prep cache impl

src/backend/core/BaseCPU.hpp

@@ -4,9 +4,30 @@
 #include <Disassembler.hpp>
 
 namespace n64 {
+struct alignas(32) InstructionCache {
+    bool valid;
+    u32 data[8];
+    u32 ptag;
+
+  private:
+    int GetLineIndex(u64 vaddr) { return (vaddr >> 5) & 0x1FF; }
+    u32 GetLineStart(u64 paddr) { return paddr & ~0x1F; }
+};
+
+struct alignas(32) DataCache {
+    bool valid, dirty;
+    u8 data[16];
+    u32 ptag;
+    int index;
+
+  private:
+    int GetLineIndex(u64 vaddr) { return (vaddr >> 4) & 0x1FF; }
+    u32 GetLineStart(u64 paddr) { return paddr & ~0xF; }
+};
+
 struct BaseCPU {
-  virtual ~BaseCPU() = default;
-  virtual u32 Step() = 0;
-  virtual void Reset() = 0;
+    virtual ~BaseCPU() = default;
+    virtual u32 Step() = 0;
+    virtual void Reset() = 0;
 };
 } // namespace n64