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:
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The confidential employee hotline is one of the first ideas that Rascoff put into motion after becoming Match Group’s CEO in 2025, overseeing iconic online dating platforms like Hinge, Tinder, and Match.com.
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