Hello, I am re-forwarding this to kernelnewbies only as previous forward failed (I can't understand whats happening now-a-days with my account, it mostly fails in first attempt :( ) On 11/9/05, Mulyadi Santosa <a_mulyadi@xxxxxxxxxx> wrote: > > > can somebody tell me, which function translates the real physical > > memory address to the linear logical address. > > I think what you are looking for is phys_to_virt, which defined in > include/asm-i386/io.h for x86 32 bit platform. > > remember that the linear address below PAGE_OFFSET actually refer to > different set of physical memory range because they are specific for > each distinct process (for CLONE_VM-ed task, they are same), so you > better you use it only an address that is predicted to be translated at > above PAGE_OFFSET. Fawaad, CMIIW.... > You are right Mulyadi, me adding some more detail ... Actually the virutal/linear address below PAGE_OFFSET is for user space and they are managed by the VMM and their corresponding physical address (I think, as till now I havn't got into the details of user space memory mananagement) won't remain same after each page-fault for bringing the content back to main memory from the swap memory. But for the linear/virtual address above PAGE_OFFSET are for kernel space and till the ZONE_NORMAL (0MB to 896MB) there is a direct mapping of PAGE_OFFSET to 0MB physical address and so on till (PAGE_OFFSET + 896MB) to 896MB of physical memory and above 896MB of physical memory there isn't any direct relation of virtual/linear and physical address (the relation/mapping here is exactly depends on the page-table) > NB: Sorry, I am replying for non subscribed account of kernelnewbies. > Please forward this e-mail to the list along with your conclusion > whether this is indeed satisfy your need or not... > I am forwarding it to kernelnewbies, no problem. But still not sure whether __pkirsch__ is got the answer what he really wants or not, because pkirsch question is not so clear ! -- Fawad Lateef -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
