on 13/09/2010 20:07 Andriy Gapon said the following: > I am also going to take a look how Linux and OpenSolaris name the C-states.
Well, Linux does what you suggested, it uses index of a C-state as its name. There is one difference from our current code - if a C-state is skipped for some reason, then its index is not re-used, but the entry is marked as non-valid. So, if we skip "C2" for some reason, then "C3" will become "C2". Not so on Linux. Also, they print a type/class of a C state using C1, C2, C3 and "--" for higher/unknown types. Additionally, it seems that we do not currently have any support for Functional Fixed Hardware (FFH) way of providing C states. In this case _CST returns GAS of a register used to enter a C state with address space ID set to ACPI_ADR_SPACE_FIXED_HARDWARE (0x7f/127). Such addresses should be handled in a special way: ftp://download.intel.com/technology/IAPC/acpi/downloads/30222305.pdf Currently we simply (and silently) ignore such _CST entries. I think that this should be useful (if not necessary) with mwait. -- Andriy Gapon _______________________________________________ freebsd-acpi@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-acpi To unsubscribe, send any mail to "freebsd-acpi-unsubscr...@freebsd.org"