| 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 |