CVS commit: src/sys/dev/wscons

["Michael Lorenz" <macallan%netbsd.org@localhost>]

Module Name:    src
Committed By:   macallan
Date:           Tue Jan 25 20:28:21 UTC 2011

Modified Files:
        src/sys/dev/wscons: files.wscons wsdisplay_vcons.c wsdisplay_vconsvar.h

Log Message:
Add support for asynchronous drawing in vcons.
This is not finished but good enough for others to play with, enable with
options VCONS_DRAW_ASYNC
With this all drawing operations will be posted to a ring buffer instead
of being run directly, and run by a kernel thread. This avoids having to wait
for drawing operations to finish with the kernel lock held ( to a degree at
least ) and scrolling a (slow) framebuffer console should not disrupt other
operations anymore.
Problems:
- we need to switch back to synchronous operations when panicing or entering
  ddb, also re-enable async drawing when leaving ddb
- there are still occasional glitches
tested on an SS20 with cg14 and cg6 for dumb and accelerated cases


To generate a diff of this commit:
cvs rdiff -u -r1.41 -r1.42 src/sys/dev/wscons/files.wscons
cvs rdiff -u -r1.18 -r1.19 src/sys/dev/wscons/wsdisplay_vcons.c
cvs rdiff -u -r1.12 -r1.13 src/sys/dev/wscons/wsdisplay_vconsvar.h

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