94 lines
3.3 KiB
C
94 lines
3.3 KiB
C
/* $NetBSD: md.h,v 1.11 2009/12/14 03:11:22 uebayasi Exp $ */
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/*
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* Copyright (c) 1995 Gordon W. Ross
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_DEV_MD_H_
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#define _SYS_DEV_MD_H_
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/*
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* Memory-disk ioctl functions:
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*/
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#include <sys/ioccom.h>
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struct md_conf {
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void *md_addr;
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size_t md_size;
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int md_type;
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};
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#define MD_GETCONF _IOR('r', 0, struct md_conf) /* get unit config */
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#define MD_SETCONF _IOW('r', 1, struct md_conf) /* set unit config */
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/*
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* There are three configurations supported for each unit,
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* reflected in the value of the md_type field:
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*/
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#define MD_UNCONFIGURED 0
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/*
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* Not yet configured. Open returns ENXIO.
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*/
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#define MD_KMEM_FIXED 1
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/*
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* Disk image resident in kernel (patched in or loaded).
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* Requires that the function: md_set_kmem() is called to
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* attach the (initialized) kernel memory to be used by the
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* device. It can be initialized by an "open hook" if this
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* driver is compiled with the MD_OPEN_HOOK option.
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* No attempt will ever be made to free this memory.
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*/
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#define MD_KMEM_ALLOCATED 2
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/*
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* Small, wired-down chunk of kernel memory obtained from
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* kmem_alloc(). The allocation is performed by an ioctl
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* call on the raw partition.
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*/
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#define MD_UMEM_SERVER 3
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/*
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* Indirect access to user-space of a user-level server.
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* (Like the MFS hack, but better! 8^) Device operates
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* only while the server has the raw partition open and
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* continues to service I/O requests. The process that
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* does this setconf will become the I/O server. This
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* configuration type can be disabled using:
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* options MEMORY_DISK_SERVER=0
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*/
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#ifdef _KERNEL
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/*
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* If the option MEMORY_DISK_HOOKS is on, then these functions are
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* called by the ramdisk driver to allow machine-dependent to
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* match/configure and/or load each ramdisk unit.
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*/
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extern void md_attach_hook(int, struct md_conf *);
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extern void md_open_hook(int, struct md_conf *);
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extern void md_root_setconf(char *, size_t);
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extern int md_is_root;
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#endif /* _KERNEL */
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#endif /* _SYS_DEV_MD_H_ */
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