On Mon, Jul 21, 2008 at 10:44 AM, ZelluX <zellux@xxxxxxxxx> wrote: > Hi, all > > I have two problems about paging in Linux > > The first is, if we have physical memory of size 256M and allocate 16M to > the kernel, are the page directory and page tables of the kernel all stored > on the 16M kernel memory? > YES, > And another problem is, after we start virtual memory mechanism by changing > cr0, how to access physical memory in the kernel? For example, i have a > pointer pte_ptr with address 0x14000, by definition, the structure at the virtual address 0x14000 is a PTE right? then u just manipulate as per normal --- AND/OR operation to set the bit. the contents which the PTE structure contained will implement the virtual to physical mapping mechanism. which points to a page table entry, > and i want to clear the dirty bit in the entry, can i just dereference > pte_ptr and change its value? > > Many thanks and sorry for my poor English. > Correct me if wrong :-). -- Regards, Peter Teoh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
