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segment descriptor : ウィキペディア英語版
segment descriptor
In memory addressing for Intel x86 computer architectures, segment descriptors are a part of the segmentation unit, used for translating a logical address to a linear address. Segment descriptors describe the memory segment referred to in the logical address.〔Bovet, D.P., & Cesati, M. (2000). ''Understanding the Linux Kernel (First Edition)''. O'Reilly & Associates, Inc.〕
The segment descriptor (8 bytes long in 80286) contains the following fields:
# A segment base address
# The segment limit which specifies the segment size
# Access rights byte containing the protection mechanism information
# Control bits
==x86-64==

In X86-64, the code segment descriptor has the following form:
Where the fields stand for:
; Base Address : 32 bit starting memory address of the segment
; Segment Limit : 20 bit length of the segment. How exactly this should be interpreted depends on other bits of the segment descriptor.
; DPL : descriptor-privilege level

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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