base/arch/i386/calibration/calibrate.h

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#define CALSRQ        0xcacca

#define CAL_8254      1
#define KLATENCY      2
#define KTHREADS      3
#define END_KLATENCY  4
#define FREQ_CAL      5
#define END_FREQ_CAL  6
#define BUS_CHECK     7
#define END_BUS_CHECK 8
#define GET_PARAMS    9

#define PARPORT       0x370

#define MAXARGS       4
#define STACKSIZE     5000
#define FIFOBUFSIZE   1000
#define INILOOPS      100

struct params_t { unsigned long 
    mp,
    setup_time_8254, 
    latency_8254,  
    freq_apic,
    latency_apic,
    setup_time_apic,
    calibrated_apic_freq,
    cpu_freq,
    calibrated_cpu_freq,
    clock_tick_rate,
    latch;
};

struct times_t { 
    unsigned long long cpu_time;
    unsigned long apic_time;
    int intrs;
};

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