Linux cli command __ppc_get_timebase_freq

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NAME 🖥️ __ppc_get_timebase_freq 🖥️

get the current value of the Time Base Register on Power architecture and its frequency.

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

#include <sys/platform/ppc.h>
uint64_t __ppc_get_timebase(void);
uint64_t __ppc_get_timebase_freq(void);

DESCRIPTION

__ppc_get_timebase() reads the current value of the Time Base Register and returns its value, while __ppc_get_timebase_freq() returns the frequency in which the Time Base Register is updated.

The Time Base Register is a 64-bit register provided by Power Architecture processors. It stores a monotonically incremented value that is updated at a system-dependent frequency that may be different from the processor frequency.

RETURN VALUE

__ppc_get_timebase() returns a 64-bit unsigned integer that represents the current value of the Time Base Register.

__ppc_get_timebase_freq() returns a 64-bit unsigned integer that represents the frequency at which the Time Base Register is updated.

STANDARDS

GNU.

HISTORY

__ppc_get_timebase()
glibc 2.16.

__ppc_get_timebase_freq()
glibc 2.17.

EXAMPLES

The following program will calculate the time, in microseconds, spent between two calls to __ppc_get_timebase().

Program source

#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/platform/ppc.h>
/* Maximum value of the Time Base Register: 2^60 - 1.
   Source: POWER ISA.  */
#define MAX_TB 0xFFFFFFFFFFFFFFF
int
main(void)
{
    uint64_t tb1, tb2, diff;
    uint64_t freq;
    freq = __ppc_get_timebase_freq();
    printf("Time Base frequency = %"PRIu64" Hz

“, freq); tb1 = __ppc_get_timebase(); // Do some stuff… tb2 = __ppc_get_timebase(); if (tb2 > tb1) { diff = tb2 - tb1; } else { /* Treat Time Base Register overflow. */ diff = (MAX_TB - tb2) + tb1; } printf(“Elapsed time = %1.2f usecs “, (double) diff * 1000000 / freq); exit(EXIT_SUCCESS); }

SEE ALSO

time(2), usleep(3)

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