FreeBSD/Linux Kernel Cross Reference
sys/dev/virtio/pci/virtio_pci_legacy_var.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright IBM Corp. 2007
      *
      * Authors:
      *  Anthony Liguori  <aliguori@us.ibm.com>
      *
      * 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_PCI_LEGACY_VAR_H
    #define _VIRTIO_PCI_LEGACY_VAR_H
    
    #include <dev/virtio/pci/virtio_pci_var.h>
    
    /* VirtIO ABI version, this must match exactly. */
    #define VIRTIO_PCI_ABI_VERSION  0
    
    /*
     * 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) */
    
    /*
     * The remaining space is defined by each driver as the per-driver
     * configuration space.
     */
    #define VIRTIO_PCI_CONFIG_OFF(msix_enabled)     ((msix_enabled) ? 24 : 20)
    
    /*
     * How many bits to shift physical queue address written to QUEUE_PFN.
     * 12 is historical, and due to x86 page size.
     */
    #define VIRTIO_PCI_QUEUE_ADDR_SHIFT     12
    
    /* The alignment to use between consumer and producer parts of vring. */
    #define VIRTIO_PCI_VRING_ALIGN  4096
    
    #endif /* _VIRTIO_PCI_LEGACY_VAR_H */

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