1 files changed, 77 insertions, 0 deletions
diff --git a/OvmfPkg/Library/ResetSystemLib/DxeResetShutdownXen.c b/OvmfPkg/Library/ResetSystemLib/DxeResetShutdownXen.c
new file mode 100644
index 0000000000..f7f32765cf
--- /dev/null
+++ b/OvmfPkg/Library/ResetSystemLib/DxeResetShutdownXen.c
@@ -0,0 +1,77 @@
+/** @file
+  DXE Reset System Library Shutdown API implementation for OVMF.
+
+  Copyright (C) 2020, Red Hat, Inc.
+  Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Base.h>                   // BIT13
+
+#include <IndustryStandard/Xen/sched.h>
+#include <Library/BaseLib.h>        // CpuDeadLoop()
+#include <Library/DebugLib.h>       // ASSERT()
+#include <Library/IoLib.h>          // IoOr16()
+#include <Library/PcdLib.h>         // PcdGet16()
+#include <Library/ResetSystemLib.h> // ResetShutdown()
+#include <Library/XenHypercallLib.h>
+#include <OvmfPlatforms.h>          // PIIX4_PMBA_VALUE
+
+STATIC UINT16  mAcpiPmBaseAddress;
+
+EFI_STATUS
+EFIAPI
+DxeResetInit (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  UINT16  HostBridgeDevId;
+
+  HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);
+  switch (HostBridgeDevId) {
+    case INTEL_82441_DEVICE_ID:
+      mAcpiPmBaseAddress = PIIX4_PMBA_VALUE;
+      break;
+    case INTEL_Q35_MCH_DEVICE_ID:
+      mAcpiPmBaseAddress = ICH9_PMBASE_VALUE;
+      break;
+    default:
+      //
+      // Fallback to using hypercall.
+      // Necessary for PVH guest, but should work for HVM guest.
+      //
+      mAcpiPmBaseAddress = 0xffff;
+      break;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Calling this function causes the system to enter a power state equivalent
+  to the ACPI G2/S5 or G3 states.
+
+  System shutdown should not return, if it returns, it means the system does
+  not support shut down reset.
+**/
+VOID
+EFIAPI
+ResetShutdown (
+  VOID
+  )
+{
+  if (mAcpiPmBaseAddress != 0xffff) {
+    IoBitFieldWrite16 (mAcpiPmBaseAddress + 4, 10, 13, 0);
+    IoOr16 (mAcpiPmBaseAddress + 4, BIT13);
+  } else {
+    INTN                ReturnCode;
+    XEN_SCHED_SHUTDOWN  ShutdownOp = {
+      .Reason = XEN_SHED_SHUTDOWN_POWEROFF,
+    };
+    ReturnCode = XenHypercallSchedOp (XEN_SCHEDOP_SHUTDOWN, &ShutdownOp);
+    ASSERT (ReturnCode == 0);
+  }
+
+  CpuDeadLoop ();
+}