1 /* $NetBSD: md.h,v 1.7 2001/07/02 17:17:25 uch 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 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 4. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Gordon W. Ross 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Memory-disk ioctl functions: 35 */ 36 37 #include <sys/ioccom.h> 38 39 struct md_conf { 40 caddr_t md_addr; 41 size_t md_size; 42 int md_type; 43 }; 44 45 #define MD_GETCONF _IOR('r', 0, struct md_conf) /* get unit config */ 46 #define MD_SETCONF _IOW('r', 1, struct md_conf) /* set unit config */ 47 48 /* 49 * There are three configurations supported for each unit, 50 * reflected in the value of the md_type field: 51 */ 52 #define MD_UNCONFIGURED 0 53 /* 54 * Not yet configured. Open returns ENXIO. 55 */ 56 #define MD_KMEM_FIXED 1 57 /* 58 * Disk image resident in kernel (patched in or loaded). 59 * Requires that the function: md_set_kmem() is called to 60 * attach the (initialized) kernel memory to be used by the 61 * device. It can be initialized by an "open hook" if this 62 * driver is compiled with the MD_OPEN_HOOK option. 63 * No attempt will ever be made to free this memory. 64 */ 65 #define MD_KMEM_ALLOCATED 2 66 /* 67 * Small, wired-down chunk of kernel memory obtained from 68 * kmem_alloc(). The allocation is performed by an ioctl 69 * call on the raw partition. 70 */ 71 #define MD_UMEM_SERVER 3 72 /* 73 * Indirect access to user-space of a user-level server. 74 * (Like the MFS hack, but better! 8^) Device operates 75 * only while the server has the raw partition open and 76 * continues to service I/O requests. The process that 77 * does this setconf will become the I/O server. This 78 * configuration type can be disabled using: 79 * options MEMORY_DISK_SERVER=0 80 */ 81 82 #ifdef _KERNEL 83 /* 84 * If the option MEMORY_DISK_HOOKS is on, then these functions are 85 * called by the ramdisk driver to allow machine-dependent to 86 * match/configure and/or load each ramdisk unit. 87 */ 88 extern void md_attach_hook(int, struct md_conf *); 89 extern void md_open_hook(int, struct md_conf *); 90 #ifdef MEMORY_DISK_DYNAMIC 91 extern void md_root_setconf(char *, size_t); 92 #endif 93 #endif /* _KERNEL */ 94