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Added cycle remainder for FRC in SH-2 [Angelo Salese] (note to Arbee: please double check this)

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This commit is contained in:
Angelo Salese 2011-07-15 13:22:47 +00:00
parent 8156398359
commit ce6605f907
3 changed files with 17 additions and 2 deletions
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1
src/emu/cpu/sh2/sh2.c
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@ -2173,6 +2173,7 @@ static CPU_RESET( sh2 )
memset(&sh2->irq_queue[0], 0, sizeof(sh2->irq_queue[0])*16);
memset(&sh2->irq_line_state[0], 0, sizeof(sh2->irq_line_state[0])*17);
sh2->frc = sh2->ocra = sh2->ocrb = sh2->icr = 0;
sh2->frc_remainder = 0;
sh2->frc_base = 0;
sh2->frt_input = sh2->internal_irq_level = sh2->internal_irq_vector = 0;
sh2->dma_timer_active[0] = sh2->dma_timer_active[1] = 0;

17
src/emu/cpu/sh2/sh2comn.c
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@ -64,7 +64,17 @@ static void sh2_timer_resync(sh2_state *sh2)
UINT64 cur_time = sh2->device->total_cycles();
if(divider)
sh2->frc += (cur_time - sh2->frc_base) >> divider;
{
sh2->frc += (cur_time - sh2->frc_base) / (1 << divider);
sh2->frc_remainder += (cur_time - sh2->frc_base) % (1 << divider);
if(sh2->frc_remainder >= divider)
{
sh2->frc_remainder-=divider;
sh2->frc++;
}
}
sh2->frc_base = cur_time;
}
@ -119,6 +129,7 @@ static TIMER_CALLBACK( sh2_timer_callback )
if(frc == sh2->ocrb)
sh2->m[4] |= OCFB;
/* FIXME: frc increments isn't stable! */
if(frc == 0x0000)
sh2->m[4] |= OVF;
@ -127,7 +138,7 @@ static TIMER_CALLBACK( sh2_timer_callback )
sh2->m[4] |= OCFA;
if(sh2->m[4] & 0x010000)
sh2->frc = 0;
sh2->frc = sh2->frc_remainder = 0;
}
sh2_recalc_irq(sh2);
@ -528,6 +539,7 @@ WRITE32_HANDLER( sh2_internal_w )
// printf("SH2.%s: TIER write %04x @ %04x\n", sh2->device->tag(), data >> 16, mem_mask>>16);
sh2->m[4] = (sh2->m[4] & ~(ICF|OCFA|OCFB|OVF)) | (old & sh2->m[4] & (ICF|OCFA|OCFB|OVF));
COMBINE_DATA(&sh2->frc);
sh2->frc_remainder = 0;
if((mem_mask & 0x00ffffff) != 0)
sh2_timer_activate(sh2);
sh2_recalc_irq(sh2);
@ -988,6 +1000,7 @@ void sh2_common_init(sh2_state *sh2, legacy_cpu_device *device, device_irq_callb
device->save_pointer(NAME(sh2->m), 0x200/4);
device->save_item(NAME(sh2->nmi_line_state));
device->save_item(NAME(sh2->frc));
device->save_item(NAME(sh2->frc_remainder));
device->save_item(NAME(sh2->ocra));
device->save_item(NAME(sh2->ocrb));
device->save_item(NAME(sh2->icr));

1
src/emu/cpu/sh2/sh2comn.h
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@ -127,6 +127,7 @@ typedef struct
INT8 nmi_line_state;
UINT16 frc;
UINT16 frc_remainder;
UINT16 ocra, ocrb, icr;
UINT64 frc_base;