> I've fixed several drivers that do that. It doesnt work because structure
> padding goes and bites the idiots who do this. Also a struct pointer isnt
I'm pretty sure it's a reasonably safe assumption gcc doesn't reorder members
of structs as long as they are naturally aligned - otherwise I assume structs
used for DMA would need to be fixed, too ?
> capable of representing the entire physical address of some boxes - it can
> hit the full ISA address space sure.
For PCI, what ioremap() returns is a pointer type (it is not necessarily a
valid pointer, of course), so all mapped I/O addresses are representable by
a structure pointer (unless we had a really broken ABI where certain void *
couldn't be cast to struct pointers).
I'm not sure how the physical address space matters for this.
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This archive was generated by hypermail 2b29 : Tue Feb 15 2000 - 21:00:21 EST