[Xen-devel] [PATCH RFC 7/7] OvmfPkg: introduce XenMemMapInitialization

[Wei Liu <wei.liu2@xxxxxxxxxx>]

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

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 OvmfPkg/PlatformPei/Platform.c |   83 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 81 insertions(+), 2 deletions(-)

diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index 9b7828f..ea5de66 100644
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -34,6 +34,10 @@
 #include <Guid/MemoryTypeInformation.h>
 #include <Ppi/MasterBootMode.h>
 #include <IndustryStandard/Pci22.h>
+#include <Guid/XenInfo.h>
+#include <IndustryStandard/E820.h>
+#include <Library/ResourcePublicationLib.h>
+#include <Library/MtrrLib.h>
 
 #include "Platform.h"
 #include "Cmos.h"
@@ -163,6 +167,75 @@ AddUntestedMemoryRangeHob (
   AddUntestedMemoryBaseSizeHob (MemoryBase, (UINT64)(MemoryLimit - 
MemoryBase));
 }
 
+VOID
+XenMemMapInitialization (
+  VOID
+  )
+{
+  EFI_HOB_GUID_TYPE *GuidHob;
+  EFI_XEN_INFO *Info;
+
+  DEBUG ((EFI_D_ERROR, "Using memory map provided by Xen\n"));
+
+  GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
+
+  ASSERT (GuidHob != NULL);
+
+  Info = GET_GUID_HOB_DATA (GuidHob);
+
+  //
+  // Create Memory Type Information HOB
+  //
+  BuildGuidDataHob (
+    &gEfiMemoryTypeInformationGuid,
+    mDefaultMemoryTypeInformation,
+    sizeof(mDefaultMemoryTypeInformation)
+    );
+
+  //
+  // Add PCI IO Port space available for PCI resource allocations.
+  // IoResourceBase and IoResourceMax aren't actually necessary.
+  //
+  BuildResourceDescriptorHob (
+    EFI_RESOURCE_IO,
+    EFI_RESOURCE_ATTRIBUTE_PRESENT     |
+    EFI_RESOURCE_ATTRIBUTE_INITIALIZED,
+    0xC000,
+    0x4000
+    );
+
+  //
+  // Video memory + Legacy BIOS region
+  //
+  AddIoMemoryRangeHob (0x0A0000, BASE_1MB);
+
+  AddIoMemoryBaseSizeHob (PcdGet32(PcdCpuLocalApicBaseAddress), SIZE_1MB);
+
+  //
+  // Parse RAM in E820 map
+  //
+  if (Info->E820EntryCount > 0) {
+    struct e820_entry *E820Map, *Entry;
+    UINT16 Loop;
+
+    E820Map = Info->E820;
+    for (Loop = 0; Loop < Info->E820EntryCount; Loop++) {
+      Entry = E820Map + Loop;
+
+      // only care about RAM
+      if (Entry->type != E820_RAM)
+        continue;
+
+      if (Entry->addr >= BASE_4GB)
+       AddUntestedMemoryBaseSizeHob (Entry->addr, Entry->size);
+      else
+       AddMemoryBaseSizeHob (Entry->addr, Entry->size);
+
+      MtrrSetMemoryAttribute (Entry->addr, Entry->size, CacheWriteBack);
+    }
+  }
+}
+
 
 VOID
 MemMapInitialization (
@@ -346,7 +419,10 @@ InitializePlatform (
 
   XenLeaf = XenDetect ();
 
-  TopOfMemory = MemDetect ();
+  if (XenLeaf == 0)
+    TopOfMemory = MemDetect ();
+  else
+    PublishPeiMemory ();
 
   if (XenLeaf != 0) {
     DEBUG ((EFI_D_INFO, "Xen was detected\n"));
@@ -357,7 +433,10 @@ InitializePlatform (
 
   PeiFvInitialization ();
 
-  MemMapInitialization (TopOfMemory);
+  if (XenLeaf != 0)
+    XenMemMapInitialization ();
+  else
+    MemMapInitialization (TopOfMemory);
 
   MiscInitialization ();
 
-- 
1.7.10.4


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