clock.c revision 1.2.4.5
1 1.2.4.5 nathanw /* $NetBSD: clock.c,v 1.2.4.5 2002/08/27 23:45:06 nathanw Exp $ */ 2 1.2.4.2 nathanw /* $OpenBSD: clock.c,v 1.3 1997/10/13 13:42:53 pefo Exp $ */ 3 1.2.4.2 nathanw 4 1.2.4.2 nathanw /* 5 1.2.4.2 nathanw * Copyright (C) 1995, 1996 Wolfgang Solfrank. 6 1.2.4.2 nathanw * Copyright (C) 1995, 1996 TooLs GmbH. 7 1.2.4.2 nathanw * All rights reserved. 8 1.2.4.2 nathanw * 9 1.2.4.2 nathanw * Redistribution and use in source and binary forms, with or without 10 1.2.4.2 nathanw * modification, are permitted provided that the following conditions 11 1.2.4.2 nathanw * are met: 12 1.2.4.2 nathanw * 1. Redistributions of source code must retain the above copyright 13 1.2.4.2 nathanw * notice, this list of conditions and the following disclaimer. 14 1.2.4.2 nathanw * 2. Redistributions in binary form must reproduce the above copyright 15 1.2.4.2 nathanw * notice, this list of conditions and the following disclaimer in the 16 1.2.4.2 nathanw * documentation and/or other materials provided with the distribution. 17 1.2.4.2 nathanw * 3. All advertising materials mentioning features or use of this software 18 1.2.4.2 nathanw * must display the following acknowledgement: 19 1.2.4.2 nathanw * This product includes software developed by TooLs GmbH. 20 1.2.4.2 nathanw * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 1.2.4.2 nathanw * derived from this software without specific prior written permission. 22 1.2.4.2 nathanw * 23 1.2.4.2 nathanw * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 1.2.4.2 nathanw * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 1.2.4.2 nathanw * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 1.2.4.2 nathanw * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 1.2.4.2 nathanw * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 1.2.4.2 nathanw * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 1.2.4.2 nathanw * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 1.2.4.2 nathanw * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 1.2.4.2 nathanw * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 1.2.4.2 nathanw * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 1.2.4.2 nathanw */ 34 1.2.4.2 nathanw 35 1.2.4.2 nathanw #include <sys/param.h> 36 1.2.4.2 nathanw #include <sys/kernel.h> 37 1.2.4.2 nathanw #include <sys/systm.h> 38 1.2.4.2 nathanw #include <sys/properties.h> 39 1.2.4.2 nathanw 40 1.2.4.2 nathanw #include <machine/dcr.h> 41 1.2.4.2 nathanw 42 1.2.4.2 nathanw #include <powerpc/spr.h> 43 1.2.4.2 nathanw 44 1.2.4.2 nathanw /* 45 1.2.4.2 nathanw * Initially we assume a processor with a bus frequency of 12.5 MHz. 46 1.2.4.2 nathanw */ 47 1.2.4.2 nathanw static u_long ticks_per_sec; 48 1.2.4.2 nathanw static u_long ns_per_tick; 49 1.2.4.2 nathanw static long ticks_per_intr; 50 1.2.4.2 nathanw static volatile u_long lasttb; 51 1.2.4.2 nathanw static u_long ticksmissed; 52 1.2.4.2 nathanw static volatile int tickspending; 53 1.2.4.2 nathanw 54 1.2.4.2 nathanw void decr_intr(struct clockframe *); /* called from trap_subr.S */ 55 1.2.4.2 nathanw void stat_intr(struct clockframe *); /* called from trap_subr.S */ 56 1.2.4.2 nathanw 57 1.2.4.2 nathanw #ifdef FAST_STAT_CLOCK 58 1.2.4.2 nathanw /* Stat clock runs at ~ 1.5KHz */ 59 1.2.4.2 nathanw #define PERIOD_POWER 17 60 1.2.4.2 nathanw #define TCR_PERIOD TCR_FP_2_17 61 1.2.4.2 nathanw #else 62 1.2.4.2 nathanw /* Stat clock runs at ~ 95Hz */ 63 1.2.4.2 nathanw #define PERIOD_POWER 21 64 1.2.4.2 nathanw #define TCR_PERIOD TCR_FP_2_21 65 1.2.4.3 nathanw #endif 66 1.2.4.2 nathanw 67 1.2.4.2 nathanw 68 1.2.4.2 nathanw void 69 1.2.4.2 nathanw stat_intr(struct clockframe *frame) 70 1.2.4.2 nathanw { 71 1.2.4.2 nathanw extern u_long intrcnt[]; 72 1.2.4.3 nathanw 73 1.2.4.2 nathanw mtspr(SPR_TSR, TSR_FIS); /* Clear TSR[FIS] */ 74 1.2.4.2 nathanw intrcnt[CNT_STATCLOCK]++; 75 1.2.4.2 nathanw statclock(frame); 76 1.2.4.2 nathanw } 77 1.2.4.2 nathanw 78 1.2.4.2 nathanw void 79 1.2.4.2 nathanw decr_intr(struct clockframe *frame) 80 1.2.4.2 nathanw { 81 1.2.4.2 nathanw int pri; 82 1.2.4.2 nathanw long tick, xticks; 83 1.2.4.2 nathanw int nticks; 84 1.2.4.2 nathanw extern u_long intrcnt[]; 85 1.2.4.2 nathanw /* 86 1.2.4.2 nathanw * Check whether we are initialized. 87 1.2.4.2 nathanw */ 88 1.2.4.2 nathanw if (!ticks_per_intr) 89 1.2.4.2 nathanw return; 90 1.2.4.2 nathanw 91 1.2.4.2 nathanw asm volatile("mftb %0":"=r"(tick):); 92 1.2.4.2 nathanw mtspr(SPR_TSR, TSR_PIS); /* Clear TSR[PIS] */ 93 1.2.4.2 nathanw /* 94 1.2.4.2 nathanw * lasttb is used during microtime. Set it to the virtual 95 1.2.4.2 nathanw * start of this tick interval. 96 1.2.4.2 nathanw */ 97 1.2.4.2 nathanw xticks = tick - lasttb; /* Number of TLB cycles since last exception */ 98 1.2.4.2 nathanw for (nticks = 0; xticks > ticks_per_intr; nticks++) 99 1.2.4.2 nathanw xticks -= ticks_per_intr; 100 1.2.4.2 nathanw lasttb = tick - xticks; 101 1.2.4.2 nathanw 102 1.2.4.2 nathanw intrcnt[CNT_CLOCK]++; 103 1.2.4.2 nathanw pri = splclock(); 104 1.2.4.2 nathanw if (pri & SPL_CLOCK) { 105 1.2.4.2 nathanw tickspending += nticks; 106 1.2.4.2 nathanw ticksmissed+= nticks; 107 1.2.4.2 nathanw } else { 108 1.2.4.2 nathanw nticks += tickspending; 109 1.2.4.2 nathanw tickspending = 0; 110 1.2.4.2 nathanw 111 1.2.4.2 nathanw /* 112 1.2.4.2 nathanw * Reenable interrupts 113 1.2.4.2 nathanw */ 114 1.2.4.2 nathanw asm volatile ("wrteei 1"); 115 1.2.4.2 nathanw 116 1.2.4.2 nathanw /* 117 1.2.4.2 nathanw * Do standard timer interrupt stuff. 118 1.2.4.2 nathanw * Do softclock stuff only on the last iteration. 119 1.2.4.2 nathanw */ 120 1.2.4.2 nathanw frame->pri = pri | SINT_CLOCK; 121 1.2.4.2 nathanw while (--nticks > 0) 122 1.2.4.2 nathanw hardclock(frame); 123 1.2.4.2 nathanw frame->pri = pri; 124 1.2.4.2 nathanw hardclock(frame); 125 1.2.4.2 nathanw } 126 1.2.4.2 nathanw splx(pri); 127 1.2.4.2 nathanw } 128 1.2.4.2 nathanw 129 1.2.4.2 nathanw void 130 1.2.4.2 nathanw cpu_initclocks(void) 131 1.2.4.2 nathanw { 132 1.2.4.4 nathanw 133 1.2.4.2 nathanw ticks_per_intr = ticks_per_sec / hz; 134 1.2.4.4 nathanw stathz = profhz = ticks_per_sec / (1 << PERIOD_POWER); 135 1.2.4.2 nathanw printf("Setting PIT to %ld/%d = %ld\n", ticks_per_sec, hz, ticks_per_intr); 136 1.2.4.2 nathanw asm volatile ("mftb %0" : "=r"(lasttb)); 137 1.2.4.2 nathanw mtspr(SPR_PIT, ticks_per_intr); 138 1.2.4.2 nathanw /* Enable PIT & FIT(2^17c = 0.655ms) interrupts and auto-reload */ 139 1.2.4.3 nathanw mtspr(SPR_TCR, TCR_PIE | TCR_ARE | TCR_FIE | TCR_PERIOD); 140 1.2.4.2 nathanw } 141 1.2.4.2 nathanw 142 1.2.4.2 nathanw void 143 1.2.4.2 nathanw calc_delayconst(void) 144 1.2.4.2 nathanw { 145 1.2.4.2 nathanw unsigned int processor_freq; 146 1.2.4.2 nathanw 147 1.2.4.3 nathanw if (board_info_get("processor-frequency", 148 1.2.4.2 nathanw &processor_freq, sizeof(processor_freq)) == -1) 149 1.2.4.2 nathanw panic("no processor-frequency"); 150 1.2.4.2 nathanw 151 1.2.4.2 nathanw ticks_per_sec = processor_freq; 152 1.2.4.2 nathanw ns_per_tick = 1000000000 / ticks_per_sec; 153 1.2.4.2 nathanw } 154 1.2.4.2 nathanw 155 1.2.4.2 nathanw /* 156 1.2.4.2 nathanw * Fill in *tvp with current time with microsecond resolution. 157 1.2.4.2 nathanw */ 158 1.2.4.2 nathanw void 159 1.2.4.2 nathanw microtime(struct timeval *tvp) 160 1.2.4.2 nathanw { 161 1.2.4.2 nathanw u_long tb; 162 1.2.4.2 nathanw u_long ticks; 163 1.2.4.2 nathanw int msr; 164 1.2.4.2 nathanw 165 1.2.4.2 nathanw asm volatile ("mfmsr %0; wrteei 0" : "=r"(msr) :); 166 1.2.4.2 nathanw asm ("mftb %0" : "=r"(tb)); 167 1.2.4.2 nathanw ticks = (tb - lasttb) * ns_per_tick; 168 1.2.4.2 nathanw *tvp = time; 169 1.2.4.2 nathanw asm volatile ("mtmsr %0" :: "r"(msr)); 170 1.2.4.2 nathanw ticks /= 1000; 171 1.2.4.2 nathanw tvp->tv_usec += ticks; 172 1.2.4.2 nathanw while (tvp->tv_usec >= 1000000) { 173 1.2.4.2 nathanw tvp->tv_usec -= 1000000; 174 1.2.4.2 nathanw tvp->tv_sec++; 175 1.2.4.2 nathanw } 176 1.2.4.2 nathanw } 177 1.2.4.2 nathanw 178 1.2.4.2 nathanw /* 179 1.2.4.2 nathanw * Wait for about n microseconds (at least!). 180 1.2.4.2 nathanw */ 181 1.2.4.2 nathanw void 182 1.2.4.2 nathanw delay(unsigned int n) 183 1.2.4.2 nathanw { 184 1.2.4.2 nathanw u_quad_t tb; 185 1.2.4.2 nathanw u_long tbh, tbl, scratch; 186 1.2.4.2 nathanw 187 1.2.4.2 nathanw tb = mftb(); 188 1.2.4.2 nathanw /* use 1000ULL to force 64 bit math to avoid 32 bit overflows */ 189 1.2.4.2 nathanw tb += (n * 1000ULL + ns_per_tick - 1) / ns_per_tick; 190 1.2.4.2 nathanw tbh = tb >> 32; 191 1.2.4.2 nathanw tbl = tb; 192 1.2.4.2 nathanw asm volatile ("1: mftbu %0; cmplw %0,%1; blt 1b; bgt 2f;" 193 1.2.4.2 nathanw "mftb %0; cmplw %0,%2; blt 1b; 2:" 194 1.2.4.2 nathanw : "=r"(scratch) : "r"(tbh), "r"(tbl)); 195 1.2.4.2 nathanw } 196 1.2.4.2 nathanw 197 1.2.4.2 nathanw /* 198 1.2.4.2 nathanw * Nothing to do. 199 1.2.4.2 nathanw */ 200 1.2.4.2 nathanw void 201 1.2.4.2 nathanw setstatclockrate(int arg) 202 1.2.4.2 nathanw { 203 1.2.4.2 nathanw 204 1.2.4.2 nathanw /* Do nothing */ 205 1.2.4.2 nathanw } 206
Indexes created Wed Oct 01 18:09:54 GMT 2025