2007-05-29 Joel Sherrill <joel.sherrill@OARcorp.com>

	* sapi/Makefile.am, sapi/include/rtems/io.h, sapi/src/io.c: Split into
	one function per file execpt io.c which contains required
	initialization methods.
	* sapi/src/ioclose.c, sapi/src/iocontrol.c, sapi/src/iodata.c,
	sapi/src/ioinitialize.c, sapi/src/ioopen.c, sapi/src/ioread.c,
	sapi/src/ioregisterdriver.c, sapi/src/iounregisterdriver.c,
	sapi/src/iowrite.c: New files.

12 files changed, 466 insertions, 296 deletions

diff --git a/cpukit/sapi/Makefile.am b/cpukit/sapi/Makefile.am
index 531d0e779a..ad4b3fa864 100644
--- a/cpukit/sapi/Makefile.am
+++ b/cpukit/sapi/Makefile.am
@@ -22,8 +22,10 @@ AM_CPPFLAGS += -D__RTEMS_INSIDE__
 noinst_LIBRARIES = libsapi.a
 libsapi_a_SOURCES = src/debug.c src/extension.c src/extensioncreate.c \
     src/extensiondelete.c src/extensionident.c src/fatal.c src/exinit.c \
-    src/exshutdown.c src/io.c src/itronapi.c src/posixapi.c src/rtemsapi.c \
-    src/extensiondata.c
+    src/exshutdown.c src/io.c src/ioclose.c src/iocontrol.c src/iodata.c \
+    src/ioinitialize.c src/ioopen.c src/ioread.c src/ioregisterdriver.c \
+    src/iounregisterdriver.c src/iowrite.c src/itronapi.c src/posixapi.c  \
+    src/rtemsapi.c src/extensiondata.c
 libsapi_a_CPPFLAGS = $(AM_CPPFLAGS)
 
 include $(srcdir)/preinstall.am
diff --git a/cpukit/sapi/include/rtems/io.h b/cpukit/sapi/include/rtems/io.h
index ace50f0459..fdabc028b6 100644
--- a/cpukit/sapi/include/rtems/io.h
+++ b/cpukit/sapi/include/rtems/io.h
@@ -30,6 +30,10 @@
 #ifndef _RTEMS_IO_H
 #define _RTEMS_IO_H
 
+#ifndef SAPI_IO_EXTERN
+#define SAPI_IO_EXTERN extern
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -88,8 +92,8 @@ typedef struct {
  *  Address Table and Device Name Table.
  */
 
-SAPI_EXTERN uint32_t                    _IO_Number_of_drivers;
-SAPI_EXTERN rtems_driver_address_table *_IO_Driver_address_table;
+SAPI_IO_EXTERN uint32_t                    _IO_Number_of_drivers;
+SAPI_IO_EXTERN rtems_driver_address_table *_IO_Driver_address_table;
 
 /*
  *  _IO_Manager_initialization
diff --git a/cpukit/sapi/src/io.c b/cpukit/sapi/src/io.c
index f200a514ac..bd5cd4f0ec 100644
--- a/cpukit/sapi/src/io.c
+++ b/cpukit/sapi/src/io.c
@@ -1,8 +1,7 @@
 /*
- *  Input/Output Manager
+ *  Input/Output Manager - Initialize Device Driver Subsystem
  *
- *
- *  COPYRIGHT (c) 1989-1999.
+ *  COPYRIGHT (c) 1989-2007.
  *  On-Line Applications Research Corporation (OAR).
  *
  *  The license and distribution terms for this file may be
@@ -24,8 +23,7 @@
 
 #include <string.h>
 
-/*PAGE
- *
+/*
  *  _IO_Manager_initialization
  *
  *  The IO manager has been extended to support runtime driver
@@ -81,8 +79,7 @@ void _IO_Manager_initialization(
   number_of_drivers = drivers_in_table;
 }
 
-/*PAGE
- *
+/*
  *  _IO_Initialize_all_drivers
  *
  *  This routine initializes all device drivers
@@ -99,288 +96,3 @@ void _IO_Initialize_all_drivers( void )
    for ( major=0 ; major < _IO_Number_of_drivers ; major ++ )
      (void) rtems_io_initialize( major, 0, NULL );
 }
-
-/*PAGE
- *
- *  rtems_io_register_driver
- *
- *  Register a driver into the device driver table.
- *
- *  Input Paramters:
- *    major            - device major number (0 means allocate
- *                       a number)
- *    driver_table     - driver callout function table
- *    registered_major - the major number which is registered
- *
- *  Output Parameters:
- *    RTEMS_SUCCESSFUL - if successful
- *    error code       - if unsuccessful
- */
-
-rtems_status_code rtems_io_register_driver(
-  rtems_device_major_number   major,
-  rtems_driver_address_table *driver_table,
-  rtems_device_major_number  *registered_major
-)
-{
-
-  /*
-   *  Validate the pointer data and contents passed in
-   */
-  if ( !driver_table )
-    return RTEMS_INVALID_ADDRESS;
-
-  if ( !registered_major )
-    return RTEMS_INVALID_ADDRESS;
-
-  if ( !driver_table->initialization_entry && !driver_table->open_entry )
-    return RTEMS_INVALID_ADDRESS;
-
-  *registered_major = 0;
-
-  /*
-   *  The requested major number is higher than what is configured.
-   */
-  if ( major >= _IO_Number_of_drivers )
-    return RTEMS_INVALID_NUMBER;
-
-  /*
-   * Test for initialise/open being present to indicate the driver slot is
-   * in use.
-   */
-
-  if ( major == 0 ) {
-    boolean found = FALSE;
-    for ( major = _IO_Number_of_drivers - 1 ; major ; major-- ) {
-      if ( !_IO_Driver_address_table[major].initialization_entry &&
-           !_IO_Driver_address_table[major].open_entry ) {
-        found = TRUE;
-        break;
-      }
-    }
-
-    if ( !found )
-      return RTEMS_TOO_MANY;
-  }
-
-  if ( _IO_Driver_address_table[major].initialization_entry ||
-       _IO_Driver_address_table[major].open_entry )
-    return RTEMS_RESOURCE_IN_USE;
-
-
-  _IO_Driver_address_table[major] = *driver_table;
-  *registered_major               = major;
-
-  rtems_io_initialize( major, 0, NULL );
-
-  return RTEMS_SUCCESSFUL;
-}
-
-/*PAGE
- *
- *  rtems_io_unregister_driver
- *
- *  Unregister a driver from the device driver table.
- *
- *  Input Paramters:
- *    major            - device major number
- *
- *  Output Parameters:
- *    RTEMS_SUCCESSFUL - if successful
- *    error code       - if unsuccessful
- */
-
-rtems_status_code rtems_io_unregister_driver(
-  rtems_device_major_number major
-)
-{
-  if ( major < _IO_Number_of_drivers ) {
-    memset(
-      &_IO_Driver_address_table[major],
-      0,
-      sizeof( rtems_driver_address_table )
-    );
-    return RTEMS_SUCCESSFUL;
-  }
-  return RTEMS_UNSATISFIED;
-}
-
-/*PAGE
- *
- *  rtems_io_initialize
- *
- *  This routine is the initialization directive of the IO manager.
- *
- *  Input Paramters:
- *    major        - device driver number
- *    minor        - device number
- *    argument     - pointer to argument(s)
- *
- *  Output Parameters:
- *    returns       - return code
- */
-
-rtems_status_code rtems_io_initialize(
-  rtems_device_major_number  major,
-  rtems_device_minor_number  minor,
-  void                      *argument
-)
-{
-  rtems_device_driver_entry callout;
-
-  if ( major >= _IO_Number_of_drivers )
-    return RTEMS_INVALID_NUMBER;
-
-  callout = _IO_Driver_address_table[major].initialization_entry;
-  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
-}
-
-/*PAGE
- *
- *  rtems_io_open
- *
- *  This routine is the open directive of the IO manager.
- *
- *  Input Paramters:
- *    major        - device driver number
- *    minor        - device number
- *    argument     - pointer to argument(s)
- *
- *  Output Parameters:
- *    returns       - return code
- */
-
-rtems_status_code rtems_io_open(
-  rtems_device_major_number  major,
-  rtems_device_minor_number  minor,
-  void                      *argument
-)
-{
-  rtems_device_driver_entry callout;
-
-  if ( major >= _IO_Number_of_drivers )
-    return RTEMS_INVALID_NUMBER;
-
-  callout = _IO_Driver_address_table[major].open_entry;
-  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
-}
-
-/*PAGE
- *
- *  rtems_io_close
- *
- *  This routine is the close directive of the IO manager.
- *
- *  Input Paramters:
- *    major        - device driver number
- *    minor        - device number
- *    argument     - pointer to argument(s)
- *
- *  Output Parameters:
- *    returns       - return code
- */
-
-rtems_status_code rtems_io_close(
-  rtems_device_major_number  major,
-  rtems_device_minor_number  minor,
-  void                      *argument
-)
-{
-  rtems_device_driver_entry callout;
-
-  if ( major >= _IO_Number_of_drivers )
-    return RTEMS_INVALID_NUMBER;
-
-  callout = _IO_Driver_address_table[major].close_entry;
-  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
-}
-
-/*PAGE
- *
- *  rtems_io_read
- *
- *  This routine is the read directive of the IO manager.
- *
- *  Input Paramters:
- *    major        - device driver number
- *    minor        - device number
- *    argument     - pointer to argument(s)
- *
- *  Output Parameters:
- *    returns       - return code
- */
-
-rtems_status_code rtems_io_read(
-  rtems_device_major_number  major,
-  rtems_device_minor_number  minor,
-  void                      *argument
-)
-{
-  rtems_device_driver_entry callout;
-
-  if ( major >= _IO_Number_of_drivers )
-    return RTEMS_INVALID_NUMBER;
-
-  callout = _IO_Driver_address_table[major].read_entry;
-  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
-}
-
-/*PAGE
- *
- *  rtems_io_write
- *
- *  This routine is the write directive of the IO manager.
- *
- *  Input Paramters:
- *    major        - device driver number
- *    minor        - device number
- *    argument     - pointer to argument(s)
- *
- *  Output Parameters:
- *    returns       - return code
- */
-
-rtems_status_code rtems_io_write(
-  rtems_device_major_number  major,
-  rtems_device_minor_number  minor,
-  void                      *argument
-)
-{
-  rtems_device_driver_entry callout;
-
-  if ( major >= _IO_Number_of_drivers )
-    return RTEMS_INVALID_NUMBER;
-
-  callout = _IO_Driver_address_table[major].write_entry;
-  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
-}
-
-/*PAGE
- *
- *  rtems_io_control
- *
- *  This routine is the control directive of the IO manager.
- *
- *  Input Paramters:
- *    major        - device driver number
- *    minor        - device number
- *    argument     - pointer to argument(s)
- *
- *  Output Parameters:
- *    returns       - return code
- */
-
-rtems_status_code rtems_io_control(
-  rtems_device_major_number  major,
-  rtems_device_minor_number  minor,
-  void                      *argument
-)
-{
-  rtems_device_driver_entry callout;
-
-  if ( major >= _IO_Number_of_drivers )
-    return RTEMS_INVALID_NUMBER;
-
-  callout = _IO_Driver_address_table[major].control_entry;
-  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
-}
diff --git a/cpukit/sapi/src/ioclose.c b/cpukit/sapi/src/ioclose.c
new file mode 100644
index 0000000000..65d43f55ec
--- /dev/null
+++ b/cpukit/sapi/src/ioclose.c
@@ -0,0 +1,48 @@
+/*
+ *  Input/Output Manager -- Close Device
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/io.h>
+
+/*
+ *  rtems_io_close
+ *
+ *  This routine is the close directive of the IO manager.
+ *
+ *  Input Paramters:
+ *    major        - device driver number
+ *    minor        - device number
+ *    argument     - pointer to argument(s)
+ *
+ *  Output Parameters:
+ *    returns       - return code
+ */
+
+rtems_status_code rtems_io_close(
+  rtems_device_major_number  major,
+  rtems_device_minor_number  minor,
+  void                      *argument
+)
+{
+  rtems_device_driver_entry callout;
+
+  if ( major >= _IO_Number_of_drivers )
+    return RTEMS_INVALID_NUMBER;
+
+  callout = _IO_Driver_address_table[major].close_entry;
+  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
+}
diff --git a/cpukit/sapi/src/iocontrol.c b/cpukit/sapi/src/iocontrol.c
new file mode 100644
index 0000000000..1f1d0d38ea
--- /dev/null
+++ b/cpukit/sapi/src/iocontrol.c
@@ -0,0 +1,48 @@
+/*
+ *  Input/Output Manager - Device Control
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/io.h>
+
+/*
+ *  rtems_io_control
+ *
+ *  This routine is the control directive of the IO manager.
+ *
+ *  Input Paramters:
+ *    major        - device driver number
+ *    minor        - device number
+ *    argument     - pointer to argument(s)
+ *
+ *  Output Parameters:
+ *    returns       - return code
+ */
+
+rtems_status_code rtems_io_control(
+  rtems_device_major_number  major,
+  rtems_device_minor_number  minor,
+  void                      *argument
+)
+{
+  rtems_device_driver_entry callout;
+
+  if ( major >= _IO_Number_of_drivers )
+    return RTEMS_INVALID_NUMBER;
+
+  callout = _IO_Driver_address_table[major].control_entry;
+  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
+}
diff --git a/cpukit/sapi/src/iodata.c b/cpukit/sapi/src/iodata.c
new file mode 100644
index 0000000000..f15de6979d
--- /dev/null
+++ b/cpukit/sapi/src/iodata.c
@@ -0,0 +1,22 @@
+/*
+ *  RTEMS Task Manager -- Instantiate Data
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+/* instantiate RTEMS IO manager data */
+#define SAPI_IO_EXTERN
+
+#include <rtems/system.h>
+#include <rtems/io.h>
diff --git a/cpukit/sapi/src/ioinitialize.c b/cpukit/sapi/src/ioinitialize.c
new file mode 100644
index 0000000000..998edbb6b2
--- /dev/null
+++ b/cpukit/sapi/src/ioinitialize.c
@@ -0,0 +1,48 @@
+/*
+ *  Input/Output Manager - Initialize Device
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/io.h>
+
+/*
+ *  rtems_io_initialize
+ *
+ *  This routine is the initialization directive of the IO manager.
+ *
+ *  Input Paramters:
+ *    major        - device driver number
+ *    minor        - device number
+ *    argument     - pointer to argument(s)
+ *
+ *  Output Parameters:
+ *    returns       - return code
+ */
+
+rtems_status_code rtems_io_initialize(
+  rtems_device_major_number  major,
+  rtems_device_minor_number  minor,
+  void                      *argument
+)
+{
+  rtems_device_driver_entry callout;
+
+  if ( major >= _IO_Number_of_drivers )
+    return RTEMS_INVALID_NUMBER;
+
+  callout = _IO_Driver_address_table[major].initialization_entry;
+  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
+}
diff --git a/cpukit/sapi/src/ioopen.c b/cpukit/sapi/src/ioopen.c
new file mode 100644
index 0000000000..f8f1c84a86
--- /dev/null
+++ b/cpukit/sapi/src/ioopen.c
@@ -0,0 +1,48 @@
+/*
+ *  Input/Output Manager - Open Device
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/io.h>
+
+/*
+ *  rtems_io_open
+ *
+ *  This routine is the open directive of the IO manager.
+ *
+ *  Input Paramters:
+ *    major        - device driver number
+ *    minor        - device number
+ *    argument     - pointer to argument(s)
+ *
+ *  Output Parameters:
+ *    returns       - return code
+ */
+
+rtems_status_code rtems_io_open(
+  rtems_device_major_number  major,
+  rtems_device_minor_number  minor,
+  void                      *argument
+)
+{
+  rtems_device_driver_entry callout;
+
+  if ( major >= _IO_Number_of_drivers )
+    return RTEMS_INVALID_NUMBER;
+
+  callout = _IO_Driver_address_table[major].open_entry;
+  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
+}
diff --git a/cpukit/sapi/src/ioread.c b/cpukit/sapi/src/ioread.c
new file mode 100644
index 0000000000..3b090ef764
--- /dev/null
+++ b/cpukit/sapi/src/ioread.c
@@ -0,0 +1,48 @@
+/*
+ *  Input/Output Manager - Device Read
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/io.h>
+
+/*
+ *  rtems_io_read
+ *
+ *  This routine is the read directive of the IO manager.
+ *
+ *  Input Paramters:
+ *    major        - device driver number
+ *    minor        - device number
+ *    argument     - pointer to argument(s)
+ *
+ *  Output Parameters:
+ *    returns       - return code
+ */
+
+rtems_status_code rtems_io_read(
+  rtems_device_major_number  major,
+  rtems_device_minor_number  minor,
+  void                      *argument
+)
+{
+  rtems_device_driver_entry callout;
+
+  if ( major >= _IO_Number_of_drivers )
+    return RTEMS_INVALID_NUMBER;
+
+  callout = _IO_Driver_address_table[major].read_entry;
+  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
+}
diff --git a/cpukit/sapi/src/ioregisterdriver.c b/cpukit/sapi/src/ioregisterdriver.c
new file mode 100644
index 0000000000..45d5ffe97b
--- /dev/null
+++ b/cpukit/sapi/src/ioregisterdriver.c
@@ -0,0 +1,94 @@
+/*
+ *  Input/Output Manager - Dynamically Register Device Driver
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/io.h>
+
+/*
+ *  rtems_io_register_driver
+ *
+ *  Register a driver into the device driver table.
+ *
+ *  Input Paramters:
+ *    major            - device major number (0 means allocate
+ *                       a number)
+ *    driver_table     - driver callout function table
+ *    registered_major - the major number which is registered
+ *
+ *  Output Parameters:
+ *    RTEMS_SUCCESSFUL - if successful
+ *    error code       - if unsuccessful
+ */
+
+rtems_status_code rtems_io_register_driver(
+  rtems_device_major_number   major,
+  rtems_driver_address_table *driver_table,
+  rtems_device_major_number  *registered_major
+)
+{
+
+  /*
+   *  Validate the pointer data and contents passed in
+   */
+  if ( !driver_table )
+    return RTEMS_INVALID_ADDRESS;
+
+  if ( !registered_major )
+    return RTEMS_INVALID_ADDRESS;
+
+  if ( !driver_table->initialization_entry && !driver_table->open_entry )
+    return RTEMS_INVALID_ADDRESS;
+
+  *registered_major = 0;
+
+  /*
+   *  The requested major number is higher than what is configured.
+   */
+  if ( major >= _IO_Number_of_drivers )
+    return RTEMS_INVALID_NUMBER;
+
+  /*
+   * Test for initialise/open being present to indicate the driver slot is
+   * in use.
+   */
+
+  if ( major == 0 ) {
+    boolean found = FALSE;
+    for ( major = _IO_Number_of_drivers - 1 ; major ; major-- ) {
+      if ( !_IO_Driver_address_table[major].initialization_entry &&
+           !_IO_Driver_address_table[major].open_entry ) {
+        found = TRUE;
+        break;
+      }
+    }
+
+    if ( !found )
+      return RTEMS_TOO_MANY;
+  }
+
+  if ( _IO_Driver_address_table[major].initialization_entry ||
+       _IO_Driver_address_table[major].open_entry )
+    return RTEMS_RESOURCE_IN_USE;
+
+
+  _IO_Driver_address_table[major] = *driver_table;
+  *registered_major               = major;
+
+  rtems_io_initialize( major, 0, NULL );
+
+  return RTEMS_SUCCESSFUL;
+}
diff --git a/cpukit/sapi/src/iounregisterdriver.c b/cpukit/sapi/src/iounregisterdriver.c
new file mode 100644
index 0000000000..5761138b09
--- /dev/null
+++ b/cpukit/sapi/src/iounregisterdriver.c
@@ -0,0 +1,48 @@
+/*
+ *  Input/Output Manager - Dynamically Unregister Device Driver
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/io.h>
+#include <string.h>
+
+/*
+ *  rtems_io_unregister_driver
+ *
+ *  Unregister a driver from the device driver table.
+ *
+ *  Input Paramters:
+ *    major            - device major number
+ *
+ *  Output Parameters:
+ *    RTEMS_SUCCESSFUL - if successful
+ *    error code       - if unsuccessful
+ */
+
+rtems_status_code rtems_io_unregister_driver(
+  rtems_device_major_number major
+)
+{
+  if ( major < _IO_Number_of_drivers ) {
+    memset(
+      &_IO_Driver_address_table[major],
+      0,
+      sizeof( rtems_driver_address_table )
+    );
+    return RTEMS_SUCCESSFUL;
+  }
+  return RTEMS_UNSATISFIED;
+}
diff --git a/cpukit/sapi/src/iowrite.c b/cpukit/sapi/src/iowrite.c
new file mode 100644
index 0000000000..9283404e73
--- /dev/null
+++ b/cpukit/sapi/src/iowrite.c
@@ -0,0 +1,48 @@
+/*
+ *  Input/Output Manager - Device Write
+ *
+ *  COPYRIGHT (c) 1989-2007.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/io.h>
+
+/*
+ *  rtems_io_write
+ *
+ *  This routine is the write directive of the IO manager.
+ *
+ *  Input Paramters:
+ *    major        - device driver number
+ *    minor        - device number
+ *    argument     - pointer to argument(s)
+ *
+ *  Output Parameters:
+ *    returns       - return code
+ */
+
+rtems_status_code rtems_io_write(
+  rtems_device_major_number  major,
+  rtems_device_minor_number  minor,
+  void                      *argument
+)
+{
+  rtems_device_driver_entry callout;
+
+  if ( major >= _IO_Number_of_drivers )
+    return RTEMS_INVALID_NUMBER;
+
+  callout = _IO_Driver_address_table[major].write_entry;
+  return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL;
+}