[Usbd] more stubs

src/SharpEmu.Libs/Usbd/UsbdExports.cs

@@ -9,6 +9,58 @@ public static class UsbdExports
 {
     private const int SceUsbdErrorInvalidParam = unchecked((int)0x80240002);
 
+    [SysAbiExport(
+        Nid = "TOhg7P6kTH4",
+        ExportName = "sceUsbdInit",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceUsbd")]
+    public static int UsbdInit(CpuContext ctx)
+    {
+        // SharpEmu does not expose host USB devices yet. Initializing an empty
+        // backend still succeeds, allowing games to probe optional peripherals
+        // and fall back to their normal controller path.
+        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+    }
+
+    [SysAbiExport(
+        Nid = "Fq6+0Fm55xU",
+        ExportName = "sceUsbdExit",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceUsbd")]
+    public static int UsbdExit(CpuContext ctx)
+    {
+        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+    }
+
+    [SysAbiExport(
+        Nid = "8qB9Ar4P5nc",
+        ExportName = "sceUsbdGetDeviceList",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceUsbd")]
+    public static int UsbdGetDeviceList(CpuContext ctx)
+    {
+        var listAddress = ctx[CpuRegister.Rdi];
+        if (listAddress == 0 || !ctx.TryWriteUInt64(listAddress, 0))
+        {
+            return ctx.SetReturn(SceUsbdErrorInvalidParam);
+        }
+
+        // libusb_get_device_list returns a non-negative device count. Report an
+        // empty list until a USB backend exists so wheel probing remains
+        // optional instead of receiving an unresolved-import error sentinel.
+        return ctx.SetReturn(0);
+    }
+
+    [SysAbiExport(
+        Nid = "EQ6SCLMqzkM",
+        ExportName = "sceUsbdFreeDeviceList",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceUsbd")]
+    public static int UsbdFreeDeviceList(CpuContext ctx)
+    {
+        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+    }
+
     [SysAbiExport(
         Nid = "+wU6CGuZcWk",
         ExportName = "sceUsbdHandleEventsTimeout",