linux-kernel - Re: [PATCH 1/3] x86_64: further cleanup of 32-bit compat syscall mechanisms

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Message-ID: <487A963E.6040307@kernel.org>
Date:	Sun, 13 Jul 2008 16:56:46 -0700
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH 1/3] x86_64: further cleanup of 32-bit compat syscall
 mechanisms

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@...rix.com>

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

	-hpa

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