The 09/30/2021 19:11, Mark Brown wrote: > --- /dev/null > +++ b/Documentation/arm64/sme.rst > @@ -0,0 +1,427 @@ > +=================================================== > +Scalable Matrix Extension support for AArch64 Linux > +=================================================== > + > +This document outlines briefly the interface provided to userspace by Linux in > +order to support use of the ARM Scalable Matrix Extension (SME). > + > +This is an outline of the most important features and issues only and not > +intended to be exhaustive. It should be read in conjunction with the SVE > +documentation in sve.rst which provides details on the Streaming SVE mode > +included in SME. > + > +This document does not aim to describe the SME architecture or programmer's > +model. To aid understanding, a minimal description of relevant programmer's > +model features for SME is included in Appendix A. > + > + > +1. General > +----------- > + > +* PSTATE.SM and PSTATE.ZA, the streaming mode vector length and the ZA > + register state are tracked per thread. can you add a note that there is a new TPIDR2_EL0 per thread and on thread creation it's 0 (and i guess unchanged on fork). at least this abi makes most sense to me.
