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sh2: fix fractional FRC increments [R. Belmont]

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This commit is contained in:
R. Belmont 2011-08-13 21:22:40 +00:00
parent d10d6f0851
commit 2f107b175f
1 changed files with 15 additions and 4 deletions
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19
src/emu/cpu/sh2/sh2comn.c
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@ -62,10 +62,15 @@ static void sh2_timer_resync(sh2_state *sh2)
{
int divider = div_tab[(sh2->m[5] >> 8) & 3];
UINT64 cur_time = sh2->device->total_cycles();
UINT64 add = (cur_time - sh2->frc_base) >> divider;
if(divider)
sh2->frc += (cur_time - sh2->frc_base) >> divider;
sh2->frc_base = cur_time;
if (add > 0)
{
if(divider)
sh2->frc += add;
sh2->frc_base = cur_time;
}
}
static void sh2_timer_activate(sh2_state *sh2)
@ -524,7 +529,9 @@ WRITE32_HANDLER( sh2_internal_w )
// Timers
case 0x04: // TIER, FTCSR, FRC
if((mem_mask & 0x00ffffff) != 0)
{
sh2_timer_resync(sh2);
}
// 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);
@ -686,13 +693,17 @@ READ32_HANDLER( sh2_internal_r )
#ifdef USE_SH2DRC
offset &= 0x7f;
#endif
// logerror("sh2_internal_r: Read %08x (%x) @ %08x\n", 0xfffffe00+offset*4, offset, mem_mask);
// logerror("sh2_internal_r: Read %08x (%x) @ %08x\n", 0xfffffe00+offset*4, offset, mem_mask);
switch( offset )
{
case 0x04: // TIER, FTCSR, FRC
if ( mem_mask == 0x00ff0000 )
{
if ( sh2->ftcsr_read_callback != NULL )
{
sh2->ftcsr_read_callback( (sh2->m[4] & 0xffff0000) | sh2->frc );
}
}
sh2_timer_resync(sh2);
return (sh2->m[4] & 0xffff0000) | sh2->frc;
case 0x05: // OCRx, TCR, TOCR