1 files changed, 52 insertions, 0 deletions

diff --git a/include/asm-i386/timex.h b/include/asm-i386/timex.h
new file mode 100644
index 000000000000..b41e484c3445
--- /dev/null
+++ b/include/asm-i386/timex.h
@@ -0,0 +1,52 @@
+/*
+ * linux/include/asm-i386/timex.h
+ *
+ * i386 architecture timex specifications
+ */
+#ifndef _ASMi386_TIMEX_H
+#define _ASMi386_TIMEX_H
+
+#include <linux/config.h>
+#include <asm/processor.h>
+
+#ifdef CONFIG_X86_ELAN
+#  define CLOCK_TICK_RATE 1189200 /* AMD Elan has different frequency! */
+#else
+#  define CLOCK_TICK_RATE 1193182 /* Underlying HZ */
+#endif
+
+
+/*
+ * Standard way to access the cycle counter on i586+ CPUs.
+ * Currently only used on SMP.
+ *
+ * If you really have a SMP machine with i486 chips or older,
+ * compile for that, and this will just always return zero.
+ * That's ok, it just means that the nicer scheduling heuristics
+ * won't work for you.
+ *
+ * We only use the low 32 bits, and we'd simply better make sure
+ * that we reschedule before that wraps. Scheduling at least every
+ * four billion cycles just basically sounds like a good idea,
+ * regardless of how fast the machine is. 
+ */
+typedef unsigned long long cycles_t;
+
+static inline cycles_t get_cycles (void)
+{
+        unsigned long long ret=0;
+
+#ifndef CONFIG_X86_TSC
+        if (!cpu_has_tsc)
+                return 0;
+#endif
+
+#if defined(CONFIG_X86_GENERIC) || defined(CONFIG_X86_TSC)
+        rdtscll(ret);
+#endif
+        return ret;
+}
+
+extern unsigned long cpu_khz;
+
+#endif