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  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)conf.h      8.5 (Berkeley) 1/9/95
   37  * $FreeBSD$
   38  */
   39 
   40 #ifndef _SYS_CONF_H_
   41 #define _SYS_CONF_H_
   42 
   43 #ifdef _KERNEL
   44 #include <sys/eventhandler.h>
   45 
   46 struct tty;
   47 struct disk;
   48 struct vnode;
   49 struct buf;
   50 TAILQ_HEAD(snaphead, inode);
   51 
   52 struct cdev {
   53         u_int           si_flags;
   54 #define SI_STASHED      0x0001  /* created in stashed storage */
   55 #define SI_ALIAS        0x0002  /* carrier of alias name */
   56 #define SI_NAMED        0x0004  /* make_dev{_alias} has been called */
   57 #define SI_CHEAPCLONE   0x0008  /* can be removed_dev'ed when vnode reclaims */
   58 #define SI_CHILD        0x0010  /* child of another struct cdev **/
   59 #define SI_DEVOPEN      0x0020  /* opened by device */
   60 #define SI_CONSOPEN     0x0040  /* opened by console */
   61 #define SI_DUMPDEV      0x0080  /* is kernel dumpdev */
   62 #define SI_CANDELETE    0x0100  /* can do BIO_DELETE */
   63 #define SI_CLONELIST    0x0200  /* on a clone list */
   64         struct timespec si_atime;
   65         struct timespec si_ctime;
   66         struct timespec si_mtime;
   67         dev_t           si_udev;
   68         int             si_refcount;
   69         LIST_ENTRY(cdev)        si_list;
   70         LIST_ENTRY(cdev)        si_clone;
   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         struct cdev *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         u_long          si_threadcount;
   88         union {
   89                 struct {
   90                         struct tty *__sit_tty;
   91                 } __si_tty;
   92                 struct {
   93                         struct mount *__sid_mountpoint;
   94                         int __sid_bsize_phys; /* min physical block size */
   95                         int __sid_bsize_best; /* optimal block size */
   96                         struct snaphead __sid_snapshots;
   97                         daddr_t __sid_snaplistsize; /* size of snapblklist. */
   98                         daddr_t *__sid_snapblklist; /* known snapshot blocks. */
   99                         int (*__sid_copyonwrite)(struct vnode *, struct buf *);
  100                 } __si_disk;
  101         } __si_u;
  102         char            __si_namebuf[SPECNAMELEN + 1];
  103 };
  104 
  105 #define si_tty          __si_u.__si_tty.__sit_tty
  106 #define si_mountpoint   __si_u.__si_disk.__sid_mountpoint
  107 #define si_bsize_phys   __si_u.__si_disk.__sid_bsize_phys
  108 #define si_bsize_best   __si_u.__si_disk.__sid_bsize_best
  109 #define si_snapshots    __si_u.__si_disk.__sid_snapshots
  110 #define si_snaplistsize __si_u.__si_disk.__sid_snaplistsize
  111 #define si_snapblklist  __si_u.__si_disk.__sid_snapblklist
  112 #define si_copyonwrite  __si_u.__si_disk.__sid_copyonwrite
  113 
  114 /*
  115  * Definitions of device driver entry switches
  116  */
  117 
  118 struct bio;
  119 struct buf;
  120 struct thread;
  121 struct uio;
  122 struct knote;
  123 struct clonedevs;
  124 
  125 /*
  126  * Note: d_thread_t is provided as a transition aid for those drivers
  127  * that treat struct proc/struct thread as an opaque data type and
  128  * exist in substantially the same form in both 4.x and 5.x.  Writers
  129  * of drivers that dips into the d_thread_t structure should use
  130  * struct thread or struct proc as appropriate for the version of the
  131  * OS they are using.  It is provided in lieu of each device driver
  132  * inventing its own way of doing this.  While it does violate style(9)
  133  * in a number of ways, this violation is deemed to be less
  134  * important than the benefits that a uniform API between releases
  135  * gives.
  136  *
  137  * Users of struct thread/struct proc that aren't device drivers should
  138  * not use d_thread_t.
  139  */
  140 
  141 typedef struct thread d_thread_t;
  142 
  143 typedef int d_open_t(struct cdev *dev, int oflags, int devtype, struct thread *td);
  144 typedef int d_fdopen_t(struct cdev *dev, int oflags, struct thread *td, int fdidx);
  145 typedef int d_close_t(struct cdev *dev, int fflag, int devtype, struct thread *td);
  146 typedef void d_strategy_t(struct bio *bp);
  147 typedef int d_ioctl_t(struct cdev *dev, u_long cmd, caddr_t data,
  148                       int fflag, struct thread *td);
  149 
  150 typedef int d_read_t(struct cdev *dev, struct uio *uio, int ioflag);
  151 typedef int d_write_t(struct cdev *dev, struct uio *uio, int ioflag);
  152 typedef int d_poll_t(struct cdev *dev, int events, struct thread *td);
  153 typedef int d_kqfilter_t(struct cdev *dev, struct knote *kn);
  154 typedef int d_mmap_t(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr,
  155                      int nprot);
  156 
  157 typedef int d_spare1_t(struct cdev *dev);
  158 typedef int d_spare2_t(struct cdev *dev);
  159 
  160 typedef int dumper_t(
  161         void *priv,             /* Private to the driver. */
  162         void *virtual,          /* Virtual (mapped) address. */
  163         vm_offset_t physical,   /* Physical address of virtual. */
  164         off_t offset,           /* Byte-offset to write at. */
  165         size_t length);         /* Number of bytes to dump. */
  166 
  167 #define DEV_STRATEGY(bp) dev_strategy(bp)
  168 
  169 #endif /* _KERNEL */
  170 
  171 /*
  172  * Types for d_flags.
  173  */
  174 #define D_TAPE  0x0001
  175 #define D_DISK  0x0002
  176 #define D_TTY   0x0004
  177 #define D_MEM   0x0008
  178 
  179 #ifdef _KERNEL 
  180 
  181 #define D_TYPEMASK      0xffff
  182 
  183 /*
  184  * Flags for d_flags which the drivers can set.
  185  */
  186 #define D_MEMDISK       0x00010000      /* memory type disk */
  187 #define D_TRACKCLOSE    0x00080000      /* track all closes */
  188 #define D_MMAP_ANON     0x00100000      /* special treatment in vm_mmap.c */
  189 #define D_PSEUDO        0x00200000      /* make_dev() can return NULL */
  190 #define D_NEEDGIANT     0x00400000      /* driver want Giant */
  191 
  192 /*
  193  * Version numbers.
  194  */
  195 #define D_VERSION_00    0x20011966
  196 #define D_VERSION       D_VERSION_00
  197 
  198 /*
  199  * Flags used for internal housekeeping
  200  */
  201 #define D_INIT          0x80000000      /* cdevsw initialized */
  202 #define D_ALLOCMAJ      0x40000000      /* major# is allocated */
  203 
  204 /*
  205  * Character device switch table
  206  */
  207 struct cdevsw {
  208         int                     d_version;
  209         int                     d_maj;
  210         u_int                   d_flags;
  211         const char              *d_name;
  212         d_open_t                *d_open;
  213         d_fdopen_t              *d_fdopen;
  214         d_close_t               *d_close;
  215         d_read_t                *d_read;
  216         d_write_t               *d_write;
  217         d_ioctl_t               *d_ioctl;
  218         d_poll_t                *d_poll;
  219         d_mmap_t                *d_mmap;
  220         d_strategy_t            *d_strategy;
  221         dumper_t                *d_dump;
  222         d_kqfilter_t            *d_kqfilter;
  223         d_spare1_t              *d_spare1;
  224         d_spare2_t              *d_spare2;
  225 
  226         /* These fields should not be messed with by drivers */
  227         LIST_ENTRY(cdevsw)      d_list;
  228         LIST_HEAD(, cdev)       d_devs;
  229         int                     d_refcount;
  230 };
  231 
  232 #endif /* _KERNEL */
  233 
  234 #ifdef _KERNEL
  235 
  236 #define NUMCDEVSW 256
  237 
  238 /*
  239  * XXX: do not use MAJOR_AUTO unless you have no choice.  In general drivers
  240  * should just not initialize .d_maj and that will DTRT.
  241  */
  242 #define MAJOR_AUTO      0       /* XXX: Not GM */
  243 
  244 struct module;
  245 
  246 struct devsw_module_data {
  247         int     (*chainevh)(struct module *, int, void *); /* next handler */
  248         void    *chainarg;      /* arg for next event handler */
  249         /* Do not initialize fields hereafter */
  250 };
  251 
  252 #define DEV_MODULE(name, evh, arg)                                      \
  253 static moduledata_t name##_mod = {                                      \
  254     #name,                                                              \
  255     evh,                                                                \
  256     arg                                                                 \
  257 };                                                                      \
  258 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
  259 
  260 
  261 void clone_setup(struct clonedevs **cdp);
  262 void clone_cleanup(struct clonedevs **);
  263 #define CLONE_UNITMASK 0xfffff
  264 #define CLONE_FLAG0 (CLONE_UNITMASK + 1)
  265 int clone_create(struct clonedevs **, struct cdevsw *, int *unit, struct cdev **dev, u_int extra);
  266 
  267 int     count_dev(struct cdev *_dev);
  268 void    destroy_dev(struct cdev *_dev);
  269 struct cdevsw *devsw(struct cdev *_dev);
  270 void    cdevsw_ref(struct cdevsw *);
  271 void    cdevsw_rel(struct cdevsw *);
  272 const char *devtoname(struct cdev *_dev);
  273 int     dev_named(struct cdev *_pdev, const char *_name);
  274 void    dev_depends(struct cdev *_pdev, struct cdev *_cdev);
  275 void    dev_ref(struct cdev *dev);
  276 void    dev_rel(struct cdev *dev);
  277 void    dev_strategy(struct buf *bp);
  278 struct cdev *makebdev(int _maj, int _min);
  279 struct cdev *make_dev(struct cdevsw *_devsw, int _minor, uid_t _uid, gid_t _gid,
  280                 int _perms, const char *_fmt, ...) __printflike(6, 7);
  281 struct cdev *make_dev_alias(struct cdev *_pdev, const char *_fmt, ...) __printflike(2, 3);
  282 int     dev2unit(struct cdev *_dev);
  283 int     unit2minor(int _unit);
  284 void    setconf(void);
  285 struct cdev *getdiskbyname(char *_name);
  286 
  287 void devfs_create(struct cdev *dev);
  288 void devfs_destroy(struct cdev *dev);
  289 
  290 #define         UID_ROOT        0
  291 #define         UID_BIN         3
  292 #define         UID_UUCP        66
  293 
  294 #define         GID_WHEEL       0
  295 #define         GID_KMEM        2
  296 #define         GID_OPERATOR    5
  297 #define         GID_BIN         7
  298 #define         GID_GAMES       13
  299 #define         GID_DIALER      68
  300 
  301 typedef void (*dev_clone_fn)(void *arg, char *name, int namelen, struct cdev **result);
  302 
  303 int dev_stdclone(char *_name, char **_namep, const char *_stem, int *_unit);
  304 EVENTHANDLER_DECLARE(dev_clone, dev_clone_fn);
  305 
  306 /* Stuff relating to kernel-dump */
  307 
  308 struct dumperinfo {
  309         dumper_t *dumper;       /* Dumping function. */
  310         void    *priv;          /* Private parts. */
  311         u_int   blocksize;      /* Size of block in bytes. */
  312         off_t   mediaoffset;    /* Initial offset in bytes. */
  313         off_t   mediasize;      /* Space available in bytes. */
  314 };
  315 
  316 int set_dumper(struct dumperinfo *);
  317 void dumpsys(struct dumperinfo *);
  318 extern int dumping;             /* system is dumping */
  319 
  320 /* D_TTY related functions */
  321 d_ioctl_t        ttyioctl;
  322 d_kqfilter_t     ttykqfilter;
  323 d_poll_t         ttypoll;
  324 d_read_t         ttyread;
  325 d_write_t        ttywrite;
  326 
  327 #endif /* _KERNEL */
  328 
  329 #endif /* !_SYS_CONF_H_ */

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