5D6 PROTUN - OPR_W WR W ; write PROTUN (with A-bit) to GDT/LDT
一般纳税人实行登记制度，具体登记办法由国务院税务主管部门制定。
。safew官方版本下载对此有专业解读
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Bits [17:14]: Four control flags -- set the descriptor's Accessed bit, mark validation passed, request a limit check, or signal a stack operation.