/*
* 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);
