Re: Why ack interrupt before calling handler?

On Wed, 2003-06-11 at 14:39, Kent Borg wrote:

On Wed, Jun 11, 2003 at 12:33:42PM +0200, Kenneth Johansson wrote:

Finally the interrupt end gets called, which acks and enables the
interrupt.  This ack actually does something for me.

Hopefully this ack only happens if the interrupt is level triggered
otherwise you have a problem.

I am thinking that the general purpose PPC code does the early
ack for edge-triggered circumstances.  For latched level-triggered
cases there is no harm in the extra early ack.

Thats right.

--
Kenneth Johansson
Ericsson AB                       Tel: +46 8 719 70 20
Tellusborgsvägen  90              Fax: +46 8 719 29 45
126 25 Stockholm                  ken@switchboard.ericsson.se


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