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-rw-r--r--include/gapk/get_cycles.h138
1 files changed, 138 insertions, 0 deletions
diff --git a/include/gapk/get_cycles.h b/include/gapk/get_cycles.h
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+/*
+ * Copyright (c) 2005 Mellanox Technologies Ltd.,
+ * (c) 2005 Harald Welte <laforge@gnumonks.org>, All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * $Id$
+ */
+
+#ifndef GET_CLOCK_H
+#define GET_CLOCK_H
+
+#if 0
+
+#define _POSIX_C_SOURCE 199506L
+#include <unistd.h>
+#include <time.h>
+
+/* Ideally we would be using clock_getres() and clock_gettime().
+ * glibc manpage says CLOCK_PROCESS_CPUTIME_ID is only defined if it is
+ * actually present. however, on ppc64 it is defined but not implemented. */
+#ifdef CLOCK_PROCESS_CPUTIME_ID
+typedef long cycles_t;
+static inline cycles_t get_cycles()
+{
+ struct timespec ts;
+
+#if defined (__x86_64__) || defined(__i386__)
+ asm volatile ("cpuid"); /* flush pipeline */
+#endif
+ clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
+ return ts.tv_nsec;
+}
+#endif
+
+#endif
+
+#if defined (__x86_64__) || defined(__i386__)
+/* Note: only x86 CPUs which have rdtsc instruction are supported. */
+typedef unsigned long long cycles_t;
+static inline cycles_t get_cycles()
+{
+ unsigned low, high;
+ unsigned long long val;
+ asm volatile ("cpuid"); /* flush pipeline */
+ asm volatile ("rdtsc" : "=a" (low), "=d" (high));
+ val = high;
+ val = (val << 32) | low;
+ return val;
+}
+#elif defined(__PPC64__)
+/* Note: only PPC CPUs which have mftb instruction are supported. */
+typedef unsigned long long cycles_t;
+static inline cycles_t get_cycles()
+{
+ cycles_t ret;
+
+ asm volatile ("mftb %0" : "=r" (ret) : );
+ return ret;
+}
+#elif defined(__sparc__)
+/* Note: only sparc64 supports this register */
+typedef unsigned long long cycles_t;
+#define TICK_PRIV_BIT (1ULL << 63)
+static inline cycles_t get_cycles()
+{
+ cycles_t ret;
+
+#if defined(__sparcv9) || defined(__arch64__)
+ asm volatile ("rd %%tick, %0" : "=r" (ret));
+#else
+ asm volatile ("rd %%tick, %%g1\n\t"
+ "srlx %%g1, 32, %H0\n\t"
+ "srl %%g1, 0, %L0"
+ : "=r" (ret)
+ : /* no inputs */
+ : "g1");
+#endif
+ return ret & ~TICK_PRIV_BIT;
+}
+#elif defined(__PPC__)
+#define CPU_FTR_601 0x00000100
+typedef unsigned long cycles_t;
+static inline cycles_t get_cycles()
+{
+ cycles_t ret;
+
+ asm volatile (
+ "98: mftb %0\n"
+ "99:\n"
+ ".section __ftr_fixup,\"a\"\n"
+ " .long %1\n"
+ " .long 0\n"
+ " .long 98b\n"
+ " .long 99b\n"
+ ".previous"
+ : "=r" (ret) : "i" (CPU_FTR_601));
+ return ret;
+}
+#elif defined(__ia64__) || defined(__mips__) || \
+ defined(__s390__)
+/* Itanium2 and up has ar.itc (Itanium1 has errata) */
+/* PPC64 has mftb */
+#include <asm/timex.h>
+#else
+#warning get_cycles not implemented for this architecture: attempt asm/timex.h
+#include <asm/timex.h>
+#endif
+
+extern double get_cpu_mhz(void);
+
+#endif /* GET_CLOCK_H */