Newbie question to i/o

Wolfram Wadepohl W.Wadepohl at
Mon Feb 25 07:36:26 UTC 2002


having a background of realtime systems like MTOS and VMS and now in the
RTEMS community to write i/o drivers i've a question.

the systems i know allocated a piece of static storage to all major
(device) and minor (unit) instances of a device driver. if an interrupt
was connected to the device the systems interrupthandler setup a pointer
for the static data area of that device. currently i've no idea how to
setup a static data area for every minor device and have a pointer
defined to this area when the interrupt service routine is entered.

can anybody please explain the mechanisms behind the screnn to me and
all other who don't know? thank you very much.

Schöne Grüße aus Reutlingen

Wolfram Wadepohl

Transport- und Lagersysteme
Dieselstraße 6
D-72770 Reutlingen - Betzingen

Tel.  +49 (0)71 21/5 14-2 89
Fax   +49 (0)71 21/5 14-2 99
eMail W.Wadepohl at

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