linux-kernel - Re: [PATCH]X86:reboot.c Add some dmi entries to pci_reboot_dmi

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Date:	Wed, 02 Jun 2010 19:16:26 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Robert Hancock <hancockrwd@...il.com>
CC:	Matthew Garrett <mjg59@...f.ucam.org>, x86@...nel.org,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]X86:reboot.c Add some dmi entries to pci_reboot_dmi_table.

On 06/02/2010 07:05 PM, Robert Hancock wrote:
> On Wed, Jun 2, 2010 at 8:00 PM, Justin P. Mattock
> <justinmattock@...il.com>  wrote:
>> On 06/02/2010 06:47 PM, Robert Hancock wrote:
>>>
>>> On Wed, Jun 2, 2010 at 7:37 PM, Matthew Garrett<mjg59@...f.ucam.org>
>>>   wrote:
>>>>
>>>> On Wed, Jun 02, 2010 at 05:27:22PM -0700, Justin P. Mattock wrote:
>>>>>
>>>>> On 06/02/2010 05:20 PM, Robert Hancock wrote:
>>>>>>
>>>>>> #include<unistd.h>
>>>>>>
>>>>>> int main() {
>>>>>>           iopl(3);
>>>>>>           outb(2, 0xcf9);
>>>>>>           sleep(1);
>>>>>>           outb(6, 0xcf9);
>>>>>>           return 0;
>>>>>> }
>>>>>>
>>>>>> That's basically what PCI reboot does.
>>>>>
>>>>> the above code reboot's the machine as it should..
>>>>> I can look at that(need to take a break first though)
>>>>> and see..
>>>>
>>>> That's pretty infuriating. The ACPI-provided definition doesn't work,
>>>> and there's no ACPI mechanism for expressing the more complex cf9
>>>> behaviour. Windows doesn't appear to special case this, so we're
>>>> probably left trying to figure out why the keyboard controller method
>>>> doesn't work. Sigh.
>>>
>>> Do these Macs even have a PC keyboard controller? A recent thread on
>>> PS/2 keyboard/mouse controller probing suggests they may not..
>>>
>>> Justin, what happens if you try the simple outb(6, 0xcf9) test program
>>> multiple times, does that do anything?
>>>
>>
>>
>> this reboots the system
>>
>>
>> int main() {
>>            iopl(3);
>>            outb(6, 0xcf9);
>>            return 0;
>> }
>
> On a single try, or multiple times? (You tried that one before once
> and it didn't work, right?)
>

yeah single try. then I rebooted
and it was like dead or something.

Justin P. Mattock
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