1 /* $NetBSD: clockvar.h,v 1.6 2005/12/11 12:22:47 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #ifndef _MVME_CLOCKVAR_H 40 #define _MVME_CLOCKVAR_H 41 42 #include <dev/clock_subr.h> 43 44 /* 45 * Definitions exported to ASIC-specific clock attachment. 46 */ 47 48 extern struct evcnt clock_profcnt; 49 extern struct evcnt clock_statcnt; 50 51 extern int clock_statvar; 52 extern int clock_statmin; 53 54 struct clock_attach_args { 55 void (*ca_initfunc)(void *, int, int); 56 long (*ca_microtime)(void *); 57 void *ca_arg; 58 }; 59 60 void clock_config(struct device *, struct clock_attach_args *, 61 struct evcnt *); 62 63 /* 64 * Macro to compute a new randomized interval. The intervals are 65 * uniformly distributed on [statint - statvar / 2, statint + statvar / 2], 66 * and therefore have mean statint, giving a stathz frequency clock. 67 * 68 * This is gratuitously stolen from sparc/sparc/clock.c 69 */ 70 #define CLOCK_NEWINT(statvar, statmin) ({ \ 71 u_long r, var = (statvar); \ 72 do { r = random() & (var - 1); } while (r == 0); \ 73 (statmin + r); \ 74 }) 75 76 /* 77 * Sun chose the year `68' as their base count, so that 78 * cl_year==0 means 1968. 79 */ 80 #define YEAR0 1968 81 82 /* 83 * interrupt level for clock 84 */ 85 #define CLOCK_LEVEL 5 86 87 #endif /* _MVME_CLOCKVAR_H */ 88