cmake: implementing bootable CD-ROM image generation with GRUB

arch/x86_64/Arch.cmake

@@ -1 +1,2 @@
+include(System-Disk)
 include(QEMU)

arch/x86_64/System-Disk.cmake

@@ -0,0 +1,17 @@
+find_program(GRUB_MKRESCUE grub-mkrescue)
+
+if (GRUB_MKRESCUE)
+	message(STATUS "GRUB: Found grub-mkrescue. Bootable CD-ROM image creation is enabled")
+	set(image_cdrom ${CMAKE_CURRENT_BINARY_DIR}/rosetta-system.iso)
+
+	add_custom_target(cdrom
+		DEPENDS sysroot
+		COMMAND ${GRUB_MKRESCUE}
+			-o ${image_cdrom}
+			${CMAKE_CURRENT_BINARY_DIR}/sysroot
+		WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+		COMMENT "Building GRUB CD-ROM image"
+	)
+else ()
+	message(STATUS "Cannot find grub-mkrescue. Bootable CD-ROM image creation is unavailable")
+endif ()