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[/] [ao486/] [trunk/] [bochs486/] [pc_system.h] - Blame information for rev 3

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1 2 alfik
/////////////////////////////////////////////////////////////////////////
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// $Id: pc_system.h 11478 2012-10-03 15:49:45Z sshwarts $
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/////////////////////////////////////////////////////////////////////////
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//
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//  Copyright (C) 2002-2009  The Bochs Project
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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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
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//
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/////////////////////////////////////////////////////////////////////////
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#ifndef BX_PCSYS_H
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#define BX_PCSYS_H
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#define BX_MAX_TIMERS 64
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#define BX_NULL_TIMER_HANDLE 10000
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typedef void (*bx_timer_handler_t)(void *);
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BOCHSAPI extern class bx_pc_system_c bx_pc_system;
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#ifdef PROVIDE_M_IPS
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extern double m_ips;
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#endif
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class BOCHSAPI bx_pc_system_c : private logfunctions {
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private:
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  // ===============================
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  // Timer oriented private features
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  // ===============================
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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 cpu ticks.
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    Bit64u  timeToFire; // Time to fire next (in absolute ticks).
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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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    void *this_ptr;            // The this-> pointer for C++ callbacks
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                               //   has to be stored as well.
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#define BxMaxTimerIDLen 32
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    char id[BxMaxTimerIDLen]; // String ID of timer.
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  } timer[BX_MAX_TIMERS];
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  unsigned   numTimers;  // Number of currently allocated timers.
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  unsigned   triggeredTimer;  // ID of the actually triggered timer.
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  Bit32u     currCountdown; // Current countdown ticks value (decrements to 0).
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  Bit32u     currCountdownPeriod; // Length of current countdown period.
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  Bit64u     ticksTotal; // Num ticks total since start of emulator execution.
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  Bit64u     lastTimeUsec; // Last sequentially read time in usec.
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  Bit64u     usecSinceLast; // Number of useconds claimed since then.
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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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#if !defined(PROVIDE_M_IPS)
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  // This is the emulator speed, as measured in millions of
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  // x86 instructions per second that it can emulate on some hypothetically
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  // nomimal workload.
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  double     m_ips; // Millions of Instructions Per Second
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#endif
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  // This handler is called when the function which decrements the clock
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  // ticks finds that an event has occurred.
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  void   countdownEvent(void);
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public:
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  // ==============================
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  // Timer oriented public features
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  // ==============================
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  void   initialize(Bit32u ips);
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  int    register_timer(void *this_ptr, bx_timer_handler_t, Bit32u useconds,
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                         bx_bool continuous, bx_bool active, const char *id);
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  bx_bool unregisterTimer(unsigned timerID);
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  void   start_timers(void);
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  void   activate_timer(unsigned timer_index, Bit32u useconds, bx_bool continuous);
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  void   deactivate_timer(unsigned timer_index);
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  unsigned triggeredTimerID(void) {
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    return triggeredTimer;
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  }
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  static BX_CPP_INLINE void tick1(void) {
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    if (--bx_pc_system.currCountdown == 0) {
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      bx_pc_system.countdownEvent();
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    }
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  }
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  static BX_CPP_INLINE void tickn(Bit32u n) {
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    while (n >= bx_pc_system.currCountdown) {
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      n -= bx_pc_system.currCountdown;
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      bx_pc_system.currCountdown = 0;
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      bx_pc_system.countdownEvent();
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      // bx_pc_system.currCountdown is adjusted to new value by countdownevent().
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    }
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    // 'n' is not (or no longer) >= the countdown size.  We can just decrement
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    // the remaining requested ticks and continue.
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    bx_pc_system.currCountdown -= n;
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  }
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  int register_timer_ticks(void* this_ptr, bx_timer_handler_t, Bit64u ticks,
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                           bx_bool continuous, bx_bool active, const char *id);
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  void activate_timer_ticks(unsigned index, Bit64u instructions,
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                            bx_bool continuous);
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  Bit64u time_usec();
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  Bit64u time_usec_sequential();
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  static BX_CPP_INLINE Bit64u time_ticks() {
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    return bx_pc_system.ticksTotal +
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      Bit64u(bx_pc_system.currCountdownPeriod - bx_pc_system.currCountdown);
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  }
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  static BX_CPP_INLINE Bit32u  getNumCpuTicksLeftNextEvent(void) {
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    return bx_pc_system.currCountdown;
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  }
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#if BX_DEBUGGER
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  static void timebp_handler(void* this_ptr);
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#endif
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  static void benchmarkTimer(void* this_ptr);
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  // ===========================
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  // Non-timer oriented features
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  // ===========================
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  bx_bool HRQ;     // Hold Request
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  // Address line 20 control:
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  //   1 = enabled: extended memory is accessible
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  //   0 = disabled: A20 address line is forced low to simulate
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  //       an 8088 address map
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  bx_bool enable_a20;
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  // start out masking physical memory addresses to:
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  //   8086:      20 bits
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  //    286:      24 bits
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  //    386:      32 bits
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  // when A20 line is disabled, mask physical memory addresses to:
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  //    286:      20 bits
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  //    386:      20 bits
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  bx_phy_address a20_mask;
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  volatile bx_bool kill_bochs_request;
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  void set_HRQ(bx_bool val);  // set the Hold ReQuest line
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  void raise_INTR(void);
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  void clear_INTR(void);
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  // Cpu and System Reset
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  int Reset(unsigned type);
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  Bit8u  IAC(void);
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  bx_pc_system_c();
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  Bit32u  inp(Bit16u addr, unsigned io_len) BX_CPP_AttrRegparmN(2);
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  void    outp(Bit16u addr, Bit32u value, unsigned io_len) BX_CPP_AttrRegparmN(3);
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  void    set_enable_a20(bx_bool value);
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  bx_bool get_enable_a20(void);
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  void    MemoryMappingChanged(void); // flush TLB in all CPUs
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  void    invlpg(bx_address addr);    // flush TLB page in all CPUs
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  void    exit(void);
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  void    register_state(void);
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};
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#endif

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