On Tue, Oct 02, 2001 at 04:40:28PM +0200, Martin Maletinsky wrote: > 1) They may be within the start region of kernel virtual addresses (the addresses between PAGE_OFFSET and PAGE_OFFSET + size of physical memory). This region provides a 1:1 > mapping between physikal and (kernel) virtual addresses, phys_to_virt() and virt_to_phys() provide conversion between (kernel) virtual addresses from this region and > physikal addresses. Note that virt_to_phys/phys_to_virt are a 2.2-legacy interface. As Linux 2.4 has a mm that is fundamentally page-based due to the highmem support you did not claim to understand above, virt_to_page/page_address are the preffered interface. For a page that actually is highmem use kmap(page) instead and unmap it with kunmap(page) again. Both give you a kernel-virtual and not a physical address. For lowmem pages __pa(addr) gives the real physical address. Christoph -- Whip me. Beat me. Make me maintain AIX. - Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/
