159 lines
5.1 KiB
C++
159 lines
5.1 KiB
C++
////////////////////////////////////////////////////////////////////////
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// $Id: virt_timer.h,v 1.11 2006-05-27 15:54:49 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2002 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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/////////////////////////////////////////////////////////////////////////
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#ifndef _BX_VIRT_TIMER_H
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#define _BX_VIRT_TIMER_H
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// should be adjusted if want to support more SMP processors
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#define BX_MAX_VIRTUAL_TIMERS (32)
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#define BX_NULL_VIRTUAL_TIMER_HANDLE 10000
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#define BX_MAX_VIRTUAL_TIME (0x7fffffff)
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class bx_virt_timer_c : public logfunctions
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{
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private:
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struct {
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bx_bool inUse; // Timer slot is in-use (currently registered).
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Bit64u period; // Timer periodocity in virtual useconds.
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Bit64u timeToFire; // Time to fire next (in virtual useconds).
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bx_bool active; // 0=inactive, 1=active.
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bx_bool continuous; // 0=one-shot timer, 1=continuous periodicity.
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bx_timer_handler_t funct; // A callback function for when the
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// timer fires.
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// This function MUST return.
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void *this_ptr; // The this-> pointer for C++ callbacks
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// has to be stored as well.
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char id[BxMaxTimerIDLen]; // String ID of timer.
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} timer[BX_MAX_VIRTUAL_TIMERS];
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unsigned numTimers; // Number of currently allocated timers.
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//Variables for the timer subsystem:
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Bit64u current_timers_time;
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Bit64u timers_next_event_time;
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Bit64u last_sequential_time;
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bx_bool in_timer_handler;
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//Variables for the time sync subsystem:
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Bit64u virtual_next_event_time;
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Bit64u current_virtual_time;
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//Real time variables:
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Bit64u last_real_time;
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Bit64u total_real_usec;
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Bit64u last_realtime_delta;
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//System time variables:
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Bit64u last_usec;
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Bit64u usec_per_second;
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Bit64u stored_delta;
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Bit64u last_system_usec;
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Bit64u em_last_realtime;
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//Virtual timer variables:
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Bit64u total_ticks;
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Bit64u last_realtime_ticks;
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Bit64u ticks_per_second;
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bx_bool init_done;
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int system_timer_id;
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//Whether or not to use virtual timers.
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bx_bool use_virtual_timers;
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bx_bool virtual_timers_realtime;
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// A special null timer is always inserted in the timer[0] slot. This
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// make sure that at least one timer is always active, and that the
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// duration is always less than a maximum 32-bit integer, so a 32-bit
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// counter can be used for the current countdown.
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static const Bit64u NullTimerInterval;
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static void nullTimer(void* this_ptr);
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//Step the given number of cycles, optionally calling any timer handlers.
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void periodic(Bit64u time_passed);
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//Called when next_event_time changes.
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void next_event_time_update(void);
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//Called to advance the virtual time.
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// calls periodic as needed.
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void advance_virtual_time(Bit64u time_passed);
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public:
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bx_virt_timer_c();
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virtual ~bx_virt_timer_c() {}
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//Get the current virtual time.
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// This may return the same value on subsequent calls.
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Bit64u time_usec(void);
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//Get the current virtual time.
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// This will return a monotonically increasing value.
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// MUST NOT be called from within a timer handler.
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Bit64u time_usec_sequential(void);
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//Register a timer handler to go off after a given interval.
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//Register a timer handler to go off with a periodic interval.
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int register_timer( void *this_ptr, bx_timer_handler_t handler,
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Bit32u useconds,
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bx_bool continuous, bx_bool active, const char *id);
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//unregister a previously registered timer.
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bx_bool unregisterTimer(unsigned timerID);
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void start_timers(void);
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//activate a deactivated but registered timer.
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void activate_timer( unsigned timer_index, Bit32u useconds,
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bx_bool continuous );
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//deactivate (but don't unregister) a currently registered timer.
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void deactivate_timer( unsigned timer_index );
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//Timer handler passed to pc_system
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static void pc_system_timer_handler(void* this_ptr);
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//The real timer handler.
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void timer_handler();
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//Initialization
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void init(void);
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#if BX_SUPPORT_SAVE_RESTORE
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void register_state(void);
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#endif
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};
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extern bx_virt_timer_c bx_virt_timer;
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#endif // _BX_VIRT_TIMER_H
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