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 snapdata;
   50 struct devfs_dirent;
   51 struct cdevsw;
   52 struct file;
   53 
   54 struct cdev {
   55         struct mount    *si_mountpt;
   56         u_int           si_flags;
   57 #define SI_ETERNAL      0x0001  /* never destroyed */
   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 #define SI_UNMAPPED     0x0400  /* can handle unmapped I/O */
   68         struct timespec si_atime;
   69         struct timespec si_ctime;
   70         struct timespec si_mtime;
   71         uid_t           si_uid;
   72         gid_t           si_gid;
   73         mode_t          si_mode;
   74         struct ucred    *si_cred;       /* cached clone-time credential */
   75         int             si_drv0;
   76         int             si_refcount;
   77         LIST_ENTRY(cdev)        si_list;
   78         LIST_ENTRY(cdev)        si_clone;
   79         LIST_HEAD(, cdev)       si_children;
   80         LIST_ENTRY(cdev)        si_siblings;
   81         struct cdev *si_parent;
   82         char            *si_name;
   83         void            *si_drv1, *si_drv2;
   84         struct cdevsw   *si_devsw;
   85         int             si_iosize_max;  /* maximum I/O size (for physio &al) */
   86         u_long          si_usecount;
   87         u_long          si_threadcount;
   88         union {
   89                 struct snapdata *__sid_snapdata;
   90         } __si_u;
   91         char            __si_namebuf[SPECNAMELEN + 1];
   92 };
   93 
   94 #define si_snapdata     __si_u.__sid_snapdata
   95 
   96 #ifdef _KERNEL
   97 
   98 /*
   99  * Definitions of device driver entry switches
  100  */
  101 
  102 struct bio;
  103 struct buf;
  104 struct thread;
  105 struct uio;
  106 struct knote;
  107 struct clonedevs;
  108 struct vm_object;
  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_ooffset_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_UNMAPPED_IO   0x01000000      /* d_strategy can accept unmapped IO */
  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_03    0x17122009      /* d_mmap takes memattr,vm_ooffset_t */
  184 #define D_VERSION       D_VERSION_03
  185 
  186 /*
  187  * Flags used for internal housekeeping
  188  */
  189 #define D_INIT          0x80000000      /* cdevsw initialized */
  190 
  191 /*
  192  * Character device switch table
  193  */
  194 struct cdevsw {
  195         int                     d_version;
  196         u_int                   d_flags;
  197         const char              *d_name;
  198         d_open_t                *d_open;
  199         d_fdopen_t              *d_fdopen;
  200         d_close_t               *d_close;
  201         d_read_t                *d_read;
  202         d_write_t               *d_write;
  203         d_ioctl_t               *d_ioctl;
  204         d_poll_t                *d_poll;
  205         d_mmap_t                *d_mmap;
  206         d_strategy_t            *d_strategy;
  207         dumper_t                *d_dump;
  208         d_kqfilter_t            *d_kqfilter;
  209         d_purge_t               *d_purge;
  210         d_mmap_single_t         *d_mmap_single;
  211 
  212         int32_t                 d_spare0[3];
  213         void                    *d_spare1[3];
  214 
  215         /* These fields should not be messed with by drivers */
  216         LIST_HEAD(, cdev)       d_devs;
  217         int                     d_spare2;
  218         union {
  219                 struct cdevsw           *gianttrick;
  220                 SLIST_ENTRY(cdevsw)     postfree_list;
  221         } __d_giant;
  222 };
  223 #define d_gianttrick            __d_giant.gianttrick
  224 #define d_postfree_list         __d_giant.postfree_list
  225 
  226 struct module;
  227 
  228 struct devsw_module_data {
  229         int     (*chainevh)(struct module *, int, void *); /* next handler */
  230         void    *chainarg;      /* arg for next event handler */
  231         /* Do not initialize fields hereafter */
  232 };
  233 
  234 #define DEV_MODULE(name, evh, arg)                                      \
  235 static moduledata_t name##_mod = {                                      \
  236     #name,                                                              \
  237     evh,                                                                \
  238     arg                                                                 \
  239 };                                                                      \
  240 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
  241 
  242 
  243 void clone_setup(struct clonedevs **cdp);
  244 void clone_cleanup(struct clonedevs **);
  245 #define CLONE_UNITMASK 0xfffff
  246 #define CLONE_FLAG0 (CLONE_UNITMASK + 1)
  247 int clone_create(struct clonedevs **, struct cdevsw *, int *unit, struct cdev **dev, int extra);
  248 
  249 int     count_dev(struct cdev *_dev);
  250 void    delist_dev(struct cdev *_dev);
  251 void    destroy_dev(struct cdev *_dev);
  252 int     destroy_dev_sched(struct cdev *dev);
  253 int     destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg);
  254 void    destroy_dev_drain(struct cdevsw *csw);
  255 void    drain_dev_clone_events(void);
  256 struct cdevsw *dev_refthread(struct cdev *_dev, int *_ref);
  257 struct cdevsw *devvn_refthread(struct vnode *vp, struct cdev **devp, int *_ref);
  258 void    dev_relthread(struct cdev *_dev, int _ref);
  259 void    dev_depends(struct cdev *_pdev, struct cdev *_cdev);
  260 void    dev_ref(struct cdev *dev);
  261 void    dev_refl(struct cdev *dev);
  262 void    dev_rel(struct cdev *dev);
  263 void    dev_strategy(struct cdev *dev, struct buf *bp);
  264 void    dev_strategy_csw(struct cdev *dev, struct cdevsw *csw, struct buf *bp);
  265 struct cdev *make_dev(struct cdevsw *_devsw, int _unit, 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 _unit,
  268                 struct ucred *_cr, uid_t _uid, gid_t _gid, int _perms,
  269                 const char *_fmt, ...) __printflike(7, 8);
  270 #define MAKEDEV_REF             0x01
  271 #define MAKEDEV_WHTOUT          0x02
  272 #define MAKEDEV_NOWAIT          0x04
  273 #define MAKEDEV_WAITOK          0x08
  274 #define MAKEDEV_ETERNAL         0x10
  275 #define MAKEDEV_CHECKNAME       0x20
  276 struct cdev *make_dev_credf(int _flags,
  277                 struct cdevsw *_devsw, int _unit,
  278                 struct ucred *_cr, uid_t _uid, gid_t _gid, int _mode,
  279                 const char *_fmt, ...) __printflike(8, 9);
  280 int     make_dev_p(int _flags, struct cdev **_cdev, struct cdevsw *_devsw,
  281                 struct ucred *_cr, uid_t _uid, gid_t _gid, int _mode,
  282                 const char *_fmt, ...) __printflike(8, 9);
  283 struct cdev *make_dev_alias(struct cdev *_pdev, const char *_fmt, ...)
  284                 __printflike(2, 3);
  285 int     make_dev_alias_p(int _flags, struct cdev **_cdev, struct cdev *_pdev,
  286                 const char *_fmt, ...) __printflike(4, 5);
  287 int     make_dev_physpath_alias(int _flags, struct cdev **_cdev,
  288                 struct cdev *_pdev, struct cdev *_old_alias,
  289                 const char *_physpath);
  290 void    dev_lock(void);
  291 void    dev_unlock(void);
  292 void    setconf(void);
  293 
  294 #ifdef KLD_MODULE
  295 #define MAKEDEV_ETERNAL_KLD     0
  296 #else
  297 #define MAKEDEV_ETERNAL_KLD     MAKEDEV_ETERNAL
  298 #endif
  299 
  300 #define dev2unit(d)     ((d)->si_drv0)
  301 
  302 typedef void (*cdevpriv_dtr_t)(void *data);
  303 int     devfs_get_cdevpriv(void **datap);
  304 int     devfs_set_cdevpriv(void *priv, cdevpriv_dtr_t dtr);
  305 void    devfs_clear_cdevpriv(void);
  306 void    devfs_fpdrop(struct file *fp);  /* XXX This is not public KPI */
  307 
  308 ino_t   devfs_alloc_cdp_inode(void);
  309 void    devfs_free_cdp_inode(ino_t ino);
  310 
  311 #define         UID_ROOT        0
  312 #define         UID_BIN         3
  313 #define         UID_UUCP        66
  314 #define         UID_NOBODY      65534
  315 
  316 #define         GID_WHEEL       0
  317 #define         GID_KMEM        2
  318 #define         GID_TTY         4
  319 #define         GID_OPERATOR    5
  320 #define         GID_BIN         7
  321 #define         GID_GAMES       13
  322 #define         GID_DIALER      68
  323 #define         GID_NOBODY      65534
  324 
  325 typedef void (*dev_clone_fn)(void *arg, struct ucred *cred, char *name,
  326             int namelen, struct cdev **result);
  327 
  328 int dev_stdclone(char *_name, char **_namep, const char *_stem, int *_unit);
  329 EVENTHANDLER_DECLARE(dev_clone, dev_clone_fn);
  330 
  331 /* Stuff relating to kernel-dump */
  332 
  333 struct dumperinfo {
  334         dumper_t *dumper;       /* Dumping function. */
  335         void    *priv;          /* Private parts. */
  336         u_int   blocksize;      /* Size of block in bytes. */
  337         u_int   maxiosize;      /* Max size allowed for an individual I/O */
  338         off_t   mediaoffset;    /* Initial offset in bytes. */
  339         off_t   mediasize;      /* Space available in bytes. */
  340 };
  341 
  342 int set_dumper(struct dumperinfo *);
  343 int dump_write(struct dumperinfo *, void *, vm_offset_t, off_t, size_t);
  344 void dumpsys(struct dumperinfo *);
  345 int doadump(boolean_t);
  346 extern int dumping;             /* system is dumping */
  347 
  348 #endif /* _KERNEL */
  349 
  350 #endif /* !_SYS_CONF_H_ */

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