Messages in this thread | | | Subject | Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) | From | Khalid Aziz <> | Date | Mon, 7 Mar 2016 16:27:34 -0700 |
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On 03/07/2016 04:12 PM, Rob Gardner wrote: > 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. >
Thanks, Rob. I just saw it while reading through the manual.
-- Khalid
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