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Intel processors starting with the Core Duo support support processor native C-state using the MWAIT instruction. Refer: Intel Architecture Software Developer's Manual http://www.intel.com/design/Pentium4/manuals/253668.htm Platform firmware exports the support for Native C-state to OS using ACPI _PDC and _CST methods. Refer: Intel Processor Vendor-Specific ACPI: Interface Specification http://www.intel.com/technology/iapc/acpi/downloads/302223.htm With Processor Native C-state, we use 'MWAIT' instruction on the processor to enter different C-states (C1, C2, C3). We won't use the special IO ports to enter C-state and no SMM mode etc required to enter C-state. Overall this will mean better C-state support. One major advantage of using MWAIT for all C-states is, with this and "treat interrupt as break event" feature of MWAIT, we can now get accurate timing for the time spent in C1, C2, .. states. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com> |
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| .. | ||
| platform | ||
| acconfig.h | ||
| acdebug.h | ||
| acdisasm.h | ||
| acdispat.h | ||
| acevents.h | ||
| acexcep.h | ||
| acglobal.h | ||
| achware.h | ||
| acinterp.h | ||
| aclocal.h | ||
| acmacros.h | ||
| acnames.h | ||
| acnamesp.h | ||
| acobject.h | ||
| acopcode.h | ||
| acoutput.h | ||
| acparser.h | ||
| acpi.h | ||
| acpi_bus.h | ||
| acpi_drivers.h | ||
| acpi_numa.h | ||
| acpiosxf.h | ||
| acpixf.h | ||
| acresrc.h | ||
| acstruct.h | ||
| actables.h | ||
| actbl.h | ||
| actbl1.h | ||
| actbl2.h | ||
| actbl71.h | ||
| actypes.h | ||
| acutils.h | ||
| amlcode.h | ||
| amlresrc.h | ||
| container.h | ||
| pdc_intel.h | ||
| processor.h | ||