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On 64 bit x86, all of physical memory is mapped via the linear mapping region of the kernel’s virtual address space. kmap() is trivial in this case — it just needs to add the start address of the linear mapping to the frame’s physical address to compute the virtual address that frame is mapped at.
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3. finding older notes is complex and rarely happened
Offline Ventures的联合创始人Dave Morin感叹道：这是自2000年代末以来，我第一次对技术感到如此兴奋。这是项目的寒武纪大爆发。