155103Storek /* 255103Storek * Copyright (c) 1992 The Regents of the University of California. 355103Storek * All rights reserved. 455103Storek * 555103Storek * This software was developed by the Computer Systems Engineering group 655103Storek * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 755103Storek * contributed to Berkeley. 855103Storek * 9*55499Sbostic * All advertising materials mentioning features or use of this software 10*55499Sbostic * must display the following acknowledgement: 11*55499Sbostic * This product includes software developed by the University of 12*55499Sbostic * California, Lawrence Berkeley Laboratories. 13*55499Sbostic * 1455103Storek * %sccs.include.redist.c% 1555103Storek * 16*55499Sbostic * @(#)bsd_audiovar.h 7.2 (Berkeley) 07/21/92 1755103Storek * 1855103Storek * from: $Header: bsd_audiovar.h,v 1.4 92/07/03 23:23:12 mccanne Exp $ (LBL) 1955103Storek */ 2055103Storek 2155103Storek #define AUCB_SIZE 4096 2255103Storek #define AUCB_MOD(k) ((k) & (AUCB_SIZE - 1)) 2355103Storek 2455103Storek #define AUCB_INIT(cb) ((cb)->cb_head = (cb)->cb_tail = (cb)->cb_drops = \ 2555103Storek (cb)->cb_pdrops = 0) 2655103Storek 2755103Storek #define AUCB_EMPTY(cb) ((cb)->cb_head == (cb)->cb_tail) 2855103Storek #define AUCB_FULL(cb) (AUCB_MOD((cb)->cb_tail + 1) == (cb)->cb_head) 2955103Storek #define AUCB_LEN(cb) (AUCB_MOD((cb)->cb_tail - (cb)->cb_head)) 3055103Storek 3155103Storek #define MAXBLKSIZE (AUCB_SIZE / 2) 3255103Storek #define DEFBLKSIZE 128 3355103Storek 3455103Storek #ifndef LOCORE 3555103Storek /* 3655103Storek * aucb's are used for communication between the trap handler and 3755103Storek * the software interrupt. 3855103Storek */ 3955103Storek struct aucb { 4055103Storek int cb_head; /* queue head */ 4155103Storek int cb_tail; /* queue tail */ 4255103Storek int cb_thresh; /* threshold for wakeup */ 4355103Storek u_short cb_waking; /* needs wakeup at softint level */ 4455103Storek u_short cb_pause; /* io paused */ 4555103Storek u_long cb_drops; /* missed samples from over/underrun */ 4655103Storek u_long cb_pdrops; /* sun compat -- paused samples */ 4755103Storek u_char cb_data[AUCB_SIZE]; /* data buffer */ 4855103Storek }; 4955103Storek 5055103Storek #if !defined(__STDC__) && !defined(volatile) 5155103Storek #define volatile 5255103Storek #endif 5355103Storek 5455103Storek struct auio { 5555103Storek volatile struct amd7930 *au_amd;/* chip registers */ 5655103Storek u_long au_stamp; /* time stamp */ 5755103Storek int au_lowat; /* xmit low water mark (for wakeup) */ 5855103Storek int au_hiwat; /* xmit high water mark (for wakeup) */ 5955103Storek int au_blksize; /* recv block (chunk) size */ 6055103Storek struct aucb au_rb; /* read (recv) buffer */ 6155103Storek struct aucb au_wb; /* write (xmit) buffer */ 6255103Storek }; 6355103Storek #endif 64