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Annotation of sys/dev/ramdisk.h, Revision 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