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