diff --git a/src/sys/include/sys/gen_calls.h b/src/sys/include/sys/gen_calls.h
new file mode 100644
index 0000000..effe096
--- /dev/null
+++ b/src/sys/include/sys/gen_calls.h
@@ -0,0 +1,46 @@
+/*****************************************************************************************
+ Copyright (c) 2002-2004 The UbixOS Project
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without modification, are
+ permitted provided that the following conditions are met:
+
+ Redistributions of source code must retain the above copyright notice, this list of
+ conditions, the following disclaimer and the list of authors.  Redistributions in binary
+ form must reproduce the above copyright notice, this list of conditions, the following
+ disclaimer and the list of authors in the documentation and/or other materials provided
+ with the distribution. Neither the name of the UbixOS Project nor the names of its
+ contributors may be used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+ EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ $Id$
+
+*****************************************************************************************/
+
+#ifndef _GEN_CALLS_H
+#define _GEN_CALLS_H
+
+#include <sys/sysproto.h>
+
+struct thread {
+  int a;
+  };
+
+int  sys_write(struct thread *, struct write_args *);
+
+#endif
+
+/***
+ END
+ ***/
+
diff --git a/src/sys/include/sys/sysproto.h b/src/sys/include/sys/sysproto.h
new file mode 100644
index 0000000..fa7717a
--- /dev/null
+++ b/src/sys/include/sys/sysproto.h
@@ -0,0 +1,59 @@
+/*****************************************************************************************
+ Copyright (c) 2002-2004 The UbixOS Project
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without modification, are
+ permitted provided that the following conditions are met:
+
+ Redistributions of source code must retain the above copyright notice, this list of
+ conditions, the following disclaimer and the list of authors.  Redistributions in binary
+ form must reproduce the above copyright notice, this list of conditions, the following
+ disclaimer and the list of authors in the documentation and/or other materials provided
+ with the distribution. Neither the name of the UbixOS Project nor the names of its
+ contributors may be used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+ EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ $Id$
+
+*****************************************************************************************/
+
+#ifndef _SYSPROTO_H
+#define _SYSPROTO_H
+
+typedef int register_t;
+
+#define PAD_(t) (sizeof(register_t) <= sizeof(t) ? \
+                0 : sizeof(register_t) - sizeof(t))
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define PADL_(t)        0
+#define PADR_(t)        PAD_(t)
+#else
+#define PADL_(t)        PAD_(t)
+#define PADR_(t)        0
+#endif
+
+
+struct write_args {
+        char fd_l_[PADL_(int)]; int fd; char fd_r_[PADR_(int)];
+        char buf_l_[PADL_(const void *)]; const void * buf; char buf_r_[PADR_(const void *)];
+        char nbyte_l_[PADL_(size_t)]; size_t nbyte; char nbyte_r_[PADR_(size_t)];
+};
+
+
+#endif
+
+/***
+ END
+ ***/
+