1*7cf29912Scegger /* $NetBSD: clockvar.h,v 1.9 2009/05/12 14:38:26 cegger Exp $ */ 28c75e475Sscw 38c75e475Sscw /*- 48c75e475Sscw * Copyright (c) 1996, 2002 The NetBSD Foundation, Inc. 58c75e475Sscw * All rights reserved. 68c75e475Sscw * 78c75e475Sscw * This code is derived from software contributed to The NetBSD Foundation 88c75e475Sscw * by Jason R. Thorpe. 98c75e475Sscw * 108c75e475Sscw * Redistribution and use in source and binary forms, with or without 118c75e475Sscw * modification, are permitted provided that the following conditions 128c75e475Sscw * are met: 138c75e475Sscw * 1. Redistributions of source code must retain the above copyright 148c75e475Sscw * notice, this list of conditions and the following disclaimer. 158c75e475Sscw * 2. Redistributions in binary form must reproduce the above copyright 168c75e475Sscw * notice, this list of conditions and the following disclaimer in the 178c75e475Sscw * documentation and/or other materials provided with the distribution. 188c75e475Sscw * 198c75e475Sscw * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 208c75e475Sscw * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 218c75e475Sscw * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 228c75e475Sscw * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 238c75e475Sscw * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 248c75e475Sscw * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 258c75e475Sscw * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 268c75e475Sscw * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 278c75e475Sscw * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 288c75e475Sscw * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 298c75e475Sscw * POSSIBILITY OF SUCH DAMAGE. 308c75e475Sscw */ 318c75e475Sscw 328c75e475Sscw #ifndef _MVME_CLOCKVAR_H 338c75e475Sscw #define _MVME_CLOCKVAR_H 348c75e475Sscw 358c75e475Sscw #include <dev/clock_subr.h> 368c75e475Sscw 378c75e475Sscw /* 38db579612Swiz * Definitions exported to ASIC-specific clock attachment. 398c75e475Sscw */ 408c75e475Sscw 418c75e475Sscw extern struct evcnt clock_profcnt; 428c75e475Sscw extern struct evcnt clock_statcnt; 438c75e475Sscw 448c75e475Sscw extern int clock_statvar; 458c75e475Sscw extern int clock_statmin; 468c75e475Sscw 478c75e475Sscw struct clock_attach_args { 4818db93c7Sperry void (*ca_initfunc)(void *, int, int); 498c75e475Sscw void *ca_arg; 508c75e475Sscw }; 518c75e475Sscw 52*7cf29912Scegger void clock_config(device_t, struct clock_attach_args *, 5318db93c7Sperry struct evcnt *); 548c75e475Sscw 558c75e475Sscw /* 568c75e475Sscw * Macro to compute a new randomized interval. The intervals are 578c75e475Sscw * uniformly distributed on [statint - statvar / 2, statint + statvar / 2], 588c75e475Sscw * and therefore have mean statint, giving a stathz frequency clock. 598c75e475Sscw * 608c75e475Sscw * This is gratuitously stolen from sparc/sparc/clock.c 618c75e475Sscw */ 628c75e475Sscw #define CLOCK_NEWINT(statvar, statmin) ({ \ 638c75e475Sscw u_long r, var = (statvar); \ 648c75e475Sscw do { r = random() & (var - 1); } while (r == 0); \ 658c75e475Sscw (statmin + r); \ 668c75e475Sscw }) 678c75e475Sscw 688c75e475Sscw /* 698c75e475Sscw * Sun chose the year `68' as their base count, so that 708c75e475Sscw * cl_year==0 means 1968. 718c75e475Sscw */ 728c75e475Sscw #define YEAR0 1968 738c75e475Sscw 748c75e475Sscw /* 758c75e475Sscw * interrupt level for clock 768c75e475Sscw */ 778c75e475Sscw #define CLOCK_LEVEL 5 788c75e475Sscw 798c75e475Sscw #endif /* _MVME_CLOCKVAR_H */ 80