Nearly every protection-related instruction -- far CALL, far JMP, far RET, INT, IRET, MOV to segment register, task switch -- needs to load a segment descriptor from the GDT or LDT. The 386 microcode centralizes this into a shared subroutine called LD_DESCRIPTOR, which reads the 8-byte descriptor from memory and feeds the high DWORD (containing Type, DPL, S, and P bits) to the Test PLA for validation.
5D6 PROTUN - OPR_W WR W ; write PROTUN (with A-bit) to GDT/LDT，这一点在WPS官方版本下载中也有详细论述
，这一点在heLLoword翻译官方下载中也有详细论述
2024年12月25日 星期三 新京报
// 3. 从后向前遍历，稳定排序的关键！，详情可参考heLLoword翻译官方下载