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Index > OS Construction > 64-Bit OS ???

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Geek



Joined: 01 Jun 2005
Posts: 26
Geek
What kind of security system dose a 64-bit processor have?

I mean, a 32-bit architecture uses protected mode to gaurd access to unauthorized resources but what dose the 64-bit architecture have?

Cool Cool Cool

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Post 21 Jun 2005, 20:53
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UCM



Joined: 25 Feb 2005
Posts: 285
Location: Canada
UCM
64-bit protected mode i think, not sure tho
Post 21 Jun 2005, 21:15
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Tommy



Joined: 17 Jun 2003
Posts: 489
Location: Norway
Tommy
"long mode"?
Post 21 Jun 2005, 21:25
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Chewy509



Joined: 19 Jun 2003
Posts: 297
Location: Bris-vegas, Australia
Chewy509
Geek wrote:
What kind of security system dose a 64-bit processor have?

I mean, a 32-bit architecture uses protected mode to gaurd access to unauthorized resources but what dose the 64-bit architecture have?

Cool Cool Cool


Which 64bit processor? SPARC, Alpha, PA-RISC, Itanium, MIPS, PPC970, Power5, AMD64?

For the AMD64, it uses paging exclusively within long mode (the native 64bit mode), and uses the NX bit to tell if a page is executable or not. (Segmentation is effectively disabled, except for IIRC the FS and GS registers).

PPC970, uses a combination of segmentation and paging. (The segmentation is nothing like the segmentation in x86).

The rest generally use paging mechanisms to provide discrete memory spaces.
Post 21 Jun 2005, 23:26
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