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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-ia64/timex.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-ia64/timex.h')
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1 files changed, 40 insertions, 0 deletions
diff --git a/include/asm-ia64/timex.h b/include/asm-ia64/timex.h
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+++ b/include/asm-ia64/timex.h
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+#ifndef _ASM_IA64_TIMEX_H
+#define _ASM_IA64_TIMEX_H
+
+/*
+ * Copyright (C) 1998-2001, 2003 Hewlett-Packard Co
+ * David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+/*
+ * 2001/01/18 davidm Removed CLOCK_TICK_RATE. It makes no sense on IA-64.
+ * Also removed cacheflush_time as it's entirely unused.
+ */
+
+#include <asm/intrinsics.h>
+#include <asm/processor.h>
+
+typedef unsigned long cycles_t;
+
+/*
+ * For performance reasons, we don't want to define CLOCK_TICK_TRATE as
+ * local_cpu_data->itc_rate. Fortunately, we don't have to, either: according to George
+ * Anzinger, 1/CLOCK_TICK_RATE is taken as the resolution of the timer clock. The time
+ * calculation assumes that you will use enough of these so that your tick size <= 1/HZ.
+ * If the calculation shows that your CLOCK_TICK_RATE can not supply exactly 1/HZ ticks,
+ * the actual value is calculated and used to update the wall clock each jiffie. Setting
+ * the CLOCK_TICK_RATE to x*HZ insures that the calculation will find no errors. Hence we
+ * pick a multiple of HZ which gives us a (totally virtual) CLOCK_TICK_RATE of about
+ * 100MHz.
+ */
+#define CLOCK_TICK_RATE (HZ * 100000UL)
+
+static inline cycles_t
+get_cycles (void)
+{
+ cycles_t ret;
+
+ ret = ia64_getreg(_IA64_REG_AR_ITC);
+ return ret;
+}
+
+#endif /* _ASM_IA64_TIMEX_H */