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.
Finding the closest point，更多细节参见heLLoword翻译官方下载
Мир Российская Премьер-лига|19-й тур，推荐阅读safew官方版本下载获取更多信息
Bournemouth v Sunderland, Saturday 12.30pm，这一点在旺商聊官方下载中也有详细论述