timing_test: Add vsyscall_time

1 files changed, 6 insertions, 0 deletions

diff --git a/timing_test.cc b/timing_test.cc
index b5ad60f..cf5e904 100644
--- a/timing_test.cc
+++ b/timing_test.cc
@@ -104,6 +104,12 @@ int main(int argc, char **argv)
 		unsigned int ecx = 0;
 	        for (size_t i = 0; i < loops; ++i)
 			asm volatile ("rdpmc" : "=a" (eax), "=d" (edx) : "c" (ecx));
+#ifdef __x86_64__
+	} else if (!strcmp(mode, "vsyscall_time")) {
+		auto vsyscall_time = (long (*)(long *))0xffffffffff600400;
+		for (size_t i = 0; i < loops; ++i)
+			vsyscall_time(nullptr);
+#endif
 	} else {
 		printf("Unknown mode %s\n", mode);
 		return 1;