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: releng/8.1/sys/sys/conf.h 208344 2010-05-20 09:38:15Z kib $
   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 snapdata;
   50 struct devfs_dirent;
   51 struct cdevsw;
   52 struct file;
   53 
   54 struct cdev {
   55         void            *__si_reserved;
   56         u_int           si_flags;
   57 #define SI_ALIAS        0x0002  /* carrier of alias name */
   58 #define SI_NAMED        0x0004  /* make_dev{_alias} has been called */
   59 #define SI_CHEAPCLONE   0x0008  /* can be removed_dev'ed when vnode reclaims */
   60 #define SI_CHILD        0x0010  /* child of another struct cdev **/
   61 #define SI_DEVOPEN      0x0020  /* opened by device */
   62 #define SI_CONSOPEN     0x0040  /* opened by console */
   63 #define SI_DUMPDEV      0x0080  /* is kernel dumpdev */
   64 #define SI_CANDELETE    0x0100  /* can do BIO_DELETE */
   65 #define SI_CLONELIST    0x0200  /* on a clone list */
   66         struct timespec si_atime;
   67         struct timespec si_ctime;
   68         struct timespec si_mtime;
   69         uid_t           si_uid;
   70         gid_t           si_gid;
   71         mode_t          si_mode;
   72         struct ucred    *si_cred;       /* cached clone-time credential */
   73         int             si_drv0;
   74         int             si_refcount;
   75         LIST_ENTRY(cdev)        si_list;
   76         LIST_ENTRY(cdev)        si_clone;
   77         LIST_HEAD(, cdev)       si_children;
   78         LIST_ENTRY(cdev)        si_siblings;
   79         struct cdev *si_parent;
   80         char            *si_name;
   81         void            *si_drv1, *si_drv2;
   82         struct cdevsw   *si_devsw;
   83         int             si_iosize_max;  /* maximum I/O size (for physio &al) */
   84         u_long          si_usecount;
   85         u_long          si_threadcount;
   86         union {
   87                 struct snapdata *__sid_snapdata;
   88         } __si_u;
   89         char            __si_namebuf[SPECNAMELEN + 1];
   90 };
   91 
   92 #define si_snapdata     __si_u.__sid_snapdata
   93 
   94 #ifdef _KERNEL
   95 
   96 /*
   97  * Definitions of device driver entry switches
   98  */
   99 
  100 struct bio;
  101 struct buf;
  102 struct thread;
  103 struct uio;
  104 struct knote;
  105 struct clonedevs;
  106 struct vm_object;
  107 struct vnode;
  108 
  109 /*
  110  * Note: d_thread_t is provided as a transition aid for those drivers
  111  * that treat struct proc/struct thread as an opaque data type and
  112  * exist in substantially the same form in both 4.x and 5.x.  Writers
  113  * of drivers that dips into the d_thread_t structure should use
  114  * struct thread or struct proc as appropriate for the version of the
  115  * OS they are using.  It is provided in lieu of each device driver
  116  * inventing its own way of doing this.  While it does violate style(9)
  117  * in a number of ways, this violation is deemed to be less
  118  * important than the benefits that a uniform API between releases
  119  * gives.
  120  *
  121  * Users of struct thread/struct proc that aren't device drivers should
  122  * not use d_thread_t.
  123  */
  124 
  125 typedef struct thread d_thread_t;
  126 
  127 typedef int d_open_t(struct cdev *dev, int oflags, int devtype, struct thread *td);
  128 typedef int d_fdopen_t(struct cdev *dev, int oflags, struct thread *td, struct file *fp);
  129 typedef int d_close_t(struct cdev *dev, int fflag, int devtype, struct thread *td);
  130 typedef void d_strategy_t(struct bio *bp);
  131 typedef int d_ioctl_t(struct cdev *dev, u_long cmd, caddr_t data,
  132                       int fflag, struct thread *td);
  133 
  134 typedef int d_read_t(struct cdev *dev, struct uio *uio, int ioflag);
  135 typedef int d_write_t(struct cdev *dev, struct uio *uio, int ioflag);
  136 typedef int d_poll_t(struct cdev *dev, int events, struct thread *td);
  137 typedef int d_kqfilter_t(struct cdev *dev, struct knote *kn);
  138 typedef int d_mmap_t(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr,
  139                      int nprot);
  140 typedef int d_mmap2_t(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr,
  141                      int nprot, vm_memattr_t *memattr);
  142 typedef int d_mmap_single_t(struct cdev *cdev, vm_ooffset_t *offset,
  143     vm_size_t size, struct vm_object **object, int nprot);
  144 typedef void d_purge_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 #define D_NEEDMINOR     0x00800000      /* driver uses clone_create() */
  175 #define D_MMAP2         0x01000000      /* driver uses d_mmap2() */
  176 
  177 /*
  178  * Version numbers.
  179  */
  180 #define D_VERSION_00    0x20011966
  181 #define D_VERSION_01    0x17032005      /* Add d_uid,gid,mode & kind */
  182 #define D_VERSION_02    0x28042009      /* Add d_mmap_single */
  183 #define D_VERSION       D_VERSION_02
  184 
  185 /*
  186  * Flags used for internal housekeeping
  187  */
  188 #define D_INIT          0x80000000      /* cdevsw initialized */
  189 
  190 /*
  191  * Character device switch table
  192  */
  193 struct cdevsw {
  194         int                     d_version;
  195         u_int                   d_flags;
  196         const char              *d_name;
  197         d_open_t                *d_open;
  198         d_fdopen_t              *d_fdopen;
  199         d_close_t               *d_close;
  200         d_read_t                *d_read;
  201         d_write_t               *d_write;
  202         d_ioctl_t               *d_ioctl;
  203         d_poll_t                *d_poll;
  204         union {
  205                 d_mmap_t                *old;
  206                 d_mmap2_t               *new;
  207         } __d_mmap;
  208         d_strategy_t            *d_strategy;
  209         dumper_t                *d_dump;
  210         d_kqfilter_t            *d_kqfilter;
  211         d_purge_t               *d_purge;
  212         d_mmap_single_t         *d_mmap_single;
  213         uid_t                   d_uid;
  214         gid_t                   d_gid;
  215         mode_t                  d_mode;
  216         const char              *d_kind;
  217 
  218         /* These fields should not be messed with by drivers */
  219         LIST_ENTRY(cdevsw)      d_list;
  220         LIST_HEAD(, cdev)       d_devs;
  221         int                     d_spare3;
  222         union {
  223                 struct cdevsw           *gianttrick;
  224                 SLIST_ENTRY(cdevsw)     postfree_list;
  225         } __d_giant;
  226 };
  227 #define d_mmap                  __d_mmap.old
  228 #define d_mmap2                 __d_mmap.new
  229 #define d_gianttrick            __d_giant.gianttrick
  230 #define d_postfree_list         __d_giant.postfree_list
  231 
  232 struct module;
  233 
  234 struct devsw_module_data {
  235         int     (*chainevh)(struct module *, int, void *); /* next handler */
  236         void    *chainarg;      /* arg for next event handler */
  237         /* Do not initialize fields hereafter */
  238 };
  239 
  240 #define DEV_MODULE(name, evh, arg)                                      \
  241 static moduledata_t name##_mod = {                                      \
  242     #name,                                                              \
  243     evh,                                                                \
  244     arg                                                                 \
  245 };                                                                      \
  246 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
  247 
  248 
  249 void clone_setup(struct clonedevs **cdp);
  250 void clone_cleanup(struct clonedevs **);
  251 #define CLONE_UNITMASK 0xfffff
  252 #define CLONE_FLAG0 (CLONE_UNITMASK + 1)
  253 int clone_create(struct clonedevs **, struct cdevsw *, int *unit, struct cdev **dev, int extra);
  254 
  255 int     count_dev(struct cdev *_dev);
  256 void    destroy_dev(struct cdev *_dev);
  257 int     destroy_dev_sched(struct cdev *dev);
  258 int     destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg);
  259 void    destroy_dev_drain(struct cdevsw *csw);
  260 void    drain_dev_clone_events(void);
  261 struct cdevsw *dev_refthread(struct cdev *_dev);
  262 struct cdevsw *devvn_refthread(struct vnode *vp, struct cdev **devp);
  263 void    dev_relthread(struct cdev *_dev);
  264 void    dev_depends(struct cdev *_pdev, struct cdev *_cdev);
  265 void    dev_ref(struct cdev *dev);
  266 void    dev_refl(struct cdev *dev);
  267 void    dev_rel(struct cdev *dev);
  268 void    dev_strategy(struct cdev *dev, struct buf *bp);
  269 struct cdev *make_dev(struct cdevsw *_devsw, int _unit, uid_t _uid, gid_t _gid,
  270                 int _perms, const char *_fmt, ...) __printflike(6, 7);
  271 struct cdev *make_dev_cred(struct cdevsw *_devsw, int _unit,
  272                 struct ucred *_cr, uid_t _uid, gid_t _gid, int _perms,
  273                 const char *_fmt, ...) __printflike(7, 8);
  274 #define MAKEDEV_REF     0x1
  275 #define MAKEDEV_WHTOUT  0x2
  276 #define MAKEDEV_NOWAIT  0x4
  277 #define MAKEDEV_WAITOK  0x8
  278 struct cdev *make_dev_credf(int _flags,
  279                 struct cdevsw *_devsw, int _unit,
  280                 struct ucred *_cr, uid_t _uid, gid_t _gid, int _mode,
  281                 const char *_fmt, ...) __printflike(8, 9);
  282 struct cdev *make_dev_alias(struct cdev *_pdev, const char *_fmt, ...) __printflike(2, 3);
  283 void    dev_lock(void);
  284 void    dev_unlock(void);
  285 void    setconf(void);
  286 
  287 #define dev2unit(d)     ((d)->si_drv0)
  288 
  289 typedef void (*cdevpriv_dtr_t)(void *data);
  290 int     devfs_get_cdevpriv(void **datap);
  291 int     devfs_set_cdevpriv(void *priv, cdevpriv_dtr_t dtr);
  292 void    devfs_clear_cdevpriv(void);
  293 void    devfs_fpdrop(struct file *fp);  /* XXX This is not public KPI */
  294 
  295 #define         UID_ROOT        0
  296 #define         UID_BIN         3
  297 #define         UID_UUCP        66
  298 #define         UID_NOBODY      65534
  299 
  300 #define         GID_WHEEL       0
  301 #define         GID_KMEM        2
  302 #define         GID_TTY         4
  303 #define         GID_OPERATOR    5
  304 #define         GID_BIN         7
  305 #define         GID_GAMES       13
  306 #define         GID_DIALER      68
  307 #define         GID_NOBODY      65534
  308 
  309 typedef void (*dev_clone_fn)(void *arg, struct ucred *cred, char *name,
  310             int namelen, struct cdev **result);
  311 
  312 int dev_stdclone(char *_name, char **_namep, const char *_stem, int *_unit);
  313 EVENTHANDLER_DECLARE(dev_clone, dev_clone_fn);
  314 
  315 /* Stuff relating to kernel-dump */
  316 
  317 struct dumperinfo {
  318         dumper_t *dumper;       /* Dumping function. */
  319         void    *priv;          /* Private parts. */
  320         u_int   blocksize;      /* Size of block in bytes. */
  321         u_int   maxiosize;      /* Max size allowed for an individual I/O */
  322         off_t   mediaoffset;    /* Initial offset in bytes. */
  323         off_t   mediasize;      /* Space available in bytes. */
  324 };
  325 
  326 int set_dumper(struct dumperinfo *);
  327 int dump_write(struct dumperinfo *, void *, vm_offset_t, off_t, size_t);
  328 void dumpsys(struct dumperinfo *);
  329 extern int dumping;             /* system is dumping */
  330 
  331 #endif /* _KERNEL */
  332 
  333 #endif /* !_SYS_CONF_H_ */

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