Messages in this thread | | | Date | Fri, 14 Feb 2003 15:25:15 +0100 (MET) | From | Peter Finderup Lund <> | Subject | Re: [discuss] Re: [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance) |
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On Fri, 14 Feb 2003, Robert Dewar wrote:
> > > The only way to get from long-mode back to legacy-mode is to reset the > > > processor. It can be done in software but you will likely lose interrupts. > > > > Smartdrv.sys and triple-faults come back, all is forgiven! ;) > > I have an idea, perhaps we can make the keyboard controller recognize a special > command that will reset the processor :-) :-)
What if there was an undocumented instruction otherwise only used for testing and CPU in-circuit-emulation to load all the internal state of the CPU from memory? Maybe that would work?
-Peter
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