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- #ifndef _VIRTIO_PCI_H_
- # define _VIRTIO_PCI_H_
-
- /* A 32-bit r/o bitmask of the features supported by the host */
- #define VIRTIO_PCI_HOST_FEATURES 0
-
- /* A 32-bit r/w bitmask of features activated by the guest */
- #define VIRTIO_PCI_GUEST_FEATURES 4
-
- /* A 32-bit r/w PFN for the currently selected queue */
- #define VIRTIO_PCI_QUEUE_PFN 8
-
- /* A 16-bit r/o queue size for the currently selected queue */
- #define VIRTIO_PCI_QUEUE_NUM 12
-
- /* A 16-bit r/w queue selector */
- #define VIRTIO_PCI_QUEUE_SEL 14
-
- /* A 16-bit r/w queue notifier */
- #define VIRTIO_PCI_QUEUE_NOTIFY 16
-
- /* An 8-bit device status register. */
- #define VIRTIO_PCI_STATUS 18
-
- /* An 8-bit r/o interrupt status register. Reading the value will return the
- * current contents of the ISR and will also clear it. This is effectively
- * a read-and-acknowledge. */
- #define VIRTIO_PCI_ISR 19
-
- /* The bit of the ISR which indicates a device configuration change. */
- #define VIRTIO_PCI_ISR_CONFIG 0x2
-
- /* The remaining space is defined by each driver as the per-driver
- * configuration space */
- #define VIRTIO_PCI_CONFIG 20
-
- /* Virtio ABI version, this must match exactly */
- #define VIRTIO_PCI_ABI_VERSION 0
-
- static inline u32 vp_get_features(unsigned int ioaddr)
- {
- return inl(ioaddr + VIRTIO_PCI_HOST_FEATURES);
- }
-
- static inline void vp_set_features(unsigned int ioaddr, u32 features)
- {
- outl(features, ioaddr + VIRTIO_PCI_GUEST_FEATURES);
- }
-
- static inline void vp_get(unsigned int ioaddr, unsigned offset,
- void *buf, unsigned len)
- {
- u8 *ptr = buf;
- unsigned i;
-
- for (i = 0; i < len; i++)
- ptr[i] = inb(ioaddr + VIRTIO_PCI_CONFIG + offset + i);
- }
-
- static inline u8 vp_get_status(unsigned int ioaddr)
- {
- return inb(ioaddr + VIRTIO_PCI_STATUS);
- }
-
- static inline void vp_set_status(unsigned int ioaddr, u8 status)
- {
- if (status == 0) /* reset */
- return;
- outb(status, ioaddr + VIRTIO_PCI_STATUS);
- }
-
-
- static inline void vp_reset(unsigned int ioaddr)
- {
- outb(0, ioaddr + VIRTIO_PCI_STATUS);
- (void)inb(ioaddr + VIRTIO_PCI_ISR);
- }
-
- static inline void vp_notify(unsigned int ioaddr, int queue_index)
- {
- outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
- }
-
- static inline void vp_del_vq(unsigned int ioaddr, int queue_index)
- {
- /* select the queue */
-
- outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_SEL);
-
- /* deactivate the queue */
-
- outl(0, ioaddr + VIRTIO_PCI_QUEUE_PFN);
- }
-
- int vp_find_vq(unsigned int ioaddr, int queue_index,
- struct vring_virtqueue *vq);
- #endif /* _VIRTIO_PCI_H_ */
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