[XAM] Improvement rollup. Content, enumerators...

- [Kernel] Create guest object for XEnumerator.
- [XAM] Split content data into host/guest variants.
- [XAM] Correct message return type from RESULT to HRESULT.
- [XAM] Add a new dummy content device for ODD.
- [XAM] Implement XamContentAggregateCreateEnumerator.
- [XAM] Implement XamGetPrivateEnumStructureFromHandle.
- [XAM] Implement XMsgCompleteIORequest (sketchy).
- [XAM] Implement XamGetOverlappedResult (sketchy).
- [XAM] Implement XamTaskSchedule (sketchy).

src/xenia/kernel/xam/xam_task.cc

@@ -0,0 +1,66 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2020 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/base/logging.h"
+#include "xenia/base/string_util.h"
+#include "xenia/cpu/processor.h"
+#include "xenia/kernel/kernel_state.h"
+#include "xenia/kernel/util/shim_utils.h"
+#include "xenia/kernel/xam/xam_module.h"
+#include "xenia/kernel/xam/xam_private.h"
+#include "xenia/kernel/xthread.h"
+#include "xenia/xbox.h"
+
+#if XE_PLATFORM_WIN32
+#include "xenia/base/platform_win.h"
+#endif
+
+#include "third_party/fmt/include/fmt/format.h"
+
+namespace xe {
+namespace kernel {
+namespace xam {
+
+struct XTASK_MESSAGE {
+  be<uint32_t> unknown_00;
+  be<uint32_t> unknown_04;
+  be<uint32_t> unknown_08;
+  be<uint32_t> callback_arg_ptr;
+  be<uint32_t> event_handle;
+  be<uint32_t> unknown_14;
+  be<uint32_t> task_handle;
+};
+static_assert_size(XTASK_MESSAGE, 0x1C);
+
+dword_result_t XamTaskSchedule(lpvoid_t callback,
+                               pointer_t<XTASK_MESSAGE> message,
+                               dword_t unknown, lpdword_t handle_ptr) {
+  assert_zero(unknown);
+
+  // TODO(gibbed): figure out what this is for
+  *handle_ptr = 12345;
+
+  XELOGW("!! Executing scheduled task ({:08X}) synchronously, PROBABLY BAD !! ",
+         callback.guest_address());
+
+  // TODO(gibbed): this is supposed to be async... let's cheat.
+  auto thread_state = XThread::GetCurrentThread()->thread_state();
+  uint64_t args[] = {message.guest_address()};
+  auto result = kernel_state()->processor()->Execute(thread_state, callback,
+                                                     args, xe::countof(args));
+  return X_STATUS_SUCCESS;
+}
+DECLARE_XAM_EXPORT2(XamTaskSchedule, kNone, kImplemented, kSketchy);
+
+void RegisterTaskExports(xe::cpu::ExportResolver* export_resolver,
+                         KernelState* kernel_state) {}
+
+}  // namespace xam
+}  // namespace kernel
+}  // namespace xe