virtio_pci_legacy.h

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/*
 * Copyright (c) 2018 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef __included_virtio_pci_legacy_h__
#define __included_virtio_pci_legacy_h__
 
/*
 * VirtIO Header, located in BAR 0.
 */
#define VIRTIO_PCI_HOST_FEATURES  0     /* host's supported features (32bit, RO) */
#define VIRTIO_PCI_GUEST_FEATURES 4     /* guest's supported features (32, RW) */
#define VIRTIO_PCI_QUEUE_PFN      8     /* physical address of VQ (32, RW) */
#define VIRTIO_PCI_QUEUE_NUM      12    /* number of ring entries (16, RO) */
#define VIRTIO_PCI_QUEUE_SEL      14    /* current VQ selection (16, RW) */
#define VIRTIO_PCI_QUEUE_NOTIFY   16    /* notify host regarding VQ (16, RW) */
#define VIRTIO_PCI_STATUS         18    /* device status register (8, RW) */
#define VIRTIO_PCI_ISR            19    /* interrupt status register, reading
                                         * also clears the register (8, RO) */
/* Only if MSIX is enabled: */
#define VIRTIO_MSI_CONFIG_VECTOR  20    /* configuration change vector (16, RW) */
#define VIRTIO_MSI_QUEUE_VECTOR   22    /* vector for selected VQ notifications
                                           (16, RW) */
#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
 
#endif /* __included_virtio_pci_legacy_h__ */
/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */