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.
第一节 扰乱公共秩序的行为和处罚，这一点在搜狗输入法下载中也有详细论述
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"It is the only piece of science I've ever done that's really emotionally got me," he says.