OvmfPkg: introduce XenMemMapInitialization

This function parses Xen OVMF info and arrange memory maps accordingly.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wei Liu <wei.liu2@citrix.com>

diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index 9b7828f8dccba4a26d8f211f92ec6e1856928a8a..c2e7ba99ff16c500502c936f0daf39afc50e6d2e 100644 (file)
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -34,6 +34,10 @@
 #include <Guid/MemoryTypeInformation.h>\r
 #include <Ppi/MasterBootMode.h>\r
 #include <IndustryStandard/Pci22.h>\r
+#include <Guid/XenInfo.h>\r
+#include <IndustryStandard/E820.h>\r
+#include <Library/ResourcePublicationLib.h>\r
+#include <Library/MtrrLib.h>\r
 \r
 #include "Platform.h"\r
 #include "Cmos.h"\r
@@ -163,6 +167,72 @@ AddUntestedMemoryRangeHob (
   AddUntestedMemoryBaseSizeHob (MemoryBase, (UINT64)(MemoryLimit - MemoryBase));\r
 }\r
 \r
+VOID\r
+XenMemMapInitialization (\r
+  VOID\r
+  )\r
+{\r
+  EFI_HOB_GUID_TYPE *GuidHob;\r
+  EFI_XEN_INFO *Info;\r
+\r
+  DEBUG ((EFI_D_ERROR, "Using memory map provided by Xen\n"));\r
+\r
+  GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);\r
+\r
+  ASSERT (GuidHob != NULL);\r
+\r
+  Info = GET_GUID_HOB_DATA (GuidHob);\r
+\r
+  //\r
+  // Create Memory Type Information HOB\r
+  //\r
+  BuildGuidDataHob (\r
+    &gEfiMemoryTypeInformationGuid,\r
+    mDefaultMemoryTypeInformation,\r
+    sizeof(mDefaultMemoryTypeInformation)\r
+    );\r
+\r
+  //\r
+  // Add PCI IO Port space available for PCI resource allocations.\r
+  //\r
+  BuildResourceDescriptorHob (\r
+    EFI_RESOURCE_IO,\r
+    EFI_RESOURCE_ATTRIBUTE_PRESENT     |\r
+    EFI_RESOURCE_ATTRIBUTE_INITIALIZED,\r
+    0xC000,\r
+    0x4000\r
+    );\r
+\r
+  //\r
+  // Video memory + Legacy BIOS region\r
+  //\r
+  AddIoMemoryRangeHob (0x0A0000, BASE_1MB);\r
+\r
+  //\r
+  // Parse RAM in E820 map\r
+  //\r
+  if (Info->E820EntriesCount > 0) {\r
+    EFI_E820_ENTRY64 *E820Map, *Entry;\r
+    UINT16 Loop;\r
+\r
+    E820Map = (EFI_E820_ENTRY64 *) Info->E820;\r
+    for (Loop = 0; Loop < Info->E820EntriesCount; Loop++) {\r
+      Entry = E820Map + Loop;\r
+\r
+      // only care about RAM\r
+      if (Entry->Type != EfiAcpiAddressRangeMemory)\r
+        continue;\r
+\r
+      if (Entry->BaseAddr >= BASE_4GB)\r
+        AddUntestedMemoryBaseSizeHob (Entry->BaseAddr, Entry->Length);\r
+      else\r
+        AddMemoryBaseSizeHob (Entry->BaseAddr, Entry->Length);\r
+\r
+      MtrrSetMemoryAttribute (Entry->BaseAddr, Entry->Length, CacheWriteBack);\r
+    }\r
+  }\r
+}\r
+\r
 \r
 VOID\r
 MemMapInitialization (\r