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3343660d AL |
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 | ||
55a7c066 AL |
55 | /* Virtio ABI version, this must match exactly */ |
56 | #define VIRTIO_PCI_ABI_VERSION 0 | |
3343660d | 57 | #endif |