1 /* $NetBSD: clockvar.h,v 1.1 2024/01/02 07:41:00 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 2002, 2023 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 _VIRT68K_CLOCKVAR_H_ 33 #define _VIRT68K_CLOCKVAR_H_ 34 35 #include <sys/evcnt.h> 36 #include <dev/clock_subr.h> 37 38 extern int clock_statvar; 39 extern int clock_statmin; 40 struct clockframe; 41 42 #define CLOCK_NONE -1 43 #define CLOCK_HARDCLOCK 0 44 #define CLOCK_STATCLOCK 1 45 #define NCLOCKS 2 46 47 struct clock_attach_args { 48 void (*ca_initfunc)(void *, unsigned int, 49 struct evcnt *ev, 50 void (*func)(struct clockframe *)); 51 void *ca_arg; 52 struct evcnt *ca_parent_evcnt; 53 int ca_which; 54 }; 55 56 const char *clock_name(int); 57 void clock_attach(device_t, struct clock_attach_args *, 58 void (*)(device_t, unsigned int)); 59 60 extern void *clock_devices[NCLOCKS]; 61 62 /* 63 * Macro to compute a new randomized interval. The intervals are 64 * uniformly distributed on [statint - statvar / 2, statint + statvar / 2], 65 * and therefore have mean statint, giving a stathz frequency clock. 66 * 67 * This is gratuitously stolen from sparc/sparc/clock.c 68 */ 69 #define CLOCK_NEWINT(statvar, statmin) ({ \ 70 u_long r, var = (statvar); \ 71 do { r = random() & (var - 1); } while (r == 0); \ 72 (statmin + r); \ 73 }) 74 75 /* 76 * Sun chose the year `68' as their base count, so that 77 * cl_year==0 means 1968. 78 */ 79 #define YEAR0 1968 80 81 #endif /* _VIRT68K_CLOCKVAR_H_ */ 82