443 lines
13 KiB
C++
443 lines
13 KiB
C++
///////////////////////////////////////////////////////////////////////
|
|
// $Id: pit_wrap.cc,v 1.56 2004-06-19 19:16:02 sshwarts 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
|
|
|
|
|
|
#include "iodev.h"
|
|
|
|
#if BX_USE_NEW_PIT
|
|
|
|
#include "pit_wrap.h"
|
|
|
|
//Important constant #defines:
|
|
#define USEC_PER_SECOND (1000000)
|
|
//1.193181MHz Clock
|
|
#define TICKS_PER_SECOND (1193181)
|
|
|
|
|
|
// define a macro to convert floating point numbers into 64-bit integers.
|
|
// In MSVC++ you can convert a 64-bit float into a 64-bit signed integer,
|
|
// but it will not convert a 64-bit float into a 64-bit unsigned integer.
|
|
// This macro works around that.
|
|
#define F2I(x) ((Bit64u)(Bit64s) (x))
|
|
#define I2F(x) ((double)(Bit64s) (x))
|
|
|
|
//DEBUG configuration:
|
|
|
|
//Set up Logging.
|
|
#define LOG_THIS bx_pit.
|
|
|
|
//A single instance.
|
|
bx_pit_c bx_pit;
|
|
#if BX_USE_PIT_SMF
|
|
#define this (&bx_pit)
|
|
#endif
|
|
|
|
//Workaround for environments where OUT is defined.
|
|
#ifdef OUT
|
|
# undef OUT
|
|
#endif
|
|
|
|
|
|
//Generic MAX and MIN Functions
|
|
#define BX_MAX(a,b) ( ((a)>(b))?(a):(b) )
|
|
#define BX_MIN(a,b) ( ((a)>(b))?(b):(a) )
|
|
|
|
|
|
//USEC_ALPHA is multiplier for the past.
|
|
//USEC_ALPHA_B is 1-USEC_ALPHA, or multiplier for the present.
|
|
#define USEC_ALPHA ((double)(.8))
|
|
#define USEC_ALPHA_B ((double)(((double)1)-USEC_ALPHA))
|
|
#define USEC_ALPHA2 ((double)(.5))
|
|
#define USEC_ALPHA2_B ((double)(((double)1)-USEC_ALPHA2))
|
|
#define ALPHA_LOWER(old,new) ((Bit64u)((old<new)?((USEC_ALPHA*(I2F(old)))+(USEC_ALPHA_B*(I2F(new)))):((USEC_ALPHA2*(I2F(old)))+(USEC_ALPHA2_B*(I2F(new))))))
|
|
|
|
|
|
//PIT tick to usec conversion functions:
|
|
//Direct conversions:
|
|
#define TICKS_TO_USEC(a) ( ((a)*USEC_PER_SECOND)/TICKS_PER_SECOND )
|
|
#define USEC_TO_TICKS(a) ( ((a)*TICKS_PER_SECOND)/USEC_PER_SECOND )
|
|
|
|
|
|
bx_pit_c::bx_pit_c( void )
|
|
{
|
|
put("PIT");
|
|
settype(PITLOG);
|
|
s.speaker_data_on=0;
|
|
|
|
/* 8254 PIT (Programmable Interval Timer) */
|
|
|
|
BX_PIT_THIS s.timer_handle[1] = BX_NULL_TIMER_HANDLE;
|
|
BX_PIT_THIS s.timer_handle[2] = BX_NULL_TIMER_HANDLE;
|
|
BX_PIT_THIS s.timer_handle[0] = BX_NULL_TIMER_HANDLE;
|
|
}
|
|
|
|
bx_pit_c::~bx_pit_c( void )
|
|
{
|
|
}
|
|
|
|
int
|
|
bx_pit_c::init( void )
|
|
{
|
|
DEV_register_irq(0, "8254 PIT");
|
|
DEV_register_ioread_handler(this, read_handler, 0x0040, "8254 PIT", 1);
|
|
DEV_register_ioread_handler(this, read_handler, 0x0041, "8254 PIT", 1);
|
|
DEV_register_ioread_handler(this, read_handler, 0x0042, "8254 PIT", 1);
|
|
DEV_register_ioread_handler(this, read_handler, 0x0043, "8254 PIT", 1);
|
|
DEV_register_ioread_handler(this, read_handler, 0x0061, "8254 PIT", 1);
|
|
|
|
DEV_register_iowrite_handler(this, write_handler, 0x0040, "8254 PIT", 1);
|
|
DEV_register_iowrite_handler(this, write_handler, 0x0041, "8254 PIT", 1);
|
|
DEV_register_iowrite_handler(this, write_handler, 0x0042, "8254 PIT", 1);
|
|
DEV_register_iowrite_handler(this, write_handler, 0x0043, "8254 PIT", 1);
|
|
DEV_register_iowrite_handler(this, write_handler, 0x0061, "8254 PIT", 1);
|
|
|
|
BX_DEBUG(("pit: starting init"));
|
|
|
|
BX_PIT_THIS s.speaker_data_on = 0;
|
|
BX_PIT_THIS s.refresh_clock_div2 = 0;
|
|
|
|
BX_PIT_THIS s.timer.init();
|
|
|
|
Bit64u my_time_usec = bx_virt_timer.time_usec();
|
|
|
|
if (BX_PIT_THIS s.timer_handle[0] == BX_NULL_TIMER_HANDLE) {
|
|
BX_PIT_THIS s.timer_handle[0] = bx_virt_timer.register_timer(this, timer_handler, (unsigned) 100 , 1, 1, "pit_wrap");
|
|
}
|
|
BX_DEBUG(("pit: RESETting timer."));
|
|
bx_virt_timer.deactivate_timer(BX_PIT_THIS s.timer_handle[0]);
|
|
BX_DEBUG(("deactivated timer."));
|
|
if(BX_PIT_THIS s.timer.get_next_event_time()) {
|
|
bx_virt_timer.activate_timer(BX_PIT_THIS s.timer_handle[0],
|
|
(Bit32u)BX_MAX(1,TICKS_TO_USEC(BX_PIT_THIS s.timer.get_next_event_time())),
|
|
0);
|
|
BX_DEBUG(("activated timer."));
|
|
}
|
|
BX_PIT_THIS s.last_next_event_time = BX_PIT_THIS s.timer.get_next_event_time();
|
|
BX_PIT_THIS s.last_usec=my_time_usec;
|
|
|
|
BX_PIT_THIS s.total_ticks=0;
|
|
BX_PIT_THIS s.total_usec=0;
|
|
|
|
BX_DEBUG(("pit: finished init"));
|
|
|
|
BX_DEBUG(("s.last_usec="FMT_LL"d",BX_PIT_THIS s.last_usec));
|
|
BX_DEBUG(("s.timer_id=%d",BX_PIT_THIS s.timer_handle[0]));
|
|
BX_DEBUG(("s.timer.get_next_event_time=%d",BX_PIT_THIS s.timer.get_next_event_time()));
|
|
BX_DEBUG(("s.last_next_event_time=%d",BX_PIT_THIS s.last_next_event_time));
|
|
|
|
return(1);
|
|
}
|
|
|
|
void
|
|
bx_pit_c::reset(unsigned type)
|
|
{
|
|
}
|
|
|
|
void
|
|
bx_pit_c::timer_handler(void *this_ptr) {
|
|
bx_pit_c * class_ptr = (bx_pit_c *) this_ptr;
|
|
|
|
class_ptr->handle_timer();
|
|
}
|
|
|
|
void
|
|
bx_pit_c::handle_timer() {
|
|
Bit64u my_time_usec = bx_virt_timer.time_usec();
|
|
Bit64u time_passed = my_time_usec-BX_PIT_THIS s.last_usec;
|
|
Bit32u time_passed32 = (Bit32u)time_passed;
|
|
|
|
BX_DEBUG(("pit: entering timer handler"));
|
|
|
|
if(time_passed32) {
|
|
periodic(time_passed32);
|
|
}
|
|
BX_PIT_THIS s.last_usec=BX_PIT_THIS s.last_usec + time_passed;
|
|
if(time_passed ||
|
|
(BX_PIT_THIS s.last_next_event_time
|
|
!= BX_PIT_THIS s.timer.get_next_event_time())
|
|
) {
|
|
BX_DEBUG(("pit: RESETting timer."));
|
|
bx_virt_timer.deactivate_timer(BX_PIT_THIS s.timer_handle[0]);
|
|
BX_DEBUG(("deactivated timer."));
|
|
if(BX_PIT_THIS s.timer.get_next_event_time()) {
|
|
bx_virt_timer.activate_timer(BX_PIT_THIS s.timer_handle[0],
|
|
(Bit32u)BX_MAX(1,TICKS_TO_USEC(BX_PIT_THIS s.timer.get_next_event_time())),
|
|
0);
|
|
BX_DEBUG(("activated timer."));
|
|
}
|
|
BX_PIT_THIS s.last_next_event_time = BX_PIT_THIS s.timer.get_next_event_time();
|
|
}
|
|
BX_DEBUG(("s.last_usec="FMT_LL"d",BX_PIT_THIS s.last_usec));
|
|
BX_DEBUG(("s.timer_id=%d",BX_PIT_THIS s.timer_handle[0]));
|
|
BX_DEBUG(("s.timer.get_next_event_time=%x",BX_PIT_THIS s.timer.get_next_event_time()));
|
|
BX_DEBUG(("s.last_next_event_time=%d",BX_PIT_THIS s.last_next_event_time));
|
|
}
|
|
|
|
|
|
// static IO port read callback handler
|
|
// redirects to non-static class handler to avoid virtual functions
|
|
|
|
Bit32u
|
|
bx_pit_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len)
|
|
{
|
|
#if !BX_USE_PIT_SMF
|
|
bx_pit_c *class_ptr = (bx_pit_c *) this_ptr;
|
|
|
|
return( class_ptr->read(address, io_len) );
|
|
}
|
|
|
|
|
|
Bit32u
|
|
bx_pit_c::read( Bit32u address, unsigned int io_len )
|
|
{
|
|
#else
|
|
UNUSED(this_ptr);
|
|
#endif // !BX_USE_PIT_SMF
|
|
BX_DEBUG(("pit: entering read handler"));
|
|
|
|
handle_timer();
|
|
|
|
Bit64u my_time_usec = bx_virt_timer.time_usec();
|
|
|
|
if (bx_dbg.pit)
|
|
BX_INFO(("pit: io read from port %04x", (unsigned) address));
|
|
|
|
switch (address) {
|
|
|
|
case 0x40: /* timer 0 - system ticks */
|
|
return(BX_PIT_THIS s.timer.read(0));
|
|
break;
|
|
case 0x41: /* timer 1 read */
|
|
return(BX_PIT_THIS s.timer.read(1));
|
|
break;
|
|
case 0x42: /* timer 2 read */
|
|
return(BX_PIT_THIS s.timer.read(2));
|
|
break;
|
|
case 0x43: /* timer 1 read */
|
|
return(BX_PIT_THIS s.timer.read(3));
|
|
break;
|
|
|
|
case 0x61:
|
|
/* AT, port 61h */
|
|
BX_PIT_THIS s.refresh_clock_div2 = (bx_bool)((my_time_usec / 15) & 1);
|
|
return( (BX_PIT_THIS s.timer.read_OUT(2)<<5) |
|
|
(BX_PIT_THIS s.refresh_clock_div2<<4) |
|
|
(BX_PIT_THIS s.speaker_data_on<<1) |
|
|
(BX_PIT_THIS s.timer.read_GATE(2)?1:0) );
|
|
break;
|
|
|
|
default:
|
|
BX_PANIC(("pit: unsupported io read from port %04x", address));
|
|
}
|
|
return(0); /* keep compiler happy */
|
|
}
|
|
|
|
|
|
// static IO port write callback handler
|
|
// redirects to non-static class handler to avoid virtual functions
|
|
|
|
void
|
|
bx_pit_c::write_handler(void *this_ptr, Bit32u address, Bit32u dvalue, unsigned io_len)
|
|
{
|
|
#if !BX_USE_PIT_SMF
|
|
bx_pit_c *class_ptr = (bx_pit_c *) this_ptr;
|
|
|
|
class_ptr->write(address, dvalue, io_len);
|
|
}
|
|
|
|
void
|
|
bx_pit_c::write( Bit32u address, Bit32u dvalue,
|
|
unsigned int io_len )
|
|
{
|
|
#else
|
|
UNUSED(this_ptr);
|
|
#endif // !BX_USE_PIT_SMF
|
|
Bit8u value;
|
|
Bit64u my_time_usec = bx_virt_timer.time_usec();
|
|
Bit64u time_passed = my_time_usec-BX_PIT_THIS s.last_usec;
|
|
Bit32u time_passed32 = (Bit32u)time_passed;
|
|
|
|
BX_DEBUG(("pit: entering write handler"));
|
|
|
|
if(time_passed32) {
|
|
periodic(time_passed32);
|
|
}
|
|
BX_PIT_THIS s.last_usec=BX_PIT_THIS s.last_usec + time_passed;
|
|
|
|
value = (Bit8u ) dvalue;
|
|
|
|
if (bx_dbg.pit)
|
|
BX_INFO(("pit: write to port %04x = %02x",
|
|
(unsigned) address, (unsigned) value));
|
|
|
|
switch (address) {
|
|
case 0x40: /* timer 0: write count register */
|
|
BX_PIT_THIS s.timer.write(0,value);
|
|
break;
|
|
|
|
case 0x41: /* timer 1: write count register */
|
|
BX_PIT_THIS s.timer.write( 1,value );
|
|
break;
|
|
|
|
case 0x42: /* timer 2: write count register */
|
|
BX_PIT_THIS s.timer.write( 2,value );
|
|
break;
|
|
|
|
case 0x43: /* timer 0-2 mode control */
|
|
BX_PIT_THIS s.timer.write( 3,value );
|
|
break;
|
|
|
|
case 0x61:
|
|
BX_PIT_THIS s.speaker_data_on = (value >> 1) & 0x01;
|
|
if ( BX_PIT_THIS s.speaker_data_on ) {
|
|
DEV_speaker_beep_on(1193180.0 / this->get_timer(2));
|
|
} else {
|
|
DEV_speaker_beep_off();
|
|
}
|
|
/*??? only on AT+ */
|
|
BX_PIT_THIS s.timer.set_GATE(2, value & 0x01);
|
|
#if BX_CPU_LEVEL < 2
|
|
/* ??? XT: */
|
|
bx_kbd_port61h_write(value);
|
|
#endif
|
|
break;
|
|
|
|
default:
|
|
BX_PANIC(("pit: unsupported io write to port %04x = %02x",
|
|
(unsigned) address, (unsigned) value));
|
|
}
|
|
|
|
if ((BX_PIT_THIS s.timer.read_OUT(0))==1) {
|
|
DEV_pic_raise_irq(0);
|
|
} else {
|
|
DEV_pic_lower_irq(0);
|
|
}
|
|
|
|
if(time_passed ||
|
|
(BX_PIT_THIS s.last_next_event_time
|
|
!= BX_PIT_THIS s.timer.get_next_event_time())
|
|
) {
|
|
BX_DEBUG(("pit: RESETting timer."));
|
|
bx_virt_timer.deactivate_timer(BX_PIT_THIS s.timer_handle[0]);
|
|
BX_DEBUG(("deactivated timer."));
|
|
if(BX_PIT_THIS s.timer.get_next_event_time()) {
|
|
bx_virt_timer.activate_timer(BX_PIT_THIS s.timer_handle[0],
|
|
(Bit32u)BX_MAX(1,TICKS_TO_USEC(BX_PIT_THIS s.timer.get_next_event_time())),
|
|
0);
|
|
BX_DEBUG(("activated timer."));
|
|
}
|
|
BX_PIT_THIS s.last_next_event_time = BX_PIT_THIS s.timer.get_next_event_time();
|
|
}
|
|
BX_DEBUG(("s.last_usec="FMT_LL"d",BX_PIT_THIS s.last_usec));
|
|
BX_DEBUG(("s.timer_id=%d",BX_PIT_THIS s.timer_handle[0]));
|
|
BX_DEBUG(("s.timer.get_next_event_time=%x",BX_PIT_THIS s.timer.get_next_event_time()));
|
|
BX_DEBUG(("s.last_next_event_time=%d",BX_PIT_THIS s.last_next_event_time));
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
bx_pit_c::SaveState( class state_file *fd )
|
|
{
|
|
fd->write_check ("8254 start");
|
|
fd->write (&BX_PIT_THIS s, sizeof (BX_PIT_THIS s));
|
|
fd->write_check ("8254 end");
|
|
return(0);
|
|
}
|
|
|
|
|
|
int
|
|
bx_pit_c::LoadState( class state_file *fd )
|
|
{
|
|
fd->read_check ("8254 start");
|
|
fd->read (&BX_PIT_THIS s, sizeof (BX_PIT_THIS s));
|
|
fd->read_check ("8254 end");
|
|
return(0);
|
|
}
|
|
|
|
|
|
#if 0
|
|
void
|
|
bx_kbd_port61h_write(Bit8u value)
|
|
{
|
|
// PcError("KBD_PORT61H_WRITE(): not implemented yet");
|
|
UNUSED( value );
|
|
}
|
|
#endif
|
|
|
|
|
|
bx_bool
|
|
bx_pit_c::periodic( Bit32u usec_delta )
|
|
{
|
|
bx_bool prev_timer0_out = BX_PIT_THIS s.timer.read_OUT(0);
|
|
bx_bool want_interrupt = 0;
|
|
Bit32u ticks_delta = 0;
|
|
|
|
#ifdef BX_SCHEDULED_DIE_TIME
|
|
if (bx_pc_system.time_ticks() > BX_SCHEDULED_DIE_TIME) {
|
|
BX_ERROR (("ticks exceeded scheduled die time, quitting"));
|
|
BX_EXIT (2);
|
|
}
|
|
#endif
|
|
|
|
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 >= TICKS_PER_SECOND) && (BX_PIT_THIS s.total_usec >= USEC_PER_SECOND)) {
|
|
BX_PIT_THIS s.total_ticks -= TICKS_PER_SECOND;
|
|
BX_PIT_THIS s.total_usec -= USEC_PER_SECOND;
|
|
}
|
|
|
|
while(ticks_delta>0) {
|
|
Bit32u maxchange=BX_PIT_THIS s.timer.get_next_event_time();
|
|
Bit32u timedelta=maxchange;
|
|
if((maxchange==0) || (maxchange>ticks_delta)) {
|
|
timedelta=ticks_delta;
|
|
}
|
|
BX_PIT_THIS s.timer.clock_all(timedelta);
|
|
if ( (prev_timer0_out==0) ) {
|
|
if ((BX_PIT_THIS s.timer.read_OUT(0))==1) {
|
|
DEV_pic_raise_irq(0);
|
|
prev_timer0_out=1;
|
|
}
|
|
} else {
|
|
if ((BX_PIT_THIS s.timer.read_OUT(0))==0) {
|
|
DEV_pic_lower_irq(0);
|
|
prev_timer0_out=0;
|
|
}
|
|
}
|
|
prev_timer0_out=BX_PIT_THIS s.timer.read_OUT(0);
|
|
ticks_delta-=timedelta;
|
|
}
|
|
|
|
return(want_interrupt);
|
|
}
|
|
|
|
#endif // #if BX_USE_NEW_PIT
|