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

[Rebecca Cran]

On 5/4/21 3:06 PM, Sami Mujawar wrote:

>> +#if defined (MDE_CPU_AARCH64)
>> +
>> +/**
>> +  Reads the ID_AA64ISAR0 Register.
>> +
>> +  @return The contents of the ID_AA64ISAR0 Register
>> +
>> +**/
>> +UINT64
>> +EFIAPI
>> +ArmReadIdIsar0 (
>> +  VOID
>> +  );
>> +
> [SAMI] Should this function be part of ArmLib?
> [/SAMI]

It's currently used in BaseRngLib, and since there are other Aarch64 
functions in BaseLib I thought it should belong here - especially since 
I don't think MdePkg can depend on ArmPkg?

>> diff --git a/MdePkg/Library/BaseLib/BaseLibInternals.h 
>> b/MdePkg/Library/BaseLib/BaseLibInternals.h
>> index 6837d67d90cf..4ae79a4e7ab4 100644
>> --- a/MdePkg/Library/BaseLib/BaseLibInternals.h
>> +++ b/MdePkg/Library/BaseLib/BaseLibInternals.h
>> @@ -862,6 +862,12 @@ InternalX86RdRand64  (
>>     OUT     UINT64                    *Rand
>>     );
> [SAMI] I can see that the X86RdRand64 functions are implemented in this 
> library. However, I am not sure we want ArmRndr() and ArmRndrrs() in 
> BaseLib.
> I think these functions should be in BaseRngLib and should not be 
> available publicly. The RngLib interface should be used by edk2 modules. 
> What do you think?
> [/SAMI]
That makes sense - I'll move them.

-- 
Rebecca Cran


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