Messages in this thread |  | | Date | Thu, 26 Sep 1996 23:16:38 +1000 (EST) | From | Keith Owens <> | Subject | Virtual/physical/bus accesses (was pre 2.1, AHA1542 fixes) |
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On Thu, 26 Sep 1996, Linus Torvalds wrote: > [snip] > So when the CPU wants any bus master to write to physical memory 0, it > has to give the master address 0x80000000 as the memory address. > [snip]
Interesting (as in "May you live in interesting times" :). I can see one problem here, the need to distinguish between address 0 meaning "byte 0" and address 0 meaning "no data present". Does not affect x86 because both map to bus 0, but might be a problem for other systems. Could result in a situation where 0 != NULL.
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