[PATCH v1 2/5] arm64: add ARMv8.2 id_aa64mmfr2 boiler plate

[james.morse@arm.com (James Morse)]

Hi Suzuki,

On 03/02/16 12:12, Suzuki K. Poulose wrote:
> On 02/02/16 17:03, James Morse wrote:
>> ARMv8.2 adds a new feature register id_aa64mmfr2. This patch adds the
>> cpu feature boiler plate used by the actual features in later patches.
>>
>> Signed-off-by: James Morse <james.morse@arm.com>
> 
> 
>>   #define SYS_CNTFRQ_EL0            sys_reg(3, 3, 14, 0, 0)
>>   #define SYS_CTR_EL0            sys_reg(3, 3, 0, 0, 1)
>> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
>> index a84febc40db2..a4f665f95f9f 100644
>> --- a/arch/arm64/kernel/cpufeature.c
>> +++ b/arch/arm64/kernel/cpufeature.c
>> @@ -123,6 +123,10 @@ static struct arm64_ftr_bits ftr_id_aa64mmfr1[] = {
>>       ARM64_FTR_END,
>>   };
>>
>> +static struct arm64_ftr_bits ftr_id_aa64mmfr2[] = {
>> +    ARM64_FTR_END,
> 
> It will be good to see all the defined fields in id_aa64mmfr2 added here in
> this patch. You could also move the definition of UA0 field from the next patch
> to here.

Okay, what are the rules for unsupported features?

UAO support isn't added until a later patch, I assumed it was best to add the
definition as part of that patch.

> 
> Otherwise looks good.
> 
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>

Thanks,

James