Merge branch 'fmorgner/develop-BA-FS26/apci' into develop-BA-FS26

This patchset introduces basic support for ACPI. Currently, the only
user of that support is the CPU discovery subsystem. It uses the
processed ACPI information to initialize CPU core devices and their
associated local APICs.

1 files changed, 65 insertions, 0 deletions

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