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writing back dirty cache lines should be done in one burst if both halves are dirty

This commit is contained in:
Jaklyy 2024-10-25 23:58:18 -04:00
parent e783e778eb
commit e1f22bd511
1 changed files with 11 additions and 3 deletions
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12
src/CP15.cpp
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@ -1091,12 +1091,20 @@ void ARMv5::DCacheClearByASetAndWay(const u8 cacheSet, const u8 cacheLine)
u8 cycless = NDS.ARM9MemTimings[tag>>14][3]; u8 cycless = NDS.ARM9MemTimings[tag>>14][3];
if ((tag >> 24) == 0x02) cycless = (cycless - 2) | 0x80; if ((tag >> 24) == 0x02) cycless = (cycless - 2) | 0x80;
if (DCacheTags[index] & CACHE_FLAG_DIRTY_LOWERHALF)
{
cyclesn = cycless; // write back is done in one burst if both halves are dirty
}
else
{
WriteBufferWrite(tag+0x10, 3, 0); WriteBufferWrite(tag+0x10, 3, 0);
NDS.ARM9Timestamp += 1;
}
WriteBufferWrite(ptr[4], 2, cyclesn, tag+0x10); WriteBufferWrite(ptr[4], 2, cyclesn, tag+0x10);
WriteBufferWrite(ptr[5], 2, cycless, tag+0x14); WriteBufferWrite(ptr[5], 2, cycless, tag+0x14);
WriteBufferWrite(ptr[6], 2, cycless, tag+0x18); WriteBufferWrite(ptr[6], 2, cycless, tag+0x18);
WriteBufferWrite(ptr[7], 2, cycless, tag+0x1C); WriteBufferWrite(ptr[7], 2, cycless, tag+0x1C);
NDS.ARM9Timestamp += 5; //DataCycles += 5; CHECKME: does this function like a write does but with mcr? NDS.ARM9Timestamp += 4;
} }
DCacheTags[index] &= ~(CACHE_FLAG_DIRTY_LOWERHALF | CACHE_FLAG_DIRTY_UPPERHALF); DCacheTags[index] &= ~(CACHE_FLAG_DIRTY_LOWERHALF | CACHE_FLAG_DIRTY_UPPERHALF);
#endif #endif
@ -2274,7 +2282,7 @@ bool ARMv5::DataRead32S(u32 addr, u32* val)
if (NDS.ARM9Timestamp < time) NDS.ARM9Timestamp = time; if (NDS.ARM9Timestamp < time) NDS.ARM9Timestamp = time;
} }
if (PU_Map[addr>>12] & 0x30) if (PU_Map[addr>>12] & 0x30) // checkme
WriteBufferDrain(); WriteBufferDrain();
NDS.ARM9Timestamp += DataCycles; NDS.ARM9Timestamp += DataCycles;