[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <alpine.LFD.1.10.0901151309420.5737@ftp.linux-mips.org>
Date: Thu, 15 Jan 2009 13:22:14 +0000 (GMT)
From: "Maciej W. Rozycki" <macro@...ux-mips.org>
To: Jan-Benedict Glaw <jbglaw@...-owl.de>
cc: Ingo Molnar <mingo@...e.hu>, Alan Cox <alan@...rguk.ukuu.org.uk>,
Peter Zijlstra <peterz@...radead.org>,
Jiri Kosina <jkosina@...e.cz>, Adam Osuchowski <adwol@...k.pl>,
linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...e.de>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Subject: Re: Is 386 processor still supported?
On Thu, 15 Jan 2009, Jan-Benedict Glaw wrote:
> * Debian's baseline libc is compiled to use LOCK and some other
> newish instructions that are not available on a real i386 CPU.
LOCK dates back to the 8086 -- it has to work with the i386. What is not
supported are the following i486 additions: CMPXCHG (amusingly enough
early i486 steppings used a different opcode for this one; no idea if it
is still possible to find such a CPU), XADD and BSWAP, the latter being
fairly unimportant.
> * There was a patch flying around to introduce a kernel-based
> emulator for those instructions. However, this was (at that time)
> neither included in Debian's kernel, nor in the upstream sources.
UP emulation of CMPXCHG and XADD for userland should be rather trivial,
so why not include it like with LL/SC for MIPS?
Maciej
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists