kernel/acpi: discover local interrupt controllers

1 files changed, 43 insertions, 0 deletions

diff --git a/arch/x86_64/kapi/acpi.cpp b/arch/x86_64/kapi/acpi.cpp
new file mode 100644
index 0000000..9766154
--- /dev/null
+++ b/arch/x86_64/kapi/acpi.cpp
@@ -0,0 +1,43 @@
+#include "kapi/acpi.hpp"
+
+#include "kapi/devices.hpp"
+#include "kapi/memory.hpp"
+
+#include "arch/boot/boot.hpp"
+#include "arch/devices/local_apic.hpp"
+
+#include <kstd/memory>
+
+#include <cstddef>
+#include <cstdint>
+
+namespace kapi::acpi
+{
+
+  auto get_root_pointer() -> kstd::observer_ptr<root_system_description_pointer const>
+  {
+    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);
+    }
+
+    return kstd::make_observer(system_description_pointer);
+  }
+
+  auto create_local_interrupt_controller(std::size_t major, std::size_t minor, std::uint64_t hardware_id,
+                                         memory::physical_address address) -> kstd::unique_ptr<devices::device>
+  {
+    return kstd::make_unique<arch::devices::local_apic>(major, minor, hardware_id, address);
+  }
+
+}  // namespace kapi::acpi
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