[Xen-devel] [PATCH v2 2/7] add current_time function to time manager

[Paul Semel <semelpaul@xxxxxxxxx>]

From: Paul Semel <phentex@xxxxxxxxx>

this function returns the "epoch" time

Signed-off-by: Paul Semel <phentex@xxxxxxxxx>
---
 common/time.c      | 18 ++++++++++++++++++
 include/xtf/time.h |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/common/time.c b/common/time.c
index a0f53bf..3e8e8ce 100644
--- a/common/time.c
+++ b/common/time.c
@@ -3,6 +3,7 @@
 #include <xtf/time.h>
 
 #include <arch/barrier.h>
+#include <arch/div.h>
 
 /* This function was taken from mini-os source code */
 /* It returns ((delta << shift) * mul_frac) >> 32 */
@@ -69,6 +70,23 @@ uint64_t since_boot_time(void)
     return system_time;
 }
 
+/* This function return the epoch time (number of seconds elapsed
+ * since Juanary 1, 1970) */
+uint64_t current_time(void)
+{
+    uint64_t seconds;
+    uint64_t boot_time = since_boot_time();
+#if defined(__i386__)
+    seconds = (uint64_t)ACCESS_ONCE(shared_info.wc_sec);
+    divmod64(&boot_time, 1000000000);
+#else
+    seconds = ((uint64_t)ACCESS_ONCE(shared_info.wc_sec_hi) << 32)
+              | ACCESS_ONCE(shared_info.wc_sec);
+    boot_time /= 1000000000;
+#endif
+    return seconds + boot_time;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/include/xtf/time.h b/include/xtf/time.h
index 7d46d3a..6195b24 100644
--- a/include/xtf/time.h
+++ b/include/xtf/time.h
@@ -18,6 +18,8 @@
 /* Time from boot in nanoseconds */
 uint64_t since_boot_time(void);
 
+uint64_t current_time(void);
+
 #endif /* XTF_TIME_H */
 
 /*
-- 
2.16.1


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