Hi Gerd,

Part 2 has been be merged, I'm separating  this Lib into two serve the 
PEI stage and DXE stage.

Currently, This DXE library uses three global variables, and when I 
simulate the no-mmio version: MmioLib.c + Dxe.c + Pei.c, I can abstract 
some helper functions as the public functions in Mmio version.

Do you mind if I replace these three vaiables with three dynamically 
typed PCDs? If so, the PEI and DXE stage libraries can using  some of 
the same APIs.


Thanks,
Chao
On 2024/3/21 20:27, Chao Li wrote:
>
> Hi Gerd,
>
> On 2024/3/21 19:39, Gerd Hoffmann wrote:
>>    Hi,
>>
>>> QemuFwCfgLibMmio.inf is looks like a DXE stage library, while this patch is
>>> the PEI stage library we are dicussing.
>>>
>>> I have tow plans:
>>>
>>> *Plan A:* Keep this library under LoongArchQemuVirt.
>>>
>>> *Plan  B:* Create a new INF named QemuFwCfgPeiLibMmio.inf under
>>> OvmfPkg/Library/QemuFwCfgLib/, which will obtain the resources from FDT, and
>>> store them in the HOB or dynamic PCD.
>>>
>>> Which one do you like? I'm leaning toward B because more people will be
>>> served if it's under OvmfPkg/Library.
>> Yes, Plan (b) is better.  Also try avoid code duplication.  The existing
>> code can be splitted into two files.  Move the code which works in DXE
>> only (i.e. the bits using FdtClientProtocol to find the fw_cfg mmio
>> address, maybe more) to QemuFwCfgLibMmioDxe.c, keep the code which can
>> work for both PEI and DXE in QemuFwCfgLibMmio.c.  Add
>> QemuFwCfgLibMmioPei.c for the PEI-specific code.
>>
>> The ioport version of the library uses the same approach with
>> QemuFwCfgLib.c + QemuFwCfgDxe.c + QemuFwCfgPei.c
> OK, I'm going to do the plan B next and commit it with the next 
> version, which will probably be called "Part 3 patch set, enable 
> LoongArchVirtQemu in OvmfPkg".
>> take care,
>>    Gerd
>>
>>
>>
>>
>>
> 


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