The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/conf.h

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    1 /*-
    2  * Copyright (c) 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * Copyright (c) 2000
    5  *      Poul-Henning Kamp.  All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. All advertising materials mentioning features or use of this software
   21  *    must display the following acknowledgement:
   22  *      This product includes software developed by the University of
   23  *      California, Berkeley and its contributors.
   24  * 4. Neither the name of the University nor the names of its contributors
   25  *    may be used to endorse or promote products derived from this software
   26  *    without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   38  * SUCH DAMAGE.
   39  *
   40  *      @(#)conf.h      8.5 (Berkeley) 1/9/95
   41  * $FreeBSD: releng/5.2/sys/sys/conf.h 121188 2003-10-18 09:03:15Z phk $
   42  */
   43 
   44 #ifndef _SYS_CONF_H_
   45 #define _SYS_CONF_H_
   46 
   47 #ifdef _KERNEL
   48 #include <sys/eventhandler.h>
   49 
   50 struct tty;
   51 struct disk;
   52 struct vnode;
   53 struct buf;
   54 TAILQ_HEAD(snaphead, inode);
   55 
   56 struct cdev {
   57         u_int           si_flags;
   58 #define SI_STASHED      0x0001  /* created in stashed storage */
   59 #define SI_ALIAS        0x0002  /* carrier of alias name */
   60 #define SI_NAMED        0x0004  /* make_dev{_alias} has been called */
   61 #define SI_CHEAPCLONE   0x0008  /* can be removed_dev'ed when vnode reclaims */
   62 #define SI_CHILD        0x0010  /* child of another dev_t */
   63 #define SI_DEVOPEN      0x0020  /* opened by device */
   64 #define SI_CONSOPEN     0x0040  /* opened by console */
   65 #define SI_DUMPDEV      0x0080  /* is kernel dumpdev */
   66 #define SI_CANDELETE    0x0100  /* can do BIO_DELETE */
   67         struct timespec si_atime;
   68         struct timespec si_ctime;
   69         struct timespec si_mtime;
   70         udev_t          si_udev;
   71         LIST_ENTRY(cdev)        si_hash;
   72         SLIST_HEAD(, vnode)     si_hlist;
   73         LIST_HEAD(, cdev)       si_children;
   74         LIST_ENTRY(cdev)        si_siblings;
   75         dev_t           si_parent;
   76         u_int           si_inode;
   77         char            *si_name;
   78         void            *si_drv1, *si_drv2;
   79         struct cdevsw   *si_devsw;
   80         int             si_iosize_max;  /* maximum I/O size (for physio &al) */
   81         u_int           si_stripesize;
   82         u_int           si_stripeoffset;
   83         uid_t           si_uid;
   84         gid_t           si_gid;
   85         mode_t          si_mode;
   86         u_long          si_usecount;
   87         union {
   88                 struct {
   89                         struct tty *__sit_tty;
   90                 } __si_tty;
   91                 struct {
   92                         struct mount *__sid_mountpoint;
   93                         int __sid_bsize_phys; /* min physical block size */
   94                         int __sid_bsize_best; /* optimal block size */
   95                         struct snaphead __sid_snapshots;
   96                         daddr_t __sid_snaplistsize; /* size of snapblklist. */
   97                         daddr_t *__sid_snapblklist; /* known snapshot blocks. */
   98                         int (*__sid_copyonwrite)(struct vnode *, struct buf *);
   99                 } __si_disk;
  100         } __si_u;
  101         char            __si_namebuf[SPECNAMELEN + 1];
  102 };
  103 
  104 #define si_tty          __si_u.__si_tty.__sit_tty
  105 #define si_mountpoint   __si_u.__si_disk.__sid_mountpoint
  106 #define si_bsize_phys   __si_u.__si_disk.__sid_bsize_phys
  107 #define si_bsize_best   __si_u.__si_disk.__sid_bsize_best
  108 #define si_snapshots    __si_u.__si_disk.__sid_snapshots
  109 #define si_snaplistsize __si_u.__si_disk.__sid_snaplistsize
  110 #define si_snapblklist  __si_u.__si_disk.__sid_snapblklist
  111 #define si_copyonwrite  __si_u.__si_disk.__sid_copyonwrite
  112 
  113 /*
  114  * Special device management
  115  */
  116 #define SPECHSZ 64
  117 #define SPECHASH(rdev)  (((unsigned)(minor(rdev)))%SPECHSZ)
  118 
  119 /*
  120  * Definitions of device driver entry switches
  121  */
  122 
  123 struct bio;
  124 struct buf;
  125 struct thread;
  126 struct uio;
  127 struct knote;
  128 
  129 /*
  130  * Note: d_thread_t is provided as a transition aid for those drivers
  131  * that treat struct proc/struct thread as an opaque data type and
  132  * exist in substantially the same form in both 4.x and 5.x.  Writers
  133  * of drivers that dips into the d_thread_t structure should use
  134  * struct thread or struct proc as appropriate for the version of the
  135  * OS they are using.  It is provided in lieu of each device driver
  136  * inventing its own way of doing this.  While it does violate style(9)
  137  * in a number of ways, this violation is deemed to be less
  138  * important than the benefits that a uniform API between releases
  139  * gives.
  140  *
  141  * Users of struct thread/struct proc that aren't device drivers should
  142  * not use d_thread_t.
  143  */
  144 
  145 typedef struct thread d_thread_t;
  146 
  147 typedef int d_open_t(dev_t dev, int oflags, int devtype, struct thread *td);
  148 typedef int d_fdopen_t(dev_t dev, int oflags, struct thread *td, int fdidx);
  149 typedef int d_close_t(dev_t dev, int fflag, int devtype, struct thread *td);
  150 typedef void d_strategy_t(struct bio *bp);
  151 typedef int d_ioctl_t(dev_t dev, u_long cmd, caddr_t data,
  152                       int fflag, struct thread *td);
  153 
  154 typedef int d_read_t(dev_t dev, struct uio *uio, int ioflag);
  155 typedef int d_write_t(dev_t dev, struct uio *uio, int ioflag);
  156 typedef int d_poll_t(dev_t dev, int events, struct thread *td);
  157 typedef int d_kqfilter_t(dev_t dev, struct knote *kn);
  158 typedef int d_mmap_t(dev_t dev, vm_offset_t offset, vm_paddr_t *paddr,
  159                      int nprot);
  160 
  161 typedef int l_open_t(dev_t dev, struct tty *tp);
  162 typedef int l_close_t(struct tty *tp, int flag);
  163 typedef int l_read_t(struct tty *tp, struct uio *uio, int flag);
  164 typedef int l_write_t(struct tty *tp, struct uio *uio, int flag);
  165 typedef int l_ioctl_t(struct tty *tp, u_long cmd, caddr_t data,
  166                       int flag, struct thread *td);
  167 typedef int l_rint_t(int c, struct tty *tp);
  168 typedef int l_start_t(struct tty *tp);
  169 typedef int l_modem_t(struct tty *tp, int flag);
  170 
  171 typedef int dumper_t(
  172         void *priv,             /* Private to the driver. */
  173         void *virtual,          /* Virtual (mapped) address. */
  174         vm_offset_t physical,   /* Physical address of virtual. */
  175         off_t offset,           /* Byte-offset to write at. */
  176         size_t length);         /* Number of bytes to dump. */
  177 
  178 #define DEV_STRATEGY(bp) dev_strategy(bp)
  179 
  180 #endif /* _KERNEL */
  181 
  182 /*
  183  * Types for d_flags.
  184  */
  185 #define D_TAPE  0x0001
  186 #define D_DISK  0x0002
  187 #define D_TTY   0x0004
  188 #define D_MEM   0x0008
  189 
  190 #ifdef _KERNEL 
  191 
  192 #define D_TYPEMASK      0xffff
  193 
  194 /*
  195  * Flags for d_flags.
  196  */
  197 #define D_MEMDISK       0x00010000      /* memory type disk */
  198 #define D_NAGGED        0x00020000      /* nagged about missing make_dev() */
  199 #define D_TRACKCLOSE    0x00080000      /* track all closes */
  200 #define D_MMAP_ANON     0x00100000      /* special treatment in vm_mmap.c */
  201 #define D_NOGIANT       0x00400000      /* Doesn't want Giant */
  202 
  203 /*
  204  * Character device switch table
  205  */
  206 struct cdevsw {
  207         int             d_maj;
  208         u_int           d_flags;
  209         const char      *d_name;
  210         d_open_t        *d_open;
  211         d_fdopen_t      *d_fdopen;
  212         d_close_t       *d_close;
  213         d_read_t        *d_read;
  214         d_write_t       *d_write;
  215         d_ioctl_t       *d_ioctl;
  216         d_poll_t        *d_poll;
  217         d_mmap_t        *d_mmap;
  218         d_strategy_t    *d_strategy;
  219         dumper_t        *d_dump;
  220         d_kqfilter_t    *d_kqfilter;
  221 };
  222 
  223 /*
  224  * Line discipline switch table
  225  */
  226 struct linesw {
  227         l_open_t        *l_open;
  228         l_close_t       *l_close;
  229         l_read_t        *l_read;
  230         l_write_t       *l_write;
  231         l_ioctl_t       *l_ioctl;
  232         l_rint_t        *l_rint;
  233         l_start_t       *l_start;
  234         l_modem_t       *l_modem;
  235         u_char          l_hotchar;
  236 };
  237 
  238 extern struct linesw linesw[];
  239 extern int nlinesw;
  240 
  241 int ldisc_register(int , struct linesw *);
  242 void ldisc_deregister(int);
  243 #define LDISC_LOAD      -1              /* Loadable line discipline */
  244 #endif /* _KERNEL */
  245 
  246 #ifdef _KERNEL
  247 
  248 #define NUMCDEVSW 256
  249 
  250 /*
  251  * XXX: do not use MAJOR_AUTO unless you have no choice.  In general drivers
  252  * should just not initialize .d_maj and that will DTRT.
  253  */
  254 #define MAJOR_AUTO      0       /* XXX: Not GM */
  255 
  256 l_ioctl_t       l_nullioctl;
  257 l_read_t        l_noread;
  258 l_write_t       l_nowrite;
  259 
  260 struct module;
  261 
  262 struct devsw_module_data {
  263         int     (*chainevh)(struct module *, int, void *); /* next handler */
  264         void    *chainarg;      /* arg for next event handler */
  265         /* Do not initialize fields hereafter */
  266 };
  267 
  268 #define DEV_MODULE(name, evh, arg)                                      \
  269 static moduledata_t name##_mod = {                                      \
  270     #name,                                                              \
  271     evh,                                                                \
  272     arg                                                                 \
  273 };                                                                      \
  274 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
  275 
  276 
  277 int     count_dev(dev_t _dev);
  278 void    destroy_dev(dev_t _dev);
  279 struct cdevsw *devsw(dev_t _dev);
  280 const char *devtoname(dev_t _dev);
  281 int     dev_named(dev_t _pdev, const char *_name);
  282 void    dev_depends(dev_t _pdev, dev_t _cdev);
  283 void    dev_strategy(struct buf *bp);
  284 void    freedev(dev_t _dev);
  285 dev_t   makebdev(int _maj, int _min);
  286 dev_t   make_dev(struct cdevsw *_devsw, int _minor, uid_t _uid, gid_t _gid,
  287                 int _perms, const char *_fmt, ...) __printflike(6, 7);
  288 dev_t   make_dev_alias(dev_t _pdev, const char *_fmt, ...) __printflike(2, 3);
  289 int     dev2unit(dev_t _dev);
  290 int     unit2minor(int _unit);
  291 void    setconf(void);
  292 dev_t   getdiskbyname(char *_name);
  293 
  294 void devfs_create(dev_t dev);
  295 void devfs_destroy(dev_t dev);
  296 
  297 #define         UID_ROOT        0
  298 #define         UID_BIN         3
  299 #define         UID_UUCP        66
  300 
  301 #define         GID_WHEEL       0
  302 #define         GID_KMEM        2
  303 #define         GID_OPERATOR    5
  304 #define         GID_BIN         7
  305 #define         GID_GAMES       13
  306 #define         GID_DIALER      68
  307 
  308 typedef void (*dev_clone_fn)(void *arg, char *name, int namelen, dev_t *result);
  309 
  310 int dev_stdclone(char *_name, char **_namep, const char *_stem, int *_unit);
  311 EVENTHANDLER_DECLARE(dev_clone, dev_clone_fn);
  312 
  313 /* Stuff relating to kernel-dump */
  314 
  315 struct dumperinfo {
  316         dumper_t *dumper;       /* Dumping function. */
  317         void    *priv;          /* Private parts. */
  318         u_int   blocksize;      /* Size of block in bytes. */
  319         off_t   mediaoffset;    /* Initial offset in bytes. */
  320         off_t   mediasize;      /* Space available in bytes. */
  321 };
  322 
  323 int set_dumper(struct dumperinfo *);
  324 void dumpsys(struct dumperinfo *);
  325 extern int dumping;             /* system is dumping */
  326 
  327 #endif /* _KERNEL */
  328 
  329 #endif /* !_SYS_CONF_H_ */

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