OvmfPkg/XenIoPvhDxe/XenIoPvhDxe.c

   1 /** @file
   2
   3   Driver for the XenIo protocol
   4
   5   This driver simply allocate space for the grant tables.
   6
   7   Copyright (c) 2019, Citrix Systems, Inc.
   8
   9   SPDX-License-Identifier: BSD-2-Clause-Patent
  10
  11 **/
  12
  13 #include <Library/MemoryAllocationLib.h>
  14 #include <Library/PcdLib.h>
  15 #include <Library/XenIoMmioLib.h>
  16 #include <Library/XenPlatformLib.h>
  17
  18 EFI_STATUS
  19 EFIAPI
  20 InitializeXenIoPvhDxe (
  21   IN EFI_HANDLE        ImageHandle,
  22   IN EFI_SYSTEM_TABLE  *SystemTable
  23   )
  24 {
  25   VOID        *Allocation;
  26   EFI_STATUS  Status;
  27   EFI_HANDLE  XenIoHandle;
  28
  29   Allocation  = NULL;
  30   XenIoHandle = NULL;
  31
  32   if (!XenPvhDetected ()) {
  33     return EFI_UNSUPPORTED;
  34   }
  35
  36   Allocation = AllocateReservedPages (FixedPcdGet32 (PcdXenGrantFrames));
  37   if (Allocation == NULL) {
  38     Status = EFI_OUT_OF_RESOURCES;
  39     goto Error;
  40   }
  41
  42   Status = XenIoMmioInstall (&XenIoHandle, (UINTN)Allocation);
  43   if (EFI_ERROR (Status)) {
  44     goto Error;
  45   }
  46
  47   return EFI_SUCCESS;
  48
  49 Error:
  50   if (Allocation != NULL) {
  51     FreePages (Allocation, FixedPcdGet32 (PcdXenGrantFrames));
  52   }
  53
  54   return Status;
  55 }