bus_private.h

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    1 /*-
    2  * Copyright (c) 1997,1998 Doug Rabson
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #ifndef _SYS_BUS_PRIVATE_H_
   30 #define _SYS_BUS_PRIVATE_H_
   31 
   32 #include <sys/bus.h>
   33 
   34 /*
   35  * Forward declarations
   36  */
   37 typedef TAILQ_HEAD(devclass_list, devclass) devclass_list_t;
   38 typedef TAILQ_HEAD(driver_list, driver) driver_list_t;
   39 typedef TAILQ_HEAD(device_list, device) device_list_t;
   40 
   41 struct devclass {
   42     TAILQ_ENTRY(devclass) link;
   43     driver_list_t       drivers; /* bus devclasses store drivers for bus */
   44     char                *name;
   45     device_t            *devices; /* array of devices indexed by unit */
   46     int                 maxunit; /* size of devices array */
   47     int                 nextunit; /* next unused unit number */
   48 };
   49 
   50 /*
   51  * Resources from config(8).
   52  */
   53 typedef enum {
   54     RES_INT, RES_STRING, RES_LONG
   55 } resource_type;
   56 
   57 struct config_resource {
   58     char                *name;
   59     resource_type       type;
   60     union {
   61         long            longval;
   62         int             intval;
   63         char*           stringval;
   64     } u;
   65 };
   66 
   67 struct config_device {
   68     char                *name;  /* e.g. "lpt", "wdc" etc */
   69     int                 unit;
   70     int                 resource_count;
   71     struct config_resource      *resources;
   72 };
   73 
   74 /*
   75  * Compiled device methods.
   76  */
   77 struct device_ops {
   78     int maxoffset;
   79     devop_t methods[1];
   80 };
   81 
   82 /*
   83  * Helpers for device method wrappers.
   84  */
   85 #define DEVOPDESC(OP)   (&OP##_##desc)
   86 
   87 #define DEVOPOFF(DEV, OP)                               \
   88         ((DEVOPDESC(OP)->offset >= DEV->ops->maxoffset  \
   89           || !DEV->ops->methods[DEVOPDESC(OP)->offset]) \
   90          ? 0 : DEVOPDESC(OP)->offset)
   91 
   92 #define DEVOPMETH(DEV, OP) (DEV->ops->methods[DEVOPOFF(DEV, OP)])
   93 
   94 /*
   95  * Implementation of device.
   96  */
   97 struct device {
   98     /*
   99      * Device hierarchy.
  100      */
  101     TAILQ_ENTRY(device) link;   /* list of devices in parent */
  102     device_t            parent;
  103     device_list_t       children; /* list of subordinate devices */
  104 
  105     /*
  106      * Details of this device.
  107      */
  108     device_ops_t        ops;
  109     driver_t            *driver;
  110     devclass_t          devclass; /* device class which we are in */
  111     int                 unit;
  112     const char*         desc;   /* driver specific description */
  113     int                 busy;   /* count of calls to device_busy() */
  114     device_state_t      state;
  115     int                 flags;
  116 #define DF_ENABLED      1       /* device should be probed/attached */
  117 #define DF_FIXEDCLASS   2       /* devclass specified at create time */
  118 #define DF_WILDCARD     4       /* unit was originally wildcard */
  119     void                *ivars;
  120     void                *softc;
  121 };
  122 
  123 struct device_op_desc {
  124     unsigned int        offset; /* offset in driver ops */
  125     const char*         name;   /* unique name (for registration) */
  126 };
  127 
  128 #endif /* !_SYS_BUS_PRIVATE_H_ */

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

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sys/sys/bus_private.h