94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
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#ifndef _VIRTIO_RING_H_
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# define _VIRTIO_RING_H_
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#define PAGE_SHIFT (12)
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#define PAGE_SIZE (1<<PAGE_SHIFT)
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#define PAGE_MASK (PAGE_SIZE-1)
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/* Status byte for guest to report progress, and synchronize features. */
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/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
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#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
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/* We have found a driver for the device. */
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#define VIRTIO_CONFIG_S_DRIVER 2
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/* Driver has used its parts of the config, and is happy */
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#define VIRTIO_CONFIG_S_DRIVER_OK 4
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/* We've given up on this device. */
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#define VIRTIO_CONFIG_S_FAILED 0x80
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#define MAX_QUEUE_NUM (512)
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#define VRING_DESC_F_NEXT 1
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#define VRING_DESC_F_WRITE 2
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#define VRING_AVAIL_F_NO_INTERRUPT 1
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#define VRING_USED_F_NO_NOTIFY 1
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struct vring_desc
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{
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u64 addr;
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u32 len;
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u16 flags;
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u16 next;
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};
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struct vring_avail
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{
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u16 flags;
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u16 idx;
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u16 ring[0];
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};
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struct vring_used_elem
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{
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u32 id;
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u32 len;
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};
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struct vring_used
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{
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u16 flags;
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u16 idx;
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struct vring_used_elem ring[];
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};
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struct vring {
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unsigned int num;
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struct vring_desc *desc;
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struct vring_avail *avail;
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struct vring_used *used;
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};
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static inline void vring_init(struct vring *vr,
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unsigned int num, unsigned char *queue)
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{
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unsigned int i;
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unsigned long pa;
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vr->num = num;
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/* physical address of desc must be page aligned */
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pa = virt_to_phys(queue);
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pa = (pa + PAGE_MASK) & ~PAGE_MASK;
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vr->desc = phys_to_virt(pa);
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vr->avail = (struct vring_avail *)&vr->desc[num];
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/* physical address of used must be page aligned */
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pa = virt_to_phys(&vr->avail->ring[num]);
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pa = (pa + PAGE_MASK) & ~PAGE_MASK;
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vr->used = phys_to_virt(pa);
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for (i = 0; i < num - 1; i++)
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vr->desc[i].next = i + 1;
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vr->desc[i].next = 0;
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}
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#define vring_size(num) \
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(((((sizeof(struct vring_desc) * num) + \
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(sizeof(struct vring_avail) + sizeof(u16) * num)) \
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+ PAGE_MASK) & ~PAGE_MASK) + \
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(sizeof(struct vring_used) + sizeof(struct vring_used_elem) * num))
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#endif /* _VIRTIO_RING_H_ */
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