[fpc-pascal] Linux Kernel and FPC

[ik]

On 7/9/07, Alain Michaud <Alain.Michaud at nrc-cnrc.gc.ca> wrote:
> Hi,
>
>   last year I have written a very small driver using the "char" model,
> ie. that is put in src/linux/drivers/char something very simple to
> read/write a few bytes on an output port. I would have been glad to
> write it in pascal, but I do not think it would be possible at all. I
> finally did it this way:
>
>  -- The "kernel" part is written in C/asm but the code is as simple as
> possible
>
>   -- The "user" part is written in FPC
>
>   -- The interface to the kernel is done using a few functions thru
> IOCTL interface.
>
> Now, why not doing the kernel part in FPC?
>
>    Well, The .h files that you need to translate to the interface
> section of your unit are very long and difficult to understand. Plus
> they contain some macro definitions which are platform specfic.
>
>      For example if you use the ASM instruction "outb" to write one byte
> on  a port in your driver source code you would use "_outb" which in
> fact is a macro specially tuned for your platform !!  The same is true
> for most procedure or instructions that you use when when programming in
> kernel space. Even a simple "move" instruction has to be "spinlocked"
>
>   In conclusion, I gave up ! It is so simple to adapt an example from a
> C textbook and although I do not know any C at all I could write to my
> I/O port whitin a fey days.
>
> Good luck
>
> Alain
>
>
>
>
>
>
>
>
> On Fri, 2007-07-06 at 23:05 +0300, ik wrote:
> > Hi,
> >
> > I have found the following guide:
> > http://www.linuxdevcenter.com/pub/a/linux/2007/07/05/devhelloworld-a-simple-introduction-to-device-drivers-under-linux.html
> >
> > And I was thinking in implementing it using FPC.
> > My question is, how hard can it be ?
> > Are there any kernel modules that already been binded into FPC ? such
> > as th ones that will give me printk ?
> >
> > Are there any known examples of someone that already made a Linux
> > kernel module using FPC ?
> >
> > Thanks,
> > Ido
>

The more I read about it, the more I believe that I need more time to
implement my freePOS FPC based kernel rather then to use Linux one...
The problem is that I do not have time, and only papers for memory
management system that I wish to implement as the first part...

-- 
http://ik.homelinux.org/