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diff --git a/sos-code-article6.5/sos/types.h b/sos-code-article6.5/sos/types.h
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+/* Copyright (C) 2004  The SOS Team
+
+   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_TYPES_H_
+#define _SOS_TYPES_H_
+
+/**
+ * @file types.h
+ *
+ * SOS basic types definition
+ */
+
+/** Physical address */
+typedef unsigned int       sos_paddr_t;
+
+/** Kernel virtual address */
+typedef unsigned int       sos_vaddr_t;
+
+/** Memory size of an object (positive) */
+typedef unsigned int       sos_size_t;
+/** Generic count of objects */
+typedef unsigned int       sos_count_t;
+
+/** Low-level sizes */
+typedef unsigned long int  sos_ui32_t; /* 32b unsigned */
+typedef unsigned short int sos_ui16_t; /* 16b unsigned */
+typedef unsigned char      sos_ui8_t;  /* 8b unsigned */
+typedef signed long int    sos_si32_t; /* 32b signed */
+typedef signed short int   sos_si16_t; /* 16b signed */
+typedef signed char        sos_si8_t;  /* 8b signed */
+
+typedef enum { FALSE=0, TRUE } sos_bool_t;
+
+/** Not a proper type, but highly useful with basic type
+    manipulations */
+#define NULL ((void*)0)
+
+#endif /* _SOS_TYPES_H_ */