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      1 /*	$NetBSD: md.h,v 1.11 2009/12/14 03:11:22 uebayasi 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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef _SYS_DEV_MD_H_
     29 #define _SYS_DEV_MD_H_
     30 
     31 /*
     32  * Memory-disk ioctl functions:
     33  */
     34 
     35 #include <sys/ioccom.h>
     36 
     37 struct md_conf {
     38 	void *md_addr;
     39 	size_t  md_size;
     40 	int     md_type;
     41 };
     42 
     43 #define MD_GETCONF	_IOR('r', 0, struct md_conf)	/* get unit config */
     44 #define MD_SETCONF	_IOW('r', 1, struct md_conf)	/* set unit config */
     45 
     46 /*
     47  * There are three configurations supported for each unit,
     48  * reflected in the value of the md_type field:
     49  */
     50 #define MD_UNCONFIGURED 0
     51 /*
     52  *     Not yet configured.  Open returns ENXIO.
     53  */
     54 #define MD_KMEM_FIXED	1
     55 /*
     56  *     Disk image resident in kernel (patched in or loaded).
     57  *     Requires that the function: md_set_kmem() is called to
     58  *     attach the (initialized) kernel memory to be used by the
     59  *     device.  It can be initialized by an "open hook" if this
     60  *     driver is compiled with the MD_OPEN_HOOK option.
     61  *     No attempt will ever be made to free this memory.
     62  */
     63 #define MD_KMEM_ALLOCATED 2
     64 /*
     65  *     Small, wired-down chunk of kernel memory obtained from
     66  *     kmem_alloc().  The allocation is performed by an ioctl
     67  *     call on the raw partition.
     68  */
     69 #define MD_UMEM_SERVER 3
     70 /*
     71  *     Indirect access to user-space of a user-level server.
     72  *     (Like the MFS hack, but better! 8^)  Device operates
     73  *     only while the server has the raw partition open and
     74  *     continues to service I/O requests.  The process that
     75  *     does this setconf will become the I/O server.  This
     76  *     configuration type can be disabled using:
     77  *         options  MEMORY_DISK_SERVER=0
     78  */
     79 
     80 #ifdef	_KERNEL
     81 /*
     82  * If the option MEMORY_DISK_HOOKS is on, then these functions are
     83  * called by the ramdisk driver to allow machine-dependent to
     84  * match/configure and/or load each ramdisk unit.
     85  */
     86 extern void md_attach_hook(int, struct md_conf *);
     87 extern void md_open_hook(int, struct md_conf *);
     88 extern void md_root_setconf(char *, size_t);
     89 
     90 extern int md_is_root;
     91 #endif /* _KERNEL */
     92 
     93 #endif /* _SYS_DEV_MD_H_ */
     94