x86-64: Move vread_tsc and vread_hpet into the vDSO

The vsyscall page now consists entirely of trap instructions.

Cc: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/637648f303f2ef93af93bae25186e9a1bea093f5.1310639973.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/x86/include/asm/clocksource.h b/arch/x86/include/asm/clocksource.h
index a5df33f614c9..3882c65dc19b 100644
--- a/arch/x86/include/asm/clocksource.h
+++ b/arch/x86/include/asm/clocksource.h
@@ -7,8 +7,12 @@
 
 #define __ARCH_HAS_CLOCKSOURCE_DATA
 
+#define VCLOCK_NONE 0  /* No vDSO clock available.      */
+#define VCLOCK_TSC  1  /* vDSO should use vread_tsc.    */
+#define VCLOCK_HPET 2  /* vDSO should use vread_hpet.   */
+
 struct arch_clocksource_data {
-        cycle_t (*vread)(void);
+        int vclock_mode;
 };
 
 #endif /* CONFIG_X86_64 */