mirror of https://github.com/bochs-emu/Bochs
200 lines
6.6 KiB
C++
200 lines
6.6 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: pc_system.h,v 1.25 2003-03-02 23:59:08 cbothamy 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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#define BX_MAX_TIMERS 64
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#define BX_NULL_TIMER_HANDLE 10000
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#if BX_SHOW_IPS
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extern unsigned long ips_count;
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#endif
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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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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 init_ips(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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unsigned unregisterTimer(int timerID);
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void start_timers(void);
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void activate_timer( unsigned timer_index, Bit32u useconds,
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bx_bool continuous );
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void deactivate_timer( unsigned timer_index );
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static BX_CPP_INLINE void tick1(void) {
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#if BX_SHOW_IPS
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{
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extern unsigned long ips_count;
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ips_count++;
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}
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#endif
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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(Bit64u n) {
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#if BX_SHOW_IPS
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{
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extern unsigned long ips_count;
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ips_count += n;
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}
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#endif
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while (n >= Bit64u(bx_pc_system.currCountdown)) {
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n -= Bit64u(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 -= Bit32u(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 Bit64u getTicksTotal(void) {
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return bx_pc_system.ticksTotal;
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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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// ===========================
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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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//bx_bool INTR; // Interrupt
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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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//
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Bit32u a20_mask;
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void set_HRQ(bx_bool val); // set the Hold ReQuest line
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void set_INTR(bx_bool value); // set the INTR line to value
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int IntEnabled( void );
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int InterruptSignal( PCS_OP operation );
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int ResetSignal( PCS_OP operation );
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Bit8u IAC(void);
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bx_pc_system_c(void);
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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(Bit8u value) BX_CPP_AttrRegparmN(1);
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bx_bool get_enable_a20(void);
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void exit(void);
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};
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