e662318422
the first timer is connected to IRQ line 0) - code cleanup (indent mode, bool types, reset function, unused stuff)
397 lines
12 KiB
C++
397 lines
12 KiB
C++
///////////////////////////////////////////////////////////////////////
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// $Id: pit_wrap.cc,v 1.60 2006-01-08 20:39:08 vruppert 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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#include "iodev.h"
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#if BX_USE_NEW_PIT
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#include "speaker.h"
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//Important constant #defines:
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#define USEC_PER_SECOND (1000000)
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//1.193181MHz Clock
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#define TICKS_PER_SECOND (1193181)
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// define a macro to convert floating point numbers into 64-bit integers.
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// In MSVC++ you can convert a 64-bit float into a 64-bit signed integer,
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// but it will not convert a 64-bit float into a 64-bit unsigned integer.
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// This macro works around that.
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#define F2I(x) ((Bit64u)(Bit64s) (x))
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#define I2F(x) ((double)(Bit64s) (x))
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//DEBUG configuration:
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//Set up Logging.
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#define LOG_THIS bx_pit.
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//A single instance.
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bx_pit_c bx_pit;
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#if BX_USE_PIT_SMF
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#define this (&bx_pit)
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#endif
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//Workaround for environments where OUT is defined.
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#ifdef OUT
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# undef OUT
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#endif
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//Generic MAX and MIN Functions
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#define BX_MAX(a,b) ( ((a)>(b))?(a):(b) )
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#define BX_MIN(a,b) ( ((a)>(b))?(b):(a) )
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//USEC_ALPHA is multiplier for the past.
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//USEC_ALPHA_B is 1-USEC_ALPHA, or multiplier for the present.
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#define USEC_ALPHA ((double)(.8))
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#define USEC_ALPHA_B ((double)(((double)1)-USEC_ALPHA))
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#define USEC_ALPHA2 ((double)(.5))
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#define USEC_ALPHA2_B ((double)(((double)1)-USEC_ALPHA2))
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#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))))))
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//PIT tick to usec conversion functions:
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//Direct conversions:
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#define TICKS_TO_USEC(a) ( ((a)*USEC_PER_SECOND)/TICKS_PER_SECOND )
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#define USEC_TO_TICKS(a) ( ((a)*TICKS_PER_SECOND)/USEC_PER_SECOND )
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bx_pit_c::bx_pit_c( void )
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{
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put("PIT");
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settype(PITLOG);
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s.speaker_data_on=0;
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/* 8254 PIT (Programmable Interval Timer) */
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BX_PIT_THIS s.timer_handle[1] = BX_NULL_TIMER_HANDLE;
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BX_PIT_THIS s.timer_handle[2] = BX_NULL_TIMER_HANDLE;
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BX_PIT_THIS s.timer_handle[0] = BX_NULL_TIMER_HANDLE;
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}
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bx_pit_c::~bx_pit_c( void )
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{
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}
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int
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bx_pit_c::init( void )
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{
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DEV_register_irq(0, "8254 PIT");
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DEV_register_ioread_handler(this, read_handler, 0x0040, "8254 PIT", 1);
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DEV_register_ioread_handler(this, read_handler, 0x0041, "8254 PIT", 1);
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DEV_register_ioread_handler(this, read_handler, 0x0042, "8254 PIT", 1);
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DEV_register_ioread_handler(this, read_handler, 0x0043, "8254 PIT", 1);
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DEV_register_ioread_handler(this, read_handler, 0x0061, "8254 PIT", 1);
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DEV_register_iowrite_handler(this, write_handler, 0x0040, "8254 PIT", 1);
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DEV_register_iowrite_handler(this, write_handler, 0x0041, "8254 PIT", 1);
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DEV_register_iowrite_handler(this, write_handler, 0x0042, "8254 PIT", 1);
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DEV_register_iowrite_handler(this, write_handler, 0x0043, "8254 PIT", 1);
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DEV_register_iowrite_handler(this, write_handler, 0x0061, "8254 PIT", 1);
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BX_DEBUG(("pit: starting init"));
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BX_PIT_THIS s.speaker_data_on = 0;
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BX_PIT_THIS s.refresh_clock_div2 = 0;
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BX_PIT_THIS s.timer.init();
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BX_PIT_THIS s.timer.set_OUT_handler(0, irq_handler);
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Bit64u my_time_usec = bx_virt_timer.time_usec();
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if (BX_PIT_THIS s.timer_handle[0] == BX_NULL_TIMER_HANDLE) {
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BX_PIT_THIS s.timer_handle[0] = bx_virt_timer.register_timer(this, timer_handler, (unsigned) 100 , 1, 1, "pit_wrap");
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}
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BX_DEBUG(("pit: RESETting timer."));
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bx_virt_timer.deactivate_timer(BX_PIT_THIS s.timer_handle[0]);
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BX_DEBUG(("deactivated timer."));
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if(BX_PIT_THIS s.timer.get_next_event_time()) {
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bx_virt_timer.activate_timer(BX_PIT_THIS s.timer_handle[0],
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(Bit32u)BX_MAX(1,TICKS_TO_USEC(BX_PIT_THIS s.timer.get_next_event_time())),
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0);
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BX_DEBUG(("activated timer."));
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}
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BX_PIT_THIS s.last_next_event_time = BX_PIT_THIS s.timer.get_next_event_time();
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BX_PIT_THIS s.last_usec=my_time_usec;
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BX_PIT_THIS s.total_ticks=0;
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BX_PIT_THIS s.total_usec=0;
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BX_DEBUG(("pit: finished init"));
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BX_DEBUG(("s.last_usec="FMT_LL"d",BX_PIT_THIS s.last_usec));
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BX_DEBUG(("s.timer_id=%d",BX_PIT_THIS s.timer_handle[0]));
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BX_DEBUG(("s.timer.get_next_event_time=%d",BX_PIT_THIS s.timer.get_next_event_time()));
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BX_DEBUG(("s.last_next_event_time=%d",BX_PIT_THIS s.last_next_event_time));
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return(1);
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}
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void
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bx_pit_c::reset(unsigned type)
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{
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BX_PIT_THIS s.timer.reset(type);
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}
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void
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bx_pit_c::timer_handler(void *this_ptr) {
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bx_pit_c * class_ptr = (bx_pit_c *) this_ptr;
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class_ptr->handle_timer();
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}
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void
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bx_pit_c::handle_timer() {
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Bit64u my_time_usec = bx_virt_timer.time_usec();
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Bit64u time_passed = my_time_usec-BX_PIT_THIS s.last_usec;
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Bit32u time_passed32 = (Bit32u)time_passed;
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BX_DEBUG(("pit: entering timer handler"));
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if(time_passed32) {
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periodic(time_passed32);
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}
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BX_PIT_THIS s.last_usec=BX_PIT_THIS s.last_usec + time_passed;
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if(time_passed ||
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(BX_PIT_THIS s.last_next_event_time
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!= BX_PIT_THIS s.timer.get_next_event_time())
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) {
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BX_DEBUG(("pit: RESETting timer."));
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bx_virt_timer.deactivate_timer(BX_PIT_THIS s.timer_handle[0]);
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BX_DEBUG(("deactivated timer."));
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if(BX_PIT_THIS s.timer.get_next_event_time()) {
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bx_virt_timer.activate_timer(BX_PIT_THIS s.timer_handle[0],
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(Bit32u)BX_MAX(1,TICKS_TO_USEC(BX_PIT_THIS s.timer.get_next_event_time())),
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0);
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BX_DEBUG(("activated timer."));
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}
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BX_PIT_THIS s.last_next_event_time = BX_PIT_THIS s.timer.get_next_event_time();
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}
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BX_DEBUG(("s.last_usec="FMT_LL"d",BX_PIT_THIS s.last_usec));
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BX_DEBUG(("s.timer_id=%d",BX_PIT_THIS s.timer_handle[0]));
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BX_DEBUG(("s.timer.get_next_event_time=%x",BX_PIT_THIS s.timer.get_next_event_time()));
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BX_DEBUG(("s.last_next_event_time=%d",BX_PIT_THIS s.last_next_event_time));
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}
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// static IO port read callback handler
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// redirects to non-static class handler to avoid virtual functions
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Bit32u
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bx_pit_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len)
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{
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#if !BX_USE_PIT_SMF
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bx_pit_c *class_ptr = (bx_pit_c *) this_ptr;
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return( class_ptr->read(address, io_len) );
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}
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Bit32u
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bx_pit_c::read( Bit32u address, unsigned int io_len )
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{
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#else
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UNUSED(this_ptr);
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#endif // !BX_USE_PIT_SMF
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BX_DEBUG(("pit: entering read handler"));
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handle_timer();
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Bit64u my_time_usec = bx_virt_timer.time_usec();
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if (bx_dbg.pit)
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BX_INFO(("pit: io read from port %04x", (unsigned) address));
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switch (address) {
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case 0x40: /* timer 0 - system ticks */
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return(BX_PIT_THIS s.timer.read(0));
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break;
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case 0x41: /* timer 1 read */
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return(BX_PIT_THIS s.timer.read(1));
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break;
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case 0x42: /* timer 2 read */
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return(BX_PIT_THIS s.timer.read(2));
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break;
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case 0x43: /* timer 1 read */
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return(BX_PIT_THIS s.timer.read(3));
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break;
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case 0x61:
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/* AT, port 61h */
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BX_PIT_THIS s.refresh_clock_div2 = (bx_bool)((my_time_usec / 15) & 1);
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return( (BX_PIT_THIS s.timer.read_OUT(2)<<5) |
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(BX_PIT_THIS s.refresh_clock_div2<<4) |
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(BX_PIT_THIS s.speaker_data_on<<1) |
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(BX_PIT_THIS s.timer.read_GATE(2)?1:0) );
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break;
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default:
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BX_PANIC(("pit: unsupported io read from port %04x", address));
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}
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return(0); /* keep compiler happy */
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}
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// static IO port write callback handler
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// redirects to non-static class handler to avoid virtual functions
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void
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bx_pit_c::write_handler(void *this_ptr, Bit32u address, Bit32u dvalue, unsigned io_len)
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{
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#if !BX_USE_PIT_SMF
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bx_pit_c *class_ptr = (bx_pit_c *) this_ptr;
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class_ptr->write(address, dvalue, io_len);
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}
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void
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bx_pit_c::write( Bit32u address, Bit32u dvalue,
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unsigned int io_len )
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{
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#else
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UNUSED(this_ptr);
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#endif // !BX_USE_PIT_SMF
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Bit8u value;
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Bit64u my_time_usec = bx_virt_timer.time_usec();
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Bit64u time_passed = my_time_usec-BX_PIT_THIS s.last_usec;
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Bit32u time_passed32 = (Bit32u)time_passed;
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BX_DEBUG(("pit: entering write handler"));
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if(time_passed32) {
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periodic(time_passed32);
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}
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BX_PIT_THIS s.last_usec=BX_PIT_THIS s.last_usec + time_passed;
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value = (Bit8u ) dvalue;
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if (bx_dbg.pit)
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BX_INFO(("pit: write to port %04x = %02x",
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(unsigned) address, (unsigned) value));
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switch (address) {
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case 0x40: /* timer 0: write count register */
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BX_PIT_THIS s.timer.write(0,value);
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break;
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case 0x41: /* timer 1: write count register */
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BX_PIT_THIS s.timer.write( 1,value );
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break;
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case 0x42: /* timer 2: write count register */
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BX_PIT_THIS s.timer.write( 2,value );
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break;
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case 0x43: /* timer 0-2 mode control */
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BX_PIT_THIS s.timer.write( 3,value );
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break;
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case 0x61:
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BX_PIT_THIS s.speaker_data_on = (value >> 1) & 0x01;
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if ( BX_PIT_THIS s.speaker_data_on ) {
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DEV_speaker_beep_on((float)(1193180.0 / this->get_timer(2)));
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} else {
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DEV_speaker_beep_off();
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}
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/* ??? only on AT+ */
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BX_PIT_THIS s.timer.set_GATE(2, value & 0x01);
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break;
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default:
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BX_PANIC(("pit: unsupported io write to port %04x = %02x",
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(unsigned) address, (unsigned) value));
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}
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if(time_passed ||
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(BX_PIT_THIS s.last_next_event_time
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!= BX_PIT_THIS s.timer.get_next_event_time())
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) {
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BX_DEBUG(("pit: RESETting timer."));
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bx_virt_timer.deactivate_timer(BX_PIT_THIS s.timer_handle[0]);
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BX_DEBUG(("deactivated timer."));
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if(BX_PIT_THIS s.timer.get_next_event_time()) {
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bx_virt_timer.activate_timer(BX_PIT_THIS s.timer_handle[0],
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(Bit32u)BX_MAX(1,TICKS_TO_USEC(BX_PIT_THIS s.timer.get_next_event_time())),
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0);
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BX_DEBUG(("activated timer."));
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}
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BX_PIT_THIS s.last_next_event_time = BX_PIT_THIS s.timer.get_next_event_time();
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}
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BX_DEBUG(("s.last_usec="FMT_LL"d",BX_PIT_THIS s.last_usec));
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BX_DEBUG(("s.timer_id=%d",BX_PIT_THIS s.timer_handle[0]));
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BX_DEBUG(("s.timer.get_next_event_time=%x",BX_PIT_THIS s.timer.get_next_event_time()));
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BX_DEBUG(("s.last_next_event_time=%d",BX_PIT_THIS s.last_next_event_time));
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}
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bx_bool bx_pit_c::periodic(Bit32u usec_delta)
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{
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Bit32u ticks_delta = 0;
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#ifdef BX_SCHEDULED_DIE_TIME
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if (bx_pc_system.time_ticks() > BX_SCHEDULED_DIE_TIME) {
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BX_ERROR (("ticks exceeded scheduled die time, quitting"));
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BX_EXIT (2);
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}
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#endif
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BX_PIT_THIS s.total_usec += usec_delta;
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ticks_delta=(Bit32u)((USEC_TO_TICKS((Bit64u)(BX_PIT_THIS s.total_usec)))-BX_PIT_THIS s.total_ticks);
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BX_PIT_THIS s.total_ticks += ticks_delta;
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while ((BX_PIT_THIS s.total_ticks >= TICKS_PER_SECOND) && (BX_PIT_THIS s.total_usec >= USEC_PER_SECOND)) {
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BX_PIT_THIS s.total_ticks -= TICKS_PER_SECOND;
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BX_PIT_THIS s.total_usec -= USEC_PER_SECOND;
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}
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while(ticks_delta>0) {
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Bit32u maxchange=BX_PIT_THIS s.timer.get_next_event_time();
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Bit32u timedelta=maxchange;
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if((maxchange==0) || (maxchange>ticks_delta)) {
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timedelta=ticks_delta;
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}
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BX_PIT_THIS s.timer.clock_all(timedelta);
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ticks_delta-=timedelta;
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}
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return 0;
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}
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void bx_pit_c::irq_handler(bx_bool value)
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{
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if (value == 1) {
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DEV_pic_raise_irq(0);
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} else {
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DEV_pic_lower_irq(0);
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}
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}
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#endif // #if BX_USE_NEW_PIT
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