DxeResetShutdownXen.c

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#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;
}
 
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 ();
}