From c18feddd51d1a1398d1245229c5f889dd40554b3 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 6 Apr 2026 15:54:21 +0200
Subject: x86_64/devices: extract initialization code

---
 arch/x86_64/src/devices/init.cpp | 69 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 arch/x86_64/src/devices/init.cpp

(limited to 'arch/x86_64/src/devices/init.cpp')

diff --git a/arch/x86_64/src/devices/init.cpp b/arch/x86_64/src/devices/init.cpp
new file mode 100644
index 0000000..1099ad6
--- /dev/null
+++ b/arch/x86_64/src/devices/init.cpp
@@ -0,0 +1,69 @@
+#include "arch/devices/init.hpp"
+
+#include "kapi/acpi.hpp"
+#include "kapi/boot.hpp"
+#include "kapi/devices.hpp"
+
+#include "arch/boot/boot.hpp"
+#include "arch/bus/isa.hpp"
+#include "arch/devices/legacy_pit.hpp"
+
+#include <kstd/memory>
+#include <kstd/print>
+
+#include <cstdint>
+#include <utility>
+
+namespace arch::devices
+{
+
+  namespace
+  {
+    constexpr auto pit_frequency_in_hz = std::uint32_t{100u};
+  }
+
+  auto init_acpi_devices() -> void
+  {
+    auto const & mbi = kapi::boot::bootstrap_information.mbi;
+    auto system_description_pointer = static_cast<kapi::acpi::root_system_description_pointer const *>(nullptr);
+
+    if (auto const & xsdp = mbi->maybe_acpi_xsdp())
+    {
+      auto data = xsdp->pointer().data();
+      system_description_pointer = reinterpret_cast<kapi::acpi::root_system_description_pointer const *>(data);
+    }
+    else if (auto const & rsdp = mbi->maybe_acpi_rsdp())
+    {
+      auto data = rsdp->pointer().data();
+      system_description_pointer = reinterpret_cast<kapi::acpi::root_system_description_pointer const *>(data);
+    }
+
+    if (system_description_pointer)
+    {
+      if (!kapi::acpi::init(*system_description_pointer))
+      {
+        kstd::println(kstd::print_sink::stderr, "[x86_64:DEV] ACPI initialization failed. No tables loaded.");
+      }
+    }
+    else
+    {
+      kstd::println(kstd::print_sink::stderr, "[x86_64:DEV] No ACPI RSDP found. Most devices will not be available.");
+    }
+  }
+
+  auto init_legacy_devices() -> void
+  {
+    kstd::println("[x86_64:DEV] Initializing ISA bus...");
+
+    auto isa_major_number = kapi::devices::allocate_major_number();
+    auto isa_bus = kstd::make_unique<arch::bus::isa>(isa_major_number);
+
+    auto pit_major_number = kapi::devices::allocate_major_number();
+    auto pit = kstd::make_unique<arch::devices::legacy_pit>(pit_major_number, pit_frequency_in_hz);
+    isa_bus->add_child(std::move(pit));
+
+    auto & root_bus = kapi::devices::get_root_bus();
+    root_bus.add_child(std::move(isa_bus));
+  }
+
+}  // namespace arch::devices
-- 
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