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From: "H. Peter Anvin" <hpa@kernel.org>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Ingo Molnar <mingo@elte.hu>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	the arch/x86 maintainers <x86@kernel.org>
Subject: Re: [PATCH 1/3] x86_64: further cleanup of 32-bit compat syscall mechanisms
Date: Sun, 13 Jul 2008 16:56:46 -0700	[thread overview]
Message-ID: <487A963E.6040307@kernel.org> (raw)
In-Reply-To: <487877B8.8010505@goop.org>

Jeremy Fitzhardinge wrote:
> AMD only supports "syscall" from 32-bit compat usermode.
> Intel and Centaur(?) only support "sysenter" from 32-bit compat usermode.
> 
> Set the X86 feature bits accordingly, and set up the vdso in
> accordance with those bits.  On the offchance we run on in a 64-bit
> environment which supports neither syscall nor sysenter from 32-bit
> mode, then fall back to the int $0x80 vdso.
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

Acked-by: H. Peter Anvin <hpa@zytor.com>

	-hpa


  reply	other threads:[~2008-07-14  0:00 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-12  9:22 [PATCH 1/3] x86_64: further cleanup of 32-bit compat syscall mechanisms Jeremy Fitzhardinge
2008-07-13 23:56 ` H. Peter Anvin [this message]
2008-07-14 21:59   ` Jeremy Fitzhardinge
2008-07-14 22:19     ` H. Peter Anvin

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