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.
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Some say the technology is devaluing their work, while others reckon it is not yet – and might never be – good enough to replace them entirely
"I'd rather take a hard, clear action now and build from a position we believe in than manage a slow reduction of people toward the same outcome," he wrote.。一键获取谷歌浏览器下载对此有专业解读