1 /* $NetBSD: timer.c,v 1.3 2005/01/22 07:35:33 tsutsui Exp $ */ 2 /* NetBSD: clock.c,v 1.31 2001/05/27 13:53:24 sommerfeld Exp */ 3 4 /* 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 * Copyright (c) 1988 University of Utah. 42 * 43 * This code is derived from software contributed to Berkeley by 44 * the Systems Programming Group of the University of Utah Computer 45 * Science Department and Ralph Campbell. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. All advertising materials mentioning features or use of this software 56 * must display the following acknowledgement: 57 * This product includes software developed by the University of 58 * California, Berkeley and its contributors. 59 * 4. Neither the name of the University nor the names of its contributors 60 * may be used to endorse or promote products derived from this software 61 * without specific prior written permission. 62 * 63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 73 * SUCH DAMAGE. 74 * 75 * from: Utah Hdr: clock.c 1.18 91/01/21 76 * 77 * @(#)clock.c 8.1 (Berkeley) 6/10/93 78 */ 79 80 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 81 82 __KERNEL_RCSID(0, "$NetBSD: timer.c,v 1.3 2005/01/22 07:35:33 tsutsui Exp $"); 83 84 #include <sys/param.h> 85 #include <sys/kernel.h> 86 #include <sys/systm.h> 87 88 #include <arc/arc/timervar.h> 89 90 struct device *timerdev; 91 const struct timerfns *timerfns; 92 int timerinitted; 93 94 void 95 timerattach(struct device *dev, const struct timerfns *fns) 96 { 97 98 /* 99 * Just bookkeeping. 100 */ 101 102 if (timerfns != NULL) 103 panic("timerattach: multiple timers"); 104 timerdev = dev; 105 timerfns = fns; 106 } 107 108 /* 109 * Machine-dependent clock routines. 110 */ 111 112 /* 113 * Start the real-time and statistics clocks. Leave stathz 0 since there 114 * are no other timers available. 115 */ 116 void 117 cpu_initclocks(void) 118 { 119 if (timerfns == NULL) 120 panic("cpu_initclocks: no timer attached"); 121 122 tick = 1000000 / hz; /* number of microseconds between interrupts */ 123 tickfix = 1000000 - (hz * tick); 124 if (tickfix) { 125 int ftp; 126 127 ftp = min(ffs(tickfix), ffs(hz)); 128 tickfix >>= (ftp - 1); 129 tickfixinterval = hz >> (ftp - 1); 130 } 131 132 /* 133 * Get the clock started. 134 */ 135 (*timerfns->tf_init)(timerdev); 136 } 137 138 /* 139 * We assume newhz is either stathz or profhz, and that neither will 140 * change after being set up above. Could recalculate intervals here 141 * but that would be a drag. 142 */ 143 void 144 setstatclockrate(int newhz) 145 { 146 147 /* nothing we can do */ 148 } 149 150 /* 151 * Wait "n" microseconds. 152 * XXX Should be calibrated with the cycle counter. 153 */ 154 void 155 delay(int n) 156 { 157 158 DELAY(n); 159 } 160