refactor: promote new architecture to repository root

Archive the deprecated implementation under lume-legacy, make the new kernel the default root-level build, and update repository entry points without changing kernel behavior.

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/base/bus.cc b/drivers/base/bus.cc
new file mode 100644
index 0000000..975f676
--- /dev/null
+++ b/drivers/base/bus.cc
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2026 Richard Qin */
+
+/*
+ * drivers/base/bus.cc — bus_type registration.
+ *
+ * Mirrors Linux drivers/base/bus.c.  Trivial in this iteration:
+ * initialize the device/driver lists and the per-bus spinlock.
+ *
+ * Reference: docs/specs/storage_stack.md §4.3
+ */
+
+#include <lume/device.h>
+#include <lume/klog.h>
+#include <lume/kprintf.h>
+#include <lume/errno.h>
+
+int bus_register(bus_type* bus)
+{
+    if (bus == nullptr || bus->name == nullptr) {
+        return -EINVAL;
+    }
+    if (bus->registered) {
+        return 0;
+    }
+    bus->devices.init();
+    bus->drivers.init();
+    bus->lock.init(bus->name);
+    bus->registered = true;
+    kprintf("[bus] '%s' registered\n", bus->name);
+    return 0;
+}