For your information.
----- Forwarded message from "H. Peter Anvin" <h...@zytor.com> -----
From: "H. Peter Anvin" <h...@zytor.com>
To: For discussion of Syslinux and tftp-hpa <sysli...@zytor.com>
Subject: Re: [syslinux] Syslinux 3.81-pre4 (RC): halt on idle included
Date: Thu, 21 May 2009 10:35:16 -0700
User-Agent: Thunderbird 2.0.0.14 (X11/20080501)
Reply-To: For discussion of Syslinux and tftp-hpa <sysli...@zytor.com>
Sebastian Herbszt wrote:
>
> Still same problem (IF=0) here with Qemu and Bochs and pxelinux
> (etherboot and gpxe rom).
> Syslinux works tho.
>
Oh, right. This is due to a serious bug in both Etherboot and gPXE (at
least until very recent ones) where they leave interrupts disabled after
INT 1Ah and INT 15h.
I have pushed out a -pre9 which works around this problem, plus added an
STI to reset_idle which should hopefully avoid the worst instances of
the same class of problems.
I now also dump an error and debugging message if interrupts are ever
off at do_idle time.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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HtH
GSt
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