1 /* $NetBSD: clock.c,v 1.17 2006/09/09 03:14:18 tsutsui 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. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)clock.c 8.1 (Berkeley) 6/11/93 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.17 2006/09/09 03:14:18 tsutsui Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/systm.h> 49 #include <sys/device.h> 50 51 #include <news68k/news68k/clockvar.h> 52 53 #include <machine/cpu.h> 54 55 static void (*cpu_initclocks_hook)(int, int); 56 57 void 58 timer_config(void (*initfunc)(int, int)) 59 { 60 61 if (cpu_initclocks_hook) 62 panic("clock_config: too many timers configured"); 63 64 cpu_initclocks_hook = initfunc; 65 } 66 67 /* 68 * Set up the real-time and statistics clocks. Leave stathz 0 only 69 * if no alternative timer is available. 70 * 71 * The frequencies of these clocks must be an even number of microseconds. 72 */ 73 void 74 cpu_initclocks(void) 75 { 76 77 if (cpu_initclocks_hook == NULL) 78 panic("no timer device configured"); 79 80 if (1000000 % hz) { 81 printf("cannot get %d Hz clock; using 100 Hz\n", hz); 82 hz = 100; 83 tick = 1000000 / hz; 84 } 85 86 /* Call the machine-specific initclocks hook. */ 87 88 (*cpu_initclocks_hook)(0, 0); 89 } 90 91 /* 92 * This does not need to do anything, as we have only one timer and 93 * profhz == stathz == hz. 94 */ 95 void 96 setstatclockrate(int newhz) 97 { 98 99 /* nothing to do */ 100 } 101