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-rw-r--r--gpxe/src/drivers/net/virtio-pci.h94
1 files changed, 94 insertions, 0 deletions
diff --git a/gpxe/src/drivers/net/virtio-pci.h b/gpxe/src/drivers/net/virtio-pci.h
new file mode 100644
index 00000000..ba0604d5
--- /dev/null
+++ b/gpxe/src/drivers/net/virtio-pci.h
@@ -0,0 +1,94 @@
+#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(struct nic *nic)
+{
+ return inl(nic->ioaddr + VIRTIO_PCI_HOST_FEATURES);
+}
+
+static inline void vp_set_features(struct nic *nic, u32 features)
+{
+ outl(features, nic->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
+}
+
+static inline void vp_get(struct nic *nic, unsigned offset,
+ void *buf, unsigned len)
+{
+ u8 *ptr = buf;
+ unsigned i;
+
+ for (i = 0; i < len; i++)
+ ptr[i] = inb(nic->ioaddr + VIRTIO_PCI_CONFIG + offset + i);
+}
+
+static inline u8 vp_get_status(struct nic *nic)
+{
+ return inb(nic->ioaddr + VIRTIO_PCI_STATUS);
+}
+
+static inline void vp_set_status(struct nic *nic, u8 status)
+{
+ if (status == 0) /* reset */
+ return;
+ outb(status, nic->ioaddr + VIRTIO_PCI_STATUS);
+}
+
+
+static inline void vp_reset(struct nic *nic)
+{
+ outb(0, nic->ioaddr + VIRTIO_PCI_STATUS);
+ (void)inb(nic->ioaddr + VIRTIO_PCI_ISR);
+}
+
+static inline void vp_notify(struct nic *nic, int queue_index)
+{
+ outw(queue_index, nic->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
+}
+
+static inline void vp_del_vq(struct nic *nic, int queue_index)
+{
+ /* select the queue */
+
+ outw(queue_index, nic->ioaddr + VIRTIO_PCI_QUEUE_SEL);
+
+ /* deactivate the queue */
+
+ outl(0, nic->ioaddr + VIRTIO_PCI_QUEUE_PFN);
+}
+#endif /* _VIRTIO_PCI_H_ */