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Changes to the pit wrapper code that should help synchronization some.

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This commit is contained in:
Gregory Alexander 2002-01-31 17:18:38 +00:00
parent 26e6452142
commit 05983c7a48
1 changed files with 33 additions and 15 deletions
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48
bochs/iodev/pit_wrap.cc
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: pit_wrap.cc,v 1.11 2002-01-29 17:20:11 vruppert Exp $
// $Id: pit_wrap.cc,v 1.12 2002-01-31 17:18:38 yakovlev Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002 MandrakeSoft S.A.
@ -43,11 +43,11 @@ bx_pit_c bx_pit;
#endif
//How many timer ticks per usecond.
//1.193MHz Clock
//1.193181MHz Clock
//1193/1000 Ticks Per usecond.
#define TIME_MULT 1.193
#define TICKS_TO_USEC(a) ( ((a)*1000)/1193 )
#define USEC_TO_TICKS(a) ( ((a)*1193)/1000 )
#define TICKS_TO_USEC(a) ( ((a)*1000000)/1193181 )
#define USEC_TO_TICKS(a) ( ((a)*1193181)/1000000 )
#define MAX(a,b) ( ((a)>(b))?(a):(b) )
bx_pit_c::bx_pit_c( void )
@ -105,6 +105,9 @@ bx_pit_c::init( bx_devices_c *d )
BX_PIT_THIS s.last_next_event_time = BX_PIT_THIS s.timer.get_next_event_time();
BX_PIT_THIS s.last_usec=bx_pc_system.time_usec();
BX_PIT_THIS s.total_usec=0;
BX_PIT_THIS s.total_ticks=0;
BX_DEBUG(("pit: finished init"));
BX_DEBUG(("s.last_usec=%d",BX_PIT_THIS s.last_usec));
@ -130,10 +133,8 @@ bx_pit_c::handle_timer() {
BX_DEBUG(("pit: entering timer handler"));
if(time_passed32 && periodic(time_passed32)) {
// This is a hack to make the IRQ0 work
bx_pic.lower_irq(0);
bx_pic.raise_irq(0);
if(time_passed32) {
periodic(time_passed32);
}
BX_PIT_THIS s.last_usec=BX_PIT_THIS s.last_usec + time_passed;
if(time_passed ||
@ -244,10 +245,8 @@ bx_pit_c::write( Bit32u address, Bit32u dvalue,
BX_DEBUG(("pit: entering write handler"));
if(time_passed32 && periodic(time_passed32)) {
// This is a hack to make the IRQ0 work
bx_pic.lower_irq(0);
bx_pic.raise_irq(0);
if(time_passed32) {
periodic(time_passed32);
}
BX_PIT_THIS s.last_usec=BX_PIT_THIS s.last_usec + time_passed;
@ -293,6 +292,12 @@ bx_pit_c::write( Bit32u address, Bit32u dvalue,
(unsigned) address, (unsigned) value));
}
if ((BX_PIT_THIS s.timer.read_OUT(0))==1) {
bx_pic.raise_irq(0);
} else {
bx_pic.lower_irq(0);
}
if(time_passed ||
(BX_PIT_THIS s.last_next_event_time
!= BX_PIT_THIS s.timer.get_next_event_time())
@ -353,7 +358,16 @@ bx_pit_c::periodic( Bit32u usec_delta )
{
Boolean prev_timer0_out = BX_PIT_THIS s.timer.read_OUT(0);
Boolean want_interrupt = 0;
Bit32u ticks_delta=(Bit32u)(USEC_TO_TICKS((Bit64u)(usec_delta)));
Bit32u ticks_delta = 0;
BX_PIT_THIS s.total_usec += usec_delta;
ticks_delta=(Bit32u)((USEC_TO_TICKS((Bit64u)(BX_PIT_THIS s.total_usec)))-BX_PIT_THIS s.total_ticks);
BX_PIT_THIS s.total_ticks += ticks_delta;
while ((BX_PIT_THIS s.total_ticks >= 1193181) && (BX_PIT_THIS s.total_usec >= 1000000)) {
BX_PIT_THIS s.total_ticks -= 1193181;
BX_PIT_THIS s.total_usec -= 1000000;
}
while(ticks_delta>0) {
Bit32u maxchange=BX_PIT_THIS s.timer.get_next_event_time();
@ -362,8 +376,12 @@ bx_pit_c::periodic( Bit32u usec_delta )
timedelta=ticks_delta;
}
BX_PIT_THIS s.timer.clock_all(timedelta);
if ( (prev_timer0_out==0) && ((BX_PIT_THIS s.timer.read_OUT(0))==1) ) {
want_interrupt=1;
if ( (prev_timer0_out==0) ) {
if ((BX_PIT_THIS s.timer.read_OUT(0))==1)
bx_pic.raise_irq(0);
} else {
if ((BX_PIT_THIS s.timer.read_OUT(0))==0)
bx_pic.lower_irq(0);
}
prev_timer0_out=BX_PIT_THIS s.timer.read_OUT(0);
ticks_delta-=timedelta;