2 * This file is part of the Palacios Virtual Machine Monitor developed
3 * by the V3VEE Project with funding from the United States National
4 * Science Foundation and the Department of Energy.
6 * The V3VEE Project is a joint project between Northwestern University
7 * and the University of New Mexico. You can find out more at
10 * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
11 * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
12 * All rights reserved.
14 * Author: Jack Lange <jarusl@cs.northwestern.edu>
16 * This is free software. You are permitted to use,
17 * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
21 #ifndef __DEVICES_LNX_VIRTIO_PCI_H__
22 #define __DEVICES_LNX_VIRTIO_PCI_H__
27 /* PCI Vendor IDs (from Qemu) */
28 #define VIRTIO_VENDOR_ID 0x1af4 // Redhat/Qumranet
29 #define VIRTIO_SUBVENDOR_ID 0x1af4 // Redhat/Qumranet
30 #define VIRTIO_SUBDEVICE_ID 0x1100 // Qemu
33 #define VIRTIO_NET_DEV_ID 0x1000
34 #define VIRTIO_BLOCK_DEV_ID 0x1001
35 #define VIRTIO_BALLOON_DEV_ID 0x1002
36 #define VIRTIO_CONSOLE_DEV_ID 0x1003
38 #define VIRTIO_BLOCK_SUBDEVICE_ID 2
42 #define HOST_FEATURES_PORT 0
43 #define GUEST_FEATURES_PORT 4
44 #define VRING_PG_NUM_PORT 8
45 #define VRING_SIZE_PORT 12
46 #define VRING_Q_SEL_PORT 14
47 #define VRING_Q_NOTIFY_PORT 16
48 #define VIRTIO_STATUS_PORT 18
49 #define VIRTIO_ISR_PORT 19
51 #define VIRTIO_PAGE_SHIFT 12
54 /* Descriptor flags */
55 /* This marks a buffer as continuing via the next field. */
56 #define VIRTIO_NEXT_FLAG 0x1
57 /* This marks a buffer as write-only (otherwise read-only). */
58 #define VIRTIO_WR_ONLY_FLAG 0x2
62 /* This means don't notify other side when buffer added. */
63 #define VRING_NO_NOTIFY_FLAG 0x1
67 /* This means don't interrupt guest when buffer consumed. */
68 #define VIRTIO_NO_IRQ_FLAG 0x1
70 /* The virtio configuration space is a hybrid io/memory mapped model
71 * All IO is done via IO port accesses
72 * The IO ports access fields in a virtio data structure, and the base io port
73 * coincides with the base address of the in memory structure
74 * There is a standard virtio structure of 20 bytes, followed by a
75 * device specific structure of n bytes.
78 struct virtio_config {
79 uint32_t host_features;
80 uint32_t guest_features;
81 uint32_t vring_page_num;
82 uint16_t vring_ring_size;
83 uint16_t vring_queue_selector;
84 uint16_t vring_queue_notifier;
87 } __attribute__((packed));
95 } __attribute__((packed));
101 } __attribute__((packed));
104 struct vring_used_elem {
107 } __attribute__((packed));
112 struct vring_used_elem ring[0];
113 } __attribute__((packed));
117 struct virtio_queue {
120 uint16_t cur_avail_idx;
122 addr_t ring_desc_addr;
123 addr_t ring_avail_addr;
124 addr_t ring_used_addr;
127 struct vring_desc * desc; // We can treat this as an array...
128 struct vring_avail * avail;
129 struct vring_used * used;