[PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations

[Richard Henderson]

On 06/22/2017 09:48 AM, Logan Gunthorpe wrote:
> Alpha implements its own io operation and doesn't use the
> common library. Thus to make ioread64 and iowrite64 globally
> available we need to add implementations for alpha.
> 
> For this, we simply use calls that chain two 32-bit operations.
> (mostly because I don't really understand the alpha architecture.)

It's not difficult to provide this interface[*].  I believe the only reason I 
didn't do so from the beginning is that it wasn't used.



r~


* At least for systems other than Jensen, which cannot generate 64-bit I/O.  On 
the other hand, Jensen doesn't have PCI (EISA only), and so won't have any 
devices that care.