[edk2-devel] [edk2-discuss] Need memory barriers in IoLib for AARCH64

[Wasim Khan]

Hello 

Any comments ?

> -----Original Message-----
> From: Wasim Khan
> Sent: Friday, July 10, 2020 6:20 PM
> To: michael.d.kinney at intel.com; liming.gao at intel.com; devel at edk2.groups.io
> Subject: [edk2-discuss] Need memory barriers in IoLib for AARCH64
> 
> Hello,
> 
> MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf:
> IoLib library uses IoLibArm.c for AARCH64/ARM architecture and IoLib.c for
> other architectures.
> 
> While IoLib.c already has memory barriers in MmioWrite functions, there
> barriers are missing in IoLibArm.c Is there any reason for **not** adding these
> memory barriers in IoLibArm.c to guarantee that all MMIO operations are
> serialized ?
> 
> I am facing some issues and I need to add memory barriers in IoLibArm.c for
> AARCH64 also .
> 
> 
> Regards,
> Wasim


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