From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <458109F6.1020708@domain.hid>
Date: Thu, 14 Dec 2006 09:23:18 +0100
From: Wolfgang Grandegger <wg@domain.hid>
MIME-Version: 1.0
Subject: Re: [Xenomai-help] Handling a interrupt from user space on PPC405
References: <200612132315.54899.niklaus.giger@domain.hid>
	<4580F7B2.8060600@domain.hid>
In-Reply-To: <4580F7B2.8060600@domain.hid>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
List-Id: Help regarding installation and common use of Xenomai
	<xenomai.xenomai.org>
List-Unsubscribe: <https://mail.gna.org/listinfo/xenomai-help>,
	<mailto:xenomai-help-request@domain.hid>
List-Archive: </public/xenomai-help>
List-Post: <mailto:xenomai@xenomai.org>
List-Help: <mailto:xenomai-help-request@domain.hid>
List-Subscribe: <https://mail.gna.org/listinfo/xenomai-help>,
	<mailto:xenomai-help-request@domain.hid>
To: Heikki Lindholm <holindho@domain.hid>
Cc: xenomai@xenomai.org

Heikki Lindholm wrote:
> Niklaus Giger kirjoitti:
>> Hi
>>
>> I tried to use the FIT (Fixed Interrupt Timer) on my PPC405GPr board, 
>> which uses 0x1010 as its interrupt vector in a user space 
>> (vxworks-skin) application.
>> <..>
>>   RT_INTR FITnterrupt;
>>   res = rt_intr_create(&FITnterrupt, 0, 0x1010, I_NOAUTOENA);
>> <..>
>> But I got -22 EINVAL as error.
>> Could somebody please tell me, what is wrong with my example.
> 
> The 0x1010 is the HW interrupt vector, but the argument should be the 
> interrupt _line_. Besides, last time I checked, the ppc405 FIT isn't 
> even 'wired' in the kernel; actually, there's no space for the interrupt 
> prologue code, which basically results that no handler is called when 
> the FIT interrupt occurs.

Yes, in head_4xx.c there is the following note:

   /* NOTE:
    * FIT and WDT handlers are not implemented yet.
    */

But the relevant code could be copied from the PIT interrupt.

   /* 0x1000 - Programmable Interval Timer (PIT) Exception */
         START_EXCEPTION(0x1000, Decrementer)
         NORMAL_EXCEPTION_PROLOG
         lis     r0,TSR_PIS@h
         mtspr   SPRN_TSR,r0             /* Clear the PIT exception */
         addi    r3,r1,STACK_FRAME_OVERHEAD
   #ifdef CONFIG_IPIPE
         EXC_XFER_IPIPE(0x1000, __ipipe_grab_timer)
   #else /* !CONFIG_IPIPE */
         EXC_XFER_LITE(0x1000, timer_interrupt)
   #endif /* CONFIG_IPIPE */

and modified accordingly.

Wolfgang.


Wolfgang.