Low Ram has also a column/row mechanism - Impact on row change is a b…

…it longer
FCare · Dec 1, 2024 · 8407d66 · 8407d66
1 parent dcf2170
commit 8407d66
Showing 1 changed file with 33 additions and 1 deletion.
diff --git a/yabause/src/sys/memory/src/memory.c b/yabause/src/sys/memory/src/memory.c
@@ -314,7 +314,7 @@ static void FASTCALL UnhandledMemoryWriteLong(SH2_struct *context, UNUSED u8* me
 
 //////////////////////////////////////////////////////////////////////////////
 
-u32 lastHWRamBankCol = 0;
+static u32 lastHWRamBankCol = 0;
 
 static u8 FASTCALL HighWramMemoryReadByte(SH2_struct *context, u8* mem, u32 addr)
 {
@@ -388,43 +388,75 @@ static void FASTCALL HighWramMemoryWriteLong(SH2_struct *context, u8* mem, u32 a
 
 //////////////////////////////////////////////////////////////////////////////
 
+static u32 lastLWRamBankCol = 0;
+
 static u8 FASTCALL LowWramMemoryReadByte(SH2_struct *context, UNUSED u8* memory, u32 addr)
 {
+    int rowBank = ((addr>>11)&0x1FF);
+    if (rowBank != lastLWRamBankCol) {
+     lastLWRamBankCol = rowBank;
+     if ((context) && (!context->cacheOn)) context->cycles += 4;
+    }
    return T2ReadByte(memory, addr & 0xFFFFF);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 static u16 FASTCALL LowWramMemoryReadWord(SH2_struct *context, UNUSED u8* memory, u32 addr)
 {
+  int rowBank = ((addr>>11)&0x1FF);
+  if (rowBank != lastLWRamBankCol) {
+   lastLWRamBankCol = rowBank;
+   if ((context) && (!context->cacheOn)) context->cycles += 4;
+  }
    return T2ReadWord(memory, addr & 0xFFFFF);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 static u32 FASTCALL LowWramMemoryReadLong(SH2_struct *context, UNUSED u8* memory, u32 addr)
 {
+  int rowBank = ((addr>>11)&0x1FF);
+  if (rowBank != lastLWRamBankCol) {
+   lastLWRamBankCol = rowBank;
+   if ((context) && (!context->cacheOn)) context->cycles += 4;
+  }
    return T2ReadLong(memory, addr & 0xFFFFF);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 static void FASTCALL LowWramMemoryWriteByte(SH2_struct *context, UNUSED u8* memory, u32 addr, u8 val)
 {
+  int rowBank = ((addr>>11)&0x1FF);
+  if (rowBank != lastLWRamBankCol) {
+   lastLWRamBankCol = rowBank;
+   if (context) context->cycles += 4;
+  }
    T2WriteByte(memory, addr & 0xFFFFF, val);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 static void FASTCALL LowWramMemoryWriteWord(SH2_struct *context, UNUSED u8* memory, u32 addr, u16 val)
 {
+  int rowBank = ((addr>>11)&0x1FF);
+  if (rowBank != lastLWRamBankCol) {
+   lastLWRamBankCol = rowBank;
+   if (context) context->cycles += 4;
+  }
    T2WriteWord(memory, addr & 0xFFFFF, val);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 static void FASTCALL LowWramMemoryWriteLong(SH2_struct *context, UNUSED u8* memory, u32 addr, u32 val)
 {
+  int rowBank = ((addr>>11)&0x1FF);
+  if (rowBank != lastLWRamBankCol) {
+   lastLWRamBankCol = rowBank;
+   if (context) context->cycles += 4;
+  }
    T2WriteLong(memory, addr & 0xFFFFF, val);
 }