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Fix problem with PIT when the machine is being really slow. 

This means that the REALTIME_PIT now only works on machines
that are capable of sustaining 150000 IPS, in aggregate.  This
seems a reasonable requirement, as even my 200Mhz PPC with 16MB
of memory can sustain that.

This is now probably ready for primetime, so I need to get it
added to the configure options.
This commit is contained in:
Gregory Alexander 2002-05-21 15:07:45 +00:00
parent d1fbbd6f5c
commit b30fdb2487
1 changed files with 3 additions and 1 deletions
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4
bochs/iodev/pit_wrap.cc
View File

@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: pit_wrap.cc,v 1.18 2002-05-20 21:53:25 yakovlev Exp $
// $Id: pit_wrap.cc,v 1.19 2002-05-21 15:07:45 yakovlev Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002 MandrakeSoft S.A.
@ -47,6 +47,7 @@ bx_pit_c bx_pit;
#define TIME_DIVIDER (1)
#define TIME_MULTIPLIER (1)
#define TIME_HEADSTART (1)
#define MIN_USEC_PER_SECOND (150000)
//USEC_ALPHA is multiplier for the past.
//USEC_ALPHA_B is 1-USEC_ALPHA, or multiplier for the present.
#define USEC_ALPHA ((double)(.8))
@ -504,6 +505,7 @@ bx_pit_c::second_update_data(void) {
// BX_PIT_THIS s.usec_per_second = ALPHA_LOWER(BX_PIT_THIS s.usec_per_second,((bx_pc_system.time_usec()-BX_PIT_THIS s.last_sec_usec)/timediff));
BX_PIT_THIS s.usec_per_second = ((bx_pc_system.time_usec()-BX_PIT_THIS s.last_sec_usec)/timediff);
BX_PIT_THIS s.usec_per_second = MAX(BX_PIT_THIS s.usec_per_second , MIN_USEC_PER_SECOND);
BX_PIT_THIS s.last_sec_usec = bx_pc_system.time_usec();
#if DEBUG_REALTIME_WITH_PRINTF
printf("Parms: ticks_per_second=%lld, usec_per_second=%lld\n",BX_PIT_THIS s.ticks_per_second, BX_PIT_THIS s.usec_per_second);