X86_64 long mode(64bit) does not need segmente selector. Why is segmentation necessary in 32bit but useless in 64bit?
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X86_64 long mode(64bit) does not need segmente selector. Why is segmentation necessary in 32bit
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X86_64 long mode(64bit) does not need segmente selector. Why is segmentation necessary in 32bit but useless in 64bit?
Thanks,
CPU in X86_64 long mode uses PAE (Physical Address Extension) technology to control memory.
So segment selector is not necessary.
I recommend you read this pdf manual
AMD64 Architecture Programmer’s Manual Volume 2: System Programming.Google
amd64 volume 2, the first result is the pdf manual.See Chapter 5.3
Long-Mode Page Translation, and you will understand.