[Qemu-devel] Generating external interrupt on PPC bare metal code

[Wu, Michael Y [US] (MS)]

Hi,

I am attempting to generate an external interrupt from bare metal code I've 
written. The system I am emulating is something I've developed on my own for 
experimentation. The system has a very simple interrupt controller that I've 
written which would call qemu_set_irq() when a certain memory address is 
written into. The program running on the system simply writes into that memory 
address to set off the interrupt.

The program running performs as expected and qemu_set_irq() is called. I turned 
on the interrupt log messages to see what I was getting:
ppc6xx_set_irq: env 0x7f93319cc290 pin 5 level 1
ppc6xx_set_irq: set the external IRQ state to 1
ppc_set_irq: 0x7f93319cc290 n_IRQ 3 level 1 => pending 00000008req 00000002

It seems like the internal QEMU interrupt handler is being called but the 
interrupt is not jumping to the desired external interrupt address. I am 
currently using GDB to determine if the interrupt is set off or not. I've also 
made sure that my bare metal program enables external interrupt bit in the 
machine state register. Any suggestions or advice would be great.

Thanks!