On Fri, Dec 06, 2002 at 06:24:38PM +0100, Thiemo Seufer wrote: > Maybe I wasn't clear about it, I meant kernels with 32 bit address > space but 64 bit register width, allowing for userland N32 ABI. > > E.g. the old DECstations with R4k CPU and limited memory would fit > in this scheme. :-) I'm considering kernels with just 2-level page tables as a step into that direction. With 16kB pages that permits for 64GB of virtual address space, with 4kB pages; with a bit of tweaking we should be able to maintain the ability to map 2GB in the userspace. Ralf
