Move virtio to a separate library

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 84 insertions, 0 deletions

diff --git a/lib/libvirtio/virtio.h b/lib/libvirtio/virtio.h
new file mode 100644
index 0000000..7355043
--- /dev/null
+++ b/lib/libvirtio/virtio.h
@@ -0,0 +1,84 @@
+/******************************************************************************
+ * Copyright (c) 2011 IBM Corporation
+ * All rights reserved.
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Contributors:
+ *     IBM Corporation - initial implementation
+ *****************************************************************************/
+
+#ifndef _LIBVIRTIO_H
+#define _LIBVIRTIO_H
+
+#include <stdint.h>
+
+/* Device status bits */
+#define VIRTIO_STAT_ACKNOWLEDGE		1
+#define VIRTIO_STAT_DRIVER		2
+#define VIRTIO_STAT_DRIVER_OK		4
+#define VIRTIO_STAT_FAILED		128
+
+/* Definitions for vring_desc.flags */
+#define VRING_DESC_F_NEXT	1	/* buffer continues via the next field */
+#define VRING_DESC_F_WRITE	2	/* buffer is write-only (otherwise read-only) */
+#define VRING_DESC_F_INDIRECT	4	/* buffer contains a list of buffer descriptors */
+
+/* Descriptor table entry - see Virtio Spec chapter 2.3.2 */
+struct vring_desc {
+	uint64_t addr;		/* Address (guest-physical) */
+	uint32_t len;		/* Length */
+	uint16_t flags;		/* The flags as indicated above */
+	uint16_t next;		/* Next field if flags & NEXT */
+}; 
+
+/* Definitions for vring_avail.flags */
+#define VRING_AVAIL_F_NO_INTERRUPT	1
+
+/* Available ring - see Virtio Spec chapter 2.3.4 */
+struct vring_avail {
+	uint16_t flags;
+	uint16_t idx;
+	uint16_t ring[];
+}; 
+
+
+/* Definitions for vring_used.flags */
+#define VRING_USED_F_NO_NOTIFY		1
+
+struct vring_used_elem {
+	uint32_t id;		/* Index of start of used descriptor chain */
+	uint32_t len;		/* Total length of the descriptor chain which was used */
+};
+
+struct vring_used {
+	uint16_t flags;
+	uint16_t idx;
+	struct vring_used_elem ring[];
+};
+
+#define VIRTIO_TYPE_PCI 0	/* For virtio-pci interface */
+struct virtio_device {
+	void *base;		/* base address */
+	int type;		/* VIRTIO_TYPE_PCI or VIRTIO_TYPE_VIO */
+};
+
+/* Parts of the virtqueue are aligned on a 4096 byte page boundary */
+#define VQ_ALIGN(addr)	(((addr) + 0xfff) & ~0xfff)
+
+extern unsigned long virtio_vring_size(unsigned int qsize);
+extern int virtio_get_qsize(struct virtio_device *dev, int queue);
+extern struct vring_desc *virtio_get_vring_desc(struct virtio_device *dev, int queue);
+extern struct vring_avail *virtio_get_vring_avail(struct virtio_device *dev, int queue);
+extern struct vring_used *virtio_get_vring_used(struct virtio_device *dev, int queue);
+
+extern void virtio_reset_device(struct virtio_device *dev);
+extern void virtio_queue_notify(struct virtio_device *dev, int queue);
+extern void virtio_set_status(struct virtio_device *dev, int status);
+extern void virtio_set_guest_features(struct virtio_device *dev, int features);
+extern uint64_t virtio_get_config(struct virtio_device *dev, int offset, int size);
+
+
+#endif /* _LIBVIRTIO_H */