[Xen-devel] [XTF PATCH v2 2/3] vlapic-timer: Test divide register configuration

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 arch/x86/include/arch/apic.h |  3 +++
 tests/vlapic-timer/main.c    | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/arch/x86/include/arch/apic.h b/arch/x86/include/arch/apic.h
index 4cb262d..0f48df1 100644
--- a/arch/x86/include/arch/apic.h
+++ b/arch/x86/include/arch/apic.h
@@ -31,6 +31,9 @@
 
 #define APIC_TMICT      0x380
 #define APIC_TMCCT      0x390
+#define APIC_TDCR       0x3e0
+#define   APIC_TDR_DIV_1          0xb
+#define   APIC_TDR_DIV_16         0x3
 
 
 #define APIC_DEFAULT_BASE 0xfee00000ul
diff --git a/tests/vlapic-timer/main.c b/tests/vlapic-timer/main.c
index 47836a8..19f47d7 100644
--- a/tests/vlapic-timer/main.c
+++ b/tests/vlapic-timer/main.c
@@ -130,6 +130,44 @@ void testing_oneshot_and_periodic_mode(void)
         xtf_failure("Fail: TMCCT should stay at zero\n");
 }
 
+/*
+ * Testing change of divide configuration
+ */
+void testing_divide_configuration(void)
+{
+    uint32_t tmict = 0x49999999;
+
+    printk("Testing change of divide configuration register\n");
+
+    change_mode(APIC_TIMER_MODE_PERIODIC);
+
+    apic_write(APIC_TDCR, APIC_TDR_DIV_16);
+    apic_write(APIC_TMICT, tmict);
+
+    wait_until_tmcct_is_half_down(tmict);
+
+    apic_write(APIC_TDCR, APIC_TDR_DIV_1);
+
+    /*
+     * Checking that changing divide configuration value does not cause the
+     * current counter register to have a different value, it should continue
+     * to count down, but at a different rate.
+     */
+
+    if ( apic_read(APIC_TMCCT) > (tmict / 2) )
+        xtf_failure("Fail: TMCCT may have gone back in time\n");
+    if ( apic_read(APIC_TMCCT) == 0 )
+        xtf_failure("Fail: TMCCT should not be 0\n");
+
+    wait_until_tmcct_is_half_down(tmict);
+
+    apic_write(APIC_TDCR, APIC_TDR_DIV_16);
+    if ( apic_read(APIC_TMCCT) > (tmict / 2) )
+        xtf_failure("Fail: TMCCT may have gone back in time\n");
+    if ( apic_read(APIC_TMCCT) == 0 )
+        xtf_failure("Fail: TMCCT should not be 0\n");
+}
+
 void test_main(void)
 {
     if ( apic_init(APIC_MODE_XAPIC) )
@@ -137,6 +175,8 @@ void test_main(void)
 
     testing_oneshot_and_periodic_mode();
 
+    testing_divide_configuration();
+
     xtf_success(NULL);
 }
 
-- 
Anthony PERARD


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