答复: [edk2-devel] [edk2] DxeIpl : create page table, occupied too much memory range

["Tiger Liu(BJ-RD)" <tigerliu@zhaoxin.com>]

Hi, Laszlo:
Thanks for your reply!

Is Using PcdUse5LevelPageTable also a method to reduce paging table's memory requirement?

I find PcdUse1GPageTable's default value is false, why?

PcdUse5LevelPageTable's default value is true, and DxeIpl module will create 5-level paging for Dxe's long mode?

Best wishes,

-----邮件原件-----
发件人: Laszlo Ersek <lersek@redhat.com>
发送时间: 2019年9月17日 20:07
收件人: devel@edk2.groups.io; Tiger Liu(BJ-RD) <TigerLiu@zhaoxin.com>
主题: Re: [edk2-devel] [edk2] DxeIpl : create page table, occupied too much memory range

On 09/17/19 13:08, Tiger Liu(BJ-RD) wrote:
> Hi, Expert:
> I have a question about creating page table.
> If a CPU support 48bit physical address line, then creating page tables(Page size=2MB) will occupy too much memory region.
>
> Now, developer could only use PcdUse1GPageTable to avoid occupy too much memory region?

Not only. See <https://bugzilla.tianocore.org/show_bug.cgi?id=2008>.

Thanks
Laszlo


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