Re: [Xen-devel] Hypervisor crash setting up GIC (arm32)

[Thomas Leonard <talex5@xxxxxxxxx>]

On 22 April 2014 15:11, Thomas Leonard <talex5@xxxxxxxxx> wrote:
> Hi guys,
>
> I've got a bit further and I'm now trying to get Mini-OS to handle
> interrupts.  [...] my IRQ handler keeps being called (continuously)
> with spurious interrupts (interrupt 1023). If anyone knows what might cause 
> that, let me know!

For reference, the problem here was this code:

    gic_disable_interrupts(&gic);
    gic_cpu_set_priority(&gic, 0xff);
    gic_enable_interrupt(&gic, EVENTS_IRQ /* interrupt number */, 0x1
/*cpu_set*/, 1 /*level_sensitive*/, 0 /* ppi */);
    gic_enable_interrupt(&gic, VIRTUALTIMER_IRQ /* interrupt number
*/, 0x1 /*cpu_set*/, 1 /*level_sensitive*/, 1 /* ppi */);
    gic_enable_interrupts(&gic);

As soon as EVENTS_IRQ was enabled in gic_enable_interrupt, the IRQ
handler got called continuously with spurious interrupts and no
progress could be made.

The solution is to call gic_enable_interrupts *before* enabling the
individual interrupts.

The patch is on my Mini-OS branch here:

  https://github.com/talex5/xen/tree/minios-arm-port


-- 
Dr Thomas Leonard        http://0install.net/
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