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authorBrijesh Singh <brijesh.singh@amd.com>2017-07-06 09:26:50 -0400
committerJordan Justen <jordan.l.justen@intel.com>2017-07-10 21:17:27 -0700
commitc5d736eb6770ef80ab585aaf81fdf36ba5fd7607 (patch)
tree7dc13aaa1f6bbd94a51735d05b1ecce667e07fad
parent24e4ad75546b3c1f334aab7057f6c10309807d8d (diff)
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OvmfPkg: Introduce IoMmuAbsent Protocol GUID
Platforms that optionally provide an IOMMU protocol should do so by including a DXE driver (usually called IoMmuDxe) that produces either the IOMMU protocol -- if the underlying capabilities are available --, or gIoMmuAbsentProtocolGuid, to signal that the IOMMU capability detection completed with negative result (i.e., no IOMMU will be available in the system). In turn, DXE drivers (and library instances) that are supposed to use the IOMMU protocol if it is available should add the following to their DEPEX: gEdkiiIoMmuProtocolGuid OR gIoMmuAbsentProtocolGuid This ensures these client modules will only be dispatched after IOMMU detection completes (with positive or negative result). Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Leo Duran <leo.duran@amd.com> Contributed-under: TianoCore Contribution Agreement 1.0 Suggested-by: Jordan Justen <jordan.l.justen@intel.com> Suggested-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
-rw-r--r--OvmfPkg/OvmfPkg.dec1
1 files changed, 1 insertions, 0 deletions
diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index e5f74a1248..27bcfc141e 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -69,6 +69,7 @@
gBlockMmioProtocolGuid = {0x6b558ce3, 0x69e5, 0x4c67, {0xa6, 0x34, 0xf7, 0xfe, 0x72, 0xad, 0xbe, 0x84}}
gXenBusProtocolGuid = {0x3d3ca290, 0xb9a5, 0x11e3, {0xb7, 0x5d, 0xb8, 0xac, 0x6f, 0x7d, 0x65, 0xe6}}
gXenIoProtocolGuid = {0x6efac84f, 0x0ab0, 0x4747, {0x81, 0xbe, 0x85, 0x55, 0x62, 0x59, 0x04, 0x49}}
+ gIoMmuAbsentProtocolGuid = {0xf8775d50, 0x8abd, 0x4adf, {0x92, 0xac, 0x85, 0x3e, 0x51, 0xf6, 0xc8, 0xdc}}
[PcdsFixedAtBuild]
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvBase|0x0|UINT32|0