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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.，推荐阅读safew官方下载获取更多信息
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You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.，更多细节参见同城约会
And no matter what, the plan to use Russian assets remains problematic, since the ISS would have a “shallower reentry,” NASA says, and sprinkle surviving debris over a larger-than-desired area. Still, NASA would retain significant control over where any of these extant shards might plop down. They’ll probably land in the ocean, just as the space agency has always hoped. Sure, the station would have died before its time, but the thing was getting old. Most likely, it will be fine.