| 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 | |