From: Jim Cromie <jim.cromie@domain.hid>
To: xenomai-core <xenomai@xenomai.org>
Subject: [Xenomai-core] /proc/cpuinfo missing sep - closure
Date: Tue, 18 Apr 2006 12:16:27 -0400 [thread overview]
Message-ID: <444510DB.6030704@domain.hid> (raw)
just to follow up:
I built a xeno-kernel for my laptop, the sep flag was on,
so it was Fedora specific. I asked on fedora-list,
got this answer:
> This is pretty obscure, and I havent seen any problems because of it,
> but it is a bit odd.
>
> Can someone(s)
> - confirm its absence on 2.6.16-1.2069_FC4 or other
> - check their FC-5 /proc/cpuinfo, and report back.
> - explain why this is a good thing, or how it might have happened
> accidentally ?
SEP is incompatible with segment-based NX emulation provided
by exec-shield in the Fedora kernel.
The reason for this is that a SYSRET resets the segment limits.
I presume this distinction is well hidden inside glibc etc..
reply other threads:[~2006-04-18 16:16 UTC|newest]
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