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 #else
   46 #include <sys/queue.h>
   47 #endif
   48 
   49 struct tty;
   50 struct snapdata;
   51 struct devfs_dirent;
   52 struct cdevsw;
   53 struct file;
   54 
   55 struct cdev {
   56         struct cdev_priv        *si_priv;
   57         u_int           si_flags;
   58 #define SI_ALIAS        0x0002  /* carrier of alias name */
   59 #define SI_NAMED        0x0004  /* make_dev{_alias} has been called */
   60 #define SI_CHEAPCLONE   0x0008  /* can be removed_dev'ed when vnode reclaims */
   61 #define SI_CHILD        0x0010  /* child of another struct cdev **/
   62 #define SI_DEVOPEN      0x0020  /* opened by device */
   63 #define SI_CONSOPEN     0x0040  /* opened by console */
   64 #define SI_DUMPDEV      0x0080  /* is kernel dumpdev */
   65 #define SI_CANDELETE    0x0100  /* can do BIO_DELETE */
   66 #define SI_CLONELIST    0x0200  /* on a clone list */
   67         struct timespec si_atime;
   68         struct timespec si_ctime;
   69         struct timespec si_mtime;
   70         uid_t           si_uid;
   71         gid_t           si_gid;
   72         mode_t          si_mode;
   73         struct ucred    *si_cred;       /* cached clone-time credential */
   74         u_int           si_drv0;
   75         int             si_refcount;
   76         LIST_ENTRY(cdev)        si_list;
   77         LIST_ENTRY(cdev)        si_clone;
   78         LIST_HEAD(, cdev)       si_children;
   79         LIST_ENTRY(cdev)        si_siblings;
   80         struct cdev *si_parent;
   81         char            *si_name;
   82         void            *si_drv1, *si_drv2;
   83         struct cdevsw   *si_devsw;
   84         int             si_iosize_max;  /* maximum I/O size (for physio &al) */
   85         u_long          si_usecount;
   86         u_long          si_threadcount;
   87         union {
   88                 struct tty *__sit_tty;
   89                 struct snapdata *__sid_snapdata;
   90         } __si_u;
   91         char            __si_namebuf[SPECNAMELEN + 1];
   92 };
   93 
   94 #define si_tty          __si_u.__sit_tty
   95 #define si_snapdata     __si_u.__sid_snapdata
   96 
   97 #ifdef _KERNEL
   98 
   99 /*
  100  * Definitions of device driver entry switches
  101  */
  102 
  103 struct bio;
  104 struct buf;
  105 struct thread;
  106 struct uio;
  107 struct knote;
  108 struct clonedevs;
  109 struct vnode;
  110 
  111 /*
  112  * Note: d_thread_t is provided as a transition aid for those drivers
  113  * that treat struct proc/struct thread as an opaque data type and
  114  * exist in substantially the same form in both 4.x and 5.x.  Writers
  115  * of drivers that dips into the d_thread_t structure should use
  116  * struct thread or struct proc as appropriate for the version of the
  117  * OS they are using.  It is provided in lieu of each device driver
  118  * inventing its own way of doing this.  While it does violate style(9)
  119  * in a number of ways, this violation is deemed to be less
  120  * important than the benefits that a uniform API between releases
  121  * gives.
  122  *
  123  * Users of struct thread/struct proc that aren't device drivers should
  124  * not use d_thread_t.
  125  */
  126 
  127 typedef struct thread d_thread_t;
  128 
  129 typedef int d_open_t(struct cdev *dev, int oflags, int devtype, struct thread *td);
  130 typedef int d_fdopen_t(struct cdev *dev, int oflags, struct thread *td, struct file *fp);
  131 typedef int d_close_t(struct cdev *dev, int fflag, int devtype, struct thread *td);
  132 typedef void d_strategy_t(struct bio *bp);
  133 typedef int d_ioctl_t(struct cdev *dev, u_long cmd, caddr_t data,
  134                       int fflag, struct thread *td);
  135 
  136 typedef int d_read_t(struct cdev *dev, struct uio *uio, int ioflag);
  137 typedef int d_write_t(struct cdev *dev, struct uio *uio, int ioflag);
  138 typedef int d_poll_t(struct cdev *dev, int events, struct thread *td);
  139 typedef int d_kqfilter_t(struct cdev *dev, struct knote *kn);
  140 typedef int d_mmap_t(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr,
  141                      int nprot);
  142 typedef void d_purge_t(struct cdev *dev);
  143 
  144 typedef int d_spare2_t(struct cdev *dev);
  145 
  146 typedef int dumper_t(
  147         void *priv,             /* Private to the driver. */
  148         void *virtual,          /* Virtual (mapped) address. */
  149         vm_offset_t physical,   /* Physical address of virtual. */
  150         off_t offset,           /* Byte-offset to write at. */
  151         size_t length);         /* Number of bytes to dump. */
  152 
  153 #endif /* _KERNEL */
  154 
  155 /*
  156  * Types for d_flags.
  157  */
  158 #define D_TAPE  0x0001
  159 #define D_DISK  0x0002
  160 #define D_TTY   0x0004
  161 #define D_MEM   0x0008
  162 
  163 #ifdef _KERNEL 
  164 
  165 #define D_TYPEMASK      0xffff
  166 
  167 /*
  168  * Flags for d_flags which the drivers can set.
  169  */
  170 #define D_TRACKCLOSE    0x00080000      /* track all closes */
  171 #define D_MMAP_ANON     0x00100000      /* special treatment in vm_mmap.c */
  172 #define D_PSEUDO        0x00200000      /* make_dev() can return NULL */
  173 #define D_NEEDGIANT     0x00400000      /* driver want Giant */
  174 
  175 /*
  176  * Version numbers.
  177  */
  178 #define D_VERSION_00    0x20011966
  179 #define D_VERSION_01    0x17032005      /* Add d_uid,gid,mode & kind */
  180 #define D_VERSION       D_VERSION_01
  181 
  182 /*
  183  * Flags used for internal housekeeping
  184  */
  185 #define D_INIT          0x80000000      /* cdevsw initialized */
  186 
  187 /*
  188  * Character device switch table
  189  */
  190 struct cdevsw {
  191         int                     d_version;
  192         u_int                   d_flags;
  193         const char              *d_name;
  194         d_open_t                *d_open;
  195         d_fdopen_t              *d_fdopen;
  196         d_close_t               *d_close;
  197         d_read_t                *d_read;
  198         d_write_t               *d_write;
  199         d_ioctl_t               *d_ioctl;
  200         d_poll_t                *d_poll;
  201         d_mmap_t                *d_mmap;
  202         d_strategy_t            *d_strategy;
  203         dumper_t                *d_dump;
  204         d_kqfilter_t            *d_kqfilter;
  205         d_purge_t               *d_purge;
  206         d_spare2_t              *d_spare2;
  207         uid_t                   d_uid;
  208         gid_t                   d_gid;
  209         mode_t                  d_mode;
  210         const char              *d_kind;
  211 
  212         /* These fields should not be messed with by drivers */
  213         LIST_ENTRY(cdevsw)      d_list;
  214         LIST_HEAD(, cdev)       d_devs;
  215         int                     d_spare3;
  216         union {
  217                 struct cdevsw           *gianttrick;
  218                 SLIST_ENTRY(cdevsw)     postfree_list;
  219         } __d_giant;
  220 };
  221 #define d_gianttrick            __d_giant.gianttrick
  222 #define d_postfree_list         __d_giant.postfree_list
  223 
  224 #define NUMCDEVSW 256
  225 
  226 #define MAXMINOR        0xffff00ffU
  227 
  228 struct module;
  229 
  230 struct devsw_module_data {
  231         int     (*chainevh)(struct module *, int, void *); /* next handler */
  232         void    *chainarg;      /* arg for next event handler */
  233         /* Do not initialize fields hereafter */
  234 };
  235 
  236 #define DEV_MODULE(name, evh, arg)                                      \
  237 static moduledata_t name##_mod = {                                      \
  238     #name,                                                              \
  239     evh,                                                                \
  240     arg                                                                 \
  241 };                                                                      \
  242 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
  243 
  244 
  245 void clone_setup(struct clonedevs **cdp);
  246 void clone_cleanup(struct clonedevs **);
  247 #define CLONE_UNITMASK 0xfffff
  248 #define CLONE_FLAG0 (CLONE_UNITMASK + 1)
  249 int clone_create(struct clonedevs **, struct cdevsw *, int *unit, struct cdev **dev, int extra);
  250 
  251 int     count_dev(struct cdev *_dev);
  252 void    destroy_dev(struct cdev *_dev);
  253 int     destroy_dev_sched(struct cdev *dev);
  254 int     destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg);
  255 void    destroy_dev_drain(struct cdevsw *csw);
  256 void    drain_dev_clone_events(void);
  257 struct cdevsw *dev_refthread(struct cdev *_dev);
  258 struct cdevsw *devvn_refthread(struct vnode *vp, struct cdev **devp);
  259 void    dev_relthread(struct cdev *_dev);
  260 void    dev_depends(struct cdev *_pdev, struct cdev *_cdev);
  261 void    dev_ref(struct cdev *dev);
  262 void    dev_refl(struct cdev *dev);
  263 void    dev_rel(struct cdev *dev);
  264 void    dev_strategy(struct cdev *dev, struct buf *bp);
  265 struct cdev *make_dev(struct cdevsw *_devsw, int _minor, uid_t _uid, gid_t _gid,
  266                 int _perms, const char *_fmt, ...) __printflike(6, 7);
  267 struct cdev *make_dev_cred(struct cdevsw *_devsw, int _minor,
  268                 struct ucred *_cr, uid_t _uid, gid_t _gid, int _perms,
  269                 const char *_fmt, ...) __printflike(7, 8);
  270 #define MAKEDEV_REF     0x1
  271 #define MAKEDEV_WHTOUT  0x2
  272 struct cdev *make_dev_credf(int _flags,
  273                 struct cdevsw *_devsw, int _minornr,
  274                 struct ucred *_cr, uid_t _uid, gid_t _gid, int _mode,
  275                 const char *_fmt, ...) __printflike(8, 9);
  276 struct cdev *make_dev_alias(struct cdev *_pdev, const char *_fmt, ...) __printflike(2, 3);
  277 int     dev2unit(struct cdev *_dev);
  278 void    dev_lock(void);
  279 void    dev_unlock(void);
  280 int     unit2minor(int _unit);
  281 u_int   minor2unit(u_int _minor);
  282 void    setconf(void);
  283 
  284 typedef void (*cdevpriv_dtr_t)(void *data);
  285 int     devfs_get_cdevpriv(void **datap);
  286 int     devfs_set_cdevpriv(void *priv, cdevpriv_dtr_t dtr);
  287 void    devfs_clear_cdevpriv(void);
  288 void    devfs_fpdrop(struct file *fp);  /* XXX This is not public KPI */
  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, struct ucred *cred, char *name,
  302             int namelen, struct cdev **result);
  303 
  304 int dev_stdclone(char *_name, char **_namep, const char *_stem, int *_unit);
  305 EVENTHANDLER_DECLARE(dev_clone, dev_clone_fn);
  306 
  307 /* Stuff relating to kernel-dump */
  308 
  309 struct dumperinfo {
  310         dumper_t *dumper;       /* Dumping function. */
  311         void    *priv;          /* Private parts. */
  312         u_int   blocksize;      /* Size of block in bytes. */
  313         off_t   mediaoffset;    /* Initial offset in bytes. */
  314         off_t   mediasize;      /* Space available in bytes. */
  315 };
  316 
  317 int set_dumper(struct dumperinfo *);
  318 int dump_write(struct dumperinfo *, void *, vm_offset_t, off_t, size_t);
  319 void dumpsys(struct dumperinfo *);
  320 extern int dumping;             /* system is dumping */
  321 
  322 /* D_TTY related functions */
  323 d_close_t        ttyclose;
  324 d_ioctl_t        ttyioctl;
  325 d_kqfilter_t     ttykqfilter;
  326 d_open_t         ttyopen;
  327 d_poll_t         ttypoll;
  328 d_read_t         ttyread;
  329 d_write_t        ttywrite;
  330 
  331 #endif /* _KERNEL */
  332 
  333 #endif /* !_SYS_CONF_H_ */

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