audk/OvmfPkg/VirtioRngDxe/VirtioRng.h

/** @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