From: "Russ Cox" <rsc@swtch.com>
To: David.Eckhardt@cs.cmu.edu,
"Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: Re: [9fans] assert(*norealmode || *nomp)?
Date: Thu, 20 Jul 2006 15:10:44 -0700 [thread overview]
Message-ID: <ee9e417a0607201510s795c4b58o123c184895709e0f@mail.gmail.com> (raw)
In-Reply-To: <12728.1153429938@piper.nectar.cs.cmu.edu>
> Am I right in believing that due to the
> proliferation of single-processor
> motherboards with APICs that it's generally
> advisable for x86 machines to have either
> *norealmode=
> or
> *nomp=
> in PLAN9.INI?
No. The E820 scanner uses realmode and works
fine even on multiprocessors.
> Should the realmode code
> reject attempts to use it if the kernel
> has already gone down the APIC path?
> Are there other things (APM?) which should
> disable themselves?
Why would it be incompatible with APICs?
When we go to real mode we turn off interrupts
on the local processor.
Russ
prev parent reply other threads:[~2006-07-20 22:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-20 21:12 Dave Eckhardt
2006-07-20 22:10 ` Russ Cox [this message]
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