This function parses E820 map provided by Xen and arrange memory maps
accordingly.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
OvmfPkg/PlatformPei/Platform.c | 70 ++++++++++++++++++++++++++++++++++++++++
OvmfPkg/PlatformPei/Platform.h | 8 +++++
OvmfPkg/PlatformPei/Xen.c | 26 +++++++++++++++
3 files changed, 104 insertions(+)
diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index 9b7828f..83acd8b 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 +167,72 @@ AddUntestedMemoryRangeHob (
AddUntestedMemoryBaseSizeHob (MemoryBase, (UINT64)(MemoryLimit -
MemoryBase));
}
+VOID
+XenMemMapInitialization (
+ VOID
+ )
+{
+ EFI_E820_ENTRY64 *E820Map;
+ UINT32 E820EntriesCount;
+ EFI_STATUS Status;
+
+ DEBUG ((EFI_D_ERROR, "Using memory map provided by Xen\n"));
+
+ //
+ // Create Memory Type Information HOB
+ //
+ BuildGuidDataHob (
+ &gEfiMemoryTypeInformationGuid,
+ mDefaultMemoryTypeInformation,
+ sizeof(mDefaultMemoryTypeInformation)
+ );
+
+ //
+ // Add PCI IO Port space available for PCI resource allocations.
+ //
+ BuildResourceDescriptorHob (
+ EFI_RESOURCE_IO,
+ EFI_RESOURCE_ATTRIBUTE_PRESENT |
+ EFI_RESOURCE_ATTRIBUTE_INITIALIZED,
+ 0xC000,
+ 0x4000
+ );
+
+ //
+ // Video memory + Legacy BIOS region
+ //
+ AddIoMemoryRangeHob (0x0A0000, BASE_1MB);
+
+ //
+ // Parse RAM in E820 map
+ //
+ Status = XenGetE820Map(&E820Map, &E820EntriesCount);
+
+ ASSERT_EFI_ERROR (Status);
+
+ if (E820EntriesCount > 0) {
+ EFI_E820_ENTRY64 *Entry;
+ UINT32 Loop;
+
+ for (Loop = 0; Loop < E820EntriesCount; Loop++) {
+ Entry = E820Map + Loop;
+
+ // only care about RAM
+ if (Entry->Type != EfiAcpiAddressRangeMemory) {
+ continue;
+ }
+
+ if (Entry->BaseAddr >= BASE_4GB) {
+ AddUntestedMemoryBaseSizeHob (Entry->BaseAddr, Entry->Length);
+ } else {
+ AddMemoryBaseSizeHob (Entry->BaseAddr, Entry->Length);
+ }
+
+ MtrrSetMemoryAttribute (Entry->BaseAddr, Entry->Length,
CacheWriteBack);
+ }
+ }
+}
+
VOID
MemMapInitialization (
diff --git a/OvmfPkg/PlatformPei/Platform.h b/OvmfPkg/PlatformPei/Platform.h
index 7344c61..5378b9d 100644
--- a/OvmfPkg/PlatformPei/Platform.h
+++ b/OvmfPkg/PlatformPei/Platform.h
@@ -15,6 +15,8 @@
#ifndef _PLATFORM_PEI_H_INCLUDED_
#define _PLATFORM_PEI_H_INCLUDED_
+#include <IndustryStandard/E820.h>
+
VOID
AddIoMemoryBaseSizeHob (
EFI_PHYSICAL_ADDRESS MemoryBase,
@@ -82,4 +84,10 @@ XenDetect (
VOID
);
+EFI_STATUS
+XenGetE820Map (
+ EFI_E820_ENTRY64 **Entries,
+ UINT32 *Count
+ );
+
#endif // _PLATFORM_PEI_H_INCLUDED_
diff --git a/OvmfPkg/PlatformPei/Xen.c b/OvmfPkg/PlatformPei/Xen.c
index 054cc4a..88c0aec 100644
--- a/OvmfPkg/PlatformPei/Xen.c
+++ b/OvmfPkg/PlatformPei/Xen.c
@@ -29,9 +29,35 @@
#include <Guid/XenInfo.h>
#include "Platform.h"
+#include "Xen.h"
EFI_XEN_INFO mXenInfo;
+/**
+ Returns E820 map provided by Xen
+
+ @param Entries Pointer to E820 map
+ @param Count Number of entries
+
+ @return EFI_STATUS
+**/
+EFI_STATUS
+XenGetE820Map (
+ EFI_E820_ENTRY64 **Entries,
+ UINT32 *Count
+ )
+{
+ EFI_XEN_OVMF_INFO *Info = (EFI_XEN_OVMF_INFO *) OVMF_INFO_PHYSICAL_ADDRESS;
+
+ if (AsciiStrCmp ((CHAR8 *) Info->Signature, "XenHVMOVMF")) {
+ return EFI_NOT_FOUND;
+ }
+
+ *Entries = (EFI_E820_ENTRY64 *) Info->E820;
+ *Count = Info->E820EntriesCount;
+
+ return EFI_SUCCESS;
+}
/**
Connects to the Hypervisor.
--
1.7.10.4