* [9fans] vga vesa works on mp pc
@ 2009-12-09 0:05 geoff
2009-12-09 1:21 ` Venkatesh Srinivas
0 siblings, 1 reply; 4+ messages in thread
From: geoff @ 2009-12-09 0:05 UTC (permalink / raw)
To: 9fans
I've just pushed out a small change to /sys/src/9/pc/realmode.c that
allows monitor=vesa to work on multiprocessor pcs without *nomp being
defined in plan9.ini (i.e., you can use all available processors [or
cores] and still use vesa mode). I've also pushed out new kernels, so
the distribution built tonight should include this fix.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] vga vesa works on mp pc
2009-12-09 0:05 geoff
@ 2009-12-09 1:21 ` Venkatesh Srinivas
2009-12-09 2:27 ` geoff
0 siblings, 1 reply; 4+ messages in thread
From: Venkatesh Srinivas @ 2009-12-09 1:21 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
On Tue, Dec 8, 2009 at 7:05 PM, <geoff@plan9.bell-labs.com> wrote:
> I've just pushed out a small change to /sys/src/9/pc/realmode.c that
> allows monitor=vesa to work on multiprocessor pcs without *nomp being
> defined in plan9.ini (i.e., you can use all available processors [or
> cores] and still use vesa mode). I've also pushed out new kernels, so
> the distribution built tonight should include this fix.
Cool, thanks!
If I read this right, you turn off interrupts on just the CPU
executing in realmode. Is the really all that had to be done for vesa
to support MP systems?
-- vs
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] vga vesa works on mp pc
2009-12-09 1:21 ` Venkatesh Srinivas
@ 2009-12-09 2:27 ` geoff
0 siblings, 0 replies; 4+ messages in thread
From: geoff @ 2009-12-09 2:27 UTC (permalink / raw)
To: me, 9fans
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As far as I can tell, yes, that's all it took.
The old code had been turning off the old 8259 interrupt controllers
used by uniprocessors but didn't disable the lapic on mp systems.
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From: Venkatesh Srinivas <me@acm.jhu.edu>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] vga vesa works on mp pc
Date: Tue, 8 Dec 2009 20:21:18 -0500
Message-ID: <f75780240912081721o1b706b89wfe71973a125af34e@mail.gmail.com>
On Tue, Dec 8, 2009 at 7:05 PM, <geoff@plan9.bell-labs.com> wrote:
> I've just pushed out a small change to /sys/src/9/pc/realmode.c that
> allows monitor=vesa to work on multiprocessor pcs without *nomp being
> defined in plan9.ini (i.e., you can use all available processors [or
> cores] and still use vesa mode). I've also pushed out new kernels, so
> the distribution built tonight should include this fix.
Cool, thanks!
If I read this right, you turn off interrupts on just the CPU
executing in realmode. Is the really all that had to be done for vesa
to support MP systems?
-- vs
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2009-12-09 2:27 UTC | newest]
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2009-12-09 0:37 ` [9fans] vga vesa works on mp pc erik quanstrom
2009-12-09 0:05 geoff
2009-12-09 1:21 ` Venkatesh Srinivas
2009-12-09 2:27 ` geoff
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