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SubjectRe: reboot via bios on X86_64?
H. Peter Anvin wrote:
> On 04/09/2012 10:26 AM, Miles Fidelman wrote:
>> Thanks for the quick response.
>>
>> Matthew Garrett wrote:
>>> On Mon, Apr 09, 2012 at 11:39:32AM -0400, Miles Fidelman wrote:
>>>
>>>> 1. What's the logic behind this? Why not enable a bios reboot for 64bit
>>>> kernels? Is there any reason why the machine_real_restart code wouldn't
>>>> work just as well in 64bit mode? Anybody know the history?
>>> The bios reboot code requires you to reprogram the CPU to real mode. I
>>> don't think there's any fundamental reason you can't do that from 64-bit
>>> mode, but nobody's ever written that code.
>> That would explain it. I guess there's a little bit of trickiness
>> involved in setting things up before
>> switching to real mode.
>>
> Actually this code already exists; the difference is that we have to
> return to 32-bit mode first.
ahhh.... ain't things fun when one gets really close to the hardware



--
In theory, there is no difference between theory and practice.
In practice, there is. .... Yogi Berra




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