[PATCH 4/4] OvmfPkg/Bhyve: use static PCI32Base address

It's neccessary to allocate a Graphics Stolen Memory area to enable
GPU-Passthrough for integrated Intel GPUs. Therefore, use a new
memory layout with a static Pci32Baseaddress.

Old layout:
	[...        , lowmemlimit] RAM
	[lowmemlimit, 0xE000 0000] PCI Space
New layout:
	[...        , lowmemlimit] RAM
	[lowmemlimit, gsmbase    ] Memory hole (may be absent)
	[gsmbase    , 0xC000 0000] GSM (may be absent)
	[0xC000 0000, 0xE000 0000] PCI Space

Signed-off-by: Corvin Köhne <c.koehne@beckhoff.com>
---
 OvmfPkg/Bhyve/BhyveX64.dsc           | 4 ++--
 OvmfPkg/Bhyve/PlatformPei/Platform.c | 4 +++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/OvmfPkg/Bhyve/BhyveX64.dsc b/OvmfPkg/Bhyve/BhyveX64.dsc
index c35bf18449..e5d1dbccff 100644
--- a/OvmfPkg/Bhyve/BhyveX64.dsc
+++ b/OvmfPkg/Bhyve/BhyveX64.dsc
@@ -537,8 +537,8 @@
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId|0
   gUefiOvmfPkgTokenSpaceGuid.PcdPciIoBase|0x0
   gUefiOvmfPkgTokenSpaceGuid.PcdPciIoSize|0x0
-  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Base|0x0
-  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Size|0x0
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Base|0xC0000000
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Size|0x20000000
   gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Base|0x0
   gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size|0x800000000
 
diff --git a/OvmfPkg/Bhyve/PlatformPei/Platform.c b/OvmfPkg/Bhyve/PlatformPei/Platform.c
index 3a414ffcb7..f38e74ccfc 100644
--- a/OvmfPkg/Bhyve/PlatformPei/Platform.c
+++ b/OvmfPkg/Bhyve/PlatformPei/Platform.c
@@ -191,7 +191,9 @@ MemMapInitialization (
       ASSERT (PciExBarBase <= MAX_UINT32 - SIZE_256MB);
       PciBase = (UINT32)(PciExBarBase + SIZE_256MB);
     } else {
-      PciBase = (TopOfLowRam < BASE_2GB) ? BASE_2GB : TopOfLowRam;
+      PciBase = PcdGet64(PcdPciMmio32Base);
+      if (PciBase == 0)
+        PciBase = (TopOfLowRam < BASE_2GB) ? BASE_2GB : TopOfLowRam;
     }
 
     //
-- 
2.11.0

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