Add support for ppc hw tb clock, remove kernelcompat.h

[ust.git] / include / ust / clock.h

diff --git a/include/ust/clock.h b/include/ust/clock.h
new file mode 100644 (file)
index 0000000..d4b6a9d
--- /dev/null
+++ b/include/ust/clock.h
@@ -0,0 +1,115 @@
+/* Copyright (C) 2010  Pierre-Marc Fournier
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#ifndef UST_CLOCK_H
+#define UST_CLOCK_H
+
+#include <sys/time.h>
+#include <ust/kcompat/kcompat.h>
+
+/* TRACE CLOCK */
+
+/* There are two types of clocks that can be used.
+   - TSC based clock
+   - gettimeofday() clock
+
+   Microbenchmarks on Linux 2.6.30 on Core2 Duo 3GHz (functions are inlined):
+     Calls (100000000) to tsc(): 4004035641 cycles or 40 cycles/call
+     Calls (100000000) to gettimeofday(): 9723158352 cycles or 97 cycles/call
+
+   For merging traces with the kernel, a time source compatible with that of
+   the kernel is necessary.
+
+*/
+
+#define TRACE_CLOCK_GENERIC
+#ifdef TRACE_CLOCK_GENERIC
+
+static __inline__ u64 trace_clock_read64(void)
+{
+       struct timeval tv;
+       u64 retval;
+
+       gettimeofday(&tv, NULL);
+       retval = tv.tv_sec;
+       retval *= 1000000;
+       retval += tv.tv_usec;
+
+       return retval;
+}
+
+#else
+
+#if __i386 || __x86_64
+
+/* WARNING: Make sure to set frequency and scaling functions that will not
+ * result in lttv timestamps (sec.nsec) with seconds greater than 2**32-1.
+ */
+static __inline__ u64 trace_clock_read64(void)
+{
+       uint32_t low;
+       uint32_t high;
+       uint64_t retval;
+       __asm__ volatile ("rdtsc\n" : "=a" (low), "=d" (high));
+
+       retval = high;
+       retval <<= 32;
+       return retval | low;
+}
+
+#endif /* __i386 || __x86_64 */
+
+#ifdef __PPC__
+
+static __inline__ u64 trace_clock_read64(void)
+{
+       unsigned long tb_l;
+       unsigned long tb_h;
+       unsigned long tb_h2;
+       u64 tb;
+
+       __asm__ (
+               "1:\n\t"
+               "mftbu %[rhigh]\n\t"
+               "mftb %[rlow]\n\t"
+               "mftbu %[rhigh2]\n\t"
+               "cmpw %[rhigh],%[rhigh2]\n\t"
+               "bne 1b\n\t"
+       : [rhigh] "=r" (tb_h), [rhigh2] "=r" (tb_h2), [rlow] "=r" (tb_l));
+       
+       tb = tb_h;
+       tb <<= 32;
+       tb |= tb_l;
+
+       return tb;
+}
+
+#endif /* __PPC__ */
+
+#endif /* ! UST_TRACE_CLOCK_GENERIC */
+
+static __inline__ u64 trace_clock_frequency(void)
+{
+       return 1000000LL;
+}
+
+static __inline__ u32 trace_clock_freq_scale(void)
+{
+       return 1;
+}
+
+#endif /* UST_CLOCK_H */