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Implemented support for SH-2 cycle steal mode, used by Fever Soccer [David Haywood]

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This commit is contained in:
Angelo Salese 2010-09-28 14:38:24 +00:00
parent 79c96d826d
commit 5a212b726e
2 changed files with 29 additions and 48 deletions
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76
src/emu/cpu/sh2/sh2comn.c
View File

@ -151,16 +151,11 @@ static TIMER_CALLBACK( sh2_timer_callback )
we're currently doing a)
b) seems to cause issues with ST-V games
b) causes problems with ST-V games
*/
// Fever Soccer requires stupidly fast DMA or the palette gets corrupt due
// to DMA being cancelled mid-flight. Are we incorrectly emulating some other register?
#define DMA_TIMER_STEP (ATTOTIME_IN_NSEC(1))
// have a bigger delay if no data is available, as it will take some time before there is
// any, and having such a high frequency timer with no data is not a good idea
#define DMA_TIMER_STEP_IF_UNAVAILABLE (ATTOTIME_IN_NSEC(1000))
void sh2_do_dma(sh2_state *sh2, int dma)
{
@ -170,7 +165,10 @@ void sh2_do_dma(sh2_state *sh2, int dma)
if (sh2->active_dma_count[dma] > 0)
{
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], sh2->device->cycles_to_attotime(2), dma);
#endif
// process current DMA
switch(sh2->active_dma_size[dma])
@ -196,20 +194,9 @@ void sh2_do_dma(sh2_state *sh2, int dma)
int available = sh2->dma_callback_fifo_data_available(tempsrc, tempdst, 0, sh2->active_dma_size[dma]);
if (!available)
{
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP_IF_UNAVAILABLE , dma);
#endif
return;
}
}
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP , dma);
#endif
dmadata = sh2->program->read_byte(tempsrc);
if (sh2->dma_callback_kludge) dmadata = sh2->dma_callback_kludge(tempsrc, tempdst, dmadata, sh2->active_dma_size[dma]);
@ -246,20 +233,9 @@ void sh2_do_dma(sh2_state *sh2, int dma)
int available = sh2->dma_callback_fifo_data_available(tempsrc, tempdst, 0, sh2->active_dma_size[dma]);
if (!available)
{
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP_IF_UNAVAILABLE , dma);
#endif
return;
}
}
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP , dma);
#endif
// check: should this really be using read_word_32 / write_word_32?
dmadata = sh2->program->read_word(tempsrc);
if (sh2->dma_callback_kludge) dmadata = sh2->dma_callback_kludge(tempsrc, tempdst, dmadata, sh2->active_dma_size[dma]);
@ -295,20 +271,9 @@ void sh2_do_dma(sh2_state *sh2, int dma)
int available = sh2->dma_callback_fifo_data_available(tempsrc, tempdst, 0, sh2->active_dma_size[dma]);
if (!available)
{
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP_IF_UNAVAILABLE , dma);
#endif
return;
}
}
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP , dma);
#endif
dmadata = sh2->program->read_dword(tempsrc);
if (sh2->dma_callback_kludge) dmadata = sh2->dma_callback_kludge(tempsrc, tempdst, dmadata, sh2->active_dma_size[dma]);
sh2->program->write_dword(tempdst, dmadata);
@ -345,12 +310,6 @@ void sh2_do_dma(sh2_state *sh2, int dma)
fatalerror("SH2 dma_callback_fifo_data_available == 0 in unsupported mode");
}
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP , dma);
#endif
dmadata = sh2->program->read_dword(tempsrc);
if (sh2->dma_callback_kludge) dmadata = sh2->dma_callback_kludge(tempsrc, tempdst, dmadata, sh2->active_dma_size[dma]);
sh2->program->write_dword(tempdst, dmadata);
@ -384,6 +343,13 @@ void sh2_do_dma(sh2_state *sh2, int dma)
// int dma = param & 1;
// sh2_state *sh2 = (sh2_state *)ptr;
// fever soccer uses cycle-stealing mode, resume the CPU now DMA has finished
if (sh2->active_dma_steal[dma])
{
sh2->device->resume(SUSPEND_REASON_HALT );
}
LOG(("SH2.%s: DMA %d complete\n", sh2->device->tag(), dma));
sh2->m[0x63+4*dma] |= 2;
sh2->dma_timer_active[dma] = 0;
@ -411,6 +377,8 @@ static void sh2_dmac_check(sh2_state *sh2, int dma)
sh2->active_dma_incd[dma] = (sh2->m[0x63+4*dma] >> 14) & 3;
sh2->active_dma_incs[dma] = (sh2->m[0x63+4*dma] >> 12) & 3;
sh2->active_dma_size[dma] = (sh2->m[0x63+4*dma] >> 10) & 3;
sh2->active_dma_steal[dma] = (sh2->m[0x63+4*dma] &0x10);
if(sh2->active_dma_incd[dma] == 3 || sh2->active_dma_incs[dma] == 3)
{
logerror("SH2: DMA: bad increment values (%d, %d, %d, %04x)\n", sh2->active_dma_incd[dma], sh2->active_dma_incs[dma], sh2->active_dma_size[dma], sh2->m[0x63+4*dma]);
@ -447,9 +415,21 @@ static void sh2_dmac_check(sh2_state *sh2, int dma)
sh2->active_dma_count[dma] &= ~3;
break;
}
#ifdef USE_TIMER_FOR_DMA
// start DMA timer
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], attotime_zero, dma);
// fever soccer uses cycle-stealing mode, requiring the CPU to be halted
if (sh2->active_dma_steal[dma])
{
//printf("cycle stealing DMA\n");
sh2->device->suspend(SUSPEND_REASON_HALT, 1 );
}
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], sh2->device->cycles_to_attotime(2), dma);
#endif
}

1
src/emu/cpu/sh2/sh2comn.h
View File

@ -141,6 +141,7 @@ typedef struct
int active_dma_incs[2];
int active_dma_incd[2];
int active_dma_size[2];
int active_dma_steal[2];
UINT32 active_dma_src[2];
UINT32 active_dma_dst[2];
UINT32 active_dma_count[2];