From 8d08b3b905d211e989848e1abf3a8ff2535836c8 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 6 Apr 2026 18:13:21 +0200
Subject: kapi: extract more code to the kernel

---
 kernel/kapi/devices/bus.cpp | 65 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 kernel/kapi/devices/bus.cpp

(limited to 'kernel/kapi/devices/bus.cpp')

diff --git a/kernel/kapi/devices/bus.cpp b/kernel/kapi/devices/bus.cpp
new file mode 100644
index 0000000..68874c4
--- /dev/null
+++ b/kernel/kapi/devices/bus.cpp
@@ -0,0 +1,65 @@
+#include "kapi/devices/bus.hpp"
+
+#include "kapi/devices.hpp"
+#include "kapi/system.hpp"
+
+#include <kstd/memory>
+#include <kstd/print>
+#include <kstd/string>
+#include <kstd/vector>
+
+#include <algorithm>
+#include <cstddef>
+#include <utility>
+
+namespace kapi::devices
+{
+  bus::bus(std::size_t major, std::size_t minor, kstd::string const & name)
+      : device(major, minor, name)
+  {}
+
+  auto bus::init() -> bool
+  {
+    if (m_initialized.test_and_set())
+    {
+      return true;
+    }
+
+    if (!probe())
+    {
+      return false;
+    }
+
+    return std::ranges::fold_left(m_devices, true, [&](bool acc, auto & child) -> bool {
+      kstd::println("[OS:DEV] Initializing child device {}@{}", child->name(), name());
+      return child->init() && acc;
+    });
+  }
+
+  auto bus::add_child(kstd::unique_ptr<device> child) -> void
+  {
+    auto observer = m_observers.emplace_back(child.get());
+    m_devices.push_back(std::move(child));
+    kapi::devices::register_device(*observer);
+
+    if (m_initialized.test())
+    {
+      kstd::println("[OS:DEV] Initializing child device {}@{}", observer->name(), name());
+      if (!observer->init())
+      {
+        kapi::system::panic("[OS:DEV] Failed to initialize child device");
+      }
+    }
+  }
+
+  [[nodiscard]] auto bus::children() const -> kstd::vector<kstd::observer_ptr<device>> const &
+  {
+    return m_observers;
+  }
+
+  auto bus::probe() -> bool
+  {
+    return true;
+  }
+
+}  // namespace kapi::devices
\ No newline at end of file
-- 
cgit v1.2.3


From 0e92017837490d3ce806cf511977ada06d11a2a7 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Wed, 8 Apr 2026 15:50:48 +0200
Subject: kapi/bus: fix eager initialization

---
 kernel/kapi/devices/bus.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'kernel/kapi/devices/bus.cpp')

diff --git a/kernel/kapi/devices/bus.cpp b/kernel/kapi/devices/bus.cpp
index 68874c4..66b84d2 100644
--- a/kernel/kapi/devices/bus.cpp
+++ b/kernel/kapi/devices/bus.cpp
@@ -20,20 +20,26 @@ namespace kapi::devices
 
   auto bus::init() -> bool
   {
-    if (m_initialized.test_and_set())
+    if (m_init_was_called.test_and_set())
     {
+      kstd::println(kstd::print_sink::stderr, "[OS:DEV] Bus {}:{}:{} already initialized", name(), major(), minor());
       return true;
     }
 
     if (!probe())
     {
+      kstd::println(kstd::print_sink::stderr, "[OS:DEV] Bus {}:{}:{} probe failed", name(), major(), minor());
       return false;
     }
 
-    return std::ranges::fold_left(m_devices, true, [&](bool acc, auto & child) -> bool {
+    auto child_status = std::ranges::fold_left(m_devices, true, [&](bool acc, auto & child) -> bool {
       kstd::println("[OS:DEV] Initializing child device {}@{}", child->name(), name());
       return child->init() && acc;
     });
+
+    m_initialized.test_and_set();
+
+    return child_status;
   }
 
   auto bus::add_child(kstd::unique_ptr<device> child) -> void
-- 
cgit v1.2.3


From 5a6b6ab376e67b173ef36f831445ccba7e86e038 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Fri, 10 Apr 2026 10:38:51 +0200
Subject: kapi/devices: add parent back-pointer to device

---
 kernel/kapi/devices/bus.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'kernel/kapi/devices/bus.cpp')

diff --git a/kernel/kapi/devices/bus.cpp b/kernel/kapi/devices/bus.cpp
index 66b84d2..5f0dfcd 100644
--- a/kernel/kapi/devices/bus.cpp
+++ b/kernel/kapi/devices/bus.cpp
@@ -45,6 +45,7 @@ namespace kapi::devices
   auto bus::add_child(kstd::unique_ptr<device> child) -> void
   {
     auto observer = m_observers.emplace_back(child.get());
+    child->set_parent(kstd::make_observer(this));
     m_devices.push_back(std::move(child));
     kapi::devices::register_device(*observer);
 
-- 
cgit v1.2.3


From f6f10575f75ac23d06e1d94f7861611503daa7af Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Thu, 23 Apr 2026 14:03:28 +0200
Subject: chore: banish relative includes

---
 kernel/kapi/devices/bus.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'kernel/kapi/devices/bus.cpp')

diff --git a/kernel/kapi/devices/bus.cpp b/kernel/kapi/devices/bus.cpp
index 5f0dfcd..59753f7 100644
--- a/kernel/kapi/devices/bus.cpp
+++ b/kernel/kapi/devices/bus.cpp
@@ -1,7 +1,7 @@
-#include "kapi/devices/bus.hpp"
+#include <kapi/devices/bus.hpp>
 
-#include "kapi/devices.hpp"
-#include "kapi/system.hpp"
+#include <kapi/devices.hpp>
+#include <kapi/system.hpp>
 
 #include <kstd/memory>
 #include <kstd/print>
-- 
cgit v1.2.3