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Re: [Qemu-devel] OpenRISC - SPR_PICMR always 'OR-ing' the values

From: Stafford Horne
Subject: Re: [Qemu-devel] OpenRISC - SPR_PICMR always 'OR-ing' the values
Date: Sun, 1 Jul 2018 17:18:03 +0900


We have been working on a few patches to fixed QEMU for OpenRISC and I
included the change for picmr writes, richard added some changes to
SPR writes which might help with the masking/umasking work more

If you want to try them out could you check:

Thanks for your help.


On Sun, May 20, 2018 at 12:32 PM Davidson Francis
<address@hidden> wrote:
> Thank you for quick reply,
> Yes, I've tried, after that, the register works as expected, but even so, if I
> enable the interrupts right after, I still receive interrupts from the same 
> IRQ,
> but maybe there is something wrong with my code.
> Regards,
> Davidson Francis.
> 2018-05-19 23:54 GMT-03:00 Stafford Horne <address@hidden>:
> > On Sat, May 19, 2018 at 08:08:47PM -0300, Davidson Francis wrote:
> >> Hello Stafford,
> >>
> >> I'm currently using or1k as a target CPU in an operating system that
> >> I'm working.
> >> It happens that I'm having some issues regarding the PICMR register: I 
> >> realize
> >> that in the latest Qemu version (2.12) when I write into PICMR, the Qemu is
> >> actually 'OR-ing' the values (as I could note in 
> >> target/openrisc/sys_helper.c
> >> file), so I can't mask an already enabled interrupt.
> >>
> >> I don't know if this behaviour is expected and if so, I'm sorry, but this 
> >> does
> >> not occurs in the or1ksim, so I thought this could be might an issue.
> >
> > Hello, thanks for pointing this out.  It looks wrong to me too.  Have you 
> > tested
> > changing it to just `env->picmr = rb;`?
> >
> > -Stafford

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