linux-kernel - Re: RFD: x32 ABI system call numbers

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Message-ID: <4E5C6ADA.3030409@zytor.com>
Date:	Mon, 29 Aug 2011 21:45:14 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kyle Moffett <kyle@...fetthome.net>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"H.J. Lu" <hjl.tools@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: RFD: x32 ABI system call numbers

On 08/29/2011 07:16 PM, Kyle Moffett wrote:
> 
> The goal of x32 as I understand it is to allow 32-bit x86 programs to
> use all the nifty extra registers and faster instructions (IE: syscall)
> without needing to deal with the 2x memory overhead of 64-bit
> pointers.
> 

That is the major goal.  A minor goal is to bring x86-64 goodness to
those who have an (irrational) fear of 64 bits thinking it is a major
porting effort.  Thus, *source-level* porting effort matters, but it is
completely subordinate to the major goal.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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