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: <cb9ecdfa0911190219r11fa165v331a590889edcfd0@mail.gmail.com>
Date:	Thu, 19 Nov 2009 18:19:55 +0800
From:	Johnny Hung <johnny.hacking@...il.com>
To:	Viral Mehta <viral.mehta@...fochips.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.

It doesn't works. :(

2009/11/19 Viral Mehta <viral.mehta@...fochips.com>:
> How about putting \n at the end ?
>
> Just try out,
>
> __asm__ volatile ("movl %0, %%ebx\n"
>         "movl %1, %%ecx\n"
>
>
>
>
> Thanks,
> Viral Mehta,
> Embedded Software Engineer,
> Tel. No. 91 79 26563705, Ext. 423
> www.einfochips.com <http://www.einfochips.com>
> Prepare and Prevent rather than Repair and Repent
>
>
> 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.
>>
>> BRs, H. Johnny
>>
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