speedstep.c File Reference

#include <types.h>
#include <string.h>
#include <arch/cpu.h>
#include <cpu/x86/msr.h>
#include <console/console.h>
#include <cpu/intel/speedstep.h>

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Functions
static void	speedstep_get_limits (sst_params_t *const params)
	Gather speedstep limits for current processor. More...
void	speedstep_gen_pstates (sst_table_t *const table)
	Generate full p-states table from processor parameters. More...

Function Documentation

speedstep_gen_pstates()

void speedstep_gen_pstates

(

sst_table_t *const

table

)

Generate full p-states table from processor parameters.

This is generic code and should work at least for Merom and Penryn processors. It is used to generate ACPI tables and configure EMTTM.

Definition at line 101 of file speedstep.c.

References BIOS_INFO, sst_table_t::num_states, params, power, printk, SPEEDSTEP_DOUBLE_RATIO, speedstep_get_limits(), SPEEDSTEP_MAX_NORMAL_STATES, sst_table_t::states, vid, and sst_state_t::vid.

Referenced by configure_emttm_tables(), and generate_cpu_entries().

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speedstep_get_limits()

static void speedstep_get_limits ( sst_params_t *const  params )

static

Gather speedstep limits for current processor.

At least power limits are processor type specific. Penryn introduced half steps in bus ratios. Don't know about Atom processors.

Definition at line 16 of file speedstep.c.

References cpu_id, cpuid_eax(), msr_struct::hi, IA32_MISC_ENABLE, IA32_PERF_STATUS, IA32_PLATFORM_ID, msr_struct::lo, memset(), MSR_EXTENDED_CONFIG, MSR_FSB_CLOCK_VCC, MSR_THERM2_CTL, params, rdmsr(), SPEEDSTEP_MAX_POWER_MEROM, SPEEDSTEP_MAX_POWER_PENRYN, SPEEDSTEP_MAX_POWER_YONAH, SPEEDSTEP_MIN_POWER_MEROM, SPEEDSTEP_MIN_POWER_PENRYN, SPEEDSTEP_MIN_POWER_YONAH, SPEEDSTEP_RATIO_NONINT, SPEEDSTEP_RATIO_SHIFT, SPEEDSTEP_RATIO_VALUE_MASK, SPEEDSTEP_SLFM_POWER_MEROM, SPEEDSTEP_SLFM_POWER_PENRYN, SPEEDSTEP_STATE_FROM_MSR, and SPEEDSTEP_VID_MASK.

Referenced by speedstep_gen_pstates().

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