it is worth optimising.
He said: "Wear a leek, eat a leek. Wear a daffodil. Eat a Welsh cake. Share a cwtch (a cuddle). Dydd Gŵyl Dewi Hapus iawn, have a very happy St David's Day."
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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.。业内人士推荐搜狗输入法下载作为进阶阅读
Credits: This analysis of the 80386 draws on the microcode disassembly and silicon reverse engineering work of reenigne, gloriouscow, smartest blob, and Ken Shirriff.