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| author | Robert Watson <rwatson@FreeBSD.org> | 2021-02-16 15:19:05 +0000 |
|---|---|---|
| committer | Robert Watson <rwatson@FreeBSD.org> | 2021-02-25 21:38:30 +0000 |
| commit | bbcdd9faca55758b228b949f1c1bb41b85e90a8e (patch) | |
| tree | a1adcd07fbafe9ce762710ab7161a6184df12288 /crypto | |
| parent | cf9829d98dc771f9ca0696e493dc3bb635999536 (diff) | |
| download | src-bbcdd9faca55758b228b949f1c1bb41b85e90a8e.tar.gz src-bbcdd9faca55758b228b949f1c1bb41b85e90a8e.zip | |
Reimplemen FreeBSD/arm64 dtrace_gethrtime() to use the system timer.
dtrace_gethrtime() is the high-resolution nanosecond timestemp used
for the DTrace 'timestamp' built-in variable. The new implementation
uses the EL0 cycle counter and frequency registers in ARMv8-A. This
replaces a previous implementation that relied on an
instrumentation-safe implementation of getnanotime(), which provided
only timer resolution.
Approved by: re (gjb)
Reviewed by: andrew, bsdimp (older version)
Useful comments appreciated: jrtc27, emaste
Differential Revision: https://reviews.freebsd.org/D28723
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions