Re: PAGE_OFFSET > 2^48

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#72738

From: porparek
Date: Sat, 18 Jul 2015 09:56

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On Saturday, July 18, 2015 at 11:43:39 AM UTC+2, porp...@gmail.com wrote:
> Hi
> I can see that on x86_64 architechture the PAGE_OFFSET is:
> 0xffff880000000000
> while many today's x86_64 CPUs have got 2^48 virtual address space which is smaller than PAGE_OFFSET.
> How is that. I thought that PAGE_OFFSET must have always been smaller than available virtual address space.
> 
> thanks for answer

Sorki, mialo byc po polsku (chociaz pewnie dla wiekszosci grupowiczow nie ma roznicy). Przetlumacze na wszelki wypadek:

Widze ze PAGE_OFFSET dla x86_64 w linuxie ma wartosc:
0xffff880000000000
Wiekszosc dzisiejszych processorow 64-bitowych x86 ma wielkosc virtualnej przestrzeni adresowej 2^48 co jest mniejsze niz PAGE_OFFSET.
Jak to jest ze to dziala. Jak na moje to nie moze dzialac, ale pewnie sie myle :-)
dzieki za odpowiedz

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