FreeBSD/Linux Kernel Cross Reference
sys/dev/md.h

     /*      $NetBSD: md.h,v 1.11 2009/12/14 03:11:22 uebayasi Exp $ */
     
     /*
      * Copyright (c) 1995 Gordon W. Ross
      * All rights reserved.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
     */
    
    #ifndef _SYS_DEV_MD_H_
    #define _SYS_DEV_MD_H_
    
    /*
     * Memory-disk ioctl functions:
     */
    
    #include <sys/ioccom.h>
    
    struct md_conf {
            void *md_addr;
            size_t  md_size;
            int     md_type;
    };
    
    #define MD_GETCONF      _IOR('r', 0, struct md_conf)    /* get unit config */
    #define MD_SETCONF      _IOW('r', 1, struct md_conf)    /* set unit config */
    
    /*
     * There are three configurations supported for each unit,
     * reflected in the value of the md_type field:
     */
    #define MD_UNCONFIGURED 0
    /*
     *     Not yet configured.  Open returns ENXIO.
     */
    #define MD_KMEM_FIXED   1
    /*
     *     Disk image resident in kernel (patched in or loaded).
     *     Requires that the function: md_set_kmem() is called to
     *     attach the (initialized) kernel memory to be used by the
     *     device.  It can be initialized by an "open hook" if this
     *     driver is compiled with the MD_OPEN_HOOK option.
     *     No attempt will ever be made to free this memory.
     */
    #define MD_KMEM_ALLOCATED 2
    /*
     *     Small, wired-down chunk of kernel memory obtained from
     *     kmem_alloc().  The allocation is performed by an ioctl
     *     call on the raw partition.
     */
    #define MD_UMEM_SERVER 3
    /*
     *     Indirect access to user-space of a user-level server.
     *     (Like the MFS hack, but better! 8^)  Device operates
     *     only while the server has the raw partition open and
     *     continues to service I/O requests.  The process that
     *     does this setconf will become the I/O server.  This
     *     configuration type can be disabled using:
     *         options  MEMORY_DISK_SERVER=0
     */
    
    #ifdef  _KERNEL
    /*
     * If the option MEMORY_DISK_HOOKS is on, then these functions are
     * called by the ramdisk driver to allow machine-dependent to
     * match/configure and/or load each ramdisk unit.
     */
    extern void md_attach_hook(int, struct md_conf *);
    extern void md_open_hook(int, struct md_conf *);
    extern void md_root_setconf(char *, size_t);
    
    extern int md_is_root;
    #endif /* _KERNEL */
    
    #endif /* _SYS_DEV_MD_H_ */

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