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V86 mode is entered through IRETD when the VM bit is set in the stacked EFLAGS. The microcode detects this with a conditional jump:
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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.。关于这个话题，服务器推荐提供了深入分析
Москвичей предупредили о резком похолодании09:45，这一点在51吃瓜中也有详细论述
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