769775ceb4
- Use the CPU count register for more accurate microtime (from sbmips) and delay (based on an evbmips delay function) functions. - Schedule the next hardclock interrupt more accurately (from an sgimips patch by Rafal Boni). Clock drift on one board is now ~7ppm instead of ~330ppm. - Purge old pmax-based mcclock code. - Correctly round off some clock-derived variable calculations. XXX: Some of this code should be migrated to sys/arch/mips.