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> OS Construction > 64-Bit OS ??? |
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UCM 21 Jun 2005, 21:15
64-bit protected mode i think, not sure tho
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21 Jun 2005, 21:15 |
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Tommy 21 Jun 2005, 21:25
"long mode"?
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21 Jun 2005, 21:25 |
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Chewy509 21 Jun 2005, 23:26
Geek wrote: What kind of security system dose a 64-bit processor have? 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. |
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21 Jun 2005, 23:26 |
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