1 /*- 2 * This header is BSD licensed so anyone can use the definitions to implement 3 * compatible drivers/servers. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of IBM nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _VIRTIO_CONFIG_H_ 32 #define _VIRTIO_CONFIG_H_ 33 34 /* Status byte for guest to report progress. */ 35 #define VIRTIO_CONFIG_STATUS_RESET 0x00 36 /* We have seen device and processed generic fields. */ 37 #define VIRTIO_CONFIG_STATUS_ACK 0x01 38 /* We have found a driver for the device. */ 39 #define VIRTIO_CONFIG_STATUS_DRIVER 0x02 40 /* Driver has used its parts of the config, and is happy. */ 41 #define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04 42 /* Driver has finished configuring features (modern only). */ 43 #define VIRTIO_CONFIG_S_FEATURES_OK 0x08 44 /* Device entered invalid state, driver must reset it. */ 45 #define VIRTIO_CONFIG_S_NEEDS_RESET 0x40 46 /* We've given up on this device. */ 47 #define VIRTIO_CONFIG_STATUS_FAILED 0x80 48 49 /* 50 * Generate interrupt when the virtqueue ring is 51 * completely used, even if we've suppressed them. 52 */ 53 #define VIRTIO_F_NOTIFY_ON_EMPTY (1UL << 24) 54 55 /* Can the device handle any descriptor layout? */ 56 #define VIRTIO_F_ANY_LAYOUT (1UL << 27) 57 58 /* Support for indirect buffer descriptors. */ 59 #define VIRTIO_RING_F_INDIRECT_DESC (1UL << 28) 60 61 /* Support to suppress interrupt until specific index is reached. */ 62 #define VIRTIO_RING_F_EVENT_IDX (1UL << 29) 63 64 /* 65 * The guest should never negotiate this feature; it 66 * is used to detect faulty drivers. 67 */ 68 #define VIRTIO_F_BAD_FEATURE (1UL << 30) 69 70 /* v1.0 compliant. */ 71 #define VIRTIO_F_VERSION_1 (1ULL << 32) 72 73 /* 74 * If clear - device has the IOMMU bypass quirk feature. 75 * If set - use platform tools to detect the IOMMU. 76 * 77 * Note the reverse polarity (compared to most other features), 78 * this is for compatibility with legacy systems. 79 */ 80 #define VIRTIO_F_IOMMU_PLATFORM (1ULL << 33) 81 82 /* 83 * Some VirtIO feature bits (currently bits 28 through 34) are 84 * reserved for the transport being used (eg. virtio_ring), the 85 * rest are per-device feature bits. 86 */ 87 #define VIRTIO_TRANSPORT_F_START 28 88 #define VIRTIO_TRANSPORT_F_END 34 89 90 #endif /* _VIRTIO_CONFIG_H_ */ 91