设定 global variable: avail_start 可用而未用的 physcial mem (physfree). virtual_avail virtual_end kernel_pmap 并保留 virtual space 给 pmap 使用 (不 allocate physical addr), CMAP1/CADDR1, CMAP2/CADDR2 for zeroing & copying pages. ptmmap/ptvmmap for reading arbitrary physical pages via /dev/mem. msgbufmap/msgbufp to map the system message buffer. |
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