From dd8dfa3e674d05927e9ed4b7efcb634a634bfdcc Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Fri, 10 Apr 2026 10:30:32 +0200
Subject: kapi: move CPU to kapi

---
 kapi/include/kapi/cpu.hpp         | 16 +---------------
 kapi/include/kapi/devices.hpp     |  1 +
 kapi/include/kapi/devices/cpu.hpp | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 15 deletions(-)
 create mode 100644 kapi/include/kapi/devices/cpu.hpp

(limited to 'kapi')

diff --git a/kapi/include/kapi/cpu.hpp b/kapi/include/kapi/cpu.hpp
index c643cd7..e736be1 100644
--- a/kapi/include/kapi/cpu.hpp
+++ b/kapi/include/kapi/cpu.hpp
@@ -1,13 +1,11 @@
 #ifndef TEACHOS_KAPI_CPU_HPP
 #define TEACHOS_KAPI_CPU_HPP
 
-#include "kapi/devices.hpp"
 #include "kapi/memory.hpp"
 
 #include <kstd/format>
 #include <kstd/memory>
 
-#include <cstddef>
 #include <cstdint>
 
 namespace kapi::cpu
@@ -75,17 +73,6 @@ namespace kapi::cpu
   //! @return Whether the exception was handled.
   [[nodiscard]] auto dispatch(exception const & context) -> bool;
 
-  //! A hook that is called when the platform detects a CPU core during topology discovery.
-  //!
-  //! @param bus The bus the CPU was detected on.
-  //! @param major The major number of the CPU device.
-  //! @param minor The minor number of the CPU device.
-  //! @param hardware_id The hardware specific ID of the CPU core.
-  //! @param is_bsp Whether the reported CPU is the the bootstrap processor.
-  //! @param core_interrupt_controller The local interrupt controller of this CPU core.
-  auto core_detected(kapi::devices::bus & bus, std::size_t major, std::size_t minor, std::uint64_t hardware_id,
-                     bool is_bsp, kstd::unique_ptr<devices::device> core_interrupt_controller) -> bool;
-
   //! @}
 
   //! @addtogroup kapi-cpu-platform-defined
@@ -104,9 +91,8 @@ namespace kapi::cpu
 
   //! Discover the CPU topology of the platform and attach it to the given CPU bus.
   //!
-  //! @param bus The bus to attach the CPU topology to.
   //! @return true iff. the CPU topology was discovered successfully, false otherwise.
-  auto discover_topology(kapi::devices::bus & bus) -> bool;
+  auto discover_topology() -> bool;
 
   //! @}
 
diff --git a/kapi/include/kapi/devices.hpp b/kapi/include/kapi/devices.hpp
index c26efb9..ec154a5 100644
--- a/kapi/include/kapi/devices.hpp
+++ b/kapi/include/kapi/devices.hpp
@@ -2,6 +2,7 @@
 #define TEACHOS_KAPI_DEVICES_HPP
 
 #include "kapi/devices/bus.hpp"      // IWYU pragma: export
+#include "kapi/devices/cpu.hpp"      // IWYU pragma: export
 #include "kapi/devices/device.hpp"   // IWYU pragma: export
 #include "kapi/devices/manager.hpp"  // IWYU pragma: export
 
diff --git a/kapi/include/kapi/devices/cpu.hpp b/kapi/include/kapi/devices/cpu.hpp
new file mode 100644
index 0000000..00766b5
--- /dev/null
+++ b/kapi/include/kapi/devices/cpu.hpp
@@ -0,0 +1,37 @@
+#ifndef TEACHOS_KAPI_DEVICES_CPU_HPP
+#define TEACHOS_KAPI_DEVICES_CPU_HPP
+
+#include "kapi/devices/bus.hpp"
+
+#include <cstddef>
+#include <cstdint>
+
+namespace kapi::devices
+{
+
+  //! A virtual CPU bus to host all CPUs in the system.
+  struct cpu final : kapi::devices::bus
+  {
+    //! A virtual CPU Core to host all core local devices.
+    struct core final : kapi::devices::bus
+    {
+      explicit core(std::size_t major_number, std::size_t minor_number, std::uint64_t hardware_id, bool is_bsp);
+
+      [[nodiscard]] auto hardware_id() const -> std::uint64_t;
+      [[nodiscard]] auto is_bsp() const -> bool;
+
+    private:
+      std::uint64_t m_hardware_id;
+      bool m_is_bsp;
+    };
+
+    //! Create a new CPU with the given major and minor numbers.
+    //!
+    //! @param major The major number of this CPU
+    //! @param minor The minor number of this CPU, identifying the physical CPU
+    cpu(std::size_t major, std::size_t minor);
+  };
+
+}  // namespace kapi::devices
+
+#endif
\ No newline at end of file
-- 
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