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:
Butch Wilmore and Suni Williams have been on the ISS since June 2024
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习题链接：LeetCode 503. 下一个更大元素 II
On the fourth loop iteration, the backing store of size 4 has only 3