Constructor support

Allow devices/drivers to register themselves via constructors.
Destructors are not needed (can be registered from a constructor)
and "priority" has been renamed and changed to an enum for clarity.

Signed-off-by: Paul Brook <paul@codesourcery.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

module.h

@@ -0,0 +1,35 @@
+/*
+ * QEMU Module Infrastructure
+ *
+ * Copyright IBM, Corp. 2009
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef QEMU_MODULE_H
+#define QEMU_MODULE_H
+
+/* This should not be used directly.  Use block_init etc. instead.  */
+#define module_init(function, type)                                         \
+static void __attribute__((constructor)) do_qemu_init_ ## function(void) {  \
+   register_module_init(function, type);                                    \
+}
+
+typedef enum {
+    MODULE_INIT_BLOCK,
+    MODULE_INIT_DEVICE
+} module_init_type;
+
+#define block_init(function) module_init(function, MODULE_INIT_BLOCK)
+#define device_init(function) module_init(function, MODULE_INIT_DEVICE)
+
+void register_module_init(void (*fn)(void), module_init_type type);
+
+void module_call_init(module_init_type type);
+
+#endif