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Date: Wed, 16 Oct 2013 13:06:47 +0200
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Subject: Re: [Qemu-devel] Should the i8259 devices remain no-user?
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To: Markus Armbruster <armbru@redhat.com>
Cc: qemu-devel@nongnu.org, Anthony Liguori <aliguori@amazon.com>, =?ISO-8859-1?Q?Andreas_F=E4rber?= <afaerber@suse.de>

Il 16/10/2013 11:51, Markus Armbruster ha scritto:
> Let me try to elaborate, to make sure I understand.
> 
> Unlike ordinary ISA devices, the i8259 devices need additional wiring,
> done by code.
> 
> For instance, board code like pc_q35_init(), pc_piix.c's pc_init1(),
> mips_malta_init(), ... wire up their IRQ input lines.  The slave's IRQ
> output line is wired to the master's IRQ2 in hw/intc/i8259.c for
> isa-i8259, and the kernel for kvm-i8259.  The master's IRQ output line
> is wired up by board code (it's complicated).
> 
> Correct?  If yes, I can turn it into a suitable comment.

The wiring of the slave to the master is hardcoded into i8259 code.

The wiring of all 16 lines is set up by board code.

Paolo