Added execv() and system().

src/include/gpxe/command.h

@@ -0,0 +1,22 @@
+#ifndef _GPXE_COMMAND_H
+#define _GPXE_COMMAND_H
+
+#include <gpxe/tables.h>
+
+/** A command-line command */
+struct command {
+	/** Name of the command */
+	const char *name;
+	/**
+	 * Function implementing the command
+	 *
+	 * @v argc		Argument count
+	 * @v argv		Argument list
+	 * @ret rc		Return status code
+	 */
+	int ( * exec ) ( int argc, char **argv );
+};
+
+#define __command __table ( commands, 01 )
+
+#endif /* _GPXE_COMMAND_H */