* [Adeos-main] hw interrupts off, __ipipe_handle_irq
@ 2010-01-19 13:13 A C
2010-01-20 11:55 ` Gilles Chanteperdrix
0 siblings, 1 reply; 2+ messages in thread
From: A C @ 2010-01-19 13:13 UTC (permalink / raw)
To: adeos
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Hello,
in the comment before the definition of the function __ipipe_handle_irq(), it is written : "hw interrupts are off on entry". For the isr of the nios2, is it done (disable hw interrupts) in entry.s or in __ipipe_grab_irq() ? In fact, we do not find where it is done.
Regards
Adrien Chiron & Vincent Vanbesien
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* Re: [Adeos-main] hw interrupts off, __ipipe_handle_irq
2010-01-19 13:13 [Adeos-main] hw interrupts off, __ipipe_handle_irq A C
@ 2010-01-20 11:55 ` Gilles Chanteperdrix
0 siblings, 0 replies; 2+ messages in thread
From: Gilles Chanteperdrix @ 2010-01-20 11:55 UTC (permalink / raw)
To: A C; +Cc: adeos
A C wrote:
> Hello, in the comment before the definition of the function
> __ipipe_handle_irq(), it is written : "hw interrupts are off on
> entry". For the isr of the nios2, is it done (disable hw interrupts)
> in entry.s or in __ipipe_grab_irq() ? In fact, we do not find where
> it is done. Regards Adrien Chiron & Vincent Vanbesien
That is standard behaviour for a processor to enter interrupt handling
code with interrupts disabled somehow. Otherwise, for level interrupts,
you would get an infinite loop. So, what you should look for in entry.S
are the points where interrupts are re-enabled, because this code is
entered with irqs off, mostly.
--
Gilles.
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2010-01-19 13:13 [Adeos-main] hw interrupts off, __ipipe_handle_irq A C
2010-01-20 11:55 ` Gilles Chanteperdrix
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