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 30