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/** @file
Type and macro definitions specific to the Virtio Filesystem device.
At the time of this writing, the latest released Virtio specification (v1.1)
does not include the virtio-fs device. The development version of the
specification defines it however; see the latest version at
<https://github.com/oasis-tcs/virtio-spec/blob/87fa6b5d8155/virtio-fs.tex>.
This header file is minimal, and only defines the types and macros that are
necessary for the OvmfPkg implementation.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef VIRTIO_FS_H_
#define VIRTIO_FS_H_
#include <IndustryStandard/Virtio.h>
//
// Lowest numbered queue for sending normal priority requests.
//
#define VIRTIO_FS_REQUEST_QUEUE 1
//
// Number of bytes in the "VIRTIO_FS_CONFIG.Tag" field.
//
#define VIRTIO_FS_TAG_BYTES 36
//
// Device configuration layout.
//
#pragma pack (1)
typedef struct {
//
// The Tag field can be considered the filesystem label, or a mount point
// hint. It is UTF-8 encoded, and padded to full size with NUL bytes. If the
// encoded bytes take up the entire Tag field, then there is no NUL
// terminator.
//
UINT8 Tag[VIRTIO_FS_TAG_BYTES];
//
// The total number of request virtqueues exposed by the device (i.e.,
// excluding the "hiprio" queue).
//
UINT32 NumReqQueues;
} VIRTIO_FS_CONFIG;
#pragma pack ()
#endif // VIRTIO_FS_H_
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