///////////////////////////////////////////////////////////////////////// // $Id: pc_system.h,v 1.24 2003-02-14 04:22:16 yakovlev Exp $ ///////////////////////////////////////////////////////////////////////// // // Copyright (C) 2002 MandrakeSoft S.A. // // MandrakeSoft S.A. // 43, rue d'Aboukir // 75002 Paris - France // http://www.linux-mandrake.com/ // http://www.mandrakesoft.com/ // // This library is free software; you can redistribute it and/or // modify it under the terms of the GNU Lesser General Public // License as published by the Free Software Foundation; either // version 2 of the License, or (at your option) any later version. // // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public // License along with this library; if not, write to the Free Software // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA #define BX_MAX_TIMERS 64 #define BX_NULL_TIMER_HANDLE 10000 #if BX_SHOW_IPS extern unsigned long ips_count; #endif typedef void (*bx_timer_handler_t)(void *); BOCHSAPI extern class bx_pc_system_c bx_pc_system; #ifdef PROVIDE_M_IPS extern double m_ips; #endif class BOCHSAPI bx_pc_system_c : private logfunctions { private: // =============================== // Timer oriented private features // =============================== struct { bx_bool inUse; // Timer slot is in-use (currently registered). Bit64u period; // Timer periodocity in cpu ticks. Bit64u timeToFire; // Time to fire next (in absolute ticks). bx_bool active; // 0=inactive, 1=active. bx_bool continuous; // 0=one-shot timer, 1=continuous periodicity. bx_timer_handler_t funct; // A callback function for when the // timer fires. void *this_ptr; // The this-> pointer for C++ callbacks // has to be stored as well. #define BxMaxTimerIDLen 32 char id[BxMaxTimerIDLen]; // String ID of timer. } timer[BX_MAX_TIMERS]; unsigned numTimers; // Number of currently allocated timers. Bit32u currCountdown; // Current countdown ticks value (decrements to 0). Bit32u currCountdownPeriod; // Length of current countdown period. Bit64u ticksTotal; // Num ticks total since start of emulator execution. Bit64u lastTimeUsec; // Last sequentially read time in usec. Bit64u usecSinceLast; // Number of useconds claimed since then. // A special null timer is always inserted in the timer[0] slot. This // make sure that at least one timer is always active, and that the // duration is always less than a maximum 32-bit integer, so a 32-bit // counter can be used for the current countdown. static const Bit64u NullTimerInterval; static void nullTimer(void* this_ptr); #if !defined(PROVIDE_M_IPS) // This is the emulator speed, as measured in millions of // x86 instructions per second that it can emulate on some hypothetically // nomimal workload. double m_ips; // Millions of Instructions Per Second #endif // This handler is called when the function which decrements the clock // ticks finds that an event has occurred. void countdownEvent(void); public: // ============================== // Timer oriented public features // ============================== void init_ips(Bit32u ips); int register_timer( void *this_ptr, bx_timer_handler_t, Bit32u useconds, bx_bool continuous, bx_bool active, const char *id); unsigned unregisterTimer(int timerID); void start_timers(void); void activate_timer( unsigned timer_index, Bit32u useconds, bx_bool continuous ); void deactivate_timer( unsigned timer_index ); static BX_CPP_INLINE void tick1(void) { #if BX_SHOW_IPS { extern unsigned long ips_count; ips_count++; } #endif if (--bx_pc_system.currCountdown == 0) { bx_pc_system.countdownEvent(); } } static BX_CPP_INLINE void tickn(Bit64u n) { #if BX_SHOW_IPS { extern unsigned long ips_count; ips_count += n; } #endif while (n >= Bit64u(bx_pc_system.currCountdown)) { n -= Bit64u(bx_pc_system.currCountdown); bx_pc_system.currCountdown = 0; bx_pc_system.countdownEvent(); // bx_pc_system.currCountdown is adjusted to new value by countdownevent(). }; // 'n' is not (or no longer) >= the countdown size. We can just decrement // the remaining requested ticks and continue. bx_pc_system.currCountdown -= Bit32u(n); } int register_timer_ticks(void* this_ptr, bx_timer_handler_t, Bit64u ticks, bx_bool continuous, bx_bool active, const char *id); void activate_timer_ticks(unsigned index, Bit64u instructions, bx_bool continuous); Bit64u time_usec(); Bit64u time_usec_sequential(); static BX_CPP_INLINE Bit64u time_ticks() { return bx_pc_system.ticksTotal + Bit64u(bx_pc_system.currCountdownPeriod - bx_pc_system.currCountdown); } static BX_CPP_INLINE Bit64u getTicksTotal(void) { return bx_pc_system.ticksTotal; } static BX_CPP_INLINE Bit32u getNumCpuTicksLeftNextEvent(void) { return bx_pc_system.currCountdown; } #if BX_DEBUGGER static void timebp_handler(void* this_ptr); #endif // =========================== // Non-timer oriented features // =========================== bx_bool HRQ; // Hold Request //bx_bool INTR; // Interrupt // Address line 20 control: // 1 = enabled: extended memory is accessible // 0 = disabled: A20 address line is forced low to simulate // an 8088 address map bx_bool enable_a20; // start out masking physical memory addresses to: // 8086: 20 bits // 286: 24 bits // 386: 32 bits // when A20 line is disabled, mask physical memory addresses to: // 286: 20 bits // 386: 20 bits // Bit32u a20_mask; void set_HRQ(bx_bool val); // set the Hold ReQuest line void set_INTR(bx_bool value); // set the INTR line to value int IntEnabled( void ); int InterruptSignal( PCS_OP operation ); int ResetSignal( PCS_OP operation ); Bit8u IAC(void); bx_pc_system_c(void); Bit32u inp(Bit16u addr, unsigned io_len); void outp(Bit16u addr, Bit32u value, unsigned io_len); void set_enable_a20(Bit8u value); bx_bool get_enable_a20(void); void exit(void); };