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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:
Who owns the Moon? A new space race means it could be up for grabs
He also told Ball he may go back into the recording studio to work on "some things that are half-formed or were never finished".