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virtio-pci.h
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virtio-pci.h
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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_ */