Debugging this was interesting enough that I wrote a full separate blog about it, but I’ll summarize here.
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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.。业内人士推荐heLLoword翻译官方下载作为进阶阅读
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Last month at the CES technology trade show in Las Vegas, Huang unveiled a new tech platform for self-driving cars.