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OvmfPkg/XenResetVector: Saving start of day pointer for PVH guests

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As described in the Xen PVH documentation [1], "ebx: contains the
physical memory address where the loader has placed the boot start info
structure". To have this pointer saved to be able to use it later in the
PEI phase, we allocate some space in the MEMFD for it. We use 'XPVH' as
a signature (for "Xen PVH").

[1] https://xenbits.xenproject.org/docs/unstable/misc/pvh.html

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190813113119.14804-8-anthony.perard@citrix.com>
This commit is contained in:
Anthony PERARD
2019-08-13 12:30:51 +01:00
committed by Laszlo Ersek
parent a8c791c15b
commit 93314ae597
5 changed files with 18 additions and 0 deletions
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2
OvmfPkg/XenResetVector/XenResetVector.nasmb
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@@ -34,6 +34,8 @@
%include "CommonMacros.inc"
%define PVH_SPACE(Offset) (FixedPcdGet32 (PcdXenPvhStartOfDayStructPtr) + (Offset))
%include "PostCodes.inc"
%ifdef DEBUG_PORT80