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.

2 files changed, 67 insertions, 0 deletions

diff --git a/arch/x86_64/src/devices/init.cpp b/arch/x86_64/src/devices/init.cpp
new file mode 100644
index 0000000..6cba986
--- /dev/null
+++ b/arch/x86_64/src/devices/init.cpp
@@ -0,0 +1,39 @@
+#include "arch/devices/init.hpp"
+
+#include "kapi/devices.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 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
diff --git a/arch/x86_64/src/devices/local_apic.cpp b/arch/x86_64/src/devices/local_apic.cpp
new file mode 100644
index 0000000..beb75ef
--- /dev/null
+++ b/arch/x86_64/src/devices/local_apic.cpp
@@ -0,0 +1,28 @@
+#include "arch/devices/local_apic.hpp"
+
+#include "kapi/devices.hpp"
+#include "kapi/memory.hpp"
+
+#include <kstd/print>
+
+#include <cstddef>
+#include <cstdint>
+
+namespace arch::devices
+{
+
+  local_apic::local_apic(std::size_t major, std::size_t minor, std::uint64_t hardware_id,
+                         kapi::memory::physical_address base)
+      : kapi::devices::device{major, minor, "lapic"}
+      , m_hardware_id{hardware_id}
+      , m_base{base}
+  {}
+
+  auto local_apic::init() -> bool
+  {
+    kstd::println("[x86_64:DEV] Initializing local APIC on core {}", m_hardware_id);
+
+    return true;
+  }
+
+}  // namespace arch::devices
\ No newline at end of file