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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