meta: add debugging library

the debug library can be used by both server (the kernel) and client
(the debugger) applications. the library implements the protocol
that is used for communication between the kernel and debugger, as
well as handling for any requests supported by the protocol.

CMakeLists.txt

@@ -69,7 +69,19 @@ add_custom_command(
 	COMMAND ${CMAKE_STRIP} -g $<TARGET_FILE:${kernel_exe_name}>)
 
 target_link_libraries(${kernel_exe_name} -nostdlib -ffreestanding -lgcc)
-target_compile_definitions(${kernel_exe_name} PRIVATE KERNEL_VERSION="${kernel_version}")
+target_compile_definitions(${kernel_exe_name} PRIVATE
+	KERNEL_NAME="${kernel_name}"
+	KERNEL_VERSION="${kernel_version}"
+	KERNEL_ARCH="${kernel_arch}")
 
 include(arch/${kernel_arch}/config.cmake)
 include(arch/${kernel_arch}/targets.cmake)
+
+add_subdirectory(debug)
+target_link_libraries(${kernel_exe_name} magenta_debug)
+target_compile_definitions(magenta_debug PRIVATE KERNEL_VERSION="${kernel_version}")
+target_include_directories(magenta_debug PRIVATE
+	include
+	libc/include
+	libmagenta/include
+	arch/${kernel_arch}/include)