FreeBSD/Linux Kernel Cross Reference
sys/dev/virtio/virtio_config.h

     /*-
      * 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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