kernel/cpu: introduce core index number

5 files changed, 28 insertions, 8 deletions

diff --git a/arch/x86_64/arch/devices/local_apic.cpp b/arch/x86_64/arch/devices/local_apic.cpp
index b481a667..f3ab8d32 100644
--- a/arch/x86_64/arch/devices/local_apic.cpp
+++ b/arch/x86_64/arch/devices/local_apic.cpp
@@ -74,9 +74,10 @@ namespace arch::devices
     divide_configuration = 0x3e0,
   };
 
-  local_apic::local_apic(std::size_t major, std::size_t minor, std::uint64_t hardware_id,
+  local_apic::local_apic(std::size_t major, std::size_t minor, std::uint64_t core_index, std::uint64_t hardware_id,
                          kapi::memory::physical_address base, bool is_bsp)
       : kapi::devices::device{major, minor, "lapic"}
+      , m_core_index{core_index}
       , m_hardware_id{hardware_id}
       , m_base{base}
       , m_is_bsp{is_bsp}
@@ -119,6 +120,11 @@ namespace arch::devices
     return true;
   }
 
+  auto local_apic::core_index() const noexcept -> std::uint64_t
+  {
+    return m_core_index;
+  }
+
   auto local_apic::read_register(registers id) const -> std::uint32_t
   {
     auto reg = static_cast<std::uint32_t volatile *>(m_mapped_region.first + std::to_underlying(id));
diff --git a/arch/x86_64/arch/devices/local_apic.hpp b/arch/x86_64/arch/devices/local_apic.hpp
index f8f080dc..3a2d5417 100644
--- a/arch/x86_64/arch/devices/local_apic.hpp
+++ b/arch/x86_64/arch/devices/local_apic.hpp
@@ -12,17 +12,20 @@ namespace arch::devices
 
   struct local_apic : kapi::devices::device
   {
-    local_apic(std::size_t major, std::size_t minor, std::uint64_t hardware_id, kapi::memory::physical_address base,
-               bool is_bsp);
+    local_apic(std::size_t major, std::size_t minor, std::uint64_t core_index, std::uint64_t hardware_id,
+               kapi::memory::physical_address base, bool is_bsp);
 
     auto init() -> bool override;
 
+    [[nodiscard]] auto core_index() const noexcept -> std::uint64_t;
+
   private:
     enum struct registers : std::ptrdiff_t;
 
     [[nodiscard]] auto read_register(registers id) const -> std::uint32_t;
     auto write_register(registers id, std::uint32_t value) -> void;
 
+    std::uint64_t m_core_index{};
     std::uint64_t m_hardware_id{};
     kapi::memory::physical_address m_base{};
     kapi::memory::mmio_region m_mapped_region{};
diff --git a/arch/x86_64/kapi/cpu.cpp b/arch/x86_64/kapi/cpu.cpp
index 70cd3635..c51e08b3 100644
--- a/arch/x86_64/kapi/cpu.cpp
+++ b/arch/x86_64/kapi/cpu.cpp
@@ -74,9 +74,10 @@ namespace kapi::cpu
     {
       auto is_bsp = !bsp_found;
       bsp_found = true;
-      auto core = kstd::make_unique<devices::cpu::core>(core_major, core_count, apic.processor_id(), is_bsp);
-      core->add_child(kstd::make_unique<arch::devices::local_apic>(interrupt_controller_major, core_count, apic.id(),
-                                                                   local_apic_address, is_bsp));
+      auto core =
+          kstd::make_unique<devices::cpu::core>(core_major, core_count, core_count, apic.processor_id(), is_bsp);
+      core->add_child(kstd::make_unique<arch::devices::local_apic>(interrupt_controller_major, core_count, core_count,
+                                                                   apic.id(), local_apic_address, is_bsp));
       cpu_bus->add_child(std::move(core));
       ++core_count;
     }
diff --git a/kapi/kapi/devices/cpu.hpp b/kapi/kapi/devices/cpu.hpp
index f8ff60c6..a39580b4 100644
--- a/kapi/kapi/devices/cpu.hpp
+++ b/kapi/kapi/devices/cpu.hpp
@@ -15,12 +15,15 @@ namespace kapi::devices
     //! 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);
+      explicit core(std::size_t major_number, std::size_t minor_number, std::uint64_t index, std::uint64_t hardware_id,
+                    bool is_bsp);
 
       [[nodiscard]] auto hardware_id() const -> std::uint64_t;
       [[nodiscard]] auto is_bsp() const -> bool;
+      [[nodiscard]] auto index() const noexcept -> std::uint64_t;
 
     private:
+      std::uint64_t m_index;
       std::uint64_t m_hardware_id;
       bool m_is_bsp;
     };
diff --git a/kernel/kapi/devices/cpu.cpp b/kernel/kapi/devices/cpu.cpp
index f0e1d725..da55cf2c 100644
--- a/kernel/kapi/devices/cpu.cpp
+++ b/kernel/kapi/devices/cpu.cpp
@@ -8,12 +8,19 @@
 namespace kapi::devices
 {
 
-  cpu::core::core(std::size_t major_number, std::size_t minor_number, std::uint64_t hardware_id, bool is_bsp)
+  cpu::core::core(std::size_t major_number, std::size_t minor_number, std::uint64_t index, std::uint64_t hardware_id,
+                  bool is_bsp)
       : kapi::devices::bus{major_number, minor_number, "cpu_core"}
+      , m_index{index}
       , m_hardware_id{hardware_id}
       , m_is_bsp{is_bsp}
   {}
 
+  auto cpu::core::index() const noexcept -> std::uint64_t
+  {
+    return m_index;
+  }
+
   auto cpu::core::hardware_id() const -> std::uint64_t
   {
     return m_hardware_id;