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Re: [Xen-devel] [PATCH] x86/boot: Use mov to cr0 in preference to lmsw

>>> On 28.08.13 at 12:05, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> lmsw is for compability for 286 processors only, and any more modern
> processors are recomended to use mov to cr0.  Xen has never been capable of
> booting on a 286, given its multiboot entry.

I don't really mind this part (albeit it results in growth of the
trampoline code), but ...

> Furthermore, this avoids needless playing with the CD, NW and AM bits.  
> These do get explicitly chosen slightly later on boot.

... I clearly don't understand what you're referring to here: These
bits don't get modified by LMSW.


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