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Linux kernel mirror (for testing)
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linux
1/*
2 * Virtio PCI driver
3 *
4 * This module allows virtio devices to be used over a virtual PCI device.
5 * This can be used with QEMU based VMMs like KVM or Xen.
6 *
7 * Copyright IBM Corp. 2007
8 *
9 * Authors:
10 * Anthony Liguori <aliguori@us.ibm.com>
11 *
12 * This work is licensed under the terms of the GNU GPL, version 2 or later.
13 * See the COPYING file in the top-level directory.
14 *
15 */
16
17#ifndef _LINUX_VIRTIO_PCI_H
18#define _LINUX_VIRTIO_PCI_H
19
20#include <linux/virtio_config.h>
21
22/* A 32-bit r/o bitmask of the features supported by the host */
23#define VIRTIO_PCI_HOST_FEATURES 0
24
25/* A 32-bit r/w bitmask of features activated by the guest */
26#define VIRTIO_PCI_GUEST_FEATURES 4
27
28/* A 32-bit r/w PFN for the currently selected queue */
29#define VIRTIO_PCI_QUEUE_PFN 8
30
31/* A 16-bit r/o queue size for the currently selected queue */
32#define VIRTIO_PCI_QUEUE_NUM 12
33
34/* A 16-bit r/w queue selector */
35#define VIRTIO_PCI_QUEUE_SEL 14
36
37/* A 16-bit r/w queue notifier */
38#define VIRTIO_PCI_QUEUE_NOTIFY 16
39
40/* An 8-bit device status register. */
41#define VIRTIO_PCI_STATUS 18
42
43/* An 8-bit r/o interrupt status register. Reading the value will return the
44 * current contents of the ISR and will also clear it. This is effectively
45 * a read-and-acknowledge. */
46#define VIRTIO_PCI_ISR 19
47
48/* The bit of the ISR which indicates a device configuration change. */
49#define VIRTIO_PCI_ISR_CONFIG 0x2
50
51/* The remaining space is defined by each driver as the per-driver
52 * configuration space */
53#define VIRTIO_PCI_CONFIG 20
54
55/* Virtio ABI version, this must match exactly */
56#define VIRTIO_PCI_ABI_VERSION 0
57#endif