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