Date: Sun, 17 Sep 2000 03:33:17 -0400 From: Jonathan Chen <jon@spock.org> To: freebsd-hackers@freebsd.org Subject: VM86 interrupt calls from userland Message-ID: <20000917033317.A41735@spock.org>
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Is there a way to make VM86 interrupt calls from userland? The reason I'm
asking is that in order to get my video card (Savage/IX) working in X
properly, I need to make a couple of VESA int10 calls (or somehow obtain
the programming specs for the card and do this the right way). Anyway,
what I have tried is using the syscons ioctl()'s, which doesn't work here.
Right now what I've done is modified src/sys/i386/i386/vm86.c to enable the
VM86_INTCALL bit (and added a check for uid), and just called i386_vm86
from userland. This seems to work fine, but I want to know
1) Is there already some standard way to do this that I missed? The man
page for i386_vm86 mentions sigreturn(), but I'm not sure if that will
do what I want, plus I don't know how to use it anyway...
2) There was probably a reason the VM86_INTCALL stuff was #if'ed out... but
I looked around the lists and cvs logs to see if one was mentioned and
found none. This seems to work and I don't see how anything bad could
come from this -- is it possible that this be enabled by default?
3) Or would the whole problem be solved more correctly by extending the
ioctl by adding something like FBIO_SETMODE_ONLY where syscons would
only switch the mode and not bother setting up the renderer or emulator?
Thanks for any pointers...
--
(o_ 1-2-1-2-1-2-1-2-1-2-1-2-1-2-1-2-1-2-1-2-1-2-1-2-1-2-1-2-1-2 _o)
\\\_\ Jonathan Chen jon@spock.org /_///
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