Change in edk2[master]: UefiPayloadPkg: Allow below 4GB memory

[Sean Rhodes (Code Review)]

Attention is currently required from: Sean Rhodes.
Hello Matt DeVillier,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/edk2/+/58802

to look at the new patch set (#2).

Change subject: UefiPayloadPkg: Allow below 4GB memory
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UefiPayloadPkg: Allow below 4GB memory

Add function to reserve memory below 4GB for EDKII Modules. This causes the
DXE to dispatch everything under 4GB and allows Operating System's that
require EFI_LOADED_IMAGE to be under 4GB to start.

e.g. Xen hypervisor used in Qubes

Signed-off-by: Sean Rhodes 
Change-Id: Ic600e08c9d46d0a291b8b119a3c268e432267cdf
---
M UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.c
M UefiPayloadPkg/UefiPayloadEntry/UefiPayloadEntry.inf
M UefiPayloadPkg/UefiPayloadPkg.dec
M UefiPayloadPkg/UefiPayloadPkg.dsc
4 files changed, 54 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/edk2 refs/changes/02/58802/2