From d0c532af74d8d486d734904fd330d5dae7f49754 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Thu, 2 Apr 2026 13:36:01 +0200
Subject: kapi: add basic device subsystem

---
 kernel/src/devices/root_bus.cpp | 55 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 kernel/src/devices/root_bus.cpp

(limited to 'kernel/src/devices')

diff --git a/kernel/src/devices/root_bus.cpp b/kernel/src/devices/root_bus.cpp
new file mode 100644
index 0000000..a7f3c1a
--- /dev/null
+++ b/kernel/src/devices/root_bus.cpp
@@ -0,0 +1,55 @@
+#include "kernel/devices/root_bus.hpp"
+
+#include "kapi/devices.hpp"
+#include "kapi/devices/bus.hpp"
+#include "kapi/devices/device.hpp"
+#include "kapi/system.hpp"
+
+#include <kstd/memory>
+#include <kstd/print>
+#include <kstd/vector>
+
+#include <algorithm>
+#include <utility>
+
+namespace kernel::devices
+{
+
+  root_bus::root_bus()
+      : kapi::devices::bus{kapi::devices::allocate_major_number(), 0, "system"}
+  {}
+
+  auto root_bus::add_child(kstd::unique_ptr<device> child) -> void
+  {
+    auto observer = m_observers.emplace_back(child.get());
+    m_children.push_back(std::move(child));
+
+    if (m_initialized)
+    {
+      kstd::println("Initializing child device '{}'", observer->name());
+      if (!observer->init())
+      {
+        kapi::system::panic("[kernel:devices] Failed to initialize child device");
+      }
+    }
+  }
+
+  auto root_bus::children() const -> kstd::vector<kstd::observer_ptr<device>> const &
+  {
+    return m_observers;
+  }
+
+  auto root_bus::init() -> bool
+  {
+    if (m_initialized)
+    {
+      kapi::system::panic("[kernel:devices] Root bus already initialized!");
+    }
+
+    return std::ranges::fold_left(m_children, true, [](bool acc, auto & child) -> bool {
+      kstd::println("[kernel:devices] Initializing child device '{}'", child->name());
+      return acc && child->init();
+    });
+  }
+
+}  // namespace kernel::devices
\ No newline at end of file
-- 
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