virtio.h revision 246109 
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 246109 2013-01-30 04:30:36Z 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#define VIRTIO_MSI_NO_VECTOR	0xFFFF
40
41struct virtio_desc {
42	uint64_t	vd_addr;
43	uint32_t	vd_len;
44	uint16_t	vd_flags;
45	uint16_t	vd_next;
46} __packed;
47
48struct virtio_used {
49	uint32_t	vu_idx;
50	uint32_t	vu_tlen;
51} __packed;
52
53/*
54 * PFN register shift amount
55 */
56#define VRING_PFN		12
57
58/*
59 * Virtio device types
60 */
61#define VIRTIO_TYPE_NET		1
62#define VIRTIO_TYPE_BLOCK	2
63
64/*
65 * PCI vendor/device IDs
66 */
67#define VIRTIO_VENDOR		0x1AF4
68#define VIRTIO_DEV_NET		0x1000
69#define VIRTIO_DEV_BLOCK	0x1001
70
71/*
72 * PCI config space constants
73 */
74#define VTCFG_R_HOSTCAP		0
75#define VTCFG_R_GUESTCAP	4
76#define VTCFG_R_PFN		8
77#define VTCFG_R_QNUM		12
78#define VTCFG_R_QSEL		14
79#define VTCFG_R_QNOTIFY		16
80#define VTCFG_R_STATUS		18
81#define VTCFG_R_ISR		19
82#define VTCFG_R_CFGVEC		20
83#define VTCFG_R_QVEC		22
84#define VTCFG_R_CFG0		20	/* No MSI-X */
85#define VTCFG_R_CFG1		24	/* With MSI-X */
86#define VTCFG_R_MSIX		20
87
88#endif	/* _VIRTIO_H_ */
89