virtio.h revision 245678 
1/*-
2 * Copyright (c) 2011 NetApp, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/usr.sbin/bhyve/virtio.h 245678 2013-01-20 03:42:49Z neel $
27 */
28
29#ifndef	_VIRTIO_H_
30#define	_VIRTIO_H_
31
32#define VRING_ALIGN	4096
33
34#define VRING_DESC_F_NEXT	(1 << 0)
35#define VRING_DESC_F_WRITE	(1 << 1)
36#define VRING_DESC_F_INDIRECT	(1 << 2)
37
38#define VRING_AVAIL_F_NO_INTERRUPT   1
39
40struct virtio_desc {
41	uint64_t	vd_addr;
42	uint32_t	vd_len;
43	uint16_t	vd_flags;
44	uint16_t	vd_next;
45} __packed;
46
47struct virtio_used {
48	uint32_t	vu_idx;
49	uint32_t	vu_tlen;
50} __packed;
51
52/*
53 * PFN register shift amount
54 */
55#define VRING_PFN		12
56
57/*
58 * Virtio device types
59 */
60#define VIRTIO_TYPE_NET		1
61#define VIRTIO_TYPE_BLOCK	2
62
63/*
64 * PCI vendor/device IDs
65 */
66#define VIRTIO_VENDOR		0x1AF4
67#define VIRTIO_DEV_NET		0x1000
68#define VIRTIO_DEV_BLOCK	0x1001
69
70/*
71 * PCI config space constants
72 */
73#define VTCFG_R_HOSTCAP		0
74#define VTCFG_R_GUESTCAP	4
75#define VTCFG_R_PFN		8
76#define VTCFG_R_QNUM		12
77#define VTCFG_R_QSEL		14
78#define VTCFG_R_QNOTIFY		16
79#define VTCFG_R_STATUS		18
80#define VTCFG_R_ISR		19
81#define VTCFG_R_CFG0		20	/* No MSI-X */
82#define VTCFG_R_CFG1		24	/* With MSI-X */
83#define VTCFG_R_MSIX		20
84
85#endif	/* _VIRTIO_H_ */
86