By exploring these questions1, this article will shed light on the nuanced relationship between an operating system and the hardware it runs on. We’ll examine the constraints the CPU can impose on the kernel, and how the kernel can bypass these constraints.
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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:,推荐阅读WhatsApp Web 網頁版登入获取更多信息