1 files changed, 144 insertions, 0 deletions
diff --git a/OvmfPkg/PlatformPei/Xen.c b/OvmfPkg/PlatformPei/Xen.c
new file mode 100644
index 0000000000..1bb6b50a4d
--- /dev/null
+++ b/OvmfPkg/PlatformPei/Xen.c
@@ -0,0 +1,144 @@
+/**@file
+  Xen Platform PEI support
+
+  Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2011, Andrei Warkentin <andreiw@motorola.com>
+
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+//
+// The package level header files this module uses
+//
+#include <PiPei.h>
+
+//
+// The Library classes this module consumes
+//
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PcdLib.h>
+#include <Guid/XenInfo.h>
+
+#include "Platform.h"
+
+EFI_XEN_INFO mXenInfo;
+
+
+/**
+  Connects to the Hypervisor.
+ 
+  @param  XenLeaf     CPUID index used to connect.
+
+  @return EFI_STATUS
+
+**/
+EFI_STATUS
+XenConnect (
+  UINT32 XenLeaf
+  )
+{
+  UINT32 Index;
+  UINT32 TransferReg;
+  UINT32 TransferPages;
+  UINT32 XenVersion;
+
+  AsmCpuid (XenLeaf + 2, &TransferPages, &TransferReg, NULL, NULL);
+  mXenInfo.HyperPages = AllocatePages (TransferPages);
+  if (!mXenInfo.HyperPages) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  for (Index = 0; Index < TransferPages; Index++) {
+    AsmWriteMsr64 (TransferReg,
+                   (UINTN) mXenInfo.HyperPages +
+                   (Index << EFI_PAGE_SHIFT) + Index);
+  }
+
+  AsmCpuid (XenLeaf + 1, &XenVersion, NULL, NULL, NULL);
+  DEBUG ((EFI_D_ERROR, "Detected Xen version %d.%d\n",
+          XenVersion >> 16, XenVersion & 0xFFFF));
+  mXenInfo.VersionMajor = XenVersion >> 16;
+  mXenInfo.VersionMinor = XenVersion & 0xFFFF;
+
+  /* TBD: Locate hvm_info and reserve it away. */
+  mXenInfo.HvmInfo = NULL;
+
+  BuildGuidDataHob (
+    &gEfiXenInfoGuid,
+    &mXenInfo,
+    sizeof(mXenInfo)
+    );
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Figures out if we are running inside Xen HVM.
+
+  @return UINT32     CPUID index used to connect to HV.
+
+**/
+UINT32
+XenDetect (
+  VOID
+  )
+{
+
+  UINT32 XenLeaf;
+  UINT8 Signature[13];
+
+  for (XenLeaf = 0x40000000; XenLeaf < 0x40010000; XenLeaf += 0x100) {
+    AsmCpuid (XenLeaf, NULL, (UINT32 *) &Signature[0],
+              (UINT32 *) &Signature[4],
+              (UINT32 *) &Signature[8]);
+    Signature[12] = '\0';
+
+    if (!AsciiStrCmp ((CHAR8 *) Signature, "XenVMMXenVMM")) {
+      return XenLeaf;
+    }
+  }
+
+  return 0;
+}
+
+/**
+  Perform Xen PEI initialization.
+
+  @return EFI_SUCCESS     Xen initialized successfully
+  @return EFI_NOT_FOUND   Not running under Xen
+
+**/
+EFI_STATUS
+InitializeXen (
+  VOID
+  )
+{
+  UINT32 XenLeaf;
+
+  XenLeaf = XenDetect ();
+
+  if (XenLeaf == 0) {
+    return EFI_NOT_FOUND;
+  }
+
+  DEBUG ((EFI_D_INFO, "Xen was detected\n"));
+
+  XenConnect (XenLeaf);
+
+  //
+  // Reserve away HVMLOADER reserved memory [0xFC000000,0xFD000000).
+  // This needs to match HVMLOADER RESERVED_MEMBASE/RESERVED_MEMSIZE.
+  //
+  AddReservedMemoryBaseSizeHob (0xFC000000, 0x1000000);
+
+  return EFI_SUCCESS;
+}