Re: iomapping a big endian area

["Randy.Dunlap" <rddunlap@osdl.org>]

James Bottomley wrote:
> On Mon, 2005-04-04 at 17:50 +1000, Benjamin Herrenschmidt wrote:
> 
>>I disagree. The driver will never "know" ...
> 
> 
> ? the driver has to know.  Look at the 53c700 to see exactly how awful
> it is.  This beast has byte and word registers.  When used BE, all the
> byte registers alter their position (to both inb and readb).
> 
> 
>>I don't think it's sane. You know that your device is BE or LE and use
>>the appropriate interface. "native" doesn't make sense to me in this
>>context.
> 
> 
> Well ... it's like this. Native means "pass through without swapping"
> and has an easy implementation on both BE and LE platforms.  Logically
> io{read,write}{16,32}be would have to do byte swaps on LE platforms.
> Being lazy, I'm opposed to doing the work if there's no actual use for
> it, so can you provide an example of a BE bus (or device) used on a LE
> platform that would actually benefit from this abstraction?

I would probably spell "native" as "noswap".
"native" just doesn't convey enough specific meaning...

-- 
~Randy