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

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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3
OvmfPkg/OvmfPkg.dec
View File

@ -218,6 +218,9 @@
# The value should be a multiple of 4KB.
gUefiOvmfPkgTokenSpaceGuid.PcdHighPmmMemorySize|0x400000|UINT32|0x31
gUefiOvmfPkgTokenSpaceGuid.PcdXenPvhStartOfDayStructPtr|0x0|UINT32|0x17
gUefiOvmfPkgTokenSpaceGuid.PcdXenPvhStartOfDayStructPtrSize|0x0|UINT32|0x32
[PcdsDynamic, PcdsDynamicEx]
gUefiOvmfPkgTokenSpaceGuid.PcdEmuVariableEvent|0|UINT64|2
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashVariablesEnable|FALSE|BOOLEAN|0x10

4
OvmfPkg/OvmfXen.fdf
View File

@ -172,6 +172,10 @@ gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageBase|gUefiOvmfPkgTokenSpaceGuid.
0x007000|0x001000
gEfiMdePkgTokenSpaceGuid.PcdGuidedExtractHandlerTableAddress|gUefiOvmfPkgTokenSpaceGuid.PcdGuidedExtractHandlerTableSize
0x008000|0x001000
# Used by XenResetVector to communicate with XenPlatformPei
gUefiOvmfPkgTokenSpaceGuid.PcdXenPvhStartOfDayStructPtr|gUefiOvmfPkgTokenSpaceGuid.PcdXenPvhStartOfDayStructPtrSize
0x010000|0x010000
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamSize

6
OvmfPkg/XenResetVector/Ia32/XenPVHMain.asm
View File

@ -22,6 +22,12 @@ xenPVHMain:
;
xor esp, esp
;
; Store "Start of day" struct pointer for later use
;
mov dword[PVH_SPACE (0)], ebx
mov dword[PVH_SPACE (4)], 'XPVH'
mov ebx, ADDR_OF(gdtr)
lgdt [ebx]

3
OvmfPkg/XenResetVector/XenResetVector.inf
View File

@ -36,3 +36,6 @@
[Pcd]
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesBase
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesSize
gUefiOvmfPkgTokenSpaceGuid.PcdXenPvhStartOfDayStructPtr
gUefiOvmfPkgTokenSpaceGuid.PcdXenPvhStartOfDayStructPtrSize

2
OvmfPkg/XenResetVector/XenResetVector.nasmb
View File

@ -34,6 +34,8 @@
%include "CommonMacros.inc"
%define PVH_SPACE(Offset) (FixedPcdGet32 (PcdXenPvhStartOfDayStructPtr) + (Offset))
%include "PostCodes.inc"
%ifdef DEBUG_PORT80