src/add-ons/kernel/busses/virtio/virtio_pci.h

   1 /*-
   2  * Copyright IBM Corp. 2007
   3  *
   4  * Authors:
   5  *  Anthony Liguori  <aliguori@us.ibm.com>
   6  *
   7  * This header is BSD licensed so anyone can use the definitions to implement
   8  * compatible drivers/servers.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of IBM nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  23  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * $FreeBSD$
  34  */
  35
  36 #ifndef _VIRTIO_PCI_H
  37 #define _VIRTIO_PCI_H
  38
  39 /* VirtIO PCI vendor/device ID. */
  40 #define VIRTIO_PCI_VENDORID     0x1AF4
  41 #define VIRTIO_PCI_DEVICEID_MIN 0x1000
  42 #define VIRTIO_PCI_DEVICEID_MAX 0x103F
  43
  44 /* VirtIO ABI version, this must match exactly. */
  45 #define VIRTIO_PCI_ABI_VERSION  0
  46
  47 /*
  48  * VirtIO Header, located in BAR 0.
  49  */
  50 #define VIRTIO_PCI_HOST_FEATURES  0  /* host's supported features (32bit, RO)*/
  51 #define VIRTIO_PCI_GUEST_FEATURES 4  /* guest's supported features (32, RW) */
  52 #define VIRTIO_PCI_QUEUE_PFN      8  /* physical address of VQ (32, RW) */
  53 #define VIRTIO_PCI_QUEUE_NUM      12 /* number of ring entries (16, RO) */
  54 #define VIRTIO_PCI_QUEUE_SEL      14 /* current VQ selection (16, RW) */
  55 #define VIRTIO_PCI_QUEUE_NOTIFY   16 /* notify host regarding VQ (16, RW) */
  56 #define VIRTIO_PCI_STATUS         18 /* device status register (8, RW) */
  57 #define VIRTIO_PCI_ISR            19 /* interrupt status register, reading
  58                                       * also clears the register (8, RO) */
  59 /* Only if MSIX is enabled: */
  60 #define VIRTIO_MSI_CONFIG_VECTOR  20 /* configuration change vector (16, RW) */
  61 #define VIRTIO_MSI_QUEUE_VECTOR   22 /* vector for selected VQ notifications
  62                                         (16, RW) */
  63
  64 /* The bit of the ISR which indicates a device has an interrupt. */
  65 #define VIRTIO_PCI_ISR_INTR     0x1
  66 /* The bit of the ISR which indicates a device configuration change. */
  67 #define VIRTIO_PCI_ISR_CONFIG   0x2
  68 /* Vector value used to disable MSI for queue. */
  69 #define VIRTIO_MSI_NO_VECTOR    0xFFFF
  70
  71 /*
  72  * The remaining space is defined by each driver as the per-driver
  73  * configuration space.
  74  */
  75 #define VIRTIO_PCI_CONFIG(bus) \
  76     ((bus->irq_type != VIRTIO_IRQ_LEGACY) ? 24 : 20)
  77
  78 /*
  79  * How many bits to shift physical queue address written to QUEUE_PFN.
  80  * 12 is historical, and due to x86 page size.
  81  */
  82 #define VIRTIO_PCI_QUEUE_ADDR_SHIFT     12
  83
  84 /* The alignment to use between consumer and producer parts of vring. */
  85 #define VIRTIO_PCI_VRING_ALIGN  4096
  86
  87 #endif /* _VIRTIO_PCI_H */