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 #define VIRTIO_CONFIG_STATUS_ACK 0x01 37 #define VIRTIO_CONFIG_STATUS_DRIVER 0x03 38 #define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04 39 #define VIRTIO_CONFIG_STATUS_FAILED 0x80 40 41 /* 42 * Generate interrupt when the virtqueue ring is 43 * completely used, even if we've suppressed them. 44 */ 45 #define VIRTIO_F_NOTIFY_ON_EMPTY (1 << 24) 46 47 /* Support for indirect buffer descriptors. */ 48 #define VIRTIO_RING_F_INDIRECT_DESC (1 << 28) 49 50 /* Support to suppress interrupt until specific index is reached. */ 51 #define VIRTIO_RING_F_EVENT_IDX (1 << 29) 52 53 /* 54 * The guest should never negotiate this feature; it 55 * is used to detect faulty drivers. 56 */ 57 #define VIRTIO_F_BAD_FEATURE (1 << 30) 58 59 /* 60 * Some VirtIO feature bits (currently bits 28 through 31) are 61 * reserved for the transport being used (eg. virtio_ring), the 62 * rest are per-device feature bits. 63 */ 64 #define VIRTIO_TRANSPORT_F_START 28 65 #define VIRTIO_TRANSPORT_F_END 32 66 67 #endif /* _VIRTIO_CONFIG_H_ */ 68