diff options
Diffstat (limited to 'qemu/roms/SLOF/lib/libvirtio/virtio.h')
| -rw-r--r-- | qemu/roms/SLOF/lib/libvirtio/virtio.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/qemu/roms/SLOF/lib/libvirtio/virtio.h b/qemu/roms/SLOF/lib/libvirtio/virtio.h new file mode 100644 index 000000000..d5759b45a --- /dev/null +++ b/qemu/roms/SLOF/lib/libvirtio/virtio.h @@ -0,0 +1,90 @@ +/****************************************************************************** + * 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 + +#define VIRTIO_TIMEOUT 5000 /* 5 sec timeout */ + +/* 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_qaddr(struct virtio_device *dev, int queue, unsigned int qaddr); +extern void virtio_set_guest_features(struct virtio_device *dev, int features); +extern void virtio_get_host_features(struct virtio_device *dev, int *features); +extern uint64_t virtio_get_config(struct virtio_device *dev, int offset, int size); +extern int __virtio_read_config(struct virtio_device *dev, void *dst, + int offset, int len); + + +#endif /* _LIBVIRTIO_H */ |