This library implements portable support for an operating system timesource that is compatible with the MirageOS library interfaces found in: https://github.com/mirage/mirage
It implements a Mirage_mtime module that represents a monotonic timesource
since an arbitrary point.
The following sources are used:
- The Unix version uses Mtime_clock,
- The freestanding version uses the paravirtual clock source from the hypervisor.