patch-2.2.0-pre2 linux/include/asm-alpha/timex.h

• Lines: 24
• Date: Tue Dec 29 13:56:15 1998
• Orig file: v2.2.0-pre1/linux/include/asm-alpha/timex.h
• Orig date: Fri May 8 23:14:54 1998

diff -u --recursive --new-file v2.2.0-pre1/linux/include/asm-alpha/timex.h linux/include/asm-alpha/timex.h
@@ -8,4 +8,23 @@
 
 #define CLOCK_TICK_RATE	1193180 /* Underlying HZ */
 
+/*
+ * Standard way to access the cycle counter.
+ * Currently only used on SMP for scheduling.
+ *
+ * Only the low 32 bits are available as a continuously counting entity. 
+ * But this only means we'll force a reschedule every 8 seconds or so,
+ * which isn't an evil thing.
+ */
+
+typedef unsigned int cycles_t;
+extern cycles_t cacheflush_time;
+
+static inline cycles_t get_cycles (void)
+{
+	cycles_t ret;
+	__asm__ __volatile__ ("rpcc %0" : "=r"(ret));
+	return ret;
+}
+
 #endif