CVS commit: src/sys/arch/arm/cortex

["Jared D. McNeill" <jmcneill%netbsd.org@localhost>]

Module Name:    src
Committed By:   jmcneill
Date:           Sun Feb  7 21:24:50 UTC 2021

Modified Files:
        src/sys/arch/arm/cortex: gicv3.c

Log Message:
Optimize hardware priority updates.

In gicv3_set_priority, read the current priority mask and only update it
if we are lowering the priority. The hardware priority filter is raised
only after taking an interrupt. This makes splfoo/splx without an interrupt
in between considerably cheaper as PMR writes are relatively expensive
compared to reads.

While here, avoid an extra daif read when dispatching interrupts by using
ENABLE_INTERRUPT() / DISABLE_INTERRUPT() instead of cpsie() / cpsid() macros.


To generate a diff of this commit:
cvs rdiff -u -r1.39 -r1.40 src/sys/arch/arm/cortex/gicv3.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.