Hi Gerd,


Thanks,
Chao
On 2024/4/25 15:53, Gerd Hoffmann wrote:
>    Hi,
>
>> +UINTN  mFwCfgSelectorAddress;
>> +UINTN  mFwCfgDataAddress;
>> +UINTN  mFwCfgDmaAddress;
> Hmm, global variables for PEI?  I think the point of storing these in
> the HOB is to avoid the need for global variables?  Also does that work
> when running PEI in-place from flash?
I think it would be useful if some platforms(not LoongArch) could use 
the global variables in PEI, because the global variables are faster.
>
>> +RETURN_STATUS
>> +EFIAPI
>> +QemuFwCfgInitialize (
>> +  VOID
>> +  )
>> +{
>> +  VOID          *DeviceTreeBase;
>> +  INT32         Node;
>> +  INT32         Prev;
>> +  CONST CHAR8   *Type;
>> +  INT32         Len;
>> +  CONST UINT64  *Reg;
>> +  UINT64        FwCfgSelectorAddress;
>> +  UINT64        FwCfgSelectorSize;
>> +  UINT64        FwCfgDataAddress;
>> +  UINT64        FwCfgDataSize;
>> +  UINT64        FwCfgDmaAddress;
>> +  UINT64        FwCfgDmaSize;
> First thing this function should do is check whenever the HOB already
> exists.  Should that be the case there is no need to parse the device
> tree.
This is a constructor in PEI, that has to parse the device tree and then 
build the HOBs.
>
> take care,
>    Gerd
>
>
>
> 
>


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