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x86: Add a few common Intel CPU functions

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Add functions to query CPU information, needed for ACPI.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-09-22 12:45:08 -06:00 • committed by Bin Meng
parent abc585b745
commit 6c0da2da7c
3 changed files with 125 additions and 0 deletions
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49
arch/x86/include/asm/cpu_common.h
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@ -128,4 +128,53 @@ void cpu_set_eist(bool eist_status);
*/
void cpu_set_p_state_to_turbo_ratio(void);
/**
* cpu_get_coord_type() - Get the type of coordination for P-State transition
*
* See ACPI spec v6.3 section 8.4.6.5 _PSD (P-State Dependency)
*
* @return HW_ALL (always)
*/
int cpu_get_coord_type(void);
/**
* cpu_get_min_ratio() - get minimum support frequency ratio for CPU
*
* @return minimum ratio
*/
int cpu_get_min_ratio(void);
/**
* cpu_get_max_ratio() - get nominal TDP ration or max non-turbo ratio
*
* If a nominal TDP ratio is available, it is returned. Otherwise this returns
* the maximum non-turbo frequency ratio for this processor
*
* @return max ratio
*/
int cpu_get_max_ratio(void);
/**
* cpu_get_bus_clock_khz() - Get the bus clock frequency in KHz
*
* This is the value the clock ratio is multiplied with
*
* @return bus-block frequency in KHz
*/
int cpu_get_bus_clock_khz(void);
/**
* cpu_get_power_max() - Get maximum CPU TDP
*
* @return maximum CPU TDP (Thermal-design power) in mW
*/
int cpu_get_power_max(void);
/**
* cpu_get_max_turbo_ratio() - Get maximum turbo ratio
*
* @return maximum ratio
*/
int cpu_get_max_turbo_ratio(void);
#endif