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authorVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>2006-09-25 16:28:13 -0700
committerLen Brown <len.brown@intel.com>2006-10-14 00:35:39 -0400
commit991528d7348667924176f3e29addea0675298944 (patch)
treeed8552bd4c696700a95ae37b26c4197923207ae7 /include/acpi/pdc_intel.h
parentb4bd8c66435a8cdf8c90334fb3b517a23ff2ab95 (diff)
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ACPI: Processor native C-states using MWAIT
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>
Diffstat (limited to 'include/acpi/pdc_intel.h')
-rw-r--r--include/acpi/pdc_intel.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/include/acpi/pdc_intel.h b/include/acpi/pdc_intel.h
index c5472be6f3a..e72bfdd887f 100644
--- a/include/acpi/pdc_intel.h
+++ b/include/acpi/pdc_intel.h
@@ -13,6 +13,7 @@
#define ACPI_PDC_SMP_C_SWCOORD (0x0040)
#define ACPI_PDC_SMP_T_SWCOORD (0x0080)
#define ACPI_PDC_C_C1_FFH (0x0100)
+#define ACPI_PDC_C_C2C3_FFH (0x0200)
#define ACPI_PDC_EST_CAPABILITY_SMP (ACPI_PDC_SMP_C1PT | \
ACPI_PDC_C_C1_HALT | \
@@ -23,8 +24,10 @@
ACPI_PDC_SMP_P_SWCOORD | \
ACPI_PDC_P_FFH)
-#define ACPI_PDC_C_CAPABILITY_SMP (ACPI_PDC_SMP_C2C3 | \
- ACPI_PDC_SMP_C1PT | \
- ACPI_PDC_C_C1_HALT)
+#define ACPI_PDC_C_CAPABILITY_SMP (ACPI_PDC_SMP_C2C3 | \
+ ACPI_PDC_SMP_C1PT | \
+ ACPI_PDC_C_C1_HALT | \
+ ACPI_PDC_C_C1_FFH | \
+ ACPI_PDC_C_C2C3_FFH)
#endif /* __PDC_INTEL_H__ */