> > I'm using pci_mapreg_map() to map the chip's RAM, passing it
> > PCI_MAPREG_TYPE_MEM | PCI_MAPREG_MEM_TYPE_32BIT for the "expected"
> > argument. This gets me a tag and handle that I can use with the
> > bus_space_* macros/functions to access the memory. However, the driver
> > wants to be able to access the memory as a struct, and do stuff like
> > "scriptstruct->member = somevalue".
> 
> "so, fix it."  That is not portable code.  Device memory may not be
> mapped linearly, and indeed on many systems _is not_ mapped inearly.

Is it OK to access network protocol headers through structures in C ?
I am worried about compilers and systems with weird alignment requirements
- e.g. aligning u_int16_t to 4 bytes or not having u_int16_t at all
(fortunately, I haven't any yet).


-- 
Zdenek Salvet                                              salvet@ics.muni.cz 
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           If God had meant for us to be in the Army,
         we would have been born with green, baggy skin.