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redo cache streaming disable implementation

This commit is contained in:
Jaklyy 2024-10-26 11:20:55 -04:00
parent e1f22bd511
commit ba904b4d81
1 changed files with 70 additions and 63 deletions
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69
src/CP15.cpp
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@ -410,17 +410,6 @@ u32 ARMv5::ICacheLookup(const u32 addr)
#endif
{
u32 *cacheLine = (u32 *)&ICache[(id+set) << ICACHE_LINELENGTH_LOG2];
if (CP15BISTTestStateRegister & CP15_BIST_TR_DISABLE_ICACHE_STREAMING) [[unlikely]]
{
// Disabled ICACHE Streaming:
// retreive the data from memory, even if the data was cached
// See arm946e-s Rev 1 technical manual, 2.3.15 "Register 15, test State Register")
WriteBufferDrain();
CodeCycles = NDS.ARM9MemTimings[tag >> 14][2];
{
return NDS.ARM9Read32(addr & ~3);
}
}
if (ICacheFillPtr == 7) NDS.ARM9Timestamp++;
else
@ -506,10 +495,7 @@ u32 ARMv5::ICacheLookup(const u32 addr)
ICacheTags[line] = tag | (line & (ICACHE_SETS-1)) | CACHE_FLAG_VALID;
// ouch :/
//printf("cache miss %08X: %d/%d\n", addr, NDS::ARM9MemTimings[addr >> 14][2], NDS::ARM9MemTimings[addr >> 14][3]);
// first N32 remaining S32
// timing logic
NDS.ARM9Timestamp = NDS.ARM9Timestamp + ((1<<NDS.ARM9ClockShift)-1) & ~((1<<NDS.ARM9ClockShift)-1);
if ((addr >> 24) == 0x02)
@ -519,6 +505,15 @@ u32 ARMv5::ICacheLookup(const u32 addr)
else if (NDS.ARM9Regions[addr>>14] == DataRegion && Store) NDS.ARM9Timestamp += (1<<NDS.ARM9ClockShift);
Store = false;
// Disabled ICACHE Streaming:
// Wait until the entire cache line is filled before continuing with execution
if (CP15BISTTestStateRegister & CP15_BIST_TR_DISABLE_ICACHE_STREAMING) [[unlikely]]
{
NDS.ARM9Timestamp += MemTimings[tag >> 14][1] + ((MemTimings[tag >> 14][2] + 1) * ((DCACHE_LINELENGTH / 4) - 1));
if (NDS.ARM9Timestamp < TimestampActual) NDS.ARM9Timestamp = TimestampActual;
}
else // ICache Streaming logic
{
u8 ns = MemTimings[addr>>14][1];
u8 seq = MemTimings[addr>>14][2] + 1;
@ -535,6 +530,7 @@ u32 ARMv5::ICacheLookup(const u32 addr)
ICacheFillTimes[i] = cycles;
}
if ((addr >> 24) == 0x02) MainRAMTimestamp = ICacheFillTimes[6];
}
DataRegion = Mem9_Null;
return ptr[(addr & (ICACHE_LINELENGTH-1)) >> 2];
@ -626,15 +622,6 @@ u32 ARMv5::DCacheLookup(const u32 addr)
#endif
{
u32 *cacheLine = (u32 *)&DCache[(id+set) << DCACHE_LINELENGTH_LOG2];
if (CP15BISTTestStateRegister & CP15_BIST_TR_DISABLE_DCACHE_STREAMING) [[unlikely]]
{
// Disabled DCACHE Streaming:
// retreive the data from memory, even if the data was cached
// See arm946e-s Rev 1 technical manual, 2.3.15 "Register 15, test State Register")
WriteBufferDrain();
DataCycles = NDS.ARM9MemTimings[tag >> 14][2];
return BusRead32(addr & ~3);
}
NDS.ARM9Timestamp += DataCycles;
DataCycles = 0;
@ -702,6 +689,8 @@ u32 ARMv5::DCacheLookup(const u32 addr)
u32* ptr = (u32 *)&DCache[line << DCACHE_LINELENGTH_LOG2];
NDS.ARM9Timestamp += DataCycles;
WriteBufferDrain(); // checkme?
//DataCycles = 0;
#if !DISABLE_CACHEWRITEBACK
// Before we fill the cacheline, we need to write back dirty content
@ -709,8 +698,6 @@ u32 ARMv5::DCacheLookup(const u32 addr)
DCacheClearByASetAndWay(line & (DCACHE_SETS-1), line >> DCACHE_SETS_LOG2);
#endif
WriteBufferDrain(); // checkme?
for (int i = 0; i < DCACHE_LINELENGTH; i+=sizeof(u32))
{
ptr[i >> 2] = BusRead32(tag+i);
@ -718,6 +705,27 @@ u32 ARMv5::DCacheLookup(const u32 addr)
DCacheTags[line] = tag | (line & (DCACHE_SETS-1)) | CACHE_FLAG_VALID;
// timing logic
// Disabled DCACHE Streaming:
// Wait until the entire cache line is filled before continuing with execution
if (CP15BISTTestStateRegister & CP15_BIST_TR_DISABLE_DCACHE_STREAMING) [[unlikely]]
{
NDS.ARM9Timestamp = NDS.ARM9Timestamp + ((1<<NDS.ARM9ClockShift)-1) & ~((1<<NDS.ARM9ClockShift)-1);
NDS.ARM9Timestamp += MemTimings[tag >> 14][1] + ((MemTimings[tag >> 14][2] + 1) * ((DCACHE_LINELENGTH / 4) - 2));
DataCycles = MemTimings[tag>>14][2] + 1;
if ((addr >> 24) == 0x02)
{
if (NDS.ARM9Timestamp < MainRAMTimestamp) NDS.ARM9Timestamp = MainRAMTimestamp;
MainRAMTimestamp = NDS.ARM9Timestamp + DataCycles;
DataRegion = Mem9_MainRAM;
}
else DataRegion = NDS.ARM9Regions[addr>>14];
}
else // DCache Streaming logic
{
if ((addr >> 24) == 0x02)
{
if (NDS.ARM9Timestamp < MainRAMTimestamp) NDS.ARM9Timestamp = MainRAMTimestamp;
@ -744,10 +752,7 @@ u32 ARMv5::DCacheLookup(const u32 addr)
if ((addr >> 24) == 0x02) MainRAMTimestamp = DCacheFillTimes[6];
DataRegion = NDS.ARM9Regions[addr>>14];
//NDS.ARM9Timestamp += ((NDS.ARM9MemTimings[tag >> 14][2] + (NDS.ARM9MemTimings[tag >> 14][3] * ((DCACHE_LINELENGTH / 4) - 2)) - 1) << NDS.ARM9ClockShift) + 1;
//DataCycles = NDS.ARM9MemTimings[tag>>14][3] << NDS.ARM9ClockShift;
}
return ptr[(addr & (DCACHE_LINELENGTH-1)) >> 2];
}
@ -1124,6 +1129,8 @@ inline bool ARMv5::WriteBufferHandle()
bool mainram = (WBCurCycles >= 0x80);
u64 ts;
u64 mrts = (MainRAMTimestamp + ((1<<NDS.ARM9ClockShift)-1)) >> NDS.ARM9ClockShift;
if (WBMainRAMDelay < mrts) WBMainRAMDelay = mrts;
if (mainram) ts = std::max(WBTimestamp, WBMainRAMDelay) + (WBCurCycles & 0x7F);
else ts = WBTimestamp + (WBCurCycles & 0x7F);
@ -1206,7 +1213,7 @@ void ARMv5::WriteBufferWrite(u32 val, u8 flag, u8 cycles, u32 addr)
else if (WBWritePointer == 16) // indicates empty write buffer
{
WBWritePointer = 0;
WBTimestamp = (((NDS.ARM9Timestamp + DataCycles + 1) + ((1<<NDS.ARM9ClockShift)-1)) & ~((1<<NDS.ARM9ClockShift)-1)) >> NDS.ARM9ClockShift;
WBTimestamp = ((NDS.ARM9Timestamp + DataCycles + 1) + ((1<<NDS.ARM9ClockShift)-1)) >> NDS.ARM9ClockShift;
}
WriteBufferFifo[WBFillPointer] = val | (u64)flag << 62;