1 /* $NetBSD: clock.c,v 1.1 2014/02/24 07:23:42 skrll Exp $ */ 2 3 /* $OpenBSD: clock.c,v 1.10 2001/08/31 03:13:42 mickey Exp $ */ 4 5 /* 6 * Copyright (c) 1998-2003 Michael Shalayeff 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.1 2014/02/24 07:23:42 skrll Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/time.h> 38 #include <sys/timetc.h> 39 40 #include <machine/pdc.h> 41 #include <machine/iomod.h> 42 #include <machine/psl.h> 43 #include <machine/intr.h> 44 #include <machine/reg.h> 45 #include <machine/cpufunc.h> 46 #include <machine/autoconf.h> 47 48 #include <hppa/hppa/machdep.h> 49 50 #if defined(DDB) 51 #include <machine/db_machdep.h> 52 #include <ddb/db_sym.h> 53 #include <ddb/db_extern.h> 54 #endif 55 56 static unsigned get_itimer_count(struct timecounter *); 57 58 void 59 cpu_initclocks(void) 60 { 61 static struct timecounter tc = { 62 .tc_get_timecount = get_itimer_count, 63 .tc_name = "itimer", 64 .tc_counter_mask = ~0, 65 .tc_quality = 100, 66 }; 67 68 extern u_int cpu_hzticks; 69 u_int time_inval; 70 71 tc.tc_frequency = cpu_hzticks * hz; 72 73 /* Start the interval timer. */ 74 mfctl(CR_ITMR, time_inval); 75 mtctl(time_inval + cpu_hzticks, CR_ITMR); 76 77 tc_init(&tc); 78 } 79 80 unsigned 81 get_itimer_count(struct timecounter *tc) 82 { 83 uint32_t val; 84 85 mfctl(CR_ITMR, val); 86 87 return val; 88 } 89 90 int 91 clock_intr(void *v) 92 { 93 struct clockframe *frame = v; 94 extern u_int cpu_hzticks; 95 u_int time_inval; 96 97 /* Restart the interval timer. */ 98 mfctl(CR_ITMR, time_inval); 99 mtctl(time_inval + cpu_hzticks, CR_ITMR); 100 101 /* printf ("clock int 0x%x @ 0x%x for %p\n", t, 102 CLKF_PC(frame), curproc); */ 103 104 if (!cold) 105 hardclock(frame); 106 107 #if 0 108 ddb_regs = *frame; 109 db_show_regs(NULL, 0, 0, NULL); 110 #endif 111 112 /* printf ("clock out 0x%x\n", t); */ 113 114 return 1; 115 } 116 117 void 118 setstatclockrate(int newhz) 119 { 120 /* nothing we can do */ 121 } 122 123