2 files changed, 39 insertions, 0 deletions
diff --git a/kern/include/kern/error.hpp b/kern/include/kern/error.hpp
new file mode 100644
index 0000000..e58b9f1
--- /dev/null
+++ b/kern/include/kern/error.hpp
@@ -0,0 +1,13 @@
+#ifndef TEACHOS_KERN_ERROR_HPP
+#define TEACHOS_KERN_ERROR_HPP
+
+#include <source_location>
+#include <string_view>
+
+namespace teachos
+{
+  [[noreturn]]
+  auto panic(std::string_view message, std::source_location = std::source_location::current()) -> void;
+}
+
+#endif
diff --git a/kern/include/kern/print.hpp b/kern/include/kern/print.hpp
new file mode 100644
index 0000000..fc9b5d6
--- /dev/null
+++ b/kern/include/kern/print.hpp
@@ -0,0 +1,26 @@
+
+#ifndef TEACHOS_KERN_PRINT_HPP
+#define TEACHOS_KERN_PRINT_HPP
+
+#include <string_view>
+
+namespace teachos
+{
+
+  using print_handler = auto(std::string_view) -> void;
+  using println_handler = auto(std::string_view) -> void;
+
+  auto print(std::string_view text) -> void;
+  auto println(std::string_view text) -> void;
+
+  auto print_error(std::string_view text) -> void;
+  auto println_error(std::string_view text) -> void;
+
+  auto set_print_handler(print_handler handler) -> print_handler *;
+  auto set_println_handler(println_handler handler) -> print_handler *;
+  auto set_print_error_handler(print_handler handler) -> print_handler *;
+  auto set_println_error_handler(println_handler handler) -> print_handler *;
+
+}  // namespace teachos
+
+#endif