Module Name: src
Committed By: riastradh
Date: Thu Nov 17 23:57:21 UTC 2022
Modified Files:
src/sys/dev/ic: pckbc.c
Log Message:
pckbc(4): Stop waiting 8us before reading each data byte.
This appears to have copied from pccons(4), where it was introduced
by mycroft@ in 1994 in sys/arch/i386/isa/pccons.c rev. 1.63 with the
commit message `Rename two files.'. No justification was given.
This delay was in a hard interrupt handler, and an MP-unsafe one to
boot, so it could hold up system responsiveness by delaying interrupt
handling and blocking other users of the legacy kernel lock.
The delay remains in the pckbc_wait_output loop to set a command
byte, which is not used in the interrupt path (and I suspect is used
only on boot during attach anyway).
To generate a diff of this commit:
cvs rdiff -u -r1.64 -r1.65 src/sys/dev/ic/pckbc.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
