Re: [edk2-devel] 回复: [PATCH 1/3] MdePkg/BaseLib: Add support for ARMv8.5 RNG instructions

[Rebecca Cran]

On 4/28/21 7:08 PM, gaoliming wrote:
> Rebecca:
>    Can you submit one BZ for this new feature?

Create https://bugzilla.tianocore.org/show_bug.cgi?id=3368

>> +/**
>> +  Generates a random number using the RNDRRS instruction.
>> +
>> +  @param[out]  The generated random number
>> +
>> +  @retval TRUE  Success: a random number was successfully generated
>> +  @retval FALSE Failure: a random number was unable to be generated
>> +
>> +**/
>> +BOOLEAN
>> +EFIAPI
>> +ArmRndrrs (
>> +  OUT UINT64 *Rand
>> +  );
>> +
> 
> What usage is for this API ArmRndrrs()? I don't see it is used in RngLib.

It's not used at the moment, but it uses the RNDRRS instruction, which 
re-seeds the PRNG immediately before generating a random number.

-- 
Rebecca Cran


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