include/clock.h

   1 /*
   2  * (C) Copyright 2007-2010  Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   3  *
   4  * This file is released under the GPLv2.  See the COPYING file for more
   5  * details.
   6  */
   7
   8 #ifndef __CLOCK_H
   9 #define __CLOCK_H
  10
  11 /*
  12  * The TOD hardware adds 1 to the 51st bit every microsecond
  13  * The timer hardware subtracts 1 from the 51st bit every microsecond
  14  */
  15 #define CLK_MICROSEC            0x1000UL
  16 #define CLK_SEC                 0xf4240000ULL
  17 #define CLK_MIN                 0x3938700000ULL
  18 #define CLK_HOUR                0xd693a400000ULL
  19 #define CLK_DAY                 0x141dd76000000ULL
  20 #define CLK_YEAR                0x1cae8c13e000000ULL
  21 #define CLK_FOURYEARS           0x72ce4e26e000000ULL
  22
  23 struct datetime {
  24         short int dy, dm, dd;
  25         short int th, tm, ts;
  26         u32 tmicro;
  27 };
  28
  29 extern struct datetime *parse_tod(struct datetime *dt, u64 tod);
  30
  31 static inline int get_tod(u64 *tod)
  32 {
  33         int cc;
  34
  35         asm volatile(
  36 #if 0
  37                 /*
  38                  * STCKF was added to the z9, and therefore generates a
  39                  * operation exception on any pre-z9 hardware.
  40                  *
  41                  * GNU as doesn't like stckf mnemonic, so let's just invoke
  42                  * it by hand.
  43                  */
  44                 ".insn  s,0xb27c0000,%0\n"
  45 #else
  46                 "stck   %0\n"
  47 #endif
  48                 "ipm    %1\n"
  49                 "srl    %1,28\n"
  50         : /* output */
  51           "=m" (*tod),
  52           "=d" (cc)
  53         : /* input */
  54         : /* clobber */
  55           "cc"
  56         );
  57
  58         return cc;
  59 }
  60
  61 static inline int get_parsed_tod(struct datetime *dt)
  62 {
  63         u64 tod;
  64         int ret;
  65
  66         ret = get_tod(&tod);
  67         if (!ret)
  68                 parse_tod(dt, tod);
  69
  70         return ret;
  71 }
  72
  73 static inline int leap_year(int year)
  74 {
  75         return (year % 4 == 0) && (year % 100 != 0 || year % 400 == 0);
  76 }
  77
  78 #endif