Date: Sat, 24 Dec 1994 21:39:33 +1100 From: Bruce Evans <bde@zeta.org.au> To: freebsd-hackers@freebsd.org, hosokawa@mt.cs.keio.ac.jp Subject: Re: DX4/100 BUG Message-ID: <199412241039.VAA02440@godzilla.zeta.org.au>
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>I heard Linux checks DX4/100 bug on bootstrap and is getting along
>with this bug. It does not use HLT instruction on such machines. I
>read swtch.s and locore.s of 2.0R, but I couldn't find any measures
>against this bug. I don't know whether this bug is easily compensated
>since I have no Linux machines. Is it easy?
It's easy to ifdef the HLT instruction or to overwrite it with a NOP
in the kernel binary. Linux tests if HLT works and runs essentially
if (hlt_works_ok)
__asm("hlt");
in the idle loop.
Bruce
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