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 Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Anthony PERARD <anthony.per...@citrix.com> --- OvmfPkg/OvmfPkg.dec | 4 ++++ OvmfPkg/XenOvmf.fdf | 4 ++++ OvmfPkg/XenResetVector/XenResetVector.inf | 3 +++ OvmfPkg/XenResetVector/Ia32/XenPVHMain.asm | 4 ++++ OvmfPkg/XenResetVector/XenResetVector.nasmb | 2 ++ 5 files changed, 17 insertions(+) diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec index e50c6179a2..1cbbc49a6b 100644 --- a/OvmfPkg/OvmfPkg.dec +++ b/OvmfPkg/OvmfPkg.dec @@ -127,6 +127,10 @@ [PcdsFixedAtBuild] gUefiOvmfPkgTokenSpaceGuid.PcdGuidedExtractHandlerTableSize|0x0|UINT32|0x1a gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDecompressionScratchEnd|0x0|UINT32|0x1f + # Used by XenOvmf + gUefiOvmfPkgTokenSpaceGuid.PcdXenStartOfDayStructPtr|0x0|UINT32|0x30 + gUefiOvmfPkgTokenSpaceGuid.PcdXenStartOfDayStructPtrSize|0x0|UINT32|0x31 + [PcdsDynamic, PcdsDynamicEx] gUefiOvmfPkgTokenSpaceGuid.PcdEmuVariableEvent|0|UINT64|2 gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashVariablesEnable|FALSE|BOOLEAN|0x10 diff --git a/OvmfPkg/XenOvmf.fdf b/OvmfPkg/XenOvmf.fdf index 20ebacd673..f9e58befd6 100644 --- a/OvmfPkg/XenOvmf.fdf +++ b/OvmfPkg/XenOvmf.fdf @@ -159,6 +159,10 @@ [FD.MEMFD] 0x007000|0x001000 gEfiMdePkgTokenSpaceGuid.PcdGuidedExtractHandlerTableAddress|gUefiOvmfPkgTokenSpaceGuid.PcdGuidedExtractHandlerTableSize +0x008000|0x001000 +# Used by XenResetVector to communicate with XenPlatformPei +gUefiOvmfPkgTokenSpaceGuid.PcdXenStartOfDayStructPtr|gUefiOvmfPkgTokenSpaceGuid.PcdXenStartOfDayStructPtrSize + 0x010000|0x010000 gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamSize diff --git a/OvmfPkg/XenResetVector/XenResetVector.inf b/OvmfPkg/XenResetVector/XenResetVector.inf index 5c05f02285..ec98c17876 100644 --- a/OvmfPkg/XenResetVector/XenResetVector.inf +++ b/OvmfPkg/XenResetVector/XenResetVector.inf @@ -41,3 +41,6 @@ [BuildOptions] [Pcd] gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesBase gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesSize + + gUefiOvmfPkgTokenSpaceGuid.PcdXenStartOfDayStructPtr + gUefiOvmfPkgTokenSpaceGuid.PcdXenStartOfDayStructPtrSize diff --git a/OvmfPkg/XenResetVector/Ia32/XenPVHMain.asm b/OvmfPkg/XenResetVector/Ia32/XenPVHMain.asm index c4802bf4d1..4e55b0ac1f 100644 --- a/OvmfPkg/XenResetVector/Ia32/XenPVHMain.asm +++ b/OvmfPkg/XenResetVector/Ia32/XenPVHMain.asm @@ -22,6 +22,10 @@ xenPVHMain: ; ESP - Initial value of the EAX register (BIST: Built-in Self Test) mov esp, eax + ;; Store "Start of day" struct pointer for later use + mov dword[PVH_SPACE (0)], ebx + mov dword[PVH_SPACE (4)], 'XPVH' + cli mov ebx, ADDR_OF(gdtr) diff --git a/OvmfPkg/XenResetVector/XenResetVector.nasmb b/OvmfPkg/XenResetVector/XenResetVector.nasmb index d5a791c139..50cb81fcd1 100644 --- a/OvmfPkg/XenResetVector/XenResetVector.nasmb +++ b/OvmfPkg/XenResetVector/XenResetVector.nasmb @@ -41,6 +41,8 @@ %include "CommonMacros.inc" +%define PVH_SPACE(Offset) (FixedPcdGet32 (PcdXenStartOfDayStructPtr) + (Offset)) + %include "PostCodes.inc" %ifdef DEBUG_PORT80 -- Anthony PERARD -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#38713): https://edk2.groups.io/g/devel/message/38713 Mute This Topic: https://groups.io/mt/30997889/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
