RTEMS I/O manager

[jennifer at oarcorp.com]

For an example in the 4.7 branch see
...rtems/c/src/libnetworking/ppd/example/system.h

Jennifer Averett



> Hi!
>
> So, if I want my driver to implement its own open(), close(), read(),
> write(), init() and ioctl() functions, I have to define
> CONFIGURE_HAS_OWN_DEVICE_DRIVER_TABLE?
> How does it work? Do I have to instantiate an additional struct
> rtems_driver_address_table and fill in the appropriate addresses?
> I searched for an example, but I didn't find anythink.
>
> Kind regards,
>   Hank
>
> Quoting Joel Sherrill <joel.sherrill at oarcorp.com>:
>
>> hwulf at et-inf.fho-emden.de wrote:
>>> Dear ladies and gentlemen,
>>>
>>> I'm trying to understand the inner workings of the RTEMS I/O manager.
>>> In the function rtems_io_initialize() in the source code file io.c
>>> there's called an initialization routine. But where is the assignment
>>> of this initialization routine (the assignment of
>>> _IO_Driver_address_table[major].initialization) ?
>>>
>> It is part of RTEMS Configuration and is normally done using
>> rtems/confdefs.h.  See
>>
>> http://www.rtems.com/onlinedocs/releases/rtemsdocs-4.7.1/share/rtems/html/c_user/c_user00377.html
>>> Thank you very much and kind regards,
>>>  Hank
>>>
>>> Source code for rtems_io_initialize():
>>> ======================================
>>> 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;
>>>     return callout ? callout(major, minor, argument) :
>>> RTEMS_SUCCESSFUL;
>>> }
>>> _______________________________________________
>>> rtems-users mailing list
>>> rtems-users at rtems.com
>>> http://rtems.rtems.org/mailman/listinfo/rtems-users
>>>
>
>
>
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