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

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Date:	Wed, 02 Jun 2010 17:27:22 -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 05:20 PM, Robert Hancock wrote:
> On Wed, Jun 2, 2010 at 6:05 PM, Justin P. Mattock
> <justinmattock@...il.com>  wrote:
>>>>> Hmm, so the FADT says the reset register is listed as supported, and
>>>>> says writing 0x06 to 0xCF9 is supposed to do it.. That's exactly what
>>>>> this should do:
>>>>>
>>>>> #include<sys/io.h>
>>>>>
>>>>> int main() {
>>>>> iopl(3);
>>>>> outb(6, 0xcf9);
>>>>> return 0;
>>>>> }
>>>>>
>>>>> but you said that didn't do anything.. It kind of seems like ACPI
>>>>> reboot is busted on this machine then, but then I wonder how Windows
>>>>> manages to work..
>>>>>
>>>>
>>>>
>>>> alright!! I have a better idea at what this is now..
>>>> as for the above code, yes this one segfaults,
>>>> the other code posted on the thread just returns
>>>> a command prompt(testing:
>>>
>>> You get a segfault on that one? Running as root?
>>>
>>
>> my bad(tired)I left out iopl(3);
>> in the code which was giving a segfault.
>>
>> running the below code(s) just gives a command prompt
>>
>> int main() {
>>         iopl(3);
>>         outb(0xfe, 0xcf9);
>>         return 0;
>> }
>>
>> int main() {
>>         iopl(3);
>>         outb(6, 0xcf9);
>>         return 0;
>> }
>
> What if you do:
>
> #include<unistd.h>
>
> int main() {
>          iopl(3);
>          outb(2, 0xcf9);
>          sleep(1);
>          outb(6, 0xcf9);
>          return 0;
> }
>
> That's basically what PCI reboot does.
>
> It's possible it doesn't take the first time - you could try modifying
> drivers/acpi/reboot.c to call acpi_reset in a loop instead of just
> trying once (assuming you have the patch to default to ACPI reboot
> enabled).
>

the above code reboot's the machine as it should..
I can look at that(need to take a break first though)
and see..

what about the whole kbd mechanism(0x64) give the info I provided
does it look possible, or is this machine strictly on cf9?

cheers,

Justin P. Mattock
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