include/clock.h

   1 /*
   2  * Copyright (c) 2007-2010 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22
  23 #ifndef __CLOCK_H
  24 #define __CLOCK_H
  25
  26 /*
  27  * The TOD hardware adds 1 to the 51st bit every microsecond
  28  * The timer hardware subtracts 1 from the 51st bit every microsecond
  29  */
  30 #define CLK_MICROSEC            0x1000UL
  31 #define CLK_SEC                 0xf4240000ULL
  32 #define CLK_MIN                 0x3938700000ULL
  33 #define CLK_HOUR                0xd693a400000ULL
  34 #define CLK_DAY                 0x141dd76000000ULL
  35 #define CLK_YEAR                0x1cae8c13e000000ULL
  36 #define CLK_FOURYEARS           0x72ce4e26e000000ULL
  37
  38 struct datetime {
  39         short int dy, dm, dd;
  40         short int th, tm, ts;
  41         u32 tmicro;
  42 };
  43
  44 extern struct datetime *parse_tod(struct datetime *dt, u64 tod);
  45
  46 static inline int get_tod(u64 *tod)
  47 {
  48         int cc;
  49
  50         asm volatile(
  51 #if 0
  52                 /*
  53                  * STCKF was added to the z9, and therefore generates a
  54                  * operation exception on any pre-z9 hardware.
  55                  *
  56                  * GNU as doesn't like stckf mnemonic, so let's just invoke
  57                  * it by hand.
  58                  */
  59                 ".insn  s,0xb27c0000,%0\n"
  60 #else
  61                 "stck   %0\n"
  62 #endif
  63                 "ipm    %1\n"
  64                 "srl    %1,28\n"
  65         : /* output */
  66           "=m" (*tod),
  67           "=d" (cc)
  68         : /* input */
  69         : /* clobber */
  70           "cc"
  71         );
  72
  73         return cc;
  74 }
  75
  76 static inline int get_parsed_tod(struct datetime *dt)
  77 {
  78         u64 tod;
  79         int ret;
  80
  81         ret = get_tod(&tod);
  82         if (!ret)
  83                 parse_tod(dt, tod);
  84
  85         return ret;
  86 }
  87
  88 static inline int leap_year(int year)
  89 {
  90         return (year % 4 == 0) && (year % 100 != 0 || year % 400 == 0);
  91 }
  92
  93 #endif