Mercurial > sos > sos

changeset 17:d3c54eb7510b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
tod: more docs
author Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
date Thu, 10 Mar 2011 15:47:37 -0500
parents a4d737f03f88
children 43275cae082f d24d69066fc0
files include/tod.h
diffstat 1 files changed, 35 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/include/tod.h	Wed Mar 09 18:39:54 2011 -0500
+++ b/include/tod.h	Thu Mar 10 15:47:37 2011 -0500
@@ -2,9 +2,42 @@
 #define __TOD_H
 
 /*
- * The Time Of Day (TOD) hardware adds 1 to the 51st bit every microsecond
- * The timer hardware subtracts 1 from the 51st bit every microsecond
+ * The Time Of Day (TOD) hardware adds 1 to the 51st bit every microsecond.
+ * The TOD value 0 is defined as 00:00:00 on Jan 1, 1900.
+ *
+ * Here are the TOD values for each of the leap seconds, as well as the
+ * beginning of UTC (Jan 1, 1970).
+ *
+ * Year  Month  Day  Leap Sec.  Clock Setting (Hex)
+ * ------------------------------------------------
+ * 1900      1    1       N/A   0000 0000 0000 0000
+ * 1972      1    1       N/A   8126 D60E 4600 0000
+ * 1972      7    1         1   820B A981 1E24 0000
+ * 1973      1    1         2   82F3 00AE E248 0000
+ * 1974      1    1         3   84BD E971 146C 0000
+ * 1975      1    1         4   8688 D233 4690 0000
+ * 1976      1    1         5   8853 BAF5 78B4 0000
+ * 1977      1    1         6   8A1F E595 20D8 0000
+ * 1978      1    1         7   8BEA CE57 52FC 0000
+ * 1979      1    1         8   8DB5 B719 8520 0000
+ * 1980      1    1         9   8F80 9FDB B744 0000
+ * 1981      7    1        10   9230 5C0F CD68 0000
+ * 1982      7    1        11   93FB 44D1 FF8C 0000
+ * 1983      7    1        12   95C6 2D94 31B0 0000
+ * 1985      7    1        13   995D 40F5 17D4 0000
+ * 1988      1    1        14   9DDA 69A5 57F8 0000
+ * 1990      1    1        15   A171 7D06 3E1C 0000
+ * 1991      1    1        16   A33C 65C8 7040 0000
+ * 1992      7    1        17   A5EC 21FC 8664 0000
+ * 1993      7    1        18   A7B7 0ABE B888 0000
+ * 1994      7    1        19   A981 F380 EAAC 0000
+ * 1996      1    1        20   AC34 336F ECD0 0000
+ * 1997      7    1        21   AEE3 EFA4 02F4 0000
+ * 1999      1    1        22   B196 2F93 0518 0000
+ * 2006      1    1        23   BE25 1097 973C 0000
+ * 2009      1    1        24   C387 0CB9 BB60 0000
  */
+
 #define TOD_MICROSEC		0x0000000000001000UL
 #define TOD_SEC			0x0000000f4240000ULL
 #define TOD_MIN			0x000003938700000ULL