1 /* $OpenBSD: ramdisk.h,v 1.5 2002/03/14 01:26:52 millert Exp $ */ 2 /* $NetBSD: ramdisk.h,v 1.4 1996/03/22 23:02:04 gwr Exp $ */ 3 4 /* 5 * Copyright (c) 1995 Gordon W. Ross 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 4. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Gordon W. Ross 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * RAM-disk ioctl functions: 36 */ 37 38 #include <sys/ioccom.h> 39 40 struct rd_conf { 41 caddr_t rd_addr; 42 size_t rd_size; 43 int rd_type; 44 }; 45 46 #define RD_GETCONF _IOR('r', 0, struct rd_conf) /* get unit config */ 47 #define RD_SETCONF _IOW('r', 1, struct rd_conf) /* set unit config */ 48 49 /* 50 * There are three configurations supported for each unit, 51 * reflected in the value of the rd_type field: 52 */ 53 #define RD_UNCONFIGURED 0 54 /* 55 * Not yet configured. Open returns ENXIO. 56 */ 57 #define RD_KMEM_FIXED 1 58 /* 59 * Disk image resident in kernel (patched in or loaded). 60 * Requires that the function: rd_set_kmem() is called to 61 * attach the (initialized) kernel memory to be used by the 62 * device. It can be initialized by an "open hook" if this 63 * driver is compiled with the RD_OPEN_HOOK option. 64 * No attempt will ever be made to free this memory. 65 */ 66 #define RD_KMEM_ALLOCATED 2 67 /* 68 * Small, wired-down chunk of kernel memory obtained from 69 * kmem_alloc(). The allocation is performed by an ioctl 70 * call on the "control" unit (regular unit + 16) 71 */ 72 #define RD_UMEM_SERVER 3 73 /* 74 * Indirect access to user-space of a user-level server. 75 * (Like the MFS hack, but better! 8^) Device operates 76 * only while the server has the control device open and 77 * continues to service I/O requests. The process that 78 * does this setconf will become the I/O server. This 79 * configuration type can be disabled using: 80 * option RAMDISK_SERVER=0 81 */ 82 83 #ifdef _KERNEL 84 /* 85 * If the option RAMDISK_HOOKS is on, then these functions are 86 * called by the ramdisk driver to allow machine-dependent to 87 * match/configure and/or load each ramdisk unit. 88 */ 89 extern void rd_attach_hook(int unit, struct rd_conf *); 90 extern void rd_open_hook(int unit, struct rd_conf *); 91 #endif 92