first real_time_clock impl

todo : setup_rtc_area should be called on startup


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9810 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/libroot/os/time.c

@@ -7,11 +7,35 @@
 #include <OS.h>
 #include "syscalls.h"
 
+static area_id	sCloneRtcArea;
+static volatile bigtime_t *sBootTime = NULL;
+
+
+status_t
+setup_rtc_area()
+{
+	area_id rtcArea = find_area("rtc_region");
+	if (rtcArea < 0) {
+		printf("setup_rtc_area: error finding rtc_region %s\n",
+			strerror(rtcArea));
+	}
+	sCloneRtcArea = clone_area("cloned_rtc_region", (void**)&sBootTime,
+		B_ANY_ADDRESS, B_READ_AREA, rtcArea);
+	if (sCloneRtcArea < 0) {
+		printf("setup_rtc_area: error cloning rtc_region\n");
+		return sCloneRtcArea;
+	}
+	
+	return B_OK;	
+}
+
 
 uint32
 real_time_clock(void)
 {
-	// ToDo: real_time_clock()
+	if (!sBootTime)
+		setup_rtc_area();
+	//return (*sBootTime + system_time()) / 1000000;
 	return 0;
 }
 
@@ -26,7 +50,9 @@ set_real_time_clock(uint32 secs)
 bigtime_t
 real_time_clock_usecs(void)
 {
-	// ToDo: real_time_clock_usecs()
+	if (!sBootTime)
+		setup_rtc_area();
+	//return *sBootTime + system_time();
 	return 0;
 }