linux-kernel - Re: How to move two valuables to x86 CPU register ebx, ecx by using AT&A inline asm.

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Message-ID: <4B065712.4050202@gmail.com>
Date:	Fri, 20 Nov 2009 09:45:06 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Johnny Hung <johnny.hacking@...il.com>
CC:	kernelnewbies@...linux.org, linux-kernel@...r.kernel.org,
	linux-embedded@...r.kernel.org
Subject: Re: How to move two valuables to x86 CPU register ebx, ecx by using
 AT&A 	inline asm.

On 11/19/2009 10:50 AM, Johnny Hung wrote:
> Hi All:
>     I want to move two local valuables to x86 arch CPU ebx, ecx
> register and do outb cpu instruction by using AT&A inline asm in
> kernel driver.  The following code was I wrote but gcc report syntax
> error:
> ==
>     unsigned int val = 10;
>     unsigned int tmp = 5;
>     ....
>     __asm__ volatile ("movl %0, %%ebx"
>           "movl %1, %%ecx"
>           "outb $0x27, $0xb2"
>           :
>           :"r"(val), "r"(tmp)
>           :"%ebx", "%ecx"
>    );
> 
> Does anyone can point me out. Any reply is appreciated.

Why not just:
("outb $0x27, %%al" : : "a" (0xb2), "b"(val), "c" (tmp));
-- 
js
Faculty of Informatics, Masaryk University
Suse Labs, Novell
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