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/dev/md.h

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    1 /*      $NetBSD: md.h,v 1.7 2001/07/02 17:17:25 uch Exp $       */
    2 
    3 /*
    4  * Copyright (c) 1995 Gordon W. Ross
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission.
   17  * 4. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed by Gordon W. Ross
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * Memory-disk ioctl functions:
   35  */
   36 
   37 #include <sys/ioccom.h>
   38 
   39 struct md_conf {
   40         caddr_t md_addr;
   41         size_t  md_size;
   42         int     md_type;
   43 };
   44 
   45 #define MD_GETCONF      _IOR('r', 0, struct md_conf)    /* get unit config */
   46 #define MD_SETCONF      _IOW('r', 1, struct md_conf)    /* set unit config */
   47 
   48 /*
   49  * There are three configurations supported for each unit,
   50  * reflected in the value of the md_type field:
   51  */
   52 #define MD_UNCONFIGURED 0
   53 /*
   54  *     Not yet configured.  Open returns ENXIO.
   55  */
   56 #define MD_KMEM_FIXED   1
   57 /*
   58  *     Disk image resident in kernel (patched in or loaded).
   59  *     Requires that the function: md_set_kmem() is called to
   60  *     attach the (initialized) kernel memory to be used by the
   61  *     device.  It can be initialized by an "open hook" if this
   62  *     driver is compiled with the MD_OPEN_HOOK option.
   63  *     No attempt will ever be made to free this memory.
   64  */
   65 #define MD_KMEM_ALLOCATED 2
   66 /*
   67  *     Small, wired-down chunk of kernel memory obtained from
   68  *     kmem_alloc().  The allocation is performed by an ioctl
   69  *     call on the raw partition.
   70  */
   71 #define MD_UMEM_SERVER 3
   72 /*
   73  *     Indirect access to user-space of a user-level server.
   74  *     (Like the MFS hack, but better! 8^)  Device operates
   75  *     only while the server has the raw partition open and
   76  *     continues to service I/O requests.  The process that
   77  *     does this setconf will become the I/O server.  This
   78  *     configuration type can be disabled using:
   79  *         options  MEMORY_DISK_SERVER=0
   80  */
   81 
   82 #ifdef  _KERNEL
   83 /*
   84  * If the option MEMORY_DISK_HOOKS is on, then these functions are
   85  * called by the ramdisk driver to allow machine-dependent to
   86  * match/configure and/or load each ramdisk unit.
   87  */
   88 extern void md_attach_hook(int, struct md_conf *);
   89 extern void md_open_hook(int, struct md_conf *);
   90 #ifdef MEMORY_DISK_DYNAMIC
   91 extern void md_root_setconf(char *, size_t);
   92 #endif
   93 #endif /* _KERNEL */

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