text: /** @file
  
    Private definitions of the VirtioRng RNG driver
  
    Copyright (C) 2016, Linaro Ltd.
  
    SPDX-License-Identifier: BSD-2-Clause-Patent
  
  **/
  
  #ifndef _VIRTIO_RNG_DXE_H_
  #define _VIRTIO_RNG_DXE_H_
  
  #include <Protocol/ComponentName.h>
  #include <Protocol/DriverBinding.h>
  #include <Protocol/Rng.h>
  
  #include <IndustryStandard/Virtio.h>
  
  #define VIRTIO_RNG_SIG SIGNATURE_32 ('V', 'R', 'N', 'G')
  
  typedef struct {
    //
    // Parts of this structure are initialized / torn down in various functions
    // at various call depths. The table to the right should make it easier to
    // track them.
    //
    //                        field              init function       init depth
    //                        ----------------   ------------------  ----------
    UINT32                    Signature;      // DriverBindingStart   0
    VIRTIO_DEVICE_PROTOCOL    *VirtIo;        // DriverBindingStart   0
    EFI_EVENT                 ExitBoot;       // DriverBindingStart   0
    VRING                     Ring;           // VirtioRingInit       2
    EFI_RNG_PROTOCOL          Rng;            // VirtioRngInit        1
    VOID                      *RingMap;       // VirtioRingMap        2
  } VIRTIO_RNG_DEV;
  
  #define VIRTIO_ENTROPY_SOURCE_FROM_RNG(RngPointer) \
            CR (RngPointer, VIRTIO_RNG_DEV, Rng, VIRTIO_RNG_SIG)
  
  #endif
  