- initial import

git-svn-id: http://moon:8086/svn/mips@1 a8ebac50-d88d-4704-bea3-6648445a41b3
2014-07-20 15:01:37 +00:00
commit 26291bca3d
1549 changed files with 3997969 additions and 0 deletions
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+/*
+ * bogomips.c -- Program to measure bogomips... this program will probably go
+ * totally wacky with cpufreq enabled.
+ *
+ * Copyright (C) 2005 Darrick Wong.
+ */
+#include <stdio.h>
+#include <time.h>
+
+/* this should be approx 2 Bo*oMips to start (note initial shift), and will
+ *    still work even if initially too large, it will just take slightly longer */
+unsigned long loops_per_jiffy = (1<<12);
+
+/* This is the number of bits of precision for the loops_per_jiffy.  Each
+ *    bit takes on average 1.5/HZ seconds.  This (like the original) is a little
+ *       better than 1% */
+#define LPS_PREC 8
+
+extern void delay(unsigned int loops);
+
+//plagiarized straight from the 2.4 sources.
+#ifdef NOMAIN
+int calibrate_delay(void)
+#else
+int main(void)
+#endif
+{
+        unsigned long ticks, loopbit;
+        int lps_precision = LPS_PREC;
+
+        loops_per_jiffy = (1<<12);
+
+        printf("Calibrating delay loop... ");
+        while (loops_per_jiffy <<= 1) {
+                /* wait for "start of" clock tick */
+                ticks = clock();
+                while (ticks == clock())
+                        /* nothing */;
+                /* Go .. */
+                ticks = clock();
+                delay(loops_per_jiffy);
+                ticks = clock() - ticks;
+                if (ticks)
+                        break;
+        }
+
+/* Do a binary approximation to get loops_per_jiffy set to equal one clock
+   (up to lps_precision bits) */
+
+       loops_per_jiffy >>= 1;
+        loopbit = loops_per_jiffy;
+        while ( lps_precision-- && (loopbit >>= 1) ) {
+                loops_per_jiffy |= loopbit;
+                ticks = clock();
+                while (ticks == clock());
+                ticks = clock();
+                delay(loops_per_jiffy);
+                if (clock() != ticks)   /* longer than 1 tick */
+                        loops_per_jiffy &= ~loopbit;
+        }
+
+
+/* Round the value and print it */
+        printf("%lu.%02lu BogoMIPS\n",
+                loops_per_jiffy/(500000/HZ),
+                (loops_per_jiffy/(5000/HZ)) % 100);
+
+
+		return loops_per_jiffy;
+}
+