CVSROOT: /cvs
Module name: src
Changes by: chel...@cvs.openbsd.org 2022/11/08 10:56:38
Modified files:
sys/arch/arm64/dev: agtimer.c
sys/arch/arm64/include: cpu.h _types.h
Log message:
arm64: switch to clockintr(9)
Switch arm64 to the clockintr(9) subsystem.
- Remove the custom per-CPU clock interrupt schedule from agtimer(4).
- Remove the custom randomized statclock() pieces from agtimer(4).
- Add agtimer_rearm(), agtimer_trigger(), and wire up agtimer_intrclock.
There is one wart:
- The AArch64 spec says that a value written to CNTV_TVAL_EL0 is
"treated as a signed 32-bit integer" [1]. kettenis@ doesn't know
what to make of this. I'm capping the value at INT32_MAX for
now. It's possible I am misreading this, though.
Tested by kettenis@ on his Apple M1 mini. Tested by me on my
Raspberry Pi 4B.
Link: https://marc.info/?l=openbsd-tech&m=166776342503304&w=2
[1] "Arm Architecture Reference Manual for A-profile architecture"
issue I.a, section D17.11.27 ("CNTV_TVAL_EL0").
ok kettenis@
