1 /* $OpenBSD: clock.c,v 1.12 2002/02/01 19:03:18 mickey Exp $ */ 2 3 /* 4 * Copyright (c) 1998,1999 Michael Shalayeff 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Michael Shalayeff. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF MIND, 27 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/time.h> 37 38 #include <dev/clock_subr.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 #if defined(DDB) 49 #include <uvm/uvm_extern.h> 50 #include <machine/db_machdep.h> 51 #include <ddb/db_sym.h> 52 #include <ddb/db_extern.h> 53 #endif 54 55 struct timeval time; 56 57 void startrtclock __P((void)); 58 59 void 60 cpu_initclocks() 61 { 62 extern u_int cpu_hzticks; 63 u_int time_inval; 64 65 /* Start the interval timer. */ 66 mfctl(CR_ITMR, time_inval); 67 mtctl(time_inval + cpu_hzticks, CR_ITMR); 68 } 69 70 int 71 clock_intr (v) 72 void *v; 73 { 74 struct trapframe *frame = v; 75 76 /* printf ("clock int 0x%x @ 0x%x for %p\n", t, 77 frame->tf_iioq_head, curproc); */ 78 79 cpu_initclocks(); 80 hardclock(frame); 81 82 #if 0 83 ddb_regs = *frame; 84 db_show_regs(NULL, 0, 0, NULL); 85 #endif 86 87 /* printf ("clock out 0x%x\n", t); */ 88 89 return 1; 90 } 91 92 93 /* 94 * initialize the system time from the time of day clock 95 */ 96 void 97 inittodr(t) 98 time_t t; 99 { 100 struct pdc_tod tod PDC_ALIGNMENT; 101 int tbad = 0; 102 103 if (t < 5*SECYR) { 104 printf ("WARNING: preposterous time in file system"); 105 t = 6*SECYR + 186*SECDAY + SECDAY/2; 106 tbad = 1; 107 } 108 109 pdc_call((iodcio_t)PAGE0->mem_pdc, 1, PDC_TOD, PDC_TOD_READ, 110 &tod, 0, 0, 0, 0, 0); 111 112 time.tv_sec = tod.sec; 113 time.tv_usec = tod.usec; 114 115 if (!tbad) { 116 u_long dt; 117 118 dt = (time.tv_sec < t)? t - time.tv_sec : time.tv_sec - t; 119 120 if (dt < 2 * SECDAY) 121 return; 122 printf("WARNING: clock %s %ld days", 123 time.tv_sec < t? "lost" : "gained", dt / SECDAY); 124 } 125 126 printf (" -- CHECK AND RESET THE DATE!\n"); 127 } 128 129 /* 130 * reset the time of day clock to the value in time 131 */ 132 void 133 resettodr() 134 { 135 struct pdc_tod tod PDC_ALIGNMENT; 136 137 tod.sec = time.tv_sec; 138 tod.usec = time.tv_usec; 139 140 pdc_call((iodcio_t)PAGE0->mem_pdc, 1, PDC_TOD, PDC_TOD_WRITE, &tod); 141 } 142 143 void 144 setstatclockrate(newhz) 145 int newhz; 146 { 147 /* nothing we can do */ 148 } 149 150