diff mbox

Added x86/tsc_adjust.c to test the ia32_tsc_adjust funtionality.

Message ID 1353553860.6881.0.camel@WillAuldHomeLinux (mailing list archive)
State New, archived
Headers show

Commit Message

Will Auld Nov. 22, 2012, 3:11 a.m. UTC 
Signed-off-by: Will Auld <will.auld@intel.com>
---
 config-x86-common.mak |  5 ++++-
 x86/tsc_adjust.c      | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 x86/tsc_adjust.c
diff mbox

Patch

diff --git a/config-x86-common.mak b/config-x86-common.mak
index c76cd11..47a9056 100644
--- a/config-x86-common.mak
+++ b/config-x86-common.mak
@@ -34,7 +34,8 @@  tests-common = $(TEST_DIR)/vmexit.flat $(TEST_DIR)/tsc.flat \
                $(TEST_DIR)/realmode.flat $(TEST_DIR)/msr.flat \
                $(TEST_DIR)/hypercall.flat $(TEST_DIR)/sieve.flat \
                $(TEST_DIR)/kvmclock_test.flat  $(TEST_DIR)/eventinj.flat \
-               $(TEST_DIR)/s3.flat $(TEST_DIR)/pmu.flat $(TEST_DIR)/asyncpf.flat
+               $(TEST_DIR)/s3.flat $(TEST_DIR)/pmu.flat \
+	       $(TEST_DIR)/tsc_adjust.flat $(TEST_DIR)/asyncpf.flat
 
 ifdef API
 tests-common += api/api-sample
@@ -64,6 +65,8 @@  $(TEST_DIR)/port80.elf: $(cstart.o) $(TEST_DIR)/port80.o
 
 $(TEST_DIR)/tsc.elf: $(cstart.o) $(TEST_DIR)/tsc.o
 
+$(TEST_DIR)/tsc_adjust.elf: $(cstart.o) $(TEST_DIR)/tsc_adjust.o
+
 $(TEST_DIR)/apic.elf: $(cstart.o) $(TEST_DIR)/apic.o
 
 $(TEST_DIR)/realmode.elf: $(TEST_DIR)/realmode.o
diff --git a/x86/tsc_adjust.c b/x86/tsc_adjust.c
new file mode 100644
index 0000000..bcb8982
--- /dev/null
+++ b/x86/tsc_adjust.c
@@ -0,0 +1,43 @@ 
+#include "libcflat.h"
+#include "processor.h"
+
+#define IA32_TSC_ADJUST 0x3b
+
+int main()
+{
+	u64 t1, t2, t3, t4, t5;
+	u64 lat;
+
+	t3 = 0x0;
+
+	t1 = rdtsc();
+	wrmsr(IA32_TSC_ADJUST, t3);
+	t2 = rdtsc();
+	lat = t2 - t1;
+	printf("rdtsc/wrmsr/rdtsc latency %lld\n", lat);
+	printf("Initial rdtsc: %lld\n", t2);
+
+	t1 = rdmsr(IA32_TSC_ADJUST);
+	printf("Initial rdmsr IA32_TSC_ADJUST: %lld\n", t1);
+	
+	t5 = 100000000000ull;
+	wrtsc(t5);
+	t1 = rdmsr(IA32_TSC_ADJUST);
+	printf("wrtsc %lld, rdmsr IA32_TSC_ADJUST: %lld\n", t5, t1);
+
+	wrmsr(IA32_TSC_ADJUST, t3);
+	t2 = rdtsc();
+	t1 = rdmsr(IA32_TSC_ADJUST);
+	printf( "wrmsr IA32_TSC_ADJUST %lld, rdmsr IA32_TSC_ADJUST: %lld, rdtsc: %lld\n", t3, t1, t2);
+	
+	t3 = 0xffff;
+	t4 = rdtsc();
+	wrmsr(IA32_TSC_ADJUST, t3);
+	t2 = rdtsc();
+	t1 = rdmsr(IA32_TSC_ADJUST);
+	printf( "wrmsr IA32_TSC_ADJUST %lld, rdmsr IA32_TSC_ADJUST: %lld, rdtsc: %lld\n", t3, t1, t2);
+	lat = t2 - t4;
+	printf("rdtsc/wrmsr/rdtsc latency %lld\n", lat);
+	
+	return 0;
+}