1/* $NetBSD: clock.c,v 1.41 2011/02/08 20:20:07 rmind Exp $ */ 2 3/* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department and Ralph Campbell. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: Utah Hdr: clock.c 1.18 91/01/21 37 * 38 * @(#)clock.c 8.1 (Berkeley) 6/10/93 39 */ 40 41#include <sys/cdefs.h> 42__KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.41 2011/02/08 20:20:07 rmind Exp $"); 43 44#include <sys/param.h> 45#include <sys/kernel.h> 46#include <sys/systm.h> 47#include <sys/device.h> 48 49#include <machine/autoconf.h> 50#include <machine/cpuconf.h> 51#include <machine/cpu_counter.h> 52 53#include <alpha/alpha/clockvar.h> 54 55#define PCC_QUAL 1000 56 57void (*clock_init)(void *); 58void *clockdev; 59 60void 61clockattach(void (*fns)(void *), void *dev) 62{ 63 64 /* 65 * Just bookkeeping. 66 */ 67 if (clock_init != NULL) 68 panic("clockattach: multiple clocks"); 69 clock_init = fns; 70 clockdev = dev; 71} 72 73/* 74 * Start the real-time and statistics clocks. Leave stathz 0 since there 75 * are no other timers available. 76 */ 77void 78cpu_initclocks(void) 79{ 80 uint64_t pcc_freq; 81 82 if (clock_init == NULL) 83 panic("cpu_initclocks: no clock attached"); 84 85 /* 86 * Establish the clock interrupt; it's a special case. 87 * 88 * We establish the clock interrupt this late because if 89 * we do it at clock attach time, we may have never been at 90 * spl0() since taking over the system. Some versions of 91 * PALcode save a clock interrupt, which would get delivered 92 * when we spl0() in autoconf.c. If established the clock 93 * interrupt handler earlier, that interrupt would go to 94 * hardclock, which would then fall over because p->p_stats 95 * isn't set at that time. 96 */ 97 platform.clockintr = hardclock; 98 schedhz = 16; 99 100 /* 101 * Initialize PCC timecounter. 102 */ 103 pcc_freq = cpu_frequency(curcpu()); 104 cc_init(NULL, pcc_freq, "PCC", PCC_QUAL); 105 106 /* 107 * Get the clock started. 108 */ 109 (*clock_init)(clockdev); 110} 111 112/* 113 * We assume newhz is either stathz or profhz, and that neither will 114 * change after being set up above. Could recalculate intervals here 115 * but that would be a drag. 116 */ 117void 118setstatclockrate(int newhz) 119{ 120 121 /* nothing we can do */ 122} 123