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Diffstat (limited to 'tools/ioemu/include/pc_system.h')
| -rw-r--r-- | tools/ioemu/include/pc_system.h | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/tools/ioemu/include/pc_system.h b/tools/ioemu/include/pc_system.h new file mode 100644 index 0000000000..c35c35bf52 --- /dev/null +++ b/tools/ioemu/include/pc_system.h @@ -0,0 +1,199 @@ +///////////////////////////////////////////////////////////////////////// +// $Id: pc_system.h,v 1.25 2003/03/02 23:59:08 cbothamy 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) BX_CPP_AttrRegparmN(2); + void outp(Bit16u addr, Bit32u value, unsigned io_len) BX_CPP_AttrRegparmN(3); + void set_enable_a20(Bit8u value) BX_CPP_AttrRegparmN(1); + bx_bool get_enable_a20(void); + void exit(void); + + }; |