我永远不会忘记第一次与乔布斯的谈话。当时苹果正在谷底挣扎，史蒂夫试图扭转局势。很多人怀疑公司能否存活。有人警告我，加入苹果的风险巨大。
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│ KVM Hypervisor (Host) │ ◄── HARDWARE BOUNDARY
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: