1 /* $NetBSD: md.h,v 1.11 2009/12/14 03:11:22 uebayasi 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef _SYS_DEV_MD_H_ 29 #define _SYS_DEV_MD_H_ 30 31 /* 32 * Memory-disk ioctl functions: 33 */ 34 35 #include <sys/ioccom.h> 36 37 struct md_conf { 38 void *md_addr; 39 size_t md_size; 40 int md_type; 41 }; 42 43 #define MD_GETCONF _IOR('r', 0, struct md_conf) /* get unit config */ 44 #define MD_SETCONF _IOW('r', 1, struct md_conf) /* set unit config */ 45 46 /* 47 * There are three configurations supported for each unit, 48 * reflected in the value of the md_type field: 49 */ 50 #define MD_UNCONFIGURED 0 51 /* 52 * Not yet configured. Open returns ENXIO. 53 */ 54 #define MD_KMEM_FIXED 1 55 /* 56 * Disk image resident in kernel (patched in or loaded). 57 * Requires that the function: md_set_kmem() is called to 58 * attach the (initialized) kernel memory to be used by the 59 * device. It can be initialized by an "open hook" if this 60 * driver is compiled with the MD_OPEN_HOOK option. 61 * No attempt will ever be made to free this memory. 62 */ 63 #define MD_KMEM_ALLOCATED 2 64 /* 65 * Small, wired-down chunk of kernel memory obtained from 66 * kmem_alloc(). The allocation is performed by an ioctl 67 * call on the raw partition. 68 */ 69 #define MD_UMEM_SERVER 3 70 /* 71 * Indirect access to user-space of a user-level server. 72 * (Like the MFS hack, but better! 8^) Device operates 73 * only while the server has the raw partition open and 74 * continues to service I/O requests. The process that 75 * does this setconf will become the I/O server. This 76 * configuration type can be disabled using: 77 * options MEMORY_DISK_SERVER=0 78 */ 79 80 #ifdef _KERNEL 81 /* 82 * If the option MEMORY_DISK_HOOKS is on, then these functions are 83 * called by the ramdisk driver to allow machine-dependent to 84 * match/configure and/or load each ramdisk unit. 85 */ 86 extern void md_attach_hook(int, struct md_conf *); 87 extern void md_open_hook(int, struct md_conf *); 88 extern void md_root_setconf(char *, size_t); 89 90 extern int md_is_root; 91 #endif /* _KERNEL */ 92 93 #endif /* _SYS_DEV_MD_H_ */ 94