83c9d266d0
requesting source can be registered as well. Otherwise, there is no way to know which source modules are requesting suspect frequencies which are too high.
197 lines
6.4 KiB
C++
197 lines
6.4 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: pc_system.h,v 1.15 2002-10-02 05:16:01 kevinlawton 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 16
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#define BX_NULL_TIMER_HANDLE 10000 /* set uninitialized timer handles to this */
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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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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 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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Bit64u period; // Timer periodocity in cpu ticks.
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Bit64u remaining; // Remaining cpu ticks until current period elapses.
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Boolean active; // 0=inactive, 1=active.
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Boolean continuous; // 0=one-shot timer, 1=continuous periodicity.
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Boolean triggered; // 0=timer was just triggered by recent number of
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// elapsed cpu ticks. It is possible for more
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// than one timer to fire on the same ticks
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// boundary, thus there is one flag for each
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// possible timer here.
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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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} timer[BX_MAX_TIMERS];
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unsigned num_timers; // Number of currently allocated timers.
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Bit64u num_cpu_ticks_in_period; // Num cpu ticks in current period.
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Bit64u num_cpu_ticks_left; // Num ticks remaining before current period
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// elapses. Always <= num_cpu_ticks_in_period.
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//
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// The following 4 appear to be a giant hack. I'm going to look into
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// cleaning this up. (KPL)
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//
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Bit64u counter;
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int counter_timer_index;
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static const Bit64u COUNTER_INTERVAL;
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static void counter_timer_handler(void* this_ptr);
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// When any kind of event occurs, including the registration of a
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// new timer, this convenience function is used to expire the number
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// of ticks which have occurred thus far in the current interval
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// for each of the active timers.
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void expire_ticks(void);
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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 increment the clock
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// ticks finds that an event has occurred.
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void timer_handler(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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Boolean continuous, Boolean active, const char *id);
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void start_timers(void);
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void activate_timer( unsigned timer_index, Bit32u useconds,
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Boolean 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.num_cpu_ticks_left == 0) {
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bx_pc_system.timer_handler();
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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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if (bx_pc_system.num_cpu_ticks_left > n) {
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bx_pc_system.num_cpu_ticks_left -= n;
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return;
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}
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while (n >= bx_pc_system.num_cpu_ticks_left) {
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n -= bx_pc_system.num_cpu_ticks_left;
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bx_pc_system.num_cpu_ticks_left = 0;
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bx_pc_system.timer_handler();
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}
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}
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int register_timer_ticks(void* this_ptr, bx_timer_handler_t, Bit64u ticks, Boolean continuous, Boolean active, const char *id);
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void activate_timer_ticks(unsigned index, Bit64u instructions, Boolean continuous);
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Bit64u time_usec();
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Bit64u time_ticks();
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static BX_CPP_INLINE Bit64u getNumCpuTicksLeftNextEvent(void) {
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return bx_pc_system.num_cpu_ticks_left;
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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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Boolean HRQ; // Hold Request
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//Boolean 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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Boolean 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(Boolean val); // set the Hold ReQuest line
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void set_INTR(Boolean 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);
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void outp(Bit16u addr, Bit32u value, unsigned io_len);
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void set_enable_a20(Bit8u value);
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Boolean get_enable_a20(void);
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void exit(void);
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};
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