Re: [Qemu-devel] [PATCH v6 1/1] arm: add dummy v7 cp15 registers

[Mark Langsdorf <mark.langsdorf@calxeda.com>]

On 01/04/2012 11:50 AM, Peter Maydell wrote:
> On 4 January 2012 16:53, Mark Langsdorf <mark.langsdorf@calxeda.com> wrote:
>> +                } else if ((op1 == 0) && (op2 == 0)) {
>> +                /* power_control should be set to maximum latency. Again,
>> +                   default to 0 and set by private hook */
>> +                    return env->cp15.c15_power_control;
>> +                }
> 
> This one's read-write, which means it needs (a) support in set_cp15
> (b) save/load support.

Okay.

> You also need to implement the diagnostic register c15,c0,0,1
> otherwise Linux won't boot when it tries to run this code:
>  http://lxr.linux.no/#linux+v3.1.7/arch/arm/mm/proc-v7.S#L345
> I suggest that should be implemented as reads-as-written. (Again, will
> need save/load
> support.) Ditto for the power diagnostic control register c15,c0,0,2, as used in
> this patch: http://www.spinics.net/lists/arm-kernel/msg115817.html

I'm handling all the c15 registers listed on p 4-11 of the Cortex-A9
r3p0 TRM. Would you please give me a reference for these other two
registers? I'm not seeing them. Thanks.

--Mark