locking of a subsystem (remove of spl calls)

[Gordon Bergling]

Hi,

I am about to write a special display driver, which should be something
like a framebuffer device, in terms of FreeBSD.

I whould like to make this driver from at the beginning MPSAFE, but I am
not sure that this is possible. Looking at some devices in sys/dev/fb and
sys/dev/syscons there are a lot of spl calls with make these drivers
require GIANT.

My question is now where to start.

Should I write my driver with spl calls or is there an MPSAFE way which
could I take?

And while I am here how hard whould it to get the looking of syscons
right. I have studied the source code for a while now and could take
this part. I am not sure about the other kernel subsystems like tty for
example. Whould it be possible to lock down syscons and maybe some
device in sys/dev/fb without a complete GIANT removal from the tty
subsystem?

best regards,

	Gordon

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Gordon Bergling <GBergling at 0xfce3.net>	      http://www.0xFCE3.net/
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