diff --git a/Makefile b/Makefile
index 1322fb4..46d28d3 100644
--- a/Makefile
+++ b/Makefile
@@ -18,6 +18,7 @@ SRC = \
 
 ifeq ($(OS),linux)
 SRC += \
+	halt.c              \
 	insmod.c            \
 	lsmod.c             \
 	mkswap.c            \
diff --git a/halt.c b/halt.c
new file mode 100644
index 0000000..3408988
--- /dev/null
+++ b/halt.c
@@ -0,0 +1,40 @@
+/* See LICENSE file for copyright and license details. */
+#include <linux/reboot.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include <stdio.h>
+#include "util.h"
+
+static void
+usage(void)
+{
+	eprintf("usage: %s [-p]\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int pflag = 0;
+	int cmd = LINUX_REBOOT_CMD_HALT;
+
+	ARGBEGIN {
+	case 'p':
+		pflag = 1;
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if (argc > 0)
+		usage();
+
+	sync();
+
+	if (pflag)
+		cmd = LINUX_REBOOT_CMD_POWER_OFF;
+
+	if (syscall(__NR_reboot, 0xfee1dead, 672274793,
+		    cmd, NULL) < 0)
+		eprintf("reboot:");
+	return 0;
+}