target/s390x/s390-tod.h

   1 /*
   2  * TOD (Time Of Day) clock
   3  *
   4  * Copyright 2018 Red Hat, Inc.
   5  * Author(s): David Hildenbrand <david@redhat.com>
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   8  * See the COPYING file in the top-level directory.
   9  */
  10
  11 #ifndef TARGET_S390_TOD_H
  12 #define TARGET_S390_TOD_H
  13
  14 /* The value of the TOD clock for 1.1.1970. */
  15 #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
  16
  17 /* Converts ns to s390's clock format */
  18 static inline uint64_t time2tod(uint64_t ns)
  19 {
  20     return (ns << 9) / 125 + (((ns & 0xff80000000000000ull) / 125) << 9);
  21 }
  22
  23 /* Converts s390's clock format to ns */
  24 static inline uint64_t tod2time(uint64_t t)
  25 {
  26     return ((t >> 9) * 125) + (((t & 0x1ff) * 125) >> 9);
  27 }
  28
  29 #endif