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Diffstat (limited to 'roms/SLOF/lib/libvirtio/virtio.h')
| -rw-r--r-- | roms/SLOF/lib/libvirtio/virtio.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/roms/SLOF/lib/libvirtio/virtio.h b/roms/SLOF/lib/libvirtio/virtio.h new file mode 100644 index 000000000..c4eafe40d --- /dev/null +++ b/roms/SLOF/lib/libvirtio/virtio.h @@ -0,0 +1,132 @@ +/****************************************************************************** + * 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_FEATURES_OK 8 +#define VIRTIO_STAT_NEEDS_RESET 64 +#define VIRTIO_STAT_FAILED 128 + +#define BIT(x) (1UL << (x)) + +/* VIRTIO 1.0 Device independent feature bits */ +#define VIRTIO_F_RING_INDIRECT_DESC BIT(28) +#define VIRTIO_F_RING_EVENT_IDX BIT(29) +#define VIRTIO_F_VERSION_1 BIT(32) +#define VIRTIO_F_IOMMU_PLATFORM BIT(33) + +#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[]; +}; + +/* Structure shared with SLOF and is 16bytes */ +struct virtio_cap { + void *addr; + uint8_t bar; + uint8_t is_io; + uint8_t cap_id; +}; + +struct vqs { + uint32_t size; + void *buf_mem; + struct vring_desc *desc; + struct vring_avail *avail; + struct vring_used *used; + void **desc_gpas; /* to get gpa from desc->addr (which is ioba) */ + uint64_t bus_desc; +}; + +struct virtio_device { + uint64_t features; + struct virtio_cap legacy; + struct virtio_cap common; + struct virtio_cap notify; + struct virtio_cap isr; + struct virtio_cap device; + struct virtio_cap pci; + uint32_t notify_off_mul; + struct vqs vq[3]; +}; + +/* 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 unsigned 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_fill_desc(struct vqs *vq, int id, uint64_t features, + uint64_t addr, uint32_t len, + uint16_t flags, uint16_t next); +extern void virtio_free_desc(struct vqs *vq, int id, uint64_t features); +void *virtio_desc_addr(struct virtio_device *vdev, int queue, int id); +extern struct vqs *virtio_queue_init_vq(struct virtio_device *dev, unsigned int id); +extern void virtio_queue_term_vq(struct virtio_device *dev, struct vqs *vq, unsigned int id); + +extern struct virtio_device *virtio_setup_vd(void); +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_get_status(struct virtio_device *dev, int *status); +extern void virtio_set_guest_features(struct virtio_device *dev, uint64_t features); +extern uint64_t virtio_get_host_features(struct virtio_device *dev); +extern int virtio_negotiate_guest_features(struct virtio_device *dev, uint64_t 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 */ |