88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _DEVICE_H_
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#define _DEVICE_H_
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/*
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* Devices.
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*/
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struct uio; /* in <uio.h> */
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/*
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* Filesystem-namespace-accessible device.
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*/
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struct device {
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const struct device_ops *d_ops;
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blkcnt_t d_blocks;
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blksize_t d_blocksize;
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dev_t d_devnumber; /* serial number for this device */
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void *d_data; /* device-specific data */
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};
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/*
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* Device operations.
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* devop_eachopen - called on each open call to allow denying the open
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* devop_io - for both reads and writes (the uio indicates the direction)
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* devop_ioctl - miscellaneous control operations
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*/
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struct device_ops {
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int (*devop_eachopen)(struct device *, int flags_from_open);
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int (*devop_io)(struct device *, struct uio *);
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int (*devop_ioctl)(struct device *, int op, userptr_t data);
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};
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/*
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* Macros to shorten the calling sequences.
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*/
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#define DEVOP_EACHOPEN(d, f) ((d)->d_ops->devop_eachopen(d, f))
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#define DEVOP_IO(d, u) ((d)->d_ops->devop_io(d, u))
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#define DEVOP_IOCTL(d, op, p) ((d)->d_ops->devop_ioctl(d, op, p))
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/* Create vnode for a vfs-level device. */
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struct vnode *dev_create_vnode(struct device *dev);
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/* Undo dev_create_vnode. */
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void dev_uncreate_vnode(struct vnode *vn);
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/* Initialization functions for builtin vfs-level devices. */
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void devnull_create(void);
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/* Function that kicks off device probe and attach. */
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void dev_bootstrap(void);
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#endif /* _DEVICE_H_ */
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