Author Topic: Native assembly languages on AMD and Intel processors?  (Read 6799 times)

Farabi

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Re: Native assembly languages on AMD and Intel processors?
« Reply #15 on: October 21, 2015, 02:13:24 PM »
"SysWow64"  :greensml: , well that is the default name for the 64-bit folder.

No, it's the 32-bit folder.

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On 64-bit machine there are 32 modes, 16-bit, 32-bit and 64-bit

Havent tried it personaly, but I think I saw on OS Dev article about that 3 modes.

Do I miss understood it?
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Long mode does not support hardware task switching or virtual 8086 tasks. In long mode the current CS determines if the code currently running is 64 bit code (true long mode) or 32 bit code (compatibility mode), or even 16-bit protected mode code (still in compatibility mode). Using paging has become mandatory, and segmentation has been stripped down for performance reasons.
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