linux-kernel - Re: [x86 setup 13/33] Header file to produce 16-bit code with gcc

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Date:	Tue, 10 Jul 2007 16:16:29 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	andi@...stfloor.org, akpm@...ux-foundation.org
Subject: Re: [x86 setup 13/33] Header file to produce 16-bit code with gcc

> gcc for i386 can be used with the assembly prefix ".code16gcc" to  
> generate
> 16-bit (real-mode) code.  This header file provides the assembly  
> prefix.

This only works correctly with newer GCCs if you pass the
-fno-toplevel-reorder option (and it only works on older
GCC versions by accident).  This option however disables
certain optimisations; but perhaps that doesn't matter all
that much here.


Segher

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