75 lines
3.0 KiB
C
75 lines
3.0 KiB
C
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/*
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* Copyright (c) 1991-1993 Regents of the University of California.
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* All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* From: Header: audiovar.h,v 1.3 93/07/18 14:07:25 mccanne Exp (LBL)
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* $Id: bsd_audiovar.h,v 1.1 1994/01/09 19:35:05 cgd Exp $
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*/
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#define AUCB_SIZE 4096
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#define AUCB_MOD(k) ((k) & (AUCB_SIZE - 1))
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#define AUCB_INIT(cb) ((cb)->cb_head = (cb)->cb_tail = (cb)->cb_drops = \
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(cb)->cb_pdrops = (cb)->cb_tdrops = (cb)->cb_cc = 0)
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#define AUCB_EMPTY(cb) ((cb)->cb_head == (cb)->cb_tail)
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#define AUCB_FULL(cb) (AUCB_MOD((cb)->cb_tail + 1) == (cb)->cb_head)
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#define AUCB_LEN(cb) (AUCB_MOD((cb)->cb_tail - (cb)->cb_head))
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#define MAXBLKSIZE (AUCB_SIZE / 2)
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#define DEFBLKSIZE 128
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#ifndef LOCORE
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/*
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* aucb's are used for communication between the trap handler and
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* the software interrupt.
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*/
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struct aucb {
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int cb_thresh; /* threshold for wakeup */
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u_char *cb_cp;
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u_char *cb_bp;
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u_char *cb_ep;
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};
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struct auio {
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u_long au_stamp; /* time stamp */
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int au_lowat; /* xmit low water mark (for wakeup) */
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int au_hiwat; /* xmit high water mark (for wakeup) */
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int au_blksize; /* recv block (chunk) size */
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int au_backlog; /* # samples of xmit backlog to gen. */
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#ifdef notdef
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struct aucb au_rb; /* read (recv) buffer */
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struct aucb au_wb; /* write (xmit) buffer */
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#endif
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struct aucb au_cb;
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};
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#endif
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