Re: [Minios-devel] About the IRQ framework of Unikraft

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Hi Wei,

On 03.12.18 08:14, Wei Chen (Arm Technology China) wrote:
> Hi,
>
> These days I am testing the multi-thread support patches on Arm64.
> But I find a problem about the IRQ framework. This framework can
> work properly for x86_64. But it can't work properly for Arm64
>
> static struct irq_handler_head irq_handlers[16];
>
> Here defined 16 irq_handlers, but on Arm64, most irq number
> Is higher than 16.
>
> So, in ukplat_irq_register:
> UK_SLIST_INSERT_HEAD(&irq_handlers[irq], h, entries);
> Will overflow.
Actually, this implementation needs an update anyways since at some 
point we want to have MSI and MSI-X support on x86. In this case the 
numbers are going to be much bigger. The current implementation was more 
a first draft to have something functional working.
Short question: Do you have an option to register a handler and an 
argument to the interrupt descriptor table on Arm? I guess you have one 
entry for each possible interrupt line number? How do other OSes on Arm 
deal with such big tables?
Thanks,

Simon

> Regards,
> Wei Chen
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