On Thu, 27 Sep 2007, Peter Grehan wrote:
- Assert that we're not trying to compile ULE on an unsupported architecture. To date, I believe only i386 and amd64 have implemented the third cpu switch argument required.ARM has it: http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/arm/arm/swtch.S?r1=1.20#rev1.20
Oh excellent Peter. I hadn't seen that. Did you verify that it works? Does arm support SMP? It looks like it does not?
PPC doesn't, though I think you told me that it was only required when running MP. Is that still the case ?
For UP it doesn't need to wait for blocked lock to clear but it does need to set td_lock. On UP there are no special synchronization requirements so it can happen as the very first instruction in cpu_switch.
Jeff
later, Peter.
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