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/*-
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _VIRTIO_CONFIG_H_
#define _VIRTIO_CONFIG_H_
/* Status byte for guest to report progress. */
#define VIRTIO_CONFIG_STATUS_RESET 0x00
/* We have seen device and processed generic fields. */
#define VIRTIO_CONFIG_STATUS_ACK 0x01
/* We have found a driver for the device. */
#define VIRTIO_CONFIG_STATUS_DRIVER 0x02
/* Driver has used its parts of the config, and is happy. */
#define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
/* Driver has finished configuring features (modern only). */
#define VIRTIO_CONFIG_S_FEATURES_OK 0x08
/* Device entered invalid state, driver must reset it. */
#define VIRTIO_CONFIG_S_NEEDS_RESET 0x40
/* We've given up on this device. */
#define VIRTIO_CONFIG_STATUS_FAILED 0x80
/*
* Generate interrupt when the virtqueue ring is
* completely used, even if we've suppressed them.
*/
#define VIRTIO_F_NOTIFY_ON_EMPTY (1UL << 24)
/* Can the device handle any descriptor layout? */
#define VIRTIO_F_ANY_LAYOUT (1UL << 27)
/* Support for indirect buffer descriptors. */
#define VIRTIO_RING_F_INDIRECT_DESC (1UL << 28)
/* Support to suppress interrupt until specific index is reached. */
#define VIRTIO_RING_F_EVENT_IDX (1UL << 29)
/*
* The guest should never negotiate this feature; it
* is used to detect faulty drivers.
*/
#define VIRTIO_F_BAD_FEATURE (1UL << 30)
/* v1.0 compliant. */
#define VIRTIO_F_VERSION_1 (1ULL << 32)
/*
* If clear - device has the IOMMU bypass quirk feature.
* If set - use platform tools to detect the IOMMU.
*
* Note the reverse polarity (compared to most other features),
* this is for compatibility with legacy systems.
*/
#define VIRTIO_F_IOMMU_PLATFORM (1ULL << 33)
/*
* Some VirtIO feature bits (currently bits 28 through 34) are
* reserved for the transport being used (eg. virtio_ring), the
* rest are per-device feature bits.
*/
#define VIRTIO_TRANSPORT_F_START 28
#define VIRTIO_TRANSPORT_F_END 34
#endif /* _VIRTIO_CONFIG_H_ */
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