uefi-ref/edk2
1
0
Fork 0
mirror of https://github.com/tianocore/edk2 synced 2026-08-27 00:23:19 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

OvmfPkg/PlatformInitLib: detect physical address space

Browse source 
Try detect physical address space, when successful use it.
Otherwise go continue using the current guesswork code path.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Gerd Hoffmann 2022-10-04 15:47:26 +02:00 • committed by mergify[bot]
parent 8f9ef9c9a0
commit bbda386d25
1 changed files with 13 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

13
OvmfPkg/Library/PlatformInitLib/MemDetect.c
View file

@ -761,6 +761,19 @@ PlatformAddressWidthInitialization (
FirstNonAddress = PlatformGetFirstNonAddress (PlatformInfoHob);
}
PlatformAddressWidthFromCpuid (PlatformInfoHob, TRUE);
if (PlatformInfoHob->PhysMemAddressWidth != 0) {
// physical address width is known
PlatformInfoHob->FirstNonAddress = FirstNonAddress;
return;
}
//
// physical address width is NOT known
// -> do some guess work, mostly based on installed memory
// -> try be conservstibe to stay below the guaranteed minimum of
// 36 phys bits (aka 64 GB).
//
PhysMemAddressWidth = (UINT8)HighBitSet64 (FirstNonAddress);
//