jens
191af92d47
Committed on the Free edition of March Hare Software CVSNT Server. Upgrade to CVS Suite for more features and support: http://march-hare.com/cvsnt/ git-svn-id: http://moon:8086/svn/vhdl/trunk@790 cc03376c-175c-47c8-b038-4cd826a8556b
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/*
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* bogomips.c -- Program to measure bogomips... this program will probably go
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* totally wacky with cpufreq enabled.
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*
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* Copyright (C) 2005 Darrick Wong.
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*/
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#include <stdio.h>
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#include <time.h>
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/* this should be approx 2 Bo*oMips to start (note initial shift), and will
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* still work even if initially too large, it will just take slightly longer */
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unsigned long loops_per_jiffy = (1<<12);
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/* This is the number of bits of precision for the loops_per_jiffy. Each
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* bit takes on average 1.5/HZ seconds. This (like the original) is a little
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* better than 1% */
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#define LPS_PREC 8
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extern void delay(unsigned int loops);
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//plagiarized straight from the 2.4 sources.
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#ifdef NOMAIN
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int calibrate_delay(void)
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#else
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int main(void)
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#endif
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{
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unsigned long ticks, loopbit;
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int lps_precision = LPS_PREC;
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loops_per_jiffy = (1<<12);
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printf("Calibrating delay loop... ");
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while (loops_per_jiffy <<= 1) {
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/* wait for "start of" clock tick */
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ticks = clock();
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while (ticks == clock())
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/* nothing */;
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/* Go .. */
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ticks = clock();
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delay(loops_per_jiffy);
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ticks = clock() - ticks;
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if (ticks)
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break;
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}
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/* Do a binary approximation to get loops_per_jiffy set to equal one clock
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(up to lps_precision bits) */
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loops_per_jiffy >>= 1;
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loopbit = loops_per_jiffy;
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while ( lps_precision-- && (loopbit >>= 1) ) {
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loops_per_jiffy |= loopbit;
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ticks = clock();
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while (ticks == clock());
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ticks = clock();
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delay(loops_per_jiffy);
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if (clock() != ticks) /* longer than 1 tick */
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loops_per_jiffy &= ~loopbit;
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}
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/* Round the value and print it */
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printf("%lu.%02lu BogoMIPS\n",
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loops_per_jiffy/(500000/HZ),
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(loops_per_jiffy/(5000/HZ)) % 100);
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return loops_per_jiffy;
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}
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