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FORK: QEMU emulator
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s390-tod.h (719B)

      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