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
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