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

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Message-ID: <AANLkTin-x9bkzWO6jgKd4dbB10uzhbJQUlN9rnGnFHFI@mail.gmail.com>
Date:	Thu, 3 Jun 2010 08:43:11 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	"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 Thu, Jun 3, 2010 at 3:54 AM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> On Thu, 3 Jun 2010 03:18:51 +0100
> Matthew Garrett <mjg59@...f.ucam.org> wrote:
>
>> On Wed, Jun 02, 2010 at 07:15:36PM -0700, Justin P. Mattock wrote:
>> > as soon as I change:
>> >
>> > int main() {
>> >     iopl(3);
>> >     outb(6, 0xcf9);
>> >     usleep(100);
>> >     outb(6, 0xcf9);
>> >     return 0;
>> > }
>> > (the above gave a command prompt
>> > with numerous tries)
>>
>> Ok, so it's not that straghtforward. Sigh. There's various hacky
>> workarounds we could do here, but Windows doesn't seem to do them so I
>> lean towards suspecting that there's something wrong with our keyboard
>> controller reboot mechanism. I'll try doing some more tracing.
>
> At least some PCs you need to issue the reboot outb calls on the boot
> processor so the userspace tests won't be reliable.

In that case you could presumably run them:

taskset 0x00000001 (program name)

and see if that changes anything.
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