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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * Copyright (c) 2000
    7  *      Poul-Henning Kamp.  All rights reserved.
    8  * (c) UNIX System Laboratories, Inc.
    9  * All or some portions of this file are derived from material licensed
   10  * to the University of California by American Telephone and Telegraph
   11  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   12  * the permission of UNIX System Laboratories, Inc.
   13  *
   14  * Redistribution and use in source and binary forms, with or without
   15  * modification, are permitted provided that the following conditions
   16  * are met:
   17  * 1. Redistributions of source code must retain the above copyright
   18  *    notice, this list of conditions and the following disclaimer.
   19  * 2. Redistributions in binary form must reproduce the above copyright
   20  *    notice, this list of conditions and the following disclaimer in the
   21  *    documentation and/or other materials provided with the distribution.
   22  * 3. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      @(#)conf.h      8.5 (Berkeley) 1/9/95
   39  * $FreeBSD: stable/12/sys/sys/conf.h 333282 2018-05-06 00:22:38Z markj $
   40  */
   41 
   42 #ifndef _SYS_CONF_H_
   43 #define _SYS_CONF_H_
   44 
   45 #ifdef _KERNEL
   46 #include <sys/eventhandler.h>
   47 #else
   48 #include <sys/queue.h>
   49 #endif
   50 
   51 struct snapdata;
   52 struct devfs_dirent;
   53 struct cdevsw;
   54 struct file;
   55 
   56 struct cdev {
   57         void            *si_spare0;
   58         u_int           si_flags;
   59 #define SI_ETERNAL      0x0001  /* never destroyed */
   60 #define SI_ALIAS        0x0002  /* carrier of alias name */
   61 #define SI_NAMED        0x0004  /* make_dev{_alias} has been called */
   62 #define SI_CHEAPCLONE   0x0008  /* can be removed_dev'ed when vnode reclaims */
   63 #define SI_CHILD        0x0010  /* child of another struct cdev **/
   64 #define SI_DUMPDEV      0x0080  /* is kernel dumpdev */
   65 #define SI_CLONELIST    0x0200  /* on a clone list */
   66 #define SI_UNMAPPED     0x0400  /* can handle unmapped I/O */
   67 #define SI_NOSPLIT      0x0800  /* I/O should not be split up */
   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         struct mount    *si_mountpt;
   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_name[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 dumperinfo;
  105 struct kerneldumpheader;
  106 struct thread;
  107 struct uio;
  108 struct knote;
  109 struct clonedevs;
  110 struct vm_object;
  111 struct vnode;
  112 
  113 typedef int d_open_t(struct cdev *dev, int oflags, int devtype, struct thread *td);
  114 typedef int d_fdopen_t(struct cdev *dev, int oflags, struct thread *td, struct file *fp);
  115 typedef int d_close_t(struct cdev *dev, int fflag, int devtype, struct thread *td);
  116 typedef void d_strategy_t(struct bio *bp);
  117 typedef int d_ioctl_t(struct cdev *dev, u_long cmd, caddr_t data,
  118                       int fflag, struct thread *td);
  119 
  120 typedef int d_read_t(struct cdev *dev, struct uio *uio, int ioflag);
  121 typedef int d_write_t(struct cdev *dev, struct uio *uio, int ioflag);
  122 typedef int d_poll_t(struct cdev *dev, int events, struct thread *td);
  123 typedef int d_kqfilter_t(struct cdev *dev, struct knote *kn);
  124 typedef int d_mmap_t(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
  125                      int nprot, vm_memattr_t *memattr);
  126 typedef int d_mmap_single_t(struct cdev *cdev, vm_ooffset_t *offset,
  127     vm_size_t size, struct vm_object **object, int nprot);
  128 typedef void d_purge_t(struct cdev *dev);
  129 
  130 typedef int dumper_t(
  131         void *_priv,            /* Private to the driver. */
  132         void *_virtual,         /* Virtual (mapped) address. */
  133         vm_offset_t _physical,  /* Physical address of virtual. */
  134         off_t _offset,          /* Byte-offset to write at. */
  135         size_t _length);        /* Number of bytes to dump. */
  136 typedef int dumper_start_t(struct dumperinfo *di);
  137 typedef int dumper_hdr_t(struct dumperinfo *di, struct kerneldumpheader *kdh,
  138     void *key, uint32_t keylen);
  139 
  140 #endif /* _KERNEL */
  141 
  142 /*
  143  * Types for d_flags.
  144  */
  145 #define D_TAPE  0x0001
  146 #define D_DISK  0x0002
  147 #define D_TTY   0x0004
  148 #define D_MEM   0x0008  /* /dev/(k)mem */
  149 
  150 #ifdef _KERNEL
  151 
  152 #define D_TYPEMASK      0xffff
  153 
  154 /*
  155  * Flags for d_flags which the drivers can set.
  156  */
  157 #define D_TRACKCLOSE    0x00080000      /* track all closes */
  158 #define D_MMAP_ANON     0x00100000      /* special treatment in vm_mmap.c */
  159 #define D_NEEDGIANT     0x00400000      /* driver want Giant */
  160 #define D_NEEDMINOR     0x00800000      /* driver uses clone_create() */
  161 
  162 /*
  163  * Version numbers.
  164  */
  165 #define D_VERSION_00    0x20011966
  166 #define D_VERSION_01    0x17032005      /* Add d_uid,gid,mode & kind */
  167 #define D_VERSION_02    0x28042009      /* Add d_mmap_single */
  168 #define D_VERSION_03    0x17122009      /* d_mmap takes memattr,vm_ooffset_t */
  169 #define D_VERSION       D_VERSION_03
  170 
  171 /*
  172  * Flags used for internal housekeeping
  173  */
  174 #define D_INIT          0x80000000      /* cdevsw initialized */
  175 
  176 /*
  177  * Character device switch table
  178  */
  179 struct cdevsw {
  180         int                     d_version;
  181         u_int                   d_flags;
  182         const char              *d_name;
  183         d_open_t                *d_open;
  184         d_fdopen_t              *d_fdopen;
  185         d_close_t               *d_close;
  186         d_read_t                *d_read;
  187         d_write_t               *d_write;
  188         d_ioctl_t               *d_ioctl;
  189         d_poll_t                *d_poll;
  190         d_mmap_t                *d_mmap;
  191         d_strategy_t            *d_strategy;
  192         dumper_t                *d_dump;
  193         d_kqfilter_t            *d_kqfilter;
  194         d_purge_t               *d_purge;
  195         d_mmap_single_t         *d_mmap_single;
  196 
  197         int32_t                 d_spare0[3];
  198         void                    *d_spare1[3];
  199 
  200         /* These fields should not be messed with by drivers */
  201         LIST_HEAD(, cdev)       d_devs;
  202         int                     d_spare2;
  203         union {
  204                 struct cdevsw           *gianttrick;
  205                 SLIST_ENTRY(cdevsw)     postfree_list;
  206         } __d_giant;
  207 };
  208 #define d_gianttrick            __d_giant.gianttrick
  209 #define d_postfree_list         __d_giant.postfree_list
  210 
  211 struct module;
  212 
  213 struct devsw_module_data {
  214         int     (*chainevh)(struct module *, int, void *); /* next handler */
  215         void    *chainarg;      /* arg for next event handler */
  216         /* Do not initialize fields hereafter */
  217 };
  218 
  219 #define DEV_MODULE_ORDERED(name, evh, arg, ord)                         \
  220 static moduledata_t name##_mod = {                                      \
  221     #name,                                                              \
  222     evh,                                                                \
  223     arg                                                                 \
  224 };                                                                      \
  225 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, ord)
  226 
  227 #define DEV_MODULE(name, evh, arg)                                      \
  228     DEV_MODULE_ORDERED(name, evh, arg, SI_ORDER_MIDDLE)
  229 
  230 void clone_setup(struct clonedevs **cdp);
  231 void clone_cleanup(struct clonedevs **);
  232 #define CLONE_UNITMASK  0xfffff
  233 #define CLONE_FLAG0     (CLONE_UNITMASK + 1)
  234 int clone_create(struct clonedevs **, struct cdevsw *, int *unit, struct cdev **dev, int extra);
  235 
  236 #define MAKEDEV_REF             0x01
  237 #define MAKEDEV_WHTOUT          0x02
  238 #define MAKEDEV_NOWAIT          0x04
  239 #define MAKEDEV_WAITOK          0x08
  240 #define MAKEDEV_ETERNAL         0x10
  241 #define MAKEDEV_CHECKNAME       0x20
  242 struct make_dev_args {
  243         size_t           mda_size;
  244         int              mda_flags;
  245         struct cdevsw   *mda_devsw;
  246         struct ucred    *mda_cr;
  247         uid_t            mda_uid;
  248         gid_t            mda_gid;
  249         int              mda_mode;
  250         int              mda_unit;
  251         void            *mda_si_drv1;
  252         void            *mda_si_drv2;
  253 };
  254 void make_dev_args_init_impl(struct make_dev_args *_args, size_t _sz);
  255 #define make_dev_args_init(a) \
  256     make_dev_args_init_impl((a), sizeof(struct make_dev_args))
  257         
  258 int     count_dev(struct cdev *_dev);
  259 void    delist_dev(struct cdev *_dev);
  260 void    destroy_dev(struct cdev *_dev);
  261 int     destroy_dev_sched(struct cdev *dev);
  262 int     destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg);
  263 void    destroy_dev_drain(struct cdevsw *csw);
  264 void    drain_dev_clone_events(void);
  265 struct cdevsw *dev_refthread(struct cdev *_dev, int *_ref);
  266 struct cdevsw *devvn_refthread(struct vnode *vp, struct cdev **devp, int *_ref);
  267 void    dev_relthread(struct cdev *_dev, int _ref);
  268 void    dev_depends(struct cdev *_pdev, struct cdev *_cdev);
  269 void    dev_ref(struct cdev *dev);
  270 void    dev_refl(struct cdev *dev);
  271 void    dev_rel(struct cdev *dev);
  272 struct cdev *make_dev(struct cdevsw *_devsw, int _unit, uid_t _uid, gid_t _gid,
  273                 int _perms, const char *_fmt, ...) __printflike(6, 7);
  274 struct cdev *make_dev_cred(struct cdevsw *_devsw, int _unit,
  275                 struct ucred *_cr, uid_t _uid, gid_t _gid, int _perms,
  276                 const char *_fmt, ...) __printflike(7, 8);
  277 struct cdev *make_dev_credf(int _flags,
  278                 struct cdevsw *_devsw, int _unit,
  279                 struct ucred *_cr, uid_t _uid, gid_t _gid, int _mode,
  280                 const char *_fmt, ...) __printflike(8, 9);
  281 int     make_dev_p(int _flags, struct cdev **_cdev, struct cdevsw *_devsw,
  282                 struct ucred *_cr, uid_t _uid, gid_t _gid, int _mode,
  283                 const char *_fmt, ...) __printflike(8, 9);
  284 int     make_dev_s(struct make_dev_args *_args, struct cdev **_cdev,
  285                 const char *_fmt, ...) __printflike(3, 4);
  286 struct cdev *make_dev_alias(struct cdev *_pdev, const char *_fmt, ...)
  287                 __printflike(2, 3);
  288 int     make_dev_alias_p(int _flags, struct cdev **_cdev, struct cdev *_pdev,
  289                 const char *_fmt, ...) __printflike(4, 5);
  290 int     make_dev_physpath_alias(int _flags, struct cdev **_cdev,
  291                 struct cdev *_pdev, struct cdev *_old_alias,
  292                 const char *_physpath);
  293 void    dev_lock(void);
  294 void    dev_unlock(void);
  295 
  296 #ifdef KLD_MODULE
  297 #define MAKEDEV_ETERNAL_KLD     0
  298 #else
  299 #define MAKEDEV_ETERNAL_KLD     MAKEDEV_ETERNAL
  300 #endif
  301 
  302 #define dev2unit(d)     ((d)->si_drv0)
  303 
  304 typedef void d_priv_dtor_t(void *data);
  305 int     devfs_get_cdevpriv(void **datap);
  306 int     devfs_set_cdevpriv(void *priv, d_priv_dtor_t *dtr);
  307 void    devfs_clear_cdevpriv(void);
  308 
  309 ino_t   devfs_alloc_cdp_inode(void);
  310 void    devfs_free_cdp_inode(ino_t ino);
  311 
  312 #define         UID_ROOT        0
  313 #define         UID_BIN         3
  314 #define         UID_UUCP        66
  315 #define         UID_NOBODY      65534
  316 
  317 #define         GID_WHEEL       0
  318 #define         GID_KMEM        2
  319 #define         GID_TTY         4
  320 #define         GID_OPERATOR    5
  321 #define         GID_BIN         7
  322 #define         GID_GAMES       13
  323 #define         GID_VIDEO       44
  324 #define         GID_DIALER      68
  325 #define         GID_NOGROUP     65533
  326 #define         GID_NOBODY      65534
  327 
  328 typedef void (*dev_clone_fn)(void *arg, struct ucred *cred, char *name,
  329             int namelen, struct cdev **result);
  330 
  331 int dev_stdclone(char *_name, char **_namep, const char *_stem, int *_unit);
  332 EVENTHANDLER_DECLARE(dev_clone, dev_clone_fn);
  333 
  334 /* Stuff relating to kernel-dump */
  335 struct kerneldumpcrypto;
  336 struct kerneldumpheader;
  337 
  338 struct dumperinfo {
  339         dumper_t *dumper;       /* Dumping function. */
  340         dumper_start_t *dumper_start; /* Dumper callback for dump_start(). */
  341         dumper_hdr_t *dumper_hdr; /* Dumper callback for writing headers. */
  342         void    *priv;          /* Private parts. */
  343         u_int   blocksize;      /* Size of block in bytes. */
  344         u_int   maxiosize;      /* Max size allowed for an individual I/O */
  345         off_t   mediaoffset;    /* Initial offset in bytes. */
  346         off_t   mediasize;      /* Space available in bytes. */
  347 
  348         /* MI kernel dump state. */
  349         void    *blockbuf;      /* Buffer for padding shorter dump blocks */
  350         off_t   dumpoff;        /* Offset of ongoing kernel dump. */
  351         off_t   origdumpoff;    /* Starting dump offset. */
  352         struct kerneldumpcrypto *kdcrypto; /* Kernel dump crypto. */
  353         struct kerneldumpcomp *kdcomp; /* Kernel dump compression. */
  354 };
  355 
  356 extern int dumping;             /* system is dumping */
  357 
  358 int doadump(boolean_t);
  359 int set_dumper(struct dumperinfo *di, const char *devname, struct thread *td,
  360     uint8_t compression, uint8_t encryption, const uint8_t *key,
  361     uint32_t encryptedkeysize, const uint8_t *encryptedkey);
  362 int clear_dumper(struct thread *td);
  363 
  364 int dump_start(struct dumperinfo *di, struct kerneldumpheader *kdh);
  365 int dump_append(struct dumperinfo *, void *, vm_offset_t, size_t);
  366 int dump_write(struct dumperinfo *, void *, vm_offset_t, off_t, size_t);
  367 int dump_finish(struct dumperinfo *di, struct kerneldumpheader *kdh);
  368 void dump_init_header(const struct dumperinfo *di, struct kerneldumpheader *kdh,
  369     char *magic, uint32_t archver, uint64_t dumplen);
  370 
  371 #endif /* _KERNEL */
  372 
  373 #endif /* !_SYS_CONF_H_ */

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