Logical Address->Linear Address->Physical Address

3 registers for starting pos: LDTR, GDTR( register for starting addr of DT) ---段描述符 每個段由一個8字節（64位）的段描述符來描述，他表示段的各項屬性。段描述符放在叫全局描述符表（Global Descriptor Table：GDT )或局部描述符表（Local Descriptor Table：LDT）中。GDT

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