杰瑞发布于2023-10-31
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INT. LECTURE HALL - DAY MARX is in his Operating Systems class. This is considered the hardest class at Harvard and MARK is one of the 50 students with their laptops open as the professor takes them through an impossibly difficult lesson, PROFESSOR: So let's look at a sample problem: Suppose we're given a computer with a 16- bit virtual address and a page size of 256 bytes. A GIRL scribbles something on a piece of paper. Then hands it to the student next to her and nods that it should be passed over to MARK. While that's happening-- PROFESSOR (CONT'D) The system uses one-level page tables, which start at address 0x0400. Maybe you want to have DMA. on your 16-bit system, who knows? The first few pages are reserved for hardware flags, etc.