first usable version of kernel and commands

After an year of hard work, this is a first "usable" version of Jehanne.

qa/lib/c/conswrite.c

@@ -0,0 +1,39 @@
+/*
+ * This file is part of Jehanne.
+ *
+ * Copyright (C) 2015 Giacomo Tesio <giacomo@tesio.it>
+ *
+ * Jehanne is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * Jehanne is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <u.h>
+#include <libc.h>
+
+#define BUFSZ (32*1024)
+void
+main(void)
+{
+	int w;
+	char msg[BUFSZ];
+	print("This test write 32k 1 to stderr to test /dev/cons behaviour.\n");
+	print("The test pass if the everything get written, including 'PASS'.\n");
+
+	memset(msg, '1', BUFSZ);
+
+	if((w = write(2, msg, BUFSZ)) < BUFSZ){
+		print("\nFAIL, written %d instead of %d\n", w, BUFSZ);
+		exits("FAIL");
+	}
+
+	print("\nPASS\n");
+	exits("PASS");
+}