Partial implementation of DMA controller and GPU stubs

src/pse/gpu.cpp

@@ -0,0 +1,65 @@
+#include "gpu.h"
+#include "YBaseLib/Log.h"
+#include "bus.h"
+Log_SetChannel(GPU);
+
+GPU::GPU() = default;
+
+GPU::~GPU() = default;
+
+bool GPU::Initialize(Bus* bus, DMA* dma)
+{
+  m_bus = bus;
+  m_dma = dma;
+  return true;
+}
+
+void GPU::Reset()
+{
+  SoftReset();
+}
+
+void GPU::SoftReset()
+{
+  m_GPUSTAT.bits = 0x14802000;
+}
+
+u32 GPU::ReadRegister(u32 offset)
+{
+  if (offset == 0x00)
+  {
+    // GPUREAD
+    Log_ErrorPrintf("GPUREAD");
+    return 0;
+  }
+  else if (offset == 0x04)
+  {
+    // GPUSTAT
+    return m_GPUSTAT.bits;
+  }
+
+  Log_ErrorPrintf("Unhandled register read: %02X", offset);
+  return UINT32_C(0xFFFFFFFF);
+}
+
+void GPU::WriteRegister(u32 offset, u32 value)
+{
+  if (offset == 0x00)
+    WriteGP0(value);
+  else if (offset == 0x04)
+    WriteGP1(value);
+  else
+    Log_ErrorPrintf("Unhandled register write: %02X <- %08X", offset, value);
+}
+
+void GPU::WriteGP0(u32 value)
+{
+  const u8 command = Truncate8(value >> 24);
+  Log_ErrorPrintf("Unimplemented GP0 command 0x%02X", command);
+}
+
+void GPU::WriteGP1(u32 value)
+{
+  const u8 command = Truncate8(value >> 24);
+  Log_ErrorPrintf("Unimplemented GP1 command 0x%02X", command);
+}