Messages in this thread Patch in this message | | | Date | Thu, 12 Nov 1998 16:50:12 +0100 | From | Kurt Garloff <> | Subject | Re: virt_to_bus and >1G of memory (was MAX_DMA_ADDRESS ...) |
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On Thu, Nov 12, 1998 at 03:59:38PM +0100, Kurt Garloff wrote: > Reading this, I wonder, why my kernel with PAGE_OFFSET 0x70000000 does work. > Somebody able to explain this?
And it crashes with an ,,Unable to handle kernel paging request at e4414007`` in the ncr53c8xx (3.0i) driver, if I apply the following patch. So is the idea about what it should look like wrong, or is it the ncr53c8xx driver?
--- linux/include/asm-i386/io.h~ Thu Nov 12 10:52:46 1998 +++ linux/include/asm-i386/io.h Thu Nov 12 15:55:55 1998 @@ -101,8 +101,8 @@ #include <linux/vmalloc.h> #include <asm/page.h> -#define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x))) -#define __io_phys(x) ((unsigned long)(x) & ~PAGE_OFFSET) +#define __io_virt(x) ((void *)(PAGE_OFFSET + (unsigned long)(x))) +#define __io_phys(x) ((unsigned long)(x) - PAGE_OFFSET) /* * Change virtual addresses to physical addresses and vv. * These are pretty trivial -- Kurt Garloff <K.Garloff@ping.de> (Dortmund, FRG) PGP key on http://student.physik.uni-dortmund.de/homepages/garloff Unix IS user friendly - it's just selective about who its friends are!
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