os: rework kernel architecture

Rework the code structure and architecture of the kernel by separating
platform-dependent and platform-independent code more cleanly. As of
this patchset, full feature parity has not been achieved. Nonetheless, a
sufficient subset of functionality has been ported to the new
architecture to demonstrate the feasibility of the new structure.

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/x86_64/src/boot/initialize_runtime.cpp b/arch/x86_64/src/boot/initialize_runtime.cpp
new file mode 100644
index 0000000..46dd5e4
--- /dev/null
+++ b/arch/x86_64/src/boot/initialize_runtime.cpp
@@ -0,0 +1,26 @@
+#include <algorithm>
+#include <functional>
+#include <span>
+
+extern "C"
+{
+  using global_initializer = auto (*)() -> void;
+
+  extern global_initializer __ctors_start;
+  extern global_initializer __ctors_end;
+  extern global_initializer __init_array_start;
+  extern global_initializer __init_array_end;
+
+  auto invoke_global_constructors() -> void
+  {
+    auto constructors = std::span{&__ctors_start, &__ctors_end};
+    auto initializers = std::span{&__init_array_start, &__init_array_end};
+
+    auto apply_invoke = [](auto invokable) -> void {
+      std::invoke(invokable);
+    };
+
+    std::ranges::for_each(constructors, apply_invoke);
+    std::ranges::for_each(initializers, apply_invoke);
+  }
+}