Cross-platformizing MMIO stuff.

MSVC build likely needs some fixes.

src/xenia/cpu/mmio_handler.h

@@ -0,0 +1,67 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_CPU_MMIO_HANDLER_H_
+#define XENIA_CPU_MMIO_HANDLER_H_
+
+#include <memory>
+#include <vector>
+
+namespace xe {
+namespace cpu {
+
+typedef uint64_t (*MMIOReadCallback)(void* context, uint64_t addr);
+typedef void (*MMIOWriteCallback)(void* context, uint64_t addr, uint64_t value);
+
+// NOTE: only one can exist at a time!
+class MMIOHandler {
+ public:
+  virtual ~MMIOHandler();
+
+  static std::unique_ptr<MMIOHandler> Install();
+  static MMIOHandler* global_handler() { return global_handler_; }
+
+  bool RegisterRange(uint64_t address, uint64_t mask, uint64_t size,
+                     void* context, MMIOReadCallback read_callback,
+                     MMIOWriteCallback write_callback);
+
+  bool CheckLoad(uint64_t address, uint64_t* out_value);
+  bool CheckStore(uint64_t address, uint64_t value);
+
+ public:
+  bool HandleAccessFault(void* thread_state, uint64_t fault_address);
+
+ protected:
+  MMIOHandler() = default;
+
+  virtual bool Initialize() = 0;
+  virtual void Uninstall() = 0;
+
+  virtual uint64_t GetThreadStateRip(void* thread_state_ptr) = 0;
+  virtual void SetThreadStateRip(void* thread_state_ptr, uint64_t rip) = 0;
+  virtual uint64_t* GetThreadStateRegPtr(void* thread_state_ptr,
+                                         int32_t be_reg_index) = 0;
+
+  struct MMIORange {
+    uint64_t address;
+    uint64_t mask;
+    uint64_t size;
+    void* context;
+    MMIOReadCallback read;
+    MMIOWriteCallback write;
+  };
+  std::vector<MMIORange> mapped_ranges_;
+
+  static MMIOHandler* global_handler_;
+};
+
+}  // namespace cpu
+}  // namespace xe
+
+#endif  // XENIA_CPU_MMIO_HANDLER_H_