Hi Richard, >>> Answering my own question, N1 does not officially have FEAT_LSE2. >> >> It doesn't indeed. However most cores support atomic 128-bit load/store >> (part of LSE2), so we can still use the LSE2 ifunc for those cores. Since >> there >> isn't a feature bit for this in the CPU or HWCAP, I check the CPUID register. > > That would be a really nice bit to add to HWCAP, then, to consolidate this > knowledge in > one place. Certainly I would use it in QEMU as well.
Yes this was suggested by a colleague as well. I'll ask and see whether the kernel guys like the idea. It would take some time to get added, so we still need this for the time being. Cheers, Wilco
