1 //==========================================================================
3 // io/wallclock/emulate.cxx
5 // Wallclock emulation implementation
7 //==========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
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38 // -------------------------------------------
39 //####ECOSGPLCOPYRIGHTEND####
40 //==========================================================================
41 //#####DESCRIPTIONBEGIN####
44 // Contributors: nickg
46 // Purpose: Wallclock emulation
48 //####DESCRIPTIONEND####
50 //==========================================================================
52 #include <pkgconf/wallclock.h> // Wallclock device config
53 #include <pkgconf/kernel.h> // Kernel config
55 #include <cyg/infra/cyg_type.h> // Common type definitions and support
56 #include <cyg/kernel/ktypes.h>
58 #include <cyg/io/wallclock.hxx> // The WallClock API
60 #include <cyg/kernel/clock.hxx> // Access to kernel clock
61 #include <cyg/kernel/clock.inl>
64 // Remember the tick count at the time of initialization.
65 static cyg_tick_count epoch_ticks;
67 //-----------------------------------------------------------------------------
68 // Called to initialize the hardware clock with a known valid
69 // time. Which of course isn't required when doing emulation using the
70 // kernel clock. But we set the private epoch base to "now".
72 Cyg_WallClock::init_hw_seconds( void )
74 // Remember the current clock tick count.
75 epoch_ticks = Cyg_Clock::real_time_clock->current_value();
78 //-----------------------------------------------------------------------------
79 // Returns the number of seconds elapsed since the init call.
81 Cyg_WallClock::get_hw_seconds( void )
83 Cyg_Clock::cyg_resolution res =
84 Cyg_Clock::real_time_clock->get_resolution();
85 cyg_tick_count secs = Cyg_Clock::real_time_clock->current_value()
88 secs = secs / ( ( res.divisor * 1000000000LL ) / res.dividend );
93 //-----------------------------------------------------------------------------
94 // End of devs/wallclock/emulate.cxx