For segments, the job is split between hardware and microcode. When LD_DESCRIPTOR fires its protection test at 5CD, the Test PLA OR's the A-bit (bit 8 of the descriptor high DWORD) into a temporary register called PROTUN. Then the microcode at PROT_TESTS_PASSED takes over and writes the modified value back to the GDT or LDT in memory:
From the moment I completed Google TV setup and started watching the TCL X11L I was amazed. I could immediately tell it's the brightest TV I've had in my home, but it was the color vibrancy that I found most impressive. The colors we're all most familiar with - skin tones, the sky, green grass and trees - all look as close to realistic as I've seen on a TV. And with the color vibrancy it looks staggeringly good.
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│ Host Kernel (Ring 0) │ ◄── REDUCED ATTACK SURFACE
Фото: Евгений Одиноков / РИА Новости