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get CPU speed use pstat APIs


 
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get CPU speed use pstat APIs

I get my CPU speed use pstat APIs
use this program serach google and just test it
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/pstat.h>
#define CPU_ID 0
#define HZ_PER_MHZ 1000000
int main()
{
struct pst_processor pst;
union pstun pu;

pu.pst_processor = &pst;
pstat( PSTAT_PROCESSOR, pu, (size_t)sizeof(pst), (size_t)1, CPU_ID);
printf( "%d MHz\n",(int)((double)pst.psp_iticksperclktick * sysconf( _SC_CLK_TCK ) / HZ_PER_MHZ) );

return 0;
}


the resutl shows 399MZ
but I use machinfo command shows 1.59Gz

what's wrong with that code or my machine

my OS is HP UX 11.31 Itanium base

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PMU(4)							   BSD Kernel Interfaces Manual 						    PMU(4)

NAME
pmu -- support for Power Management Units found in all Apple laptops and some desktop Power Macintosh computers SYNOPSIS
pmu* at obio? nadb* at pmu? battery* at pmu? smartbat* at pmu? DESCRIPTION
The pmu driver provides support for the Power Management Unit found in Apple laptops and some desktop Power Macintosh computers. Functions controlled by the PMU include the real time clock, ADB, power, batteries, on some laptops like the PowerBook 3400c and similar machines it also controls hotkeys and display brightness, on others it provides an iic(9) bus and on some it controls CPU speed. On many older machines it also provides access to some non-volatile memory and thermal sensors. Not all those features are present on all machines, for instance Power Macintosh G4 and later machines don't have ADB, many more recent laptops have display brightness and backlight control built into the graphics controller instead of the PMU, only a few older PowerBooks use the PMU for CPU speed control and newer machines use a different way to access non-volatile memory. However, all known PMUs so far provide a real time clock and power control. Notes by model Real time clock and power control are present and supported on all machines that can run NetBSD/macppc, ADB is supported when present. PowerBook 2400, 3400c, and 3500 Battery status and thermal sensors found on the mainboard and in the battery pack are supported by the battery(4) driver, val- ues can be read via envsys(4). Hotkeys for brightness control are supported, CPU speed control and parameter RAM are present but unsupported. Power Macintosh G4 ADB is not present, iic(9) is present but unsupported. SEE ALSO
battery(4), cuda(4), nadb(4), nvram(4), obio(4), iic(9) BUGS
Some features are currently unsupported, like the iic(9) bus, access to parameter RAM and CPU speed control. BSD
May 14, 2007 BSD

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