On 03/07/2016 01:33 PM, Khalid Aziz wrote:

That is a possibility but limited in scope. An address range covered 
by a single TTE can have large number of tags. Version tags are set on 
cacheline. In extreme case, one could set a tag for each set of 
64-bytes in a page. Also tags are set completely in userspace and no 
transition occurs to kernel space, so kernel has no idea of what tags 
have been set.

   ...

I have not found a way to query the MMU on tags.

To query the tag for a cache line, you just read it back with ldxa and 
ASI_MCD_PRIMARY (ie, asi 0x90), basically the same way you stored the 
tag in the first place.

Rob



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