From: Hall, Philip <>

> > The first two 4-byte words shown contain the number of clock
> > ticks when this process last run.
> What are those values actually representing ? and how does it differ from
> the value returned by mattod

The decrementer register interrupt response (at 8000000000 000900)
reads a cycle counter register which simply counts machine cycles
since the machine was powered on. The cycle count is used by the
lowest layer of SLIC in calculations that has to do with elapsed time.

Various cycle counts are stored in the TDE (Task Dispatching Element).

As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2022 by and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.