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skrzyp |
//==========================================================================
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//
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// io/wallclock/emulate.cxx
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//
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// Wallclock emulation implementation
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//
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//==========================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): nickg
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// Contributors: nickg
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// Date: 1999-03-05
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// Purpose: Wallclock emulation
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include <pkgconf/wallclock.h> // Wallclock device config
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#include <pkgconf/kernel.h> // Kernel config
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#include <cyg/infra/cyg_type.h> // Common type definitions and support
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#include <cyg/kernel/ktypes.h>
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#include <cyg/io/wallclock.hxx> // The WallClock API
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#include <cyg/kernel/clock.hxx> // Access to kernel clock
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#include <cyg/kernel/clock.inl>
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// Remember the tick count at the time of initialization.
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static cyg_tick_count epoch_ticks;
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//-----------------------------------------------------------------------------
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// Called to initialize the hardware clock with a known valid
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// time. Which of course isn't required when doing emulation using the
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// kernel clock. But we set the private epoch base to "now".
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void
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Cyg_WallClock::init_hw_seconds( void )
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{
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// Remember the current clock tick count.
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epoch_ticks = Cyg_Clock::real_time_clock->current_value();
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}
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//-----------------------------------------------------------------------------
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// Returns the number of seconds elapsed since the init call.
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cyg_uint32
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Cyg_WallClock::get_hw_seconds( void )
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{
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Cyg_Clock::cyg_resolution res =
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Cyg_Clock::real_time_clock->get_resolution();
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cyg_tick_count secs = Cyg_Clock::real_time_clock->current_value()
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- epoch_ticks;
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secs = secs / ( ( res.divisor * 1000000000LL ) / res.dividend );
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return secs;
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}
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//-----------------------------------------------------------------------------
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// End of devs/wallclock/emulate.cxx
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