/* $OpenBSD: ramdisk.h,v 1.5 2002/03/14 01:26:52 millert Exp $ */ /* $NetBSD: ramdisk.h,v 1.4 1996/03/22 23:02:04 gwr 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * 4. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Gordon W. Ross * * 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. */ /* * RAM-disk ioctl functions: */ #include <sys/ioccom.h> struct rd_conf { caddr_t rd_addr; size_t rd_size; int rd_type; }; #define RD_GETCONF _IOR('r', 0, struct rd_conf) /* get unit config */ #define RD_SETCONF _IOW('r', 1, struct rd_conf) /* set unit config */ /* * There are three configurations supported for each unit, * reflected in the value of the rd_type field: */ #define RD_UNCONFIGURED 0 /* * Not yet configured. Open returns ENXIO. */ #define RD_KMEM_FIXED 1 /* * Disk image resident in kernel (patched in or loaded). * Requires that the function: rd_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 RD_OPEN_HOOK option. * No attempt will ever be made to free this memory. */ #define RD_KMEM_ALLOCATED 2 /* * Small, wired-down chunk of kernel memory obtained from * kmem_alloc(). The allocation is performed by an ioctl * call on the "control" unit (regular unit + 16) */ #define RD_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 control device 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: * option RAMDISK_SERVER=0 */ #ifdef _KERNEL /* * If the option RAMDISK_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 rd_attach_hook(int unit, struct rd_conf *); extern void rd_open_hook(int unit, struct rd_conf *); #endif