Messages in this thread | | | From | Jakub Jelinek <> | Subject | Re: x86 memsize > 1Gb patches. | Date | Wed, 18 Mar 1998 06:58:47 +0100 (MET) |
| |
> > Bad idea, phys_to_virt(x) translates to (PAGE_OFFSET | x). You do not > > want call overhead on single instruction. (Which is probably exactly > > as long as call instruction). > > Do the calculation using inline assembler, collect the addresses of the > add instructions in a special ELF section. Patch the add instructions > on startup and free the section.
That's roughly what we do in btfixup on sparc32. The problem is modules: you'd either had to add some callback called when insmodding, or export the PAGE_OFFSET number somehow to userland and let insmod do that.
Cheers, Jakub ___________________________________________________________________ Jakub Jelinek | jj@sunsite.mff.cuni.cz | http://sunsite.mff.cuni.cz Administrator of SunSITE Czech Republic, MFF, Charles University ___________________________________________________________________ Ultralinux - first 64bit OS to take full power of the UltraSparc Linux version 2.1.89 on a sparc64 machine (498.80 BogoMips). ___________________________________________________________________
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu
| |