1 /* $NetBSD: clockvar.h,v 1.9 2009/05/12 14:38:26 cegger 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _MVME_CLOCKVAR_H 33 #define _MVME_CLOCKVAR_H 34 35 #include <dev/clock_subr.h> 36 37 /* 38 * Definitions exported to ASIC-specific clock attachment. 39 */ 40 41 extern struct evcnt clock_profcnt; 42 extern struct evcnt clock_statcnt; 43 44 extern int clock_statvar; 45 extern int clock_statmin; 46 47 struct clock_attach_args { 48 void (*ca_initfunc)(void *, int, int); 49 void *ca_arg; 50 }; 51 52 void clock_config(device_t, struct clock_attach_args *, 53 struct evcnt *); 54 55 /* 56 * Macro to compute a new randomized interval. The intervals are 57 * uniformly distributed on [statint - statvar / 2, statint + statvar / 2], 58 * and therefore have mean statint, giving a stathz frequency clock. 59 * 60 * This is gratuitously stolen from sparc/sparc/clock.c 61 */ 62 #define CLOCK_NEWINT(statvar, statmin) ({ \ 63 u_long r, var = (statvar); \ 64 do { r = random() & (var - 1); } while (r == 0); \ 65 (statmin + r); \ 66 }) 67 68 /* 69 * Sun chose the year `68' as their base count, so that 70 * cl_year==0 means 1968. 71 */ 72 #define YEAR0 1968 73 74 /* 75 * interrupt level for clock 76 */ 77 #define CLOCK_LEVEL 5 78 79 #endif /* _MVME_CLOCKVAR_H */ 80