kapi: extract interrupts API

1 files changed, 68 insertions, 0 deletions

diff --git a/arch/x86_64/kapi/interrupts.cpp b/arch/x86_64/kapi/interrupts.cpp
new file mode 100644
index 0000000..babc926
--- /dev/null
+++ b/arch/x86_64/kapi/interrupts.cpp
@@ -0,0 +1,68 @@
+#include "kapi/interrupts.hpp"
+
+#include "kapi/system.hpp"
+
+#include <kstd/print>
+#include <kstd/vector>
+
+#include <array>
+#include <cstdint>
+
+namespace kapi::interrupts
+{
+
+  namespace
+  {
+    constexpr auto irq_offset = 32uz;
+    auto constinit handlers = std::array<kstd::vector<handler *>, 256 - irq_offset>{};
+  }  // namespace
+
+  auto enable() -> void
+  {
+    asm volatile("sti");
+  }
+
+  auto disable() -> void
+  {
+    asm volatile("cli");
+  }
+
+  auto register_handler(std::uint32_t irq_number, handler & handler) -> void
+  {
+    if (irq_number < irq_offset)
+    {
+      system::panic("[x86_64:CPU] IRQ number must be in range [32, 255].");
+    }
+
+    handlers[irq_number - irq_offset].push_back(&handler);
+  }
+
+  auto unregister_handler(std::uint32_t irq_number, [[maybe_unused]] handler & handler) -> void
+  {
+    if (irq_number < irq_offset)
+    {
+      system::panic("[x86_64:CPU] IRQ number must be in range [32, 255].");
+    }
+
+    kstd::println("[x86_64:CPU] TODO: support erasure from vector.");
+  }
+
+  auto dispatch(std::uint32_t irq_number) -> status
+  {
+    if (irq_number < irq_offset)
+    {
+      return status::unhandled;
+    }
+
+    for (auto handler : handlers[irq_number - irq_offset])
+    {
+      if (handler && handler->handle_interrupt(irq_number) == status::handled)
+      {
+        return status::handled;
+      }
+    }
+
+    return status::unhandled;
+  }
+
+}  // namespace kapi::interrupts
\ No newline at end of file