find_program(QEMU qemu-system-${TARGET_ARCH} REQUIRED)
if (NOT QEMU)
	message(STATUS "QEMU: Cannot find qemu-system-${TARGET_ARCH}. Direct-kernel boot unavailable")
	return()
endif ()

find_program(LLDB lldb)
find_program(GDB gdb)

set(patched_kernel ${CMAKE_CURRENT_BINARY_DIR}/kernel/${kernel_name}.elf32)
set(generic_flags -m 1G)
set(no_debug_flags)

if (${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Linux")
	message(STATUS "QEMU: Enabling KVM acceleration")
	set(no_debug_flags ${no_debug_flags} -enable-kvm)
else ()
	message(STATUS "QEMU: Host system is not Linux. KVM acceleration unavailable")
endif ()

add_custom_command(OUTPUT ${patched_kernel}
	DEPENDS ${kernel_name}
	COMMAND ${CMAKE_COMMAND} -E copy
		$<TARGET_FILE:${kernel_name}>
		${patched_kernel}
	COMMAND ${BUILD_TOOLS_DIR}/e64patch ${patched_kernel}
	WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
	COMMENT "Patching kernel elf64 image"
)

message(STATUS "QEMU: Enable direct-kernel boot")
add_custom_target(run-kernel
	COMMAND
		${QEMU}
		-kernel ${patched_kernel}
		-initrd ${sys_dir}/${bsp_name}
		${generic_flags} ${no_debug_flags}
		-serial stdio
		--append kernel.early-console=ttyS0
	USES_TERMINAL
	DEPENDS ${patched_kernel} bsp)

add_custom_target(run-kernel-monitor
	COMMAND
		${QEMU}
		-kernel ${patched_kernel}
		-initrd ${sys_dir}/${bsp_name}
		${generic_flags} ${no_debug_flags}
		-monitor stdio
	USES_TERMINAL
	DEPENDS ${patched_kernel} bsp)

if (image_cdrom)
	message(STATUS "QEMU: Enable CD-ROM boot")
	add_custom_target(run-cdrom
		COMMAND
			${QEMU}
			-cdrom ${image_cdrom}
			${generic_flags} ${no_debug_flags}
			-serial stdio
		USES_TERMINAL
		DEPENDS ${image_cdrom})
endif ()

if (LLDB)
	message(STATUS "QEMU: Enable direct-kernel debug with LLDB")
	add_custom_target(debug-kernel
		COMMAND
			${QEMU}
				-kernel ${patched_kernel}
				-initrd ${sys_dir}/${bsp_name}
				${generic_flags}
				-s -S &
			${LLDB}
				-o "file ${CMAKE_BINARY_DIR}/kernel/${kernel_name}.debug"
				-o "gdb-remote localhost:1234"
		USES_TERMINAL
		DEPENDS ${patched_kernel} bsp)

	if (image_cdrom)
		message(STATUS "QEMU: Enable CD-ROM debug with LLDB")
		add_custom_target(debug-cdrom
			COMMAND
				${QEMU}
				-cdrom ${image_cdrom}
				${generic_flags}
				-s -S &
			${LLDB}
				-o "file ${CMAKE_BINARY_DIR}/kernel/${kernel_name}.debug"
				-o "target remote localhost:1234"
			USES_TERMINAL
			DEPENDS cdrom)
	endif ()
elseif (GDB)
	message(STATUS "QEMU: Enable direct-kernel debug with GDB")
	add_custom_target(debug-kernel
		COMMAND
			${QEMU}
				-kernel ${patched_kernel}
				-initrd ${sys_dir}/${bsp_name}
				${generic_flags}
				-s -S &
			${GDB}  -tui
				-ex "file ${CMAKE_BINARY_DIR}/kernel/${kernel_name}.debug"
				-ex "target remote localhost:1234"
		USES_TERMINAL
		DEPENDS ${patched_kernel} bsp)

	if (image_cdrom)
		message(STATUS "QEMU: Enable CD-ROM debug with GDB")
		add_custom_target(debug-cdrom
			COMMAND
				${QEMU}
				-cdrom ${image_cdrom}
				${generic_flags}
				-s -S &
			${GDB}  -tui
				-ex "file ${CMAKE_BINARY_DIR}/kernel/${kernel_name}.debug"
				-ex "target remote localhost:1234"
			USES_TERMINAL
			DEPENDS ${image_cdrom})
	endif ()
endif ()