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diff --git a/sos-code-article4/drivers/bochs.h b/sos-code-article4/drivers/bochs.h
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+/* Copyright (C) 2004  David Decotigny
+   Copyright (C) 1999  Free Software Foundation, Inc.
+
+   This program 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; either version 2
+   of the License, or (at your option) any later version.
+   
+   This program 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 this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+   USA. 
+*/
+#ifndef _SOS_BOCHS_H_
+#define _SOS_BOCHS_H_
+
+/**
+ * @file bochs.h
+ *
+ * If you compiled Bochs with the --enable-e9-hack, then any character
+ * printed to the 0xE9 I/O port is printed to the xterm that is
+ * running Bochs. This may appear to be a detail, but in fact, this
+ * functionnality is *VERY* precious for debugging purposes. This
+ * """driver""" handles this feature.
+ */
+
+#include <sos/errno.h>
+#include <sos/types.h>
+
+sos_ret_t sos_bochs_setup(void);
+
+sos_ret_t sos_bochs_putstring(const char* str);
+
+/** Print the least signficant 32 (nbytes == 4), 24 (nbytes == 3), 16
+    (nbytes == 2) or 8 (nbytes == 1) bits of val in hexadecimal. */
+sos_ret_t sos_bochs_puthex(unsigned val, int nbytes);
+
+/** hexdump-style pretty printing */
+sos_ret_t sos_bochs_hexdump(const void* addr, int nbytes);
+
+/**
+ * Print the formatted string. Very restricted version of printf(3):
+ * 1/ can print max 255 chars, 2/ supports only %d/%i, %c, %s, %x
+ * without any support for flag charachters (eg %08x).
+ */
+sos_ret_t sos_bochs_printf(const char *format, /* args */...)
+     __attribute__ ((format (printf, 1, 2)));
+
+#endif