On Friday, February 06, 2015 06:20:00 PM John Baldwin wrote: > Author: jhb > Date: Fri Feb 6 18:19:59 2015 > New Revision: 278325 > URL: https://svnweb.freebsd.org/changeset/base/278325 > > Log: > Revert the IPI startup sequence to match what is described in the > Intel Multiprocessor Specification v1.4. The Intel SDM claims that > the INIT IPIs here are invalid, but other systems follow the MP > spec instead.
All of the breakage here is my fault. The original IPIs present in FreeBSD 3 and 4 followed the MP spec. However, the Intel SDM claims that some of the IPIs involved are invalid on modern hardware and doesn't use level trigger or a de-assert INIT in the reference code in the SDM. The SDM is what led me to change the initial INIT to edge trigger. One SDMism I did adopt here was to always set the interrupt asserted bit except in the special case of the INIT de-assert. -- John Baldwin _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
