FreeBSD/Linux Kernel Cross Reference
sys/sys/conf.h

     /*-
      * Copyright (c) 1990, 1993
      *      The Regents of the University of California.  All rights reserved.
      * Copyright (c) 2000
      *      Poul-Henning Kamp.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)conf.h      8.5 (Berkeley) 1/9/95
     * $FreeBSD: releng/5.0/sys/sys/conf.h 108007 2002-12-17 22:36:33Z mckusick $
     */
    
    #ifndef _SYS_CONF_H_
    #define _SYS_CONF_H_
    
    #ifdef _KERNEL
    #include <sys/eventhandler.h>
    
    struct tty;
    struct disk;
    struct vnode;
    struct buf;
    TAILQ_HEAD(snaphead, inode);
    
    struct cdev {
            u_int           si_flags;
    #define SI_STASHED      0x0001  /* created in stashed storage */
    #define SI_ALIAS        0x0002  /* carrier of alias name */
    #define SI_NAMED        0x0004  /* make_dev{_alias} has been called */
    #define SI_CHEAPCLONE   0x0008  /* can be removed_dev'ed when vnode reclaims */
    #define SI_CHILD        0x0010  /* child of another dev_t */
    #define SI_DEVOPEN      0x0020  /* opened by device */
    #define SI_CONSOPEN     0x0040  /* opened by console */
    #define SI_DUMPDEV      0x0080  /* is kernel dumpdev */
            struct timespec si_atime;
            struct timespec si_ctime;
            struct timespec si_mtime;
            udev_t          si_udev;
            LIST_ENTRY(cdev)        si_hash;
            SLIST_HEAD(, vnode)     si_hlist;
            LIST_HEAD(, cdev)       si_children;
            LIST_ENTRY(cdev)        si_siblings;
            dev_t           si_parent;
            u_int           si_inode;
            char            si_name[SPECNAMELEN + 1];
            void            *si_drv1, *si_drv2;
            struct cdevsw   *si_devsw;
            int             si_iosize_max;  /* maximum I/O size (for physio &al) */
            uid_t           si_uid;
            gid_t           si_gid;
            mode_t          si_mode;
            u_long          si_usecount;
            union {
                    struct {
                            struct tty *__sit_tty;
                    } __si_tty;
                    struct {
                            struct disk *__sid_disk;
                            struct mount *__sid_mountpoint;
                            int __sid_bsize_phys; /* min physical block size */
                            int __sid_bsize_best; /* optimal block size */
                            struct snaphead __sid_snapshots;
                            daddr_t __sid_snaplistsize; /* size of snapblklist. */
                            daddr_t *__sid_snapblklist; /* known snapshot blocks. */
                            int (*__sid_copyonwrite)(struct vnode *, struct buf *);
                    } __si_disk;
            } __si_u;
    };
   
   #define si_tty          __si_u.__si_tty.__sit_tty
   #define si_disk         __si_u.__si_disk.__sid_disk
   #define si_mountpoint   __si_u.__si_disk.__sid_mountpoint
   #define si_bsize_phys   __si_u.__si_disk.__sid_bsize_phys
   #define si_bsize_best   __si_u.__si_disk.__sid_bsize_best
   #define si_snapshots    __si_u.__si_disk.__sid_snapshots
   #define si_snaplistsize __si_u.__si_disk.__sid_snaplistsize
   #define si_snapblklist  __si_u.__si_disk.__sid_snapblklist
   #define si_copyonwrite  __si_u.__si_disk.__sid_copyonwrite
   
   /*
    * Special device management
    */
   #define SPECHSZ 64
   #define SPECHASH(rdev)  (((unsigned)(minor(rdev)))%SPECHSZ)
   
   /*
    * Definitions of device driver entry switches
    */
   
   struct bio;
   struct buf;
   struct thread;
   struct uio;
   struct knote;
   
   /*
    * Note: d_thread_t is provided as a transition aid for those drivers
    * that treat struct proc/struct thread as an opaque data type and
    * exist in substantially the same form in both 4.x and 5.x.  Writers
    * of drivers that dips into the d_thread_t structure should use
    * struct thread or struct proc as appropriate for the version of the
    * OS they are using.  It is provided in lieu of each device driver
    * inventing its own way of doing this.  While it does violate style(9)
    * in a number of ways, this violation is deemed to be less
    * important than the benefits that a uniform API between releases
    * gives.
    *
    * Users of struct thread/struct proc that aren't device drivers should
    * not use d_thread_t.
    */
   
   typedef struct thread d_thread_t;
   
   typedef int d_open_t(dev_t dev, int oflags, int devtype, struct thread *td);
   typedef int d_close_t(dev_t dev, int fflag, int devtype, struct thread *td);
   typedef void d_strategy_t(struct bio *bp);
   typedef int d_ioctl_t(dev_t dev, u_long cmd, caddr_t data,
                         int fflag, struct thread *td);
   typedef int d_dump_t(dev_t dev,void *virtual, vm_offset_t physical, off_t offset, size_t length);
   typedef int d_psize_t(dev_t dev);
   
   typedef int d_read_t(dev_t dev, struct uio *uio, int ioflag);
   typedef int d_write_t(dev_t dev, struct uio *uio, int ioflag);
   typedef int d_poll_t(dev_t dev, int events, struct thread *td);
   typedef int d_kqfilter_t(dev_t dev, struct knote *kn);
   typedef int d_mmap_t(dev_t dev, vm_offset_t offset, int nprot);
   
   typedef int l_open_t(dev_t dev, struct tty *tp);
   typedef int l_close_t(struct tty *tp, int flag);
   typedef int l_read_t(struct tty *tp, struct uio *uio, int flag);
   typedef int l_write_t(struct tty *tp, struct uio *uio, int flag);
   typedef int l_ioctl_t(struct tty *tp, u_long cmd, caddr_t data,
                         int flag, struct thread *td);
   typedef int l_rint_t(int c, struct tty *tp);
   typedef int l_start_t(struct tty *tp);
   typedef int l_modem_t(struct tty *tp, int flag);
   
   /*
    * XXX: The dummy argument can be used to do what strategy1() never
    * did anywhere:  Create a per device flag to lock the device during
    * label/slice surgery, all calls with a dummy == 0 gets stalled on
    * a queue somewhere, whereas dummy == 1 are let through.  Once out
    * of surgery, reset the flag and restart all the stuff on the stall
    * queue.
    */
   #define BIO_STRATEGY(bp, dummy)                                         \
           do {                                                            \
           if ((!(bp)->bio_cmd) || ((bp)->bio_cmd & ((bp)->bio_cmd - 1)))  \
                   Debugger("bio_cmd botch");                              \
           (*devsw((bp)->bio_dev)->d_strategy)(bp);                        \
           } while (0)
   
   #define DEV_STRATEGY(bp, dummy)                                         \
           do {                                                            \
           if ((bp)->b_flags & B_PHYS)                                     \
                   (bp)->b_io.bio_offset = (bp)->b_offset;                 \
           else                                                            \
                   (bp)->b_io.bio_offset = dbtob((bp)->b_blkno);           \
           (bp)->b_io.bio_done = bufdonebio;                               \
           (bp)->b_io.bio_caller2 = (bp);                                  \
           BIO_STRATEGY(&(bp)->b_io, dummy);                               \
           } while (0)
   
   #endif /* _KERNEL */
   
   /*
    * Types for d_flags.
    */
   #define D_TAPE  0x0001
   #define D_DISK  0x0002
   #define D_TTY   0x0004
   #define D_MEM   0x0008
   
   #ifdef _KERNEL 
   
   #define D_TYPEMASK      0xffff
   
   /*
    * Flags for d_flags.
    */
   #define D_MEMDISK       0x00010000      /* memory type disk */
   #define D_NAGGED        0x00020000      /* nagged about missing make_dev() */
   #define D_CANFREE       0x00040000      /* can free blocks */
   #define D_TRACKCLOSE    0x00080000      /* track all closes */
   #define D_MMAP_ANON     0x00100000      /* special treatment in vm_mmap.c */
   #define D_KQFILTER      0x00200000      /* has kqfilter entry */
   #define D_NOGIANT       0x00400000      /* Doesn't want Giant */
   
   /*
    * Character device switch table
    */
   struct cdevsw {
           d_open_t        *d_open;
           d_close_t       *d_close;
           d_read_t        *d_read;
           d_write_t       *d_write;
           d_ioctl_t       *d_ioctl;
           d_poll_t        *d_poll;
           d_mmap_t        *d_mmap;
           d_strategy_t    *d_strategy;
           const char      *d_name;        /* base device name, e.g. 'vn' */
           int             d_maj;
           d_dump_t        *d_dump;
           d_psize_t       *d_psize;
           u_int           d_flags;
           /* additions below are not binary compatible with 4.2 and below */
           d_kqfilter_t    *d_kqfilter;
   };
   
   /*
    * Line discipline switch table
    */
   struct linesw {
           l_open_t        *l_open;
           l_close_t       *l_close;
           l_read_t        *l_read;
           l_write_t       *l_write;
           l_ioctl_t       *l_ioctl;
           l_rint_t        *l_rint;
           l_start_t       *l_start;
           l_modem_t       *l_modem;
           u_char          l_hotchar;
   };
   
   extern struct linesw linesw[];
   extern int nlinesw;
   
   int ldisc_register(int , struct linesw *);
   void ldisc_deregister(int);
   #define LDISC_LOAD      -1              /* Loadable line discipline */
   #endif /* _KERNEL */
   
   /*
    * Swap device table
    */
   struct swdevt {
           udev_t  sw_dev;                 /* For quasibogus swapdev reporting */
           int     sw_flags;
           int     sw_nblks;
           int     sw_used;
           struct  vnode *sw_vp;
           dev_t   sw_device;
   };
   #define SW_FREED        0x01
   #define SW_SEQUENTIAL   0x02
   #define sw_freed        sw_flags        /* XXX compat */
   
   #ifdef _KERNEL
   d_open_t        noopen;
   d_close_t       noclose;
   d_read_t        noread;
   d_write_t       nowrite;
   d_ioctl_t       noioctl;
   d_mmap_t        nommap;
   d_kqfilter_t    nokqfilter;
   #define nostrategy      ((d_strategy_t *)NULL)
   #define nopoll  seltrue
   
   d_dump_t        nodump;
   
   #define NUMCDEVSW 256
   
   /*
    * nopsize is little used, so not worth having dummy functions for.
    */
   #define nopsize ((d_psize_t *)NULL)
   
   d_open_t        nullopen;
   d_close_t       nullclose;
   
   l_ioctl_t       l_nullioctl;
   l_read_t        l_noread;
   l_write_t       l_nowrite;
   
   struct module;
   
   struct devsw_module_data {
           int     (*chainevh)(struct module *, int, void *); /* next handler */
           void    *chainarg;      /* arg for next event handler */
           /* Do not initialize fields hereafter */
   };
   
   #define DEV_MODULE(name, evh, arg)                                      \
   static moduledata_t name##_mod = {                                      \
       #name,                                                              \
       evh,                                                                \
       arg                                                                 \
   };                                                                      \
   DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
   
   
   int     cdevsw_add(struct cdevsw *_new);
   int     cdevsw_remove(struct cdevsw *_old);
   int     count_dev(dev_t _dev);
   void    destroy_dev(dev_t _dev);
   void    revoke_and_destroy_dev(dev_t _dev);
   struct cdevsw *devsw(dev_t _dev);
   const char *devtoname(dev_t _dev);
   int     dev_named(dev_t _pdev, const char *_name);
   void    dev_depends(dev_t _pdev, dev_t _cdev);
   void    freedev(dev_t _dev);
   int     iszerodev(dev_t _dev);
   dev_t   makebdev(int _maj, int _min);
   dev_t   make_dev(struct cdevsw *_devsw, int _minor, uid_t _uid, gid_t _gid,
                   int _perms, const char *_fmt, ...) __printflike(6, 7);
   dev_t   make_dev_alias(dev_t _pdev, const char *_fmt, ...) __printflike(2, 3);
   int     dev2unit(dev_t _dev);
   int     unit2minor(int _unit);
   void    setconf(void);
   dev_t   getdiskbyname(char *_name);
   
   /* This is type of the function DEVFS uses to hook into the kernel with */
   typedef void devfs_create_t(dev_t dev);
   typedef void devfs_destroy_t(dev_t dev);
   
   extern devfs_create_t *devfs_create_hook;
   extern devfs_destroy_t *devfs_destroy_hook;
   extern int devfs_present;
   
   #define         UID_ROOT        0
   #define         UID_BIN         3
   #define         UID_UUCP        66
   
   #define         GID_WHEEL       0
   #define         GID_KMEM        2
   #define         GID_OPERATOR    5
   #define         GID_BIN         7
   #define         GID_GAMES       13
   #define         GID_DIALER      68
   
   typedef void (*dev_clone_fn)(void *arg, char *name, int namelen, dev_t *result);
   
   int dev_stdclone(char *_name, char **_namep, const char *_stem, int *_unit);
   EVENTHANDLER_DECLARE(dev_clone, dev_clone_fn);
   
   /* Stuff relating to kernel-dump */
   
   typedef int dumper_t(
           void *priv,             /* Private to the driver. */
           void *virtual,          /* Virtual (mapped) address. */
           vm_offset_t physical,   /* Physical address of virtual. */
           off_t offset,           /* Byte-offset to write at. */
           size_t length);         /* Number of bytes to dump. */
   
   struct dumperinfo {
           dumper_t *dumper;       /* Dumping function. */
           void    *priv;          /* Private parts. */
           u_int   blocksize;      /* Size of block in bytes. */
           off_t   mediaoffset;    /* Initial offset in bytes. */
           off_t   mediasize;      /* Space available in bytes. */
   };
   
   int set_dumper(struct dumperinfo *);
   void dumpsys(struct dumperinfo *);
   extern int dumping;             /* system is dumping */
   
   #endif /* _KERNEL */
   
   #endif /* !_SYS_CONF_H_ */

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