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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-ppc/timex.h
Linux-2.6.12-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-ppc/timex.h')
-rw-r--r--include/asm-ppc/timex.h40
1 files changed, 40 insertions, 0 deletions
diff --git a/include/asm-ppc/timex.h b/include/asm-ppc/timex.h
new file mode 100644
index 00000000000..cffc8712077
--- /dev/null
+++ b/include/asm-ppc/timex.h
@@ -0,0 +1,40 @@
+/*
+ * include/asm-ppc/timex.h
+ *
+ * ppc architecture timex specifications
+ */
+#ifdef __KERNEL__
+#ifndef _ASMppc_TIMEX_H
+#define _ASMppc_TIMEX_H
+
+#include <linux/config.h>
+#include <asm/cputable.h>
+
+#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
+
+typedef unsigned long cycles_t;
+
+/*
+ * For the "cycle" counter we use the timebase lower half.
+ * Currently only used on SMP.
+ */
+
+static inline cycles_t get_cycles(void)
+{
+ cycles_t ret = 0;
+
+ __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;
+}
+
+#endif
+#endif /* __KERNEL__ */