On Wed, Jan 18, 2023 at 09:23:48AM +0800, Zhiguang Liu wrote:
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4246
> 
> In function InitPaging, NumberOfPml5Entries is calculated by below code
> NumberOfPml5Entries = (UINTN)LShiftU64 (1, SizeOfMemorySpace - 48);
> If the SizeOfMemorySpace is larger than 48, NumberOfPml5Entries will be
> larger than 1. However, this doesn't make sense if the hardware doesn't
> support 5 level page table.

... if 5-level paging is not used.

Hardware which does not support 5-level paging is limited to 48 anyway.

This still does not explain why this fixes code hangs.

take care,
  Gerd



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