On 6/22/2017 2:36 PM, Alan Cox wrote:
I think that makes sense for the platforms with that problem. I'm not sure there are many that can't do it for mmio at least. 486SX can't do it and I guess some ARM32 but I think almost everyone else can including most 32bit x86. What's more of a problem is a lot of platforms can do 64bit MMIO via ioread/write64 but not 64bit port I/O, and it's not clear how you represent that via an ioread/write API that abstracts it away.
In Patch 2, we call bad_io_access for anyone trying to do 64bit accesses on port I/O.
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