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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/processor.h
parentb4bd8c66435a8cdf8c90334fb3b517a23ff2ab95 (diff)
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/processor.h')
-rw-r--r--include/acpi/processor.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 9dd5b75961f8..7798d2a9f793 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -29,6 +29,9 @@
#define DOMAIN_COORD_TYPE_SW_ANY 0xfd
#define DOMAIN_COORD_TYPE_HW_ALL 0xfe
+#define ACPI_CSTATE_SYSTEMIO (0)
+#define ACPI_CSTATE_FFH (1)
+
/* Power Management */
struct acpi_processor_cx;
@@ -58,6 +61,8 @@ struct acpi_processor_cx {
u8 valid;
u8 type;
u32 address;
+ u8 space_id;
+ u8 index;
u32 latency;
u32 latency_ticks;
u32 power;
@@ -206,6 +211,9 @@ void arch_acpi_processor_init_pdc(struct acpi_processor *pr);
#ifdef ARCH_HAS_POWER_INIT
void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
unsigned int cpu);
+int acpi_processor_ffh_cstate_probe(unsigned int cpu,
+ struct acpi_processor_cx *cx, struct acpi_power_register *reg);
+void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx *cstate);
#else
static inline void acpi_processor_power_init_bm_check(struct
acpi_processor_flags
@@ -214,6 +222,16 @@ static inline void acpi_processor_power_init_bm_check(struct
flags->bm_check = 1;
return;
}
+static inline int acpi_processor_ffh_cstate_probe(unsigned int cpu,
+ struct acpi_processor_cx *cx, struct acpi_power_register *reg)
+{
+ return -1;
+}
+static inline void acpi_processor_ffh_cstate_enter(
+ struct acpi_processor_cx *cstate)
+{
+ return;
+}
#endif
/* in processor_perflib.c */