Re: [edk2-devel] EFI_SYSTEM_TABLE allocated by AllocateRuntimeCopyPool isn't aligned to 4KB

["Michael D Kinney" <michael.d.kinney@intel.com>]

Hi Rebecca,

I do not recall any statements in the EFI Spec that require 4KB
alignment of the UEFI System Table, Boot Services Table, 
or Runtime Services Table.

Mike

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Rebecca
> Cran
> Sent: Monday, January 22, 2024 11:53 AM
> To: devel@edk2.groups.io
> Subject: [edk2-devel] EFI_SYSTEM_TABLE allocated by
> AllocateRuntimeCopyPool isn't aligned to 4KB
> 
> I've been working on updating the T32 script EfiLoadDxe.cmm in
> EmbeddedPkg/Scripts/LauterbachT32 and one of the issues I've run into is
> that the EFI_SYSTEM_TABLE - pointed to by `gST` and `gDxeCoreST` - isn't
> aligned to 4KB like the script expects.
> 
> Instead, I'm seeing AllocateRuntimeCopyPool return 0xFB7D0018 in
> MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c:
> 
> //
> // Allocate the EFI System Table and EFI Runtime Service Table from
> EfiRuntimeServicesData
> // Use the templates to initialize the contents of the EFI System Table
> and EFI Runtime Services Table
> //
> gDxeCoreST = AllocateRuntimeCopyPool (sizeof (EFI_SYSTEM_TABLE),
> &mEfiSystemTableTemplate);
> ASSERT (gDxeCoreST != NULL);
> 
> I'm wondering which is wrong: should AllocateRuntimeCopyPool be
> returning a 4KB-aligned pointer, or is the script's assumption wrong?
> 
> 
> --
> Rebecca Cran
> 
> 
> 
> 
> 



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