Hi, I am trying to understand the page table page allocation for a process in FBSD6.1. I see that the page table pages are allocated by vm_page_alloc(). I believe the virtual address for this allocated page can be derived by PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m)), however when I compare this address with the virtual address accessed in pmap_remove_pages() they are not the same.
The virtual address of a *PTE in pmap_remove_pages() is something like *0xffff800000643200 * However, the virtual address of the page allocated by vm_page_alloc() is * 0xffffff033c6a0000 *I would also like to understand the importance of loc_PTmap, I believe the pmap_remove_pages() is derving the page table page addresses from loc_PTmap? (kgdb) p loc_PTmap Cannot access memory at address 0xffff800000000000 How do we relate the loc_PTmap to the page table pages allocated by vm_page_alloc() in _pmap_allocpte(). Thanks, Vasanth _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"