forked from AbleOS/ableos
78 lines
1.4 KiB
C
78 lines
1.4 KiB
C
// Utterly stolen from stack overflow
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/*
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* Standalone BogoMips program
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*
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* Based on code Linux kernel code in init/main.c and
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* include/linux/delay.h
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*
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* For more information on interpreting the results, see the BogoMIPS
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* Mini-HOWTO document.
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*
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* version: 1.3
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* author: Jeff Tranter (Jeff_Tranter@Mitel.COM)
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*/
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#include <stdio.h>
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#include <time.h>
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#ifdef CLASSIC_BOGOMIPS
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/* the original code from the Linux kernel */
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static __inline__ void delay(int loops)
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{
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__asm__(".align 2,0x90\n1:\tdecl %0\n\tjns 1b": :"a" (loops):"ax");
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}
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#endif
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#ifdef QNX_BOGOMIPS
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/* version for QNX C compiler */
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void delay(int loops);
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#pragma aux delay = \
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"l1:" \
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"dec eax" \
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"jns l1" \
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parm nomemory [eax] modify exact nomemory [eax];
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#endif
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#ifdef PORTABLE_BOGOMIPS
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/* portable version */
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static void delay(int loops)
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{
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long i;
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for (i = loops; i >= 0 ; i--)
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;
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}
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#endif
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int
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main(void)
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{
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unsigned long loops_per_sec = 1;
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unsigned long ticks;
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printf("Calibrating delay loop.. ");
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fflush(stdout);
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while ((loops_per_sec <<= 1)) {
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ticks = clock();
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delay(loops_per_sec);
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ticks = clock() - ticks;
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if (ticks >= CLOCKS_PER_SEC) {
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loops_per_sec = (loops_per_sec / ticks) * CLOCKS_PER_SEC;
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printf("ok - %lu.%02lu BogoMips\n",
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loops_per_sec/500000,
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(loops_per_sec/5000) % 100
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);
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return 0;
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}
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}
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printf("failed\n");
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return -1;
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}
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