Test constant: A 6-bit identifier from the microcode that tells the PLA what kind of check to perform.
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.，详情可参考safew官方版本下载
，更多细节参见搜狗输入法下载
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Владимир Зеленский. Фото: PRESIDENT OF UKRAINE / Keystone Press Agency / Global Look Press，详情可参考safew官方版本下载
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