Well, the address that was in fact 0xc005000. I've made a mistake. It seems strange that the correspondent pte_t is NOT_PRESENT, since that address belongs to the kernel code. I used something like: pgd_t dir = pgd_offset(current->mm,addr); pmd_t pmd = pmd_offset(dir,addr); pte_t pte = pte_alloc_offset(pmd,addr); Regards, Pedro. ----- Original Message ----- From: "Rik van Riel" <riel@conectiva.com.br> To: "Pedro Nunes da Costa" <pncosta@dei.uc.pt> Cc: "Linux Kernel Newbie" <kernelnewbies@nl.linux.org> Sent: Thursday, November 14, 2002 2:03 AM Subject: Re: pte Not Present? > On Wed, 13 Nov 2002, Pedro Nunes da Costa wrote: > > > I'm writing a kernel module. > > > > When I try to obtain the pte of an address like 0x0005000, I get informed that pte is not present. > > > > That is not possible. It's Kernel code!! > > Well, it is possible. It's even expected, since the kernel also > lives in virtual (though non-pageable) memory. > > The kernel's memory might start at physical address 0, but it is > mapped into the kernel's page tables from virtual address 0xc0000000. > > regards, > > Rik > -- > Bravely reimplemented by the knights who say "NIH". > http://www.surriel.com/ http://guru.conectiva.com/ > Current spamtrap: <a href=mailto:"october@surriel.com";>october@surriel.com</a> > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
