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//==========================================================================

//

//      io/wallclock/emulate.cxx

//

//      Wallclock emulation implementation

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

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//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     nickg

// Contributors:  nickg

// Date:          1999-03-05

// Purpose:       Wallclock emulation

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/wallclock.h>          // Wallclock device config

#include <pkgconf/kernel.h>             // Kernel config

#include <cyg/infra/cyg_type.h>         // Common type definitions and support

#include <cyg/kernel/ktypes.h>

#include <cyg/io/wallclock.hxx>         // The WallClock API

#include <cyg/kernel/clock.hxx>         // Access to kernel clock

#include <cyg/kernel/clock.inl>

// Remember the tick count at the time of initialization.

static cyg_tick_count epoch_ticks;

//-----------------------------------------------------------------------------

// Called to initialize the hardware clock with a known valid

// time. Which of course isn't required when doing emulation using the

// kernel clock. But we set the private epoch base to "now".

void

Cyg_WallClock::init_hw_seconds( void )

{

    // Remember the current clock tick count.

    epoch_ticks = Cyg_Clock::real_time_clock->current_value();

}

//-----------------------------------------------------------------------------

// Returns the number of seconds elapsed since the init call.

cyg_uint32

Cyg_WallClock::get_hw_seconds( void )

{

    Cyg_Clock::cyg_resolution res =

        Cyg_Clock::real_time_clock->get_resolution();

    cyg_tick_count secs = Cyg_Clock::real_time_clock->current_value()

        - epoch_ticks;

    secs = ( secs * res.dividend ) / ( res.divisor * 1000000000LL ) ;

    return secs;

}

//-----------------------------------------------------------------------------

// End of devs/wallclock/emulate.cxx