ditch multi-system idea

src/n64/core/mmio/SI.hpp

@@ -0,0 +1,32 @@
+#pragma once
+#include <common.hpp>
+#include <n64/core/mmio/Interrupt.hpp>
+#include <n64/core/mmio/MI.hpp>
+#include <n64/core/mmio/PIF.hpp>
+
+namespace n64 {
+
+union SIStatus {
+  u32 raw{};
+  struct {
+    unsigned dmaBusy:1;
+    unsigned ioBusy:1;
+    unsigned reserved:1;
+    unsigned dmaErr:1;
+    unsigned:8;
+    unsigned intr:1;
+  };
+};
+
+struct Mem;
+
+struct SI {
+  SI() = default;
+  SIStatus status{};
+  u32 dramAddr{};
+  Controller controller{};
+
+  auto Read(MI&, u32) const -> u32;
+  void Write(Mem&, Registers&, u32, u32);
+};
+}