkmaj, minor(dev)));
 359 }
 360
 361 int
 362 chrtoblk_set(int cdev, int bdev)
 363 {
 364         if (cdev >= nchrdev)
 365                 return (-1);
 366         if (bdev != NODEV && bdev >= nblkdev)
 367                 return (-1);
 368         chrtoblktab[cdev] = bdev;
 369         return 0;
 370 }
 371
 372 /*
 373  * Returns true if dev is /dev/mem or /dev/kmem.
 374  */
 375 int iskmemdev(dev_t dev)
 376 {
 377         return (major(dev) == 3 && minor(dev) < 2);
 378 }