Return to ramdisk.h CVS log

Up to [local] / sys / dev

Annotation of sys/dev/ramdisk.h, Revision 1.1.1.1

1.1       nbrk        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