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| author | Michael Brown | 2016-05-11 22:44:23 +0200 |
|---|---|---|
| committer | Michael Brown | 2016-05-12 12:16:41 +0200 |
| commit | 601706688bbb5502538627feb92752760d0d9f24 (patch) | |
| tree | c5d2c0b3038f1ddc70a1a5306dcfcf4de93cbaad /src/drivers/net/ath | |
| parent | [efi] Guard against GetStatus() failing to return a NULL TX buffer (diff) | |
| download | ipxe-601706688bbb5502538627feb92752760d0d9f24.tar.gz ipxe-601706688bbb5502538627feb92752760d0d9f24.tar.xz ipxe-601706688bbb5502538627feb92752760d0d9f24.zip | |
[arm] Use CNTVCT_EL0 as profiling timestamp
The raw cycle counter at PMCCNTR_EL0 works in qemu but seems to always
read as zero on physical hardware (tested on Juno r1 and Cavium
ThunderX), even after ensuring that PMCR_EL0.E and PMCNTENSET_EL0.C
are both enabled.
Use CNTVCT_EL0 instead; this seems to count at a lower resolution
(tens of CPU cycles), but is usable for profiling.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/drivers/net/ath')
0 files changed, 0 insertions, 0 deletions