1 #ifndef _VIRTIO_PCI_H_
2 # define _VIRTIO_PCI_H_
3
4 /* A 32-bit r/o bitmask of the features supported by the host */
5 #define VIRTIO_PCI_HOST_FEATURES 0
6
7 /* A 32-bit r/w bitmask of features activated by the guest */
8 #define VIRTIO_PCI_GUEST_FEATURES 4
9
10 /* A 32-bit r/w PFN for the currently selected queue */
11 #define VIRTIO_PCI_QUEUE_PFN 8
12
13 /* A 16-bit r/o queue size for the currently selected queue */
14 #define VIRTIO_PCI_QUEUE_NUM 12
15
16 /* A 16-bit r/w queue selector */
17 #define VIRTIO_PCI_QUEUE_SEL 14
18
19 /* A 16-bit r/w queue notifier */
20 #define VIRTIO_PCI_QUEUE_NOTIFY 16
21
22 /* An 8-bit device status register. */
23 #define VIRTIO_PCI_STATUS 18
24
25 /* An 8-bit r/o interrupt status register. Reading the value will return the
26 * current contents of the ISR and will also clear it. This is effectively
27 * a read-and-acknowledge. */
28 #define VIRTIO_PCI_ISR 19
29
30 /* The bit of the ISR which indicates a device configuration change. */
31 #define VIRTIO_PCI_ISR_CONFIG 0x2
32
33 /* The remaining space is defined by each driver as the per-driver
34 * configuration space */
35 #define VIRTIO_PCI_CONFIG 20
36
37 /* Virtio ABI version, this must match exactly */
38 #define VIRTIO_PCI_ABI_VERSION 0
39
vp_get_features(unsigned int ioaddr)40 static inline u32 vp_get_features(unsigned int ioaddr)
41 {
42 return inl(ioaddr + VIRTIO_PCI_HOST_FEATURES);
43 }
44
vp_set_features(unsigned int ioaddr,u32 features)45 static inline void vp_set_features(unsigned int ioaddr, u32 features)
46 {
47 outl(features, ioaddr + VIRTIO_PCI_GUEST_FEATURES);
48 }
49
vp_get(unsigned int ioaddr,unsigned offset,void * buf,unsigned len)50 static inline void vp_get(unsigned int ioaddr, unsigned offset,
51 void *buf, unsigned len)
52 {
53 u8 *ptr = buf;
54 unsigned i;
55
56 for (i = 0; i < len; i++)
57 ptr[i] = inb(ioaddr + VIRTIO_PCI_CONFIG + offset + i);
58 }
59
vp_get_status(unsigned int ioaddr)60 static inline u8 vp_get_status(unsigned int ioaddr)
61 {
62 return inb(ioaddr + VIRTIO_PCI_STATUS);
63 }
64
vp_set_status(unsigned int ioaddr,u8 status)65 static inline void vp_set_status(unsigned int ioaddr, u8 status)
66 {
67 if (status == 0) /* reset */
68 return;
69 outb(status, ioaddr + VIRTIO_PCI_STATUS);
70 }
71
72
vp_reset(unsigned int ioaddr)73 static inline void vp_reset(unsigned int ioaddr)
74 {
75 outb(0, ioaddr + VIRTIO_PCI_STATUS);
76 (void)inb(ioaddr + VIRTIO_PCI_ISR);
77 }
78
vp_notify(unsigned int ioaddr,int queue_index)79 static inline void vp_notify(unsigned int ioaddr, int queue_index)
80 {
81 outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
82 }
83
vp_del_vq(unsigned int ioaddr,int queue_index)84 static inline void vp_del_vq(unsigned int ioaddr, int queue_index)
85 {
86 /* select the queue */
87
88 outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_SEL);
89
90 /* deactivate the queue */
91
92 outl(0, ioaddr + VIRTIO_PCI_QUEUE_PFN);
93 }
94
95 int vp_find_vq(unsigned int ioaddr, int queue_index,
96 struct vring_virtqueue *vq);
97 #endif /* _VIRTIO_PCI_H_ */
98