What are main issues while porting VxWorks code to Linux?

Moderately hard.


Yes.


I googled "Linux interrupt routines" and a large number of hits came up.
Why can't you do the same ?

snipped-for-privacy@yahoo.com writes:



http://www.ucdot.org/article.pl?sid05%/02/21/1139205&mode=thread
"Hi all, VxWorks-to-Linux migration kits are offered by a number of
companies, including MapuSoft, LynuxWorks, MontaVista, and TimeSys."

Porting VxWorks Applications to Linux
http://www.timesys.com/_content/media/docs/whitepapers/Porting%20VxWorks%20Applications%20to%20Linux.pdf

MontaVista Offers Easy VxWorks-To-Linux Transition; VxWorks 'virtual
machine' runs legacy embedded code on Linux platform
http://www.businesswire.com/webbox/bw.120700/203420332.htm

MontaVista aims tool at the heart of market leader, Wind River
http://www.linuxdevices.com/news/NS4335718546.html
"The new VxWorks-to-Linux tool kit presents applications with a
VxWorks "virtual machine" that emulates key system calls and behaviors
of the VxWorks kernel on a standard Linux platform. Basically, a
library of translations converts VxWorks application program
interfaces (APIs) into functions that are compatible with
Linux. MontaVista claims that source code utilizing VxWorks APIs can
often be recompiled and run on Linux after little or no modification,
other than minor changes to header files. According to Ready,
"programmers should be able to convert VxWorks-based applications into
ones that run on Hard Hat Linux in a handful of weeks."
Emulating and/or translating all of the approximately 1500 API
(application program interface) functions of VxWorks would have
presented a severe challenge. However, MontaVista developers
determined that it would be sufficient to limit their focus to roughly
fifty of the most commonly used VxWorks APIs."

Legacy2Linux - Porting Legacy RTOS Applications
http://legacy2linux.sourceforge.net/
"Legacy2Linux project provides emulation environments which implement
most of the core features of selected legacy RTOS kernels on a
standard Linux platform. The 'virtual machines' provided by these
emulation environments allow companies to test their existing legacy
code in an emulation environment, and provide a basis upon which to
build successful Linux ports of these applications."
There are kits available for both Wind River pSOS (R) and
Wind River VxWorks (R).

RTAI has a VxWorks skin, that should take more or less unmodified VxWorks
code and compile it.
I have not tried this myself, but take alook at rtai.org (RTAI HP) or
rtai.dk (RTAI wiki).