1 /* $NetBSD: timervar.h,v 1.2 2002/11/28 14:18:31 pk Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * All advertising materials mentioning features or use of this software 12 * must display the following acknowledgement: 13 * This product includes software developed by the University of 14 * California, Lawrence Berkeley Laboratory. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. All advertising materials mentioning features or use of this software 25 * must display the following acknowledgement: 26 * This product includes software developed by the University of 27 * California, Berkeley and its contributors. 28 * 4. Neither the name of the University nor the names of its contributors 29 * may be used to endorse or promote products derived from this software 30 * without specific prior written permission. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 */ 44 45 #include "opt_sparc_arch.h" 46 47 #if defined(SUN4) || defined(SUN4C) 48 int clockintr_4(void *); 49 int statintr_4(void *); 50 void timer_init_4(void); 51 52 void timerattach_obio_4(struct device *, struct device *, void *); 53 void timerattach_mainbus_4c(struct device *, struct device *, void *); 54 #endif /* SUN4 || SUN4C */ 55 56 #if defined(SUN4M) 57 int clockintr_4m(void *); 58 int statintr_4m(void *); 59 void timer_init_4m(void); 60 61 void timerattach_obio_4m(struct device *, struct device *, void *); 62 #endif /* SUN4M */ 63 64 /* Imported from clock.c: */ 65 extern int statvar, statmin, statint; 66 extern int timerblurb; 67 extern void (*timer_init)(void); 68 69 /* Common timer attach routine in timer.c: */ 70 void timerattach(volatile int *, volatile int *); 71 72 static __inline u_long __attribute__((__unused__)) 73 new_interval(void) 74 { 75 u_long newint, r, var; 76 77 /* 78 * Compute new randomized interval. The intervals are uniformly 79 * distributed on [statint - statvar / 2, statint + statvar / 2], 80 * and therefore have mean statint, giving a stathz frequency clock. 81 */ 82 var = statvar; 83 do { 84 r = random() & (var - 1); 85 } while (r == 0); 86 newint = statmin + r; 87 return (newint); 88 } 89