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[Core/CD] fixed Main-CPU/Sub-CPU synchronization edge case

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This commit is contained in:
ekeeke 2019-03-23 13:55:44 +01:00
parent 31a15eaf7c
commit cae62cd675
3 changed files with 40 additions and 4 deletions
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14
core/cd_hw/scd.c
View File

@ -445,10 +445,16 @@ static void s68k_poll_sync(unsigned int reg_mask)
/* relative MAIN-CPU cycle counter */
unsigned int cycles = (s68k.cycles * MCYCLES_PER_LINE) / SCYCLES_PER_LINE;
/* sync MAIN-CPU with SUB-CPU */
if (!m68k.stopped)
{
/* save current MAIN-CPU end cycle count (recursive execution is possible) */
int end_cycle = m68k.cycle_end;
/* sync MAIN-CPU with SUB-CPU */
m68k_run(cycles);
/* restore MAIN-CPU end cycle count */
m68k.cycle_end = end_cycle;
}
/* MAIN-CPU idle on register polling ? */
@ -669,8 +675,14 @@ static unsigned int scd_read_word(unsigned int address)
/* relative MAIN-CPU cycle counter */
unsigned int cycles = (s68k.cycles * MCYCLES_PER_LINE) / SCYCLES_PER_LINE;
/* save current MAIN-CPU end cycle count (recursive execution is possible) */
int end_cycle = m68k.cycle_end;
/* sync MAIN-CPU with SUB-CPU (Mighty Morphin Power Rangers) */
m68k_run(cycles);
/* restore MAIN-CPU end cycle count */
m68k.cycle_end = end_cycle;
}
s68k_poll_detect(3 << (address & 0x1e));

28
core/mem68k.c
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@ -3,7 +3,7 @@
* Main 68k bus handlers
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
@ -268,10 +268,16 @@ static void m68k_poll_sync(unsigned int reg_mask)
/* relative SUB-CPU cycle counter */
unsigned int cycles = (m68k.cycles * SCYCLES_PER_LINE) / MCYCLES_PER_LINE;
/* sync SUB-CPU with MAIN-CPU */
if (!s68k.stopped)
{
/* save current SUB-CPU end cycle count (recursive execution is possible) */
int end_cycle = s68k.cycle_end;
/* sync SUB-CPU with MAIN-CPU */
s68k_run(cycles);
/* restore SUB-CPU end cycle count */
s68k.cycle_end = end_cycle;
}
/* SUB-CPU idle on register polling ? */
@ -354,8 +360,14 @@ unsigned int ctrl_io_read_byte(unsigned int address)
/* relative SUB-CPU cycle counter */
unsigned int cycles = (m68k.cycles * SCYCLES_PER_LINE) / MCYCLES_PER_LINE;
/* save current SUB-CPU end cycle count (recursive execution is possible) */
int end_cycle = s68k.cycle_end;
/* sync SUB-CPU with MAIN-CPU (Dracula Unleashed w/ Sega CD Model 2 Boot ROM) */
s68k_run(cycles);
/* restore SUB-CPU end cycle count */
s68k.cycle_end = end_cycle;
}
m68k_poll_detect(1<<0x0f);
@ -527,8 +539,14 @@ unsigned int ctrl_io_read_word(unsigned int address)
/* relative SUB-CPU cycle counter */
unsigned int cycles = (m68k.cycles * SCYCLES_PER_LINE) / MCYCLES_PER_LINE;
/* save current SUB-CPU end cycle count (recursive execution is possible) */
int end_cycle = s68k.cycle_end;
/* sync SUB-CPU with MAIN-CPU (Soul Star) */
s68k_run(cycles);
/* restore SUB-CPU end cycle count */
s68k.cycle_end = end_cycle;
}
m68k_poll_detect(3 << (index - 0x10));
@ -646,8 +664,14 @@ void ctrl_io_write_byte(unsigned int address, unsigned int data)
/* relative SUB-CPU cycle counter */
unsigned int cycles = (m68k.cycles * SCYCLES_PER_LINE) / MCYCLES_PER_LINE;
/* save current SUB-CPU end cycle count (recursive execution is possible) */
int end_cycle = s68k.cycle_end;
/* sync SUB-CPU with MAIN-CPU (Earnest Evans, Fhey Area) */
s68k_run(cycles);
/* restore SUB-CPU end cycle count */
s68k.cycle_end = end_cycle;
}
/* set IFL2 flag */

2
core/mem68k.h
View File

@ -3,7 +3,7 @@
* Main 68k bus handlers
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: