| #pragma once |
| /* This header, excluding the #ifdef __KERNEL__ part, 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. */ |
| |
| /* Virtio devices use a standardized configuration space to define their |
| * features and pass configuration information, but each implementation can |
| * store and access that space differently. */ |
| |
| /* Status byte for guest to report progress, and synchronize features. */ |
| /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */ |
| #define VIRTIO_CONFIG_S_ACKNOWLEDGE 1 |
| /* We have found a driver for the device. */ |
| #define VIRTIO_CONFIG_S_DRIVER 2 |
| /* Driver has used its parts of the config, and is happy */ |
| #define VIRTIO_CONFIG_S_DRIVER_OK 4 |
| /* Driver has finished configuring features */ |
| #define VIRTIO_CONFIG_S_FEATURES_OK 8 |
| /* 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_S_FAILED 0x80 |
| |
| /* Some virtio feature bits (currently bits 28 through 32) 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 33 |
| |
| #ifndef VIRTIO_CONFIG_NO_LEGACY |
| /* Do we get callbacks when the ring is completely used, even if we've |
| * suppressed them? */ |
| #define VIRTIO_F_NOTIFY_ON_EMPTY 24 |
| |
| /* Can the device handle any descriptor layout? */ |
| #define VIRTIO_F_ANY_LAYOUT 27 |
| #endif /* VIRTIO_CONFIG_NO_LEGACY */ |
| |
| /* v1.0 compliant. */ |
| #define VIRTIO_F_VERSION_1 32 |
