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/firmware.h

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    1 /*-
    2  * Copyright (c) 2005, Sam Leffler <sam@errno.com>
    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 unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/6.2/sys/sys/firmware.h 164286 2006-11-14 20:42:41Z cvs2svn $
   27  */
   28 #ifndef _SYS_FIRMWARE_H_
   29 #define _SYS_FIRMWARE_H_
   30 /*
   31  * Loadable firmware support.
   32  *
   33  * Firmware images are embedded in kernel loadable modules that can
   34  * be loaded on-demand or pre-loaded as desired.  Modules may contain
   35  * one or more firmware images that are stored as opaque data arrays
   36  * and registered with a unique string name.  Consumers request
   37  * firmware by name with held references counted to use in disallowing
   38  * module/data unload.
   39  *
   40  * When multiple images are stored in one module the one image is
   41  * treated as the master with the other images holding references
   42  * to it.  This means that to unload the module each dependent/subimage
   43  * must first have its references removed.
   44  */
   45 struct firmware {
   46         const char      *name;          /* system-wide name */
   47         const void      *data;          /* location of image */
   48         size_t           datasize;      /* size of image in bytes */
   49         unsigned int     version;       /* version of the image */
   50         int              refcnt;        /* held references */
   51         struct firmware *parent;        /* not null if a subimage */
   52         linker_file_t    file;          /* loadable module */
   53 };
   54 
   55 struct firmware *firmware_register(const char *, const void *, size_t,
   56     unsigned int, struct firmware *);
   57 int              firmware_unregister(const char *);
   58 struct firmware *firmware_get(const char *);
   59 #define FIRMWARE_UNLOAD         0x0001  /* unload if unreferenced */
   60 void             firmware_put(struct firmware *, int);
   61 #endif /* _SYS_FIRMWARE_H_ */

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