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

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Message-ID: <AANLkTik1cjxh1ItnqBXaxNcwa6we7ccJJZny-mAOAUjD@mail.gmail.com>
Date:	Wed, 2 Jun 2010 19:47:17 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Justin P. Mattock" <justinmattock@...il.com>, 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 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?
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