[OpenBIOS] Solaris 8: ESP device enumeration issue

Mark Cave-Ayland mark.cave-ayland at siriusit.co.uk
Sun Feb 20 21:28:57 CET 2011

On 20/02/11 15:27, Mark Cave-Ayland wrote:

> So it seems to be this setting of the PSR register which is causing the
> fatal trap.

Some more hacking around with gdb on qemu shows that actually in fact, 
the spurious interrupts being generated are not related to the DMA 
transfers but have exception_index 0x1f which translates to IRQ 15.

Searching on the internet seems to suggest that IRQ 15 is used for 
distributing interrupts on multi-processor systems - so perhaps it is 
related to OpenBIOS' SMP setup? With a conditional breakpoint, I can see 
that they only start appearing upon activation of the first DMA transfer 
initiated by the Solaris kernel.



Mark Cave-Ayland - Senior Technical Architect
PostgreSQL - PostGIS
Sirius Corporation plc - control through freedom
t: +44 870 608 0063

Sirius Labs: http://www.siriusit.co.uk/labs

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