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- #ifndef _LINUX_VIRTIO_RING_H
- #define _LINUX_VIRTIO_RING_H
- #include <stdint.h>
- #include <linux/types.h>
- #include <linux/virtio_types.h>
- #define VRING_DESC_F_NEXT 1
- #define VRING_DESC_F_WRITE 2
- #define VRING_DESC_F_INDIRECT 4
- #define VRING_USED_F_NO_NOTIFY 1
- #define VRING_AVAIL_F_NO_INTERRUPT 1
- #define VIRTIO_RING_F_INDIRECT_DESC 28
- #define VIRTIO_RING_F_EVENT_IDX 29
- struct vring_desc {
-
- __virtio64 addr;
-
- __virtio32 len;
-
- __virtio16 flags;
-
- __virtio16 next;
- };
- struct vring_avail {
- __virtio16 flags;
- __virtio16 idx;
- __virtio16 ring[];
- };
- struct vring_used_elem {
-
- __virtio32 id;
-
- __virtio32 len;
- };
- struct vring_used {
- __virtio16 flags;
- __virtio16 idx;
- struct vring_used_elem ring[];
- };
- struct vring {
- unsigned int num;
- struct vring_desc *desc;
- struct vring_avail *avail;
- struct vring_used *used;
- };
- #define VRING_AVAIL_ALIGN_SIZE 2
- #define VRING_USED_ALIGN_SIZE 4
- #define VRING_DESC_ALIGN_SIZE 16
- #define vring_used_event(vr) ((vr)->avail->ring[(vr)->num])
- #define vring_avail_event(vr) (*(__virtio16 *)&(vr)->used->ring[(vr)->num])
- static __inline__ void vring_init(struct vring *vr, unsigned int num, void *p,
- unsigned long align)
- {
- vr->num = num;
- vr->desc = p;
- vr->avail = p + num*sizeof(struct vring_desc);
- vr->used = (void *)(((uintptr_t)&vr->avail->ring[num] + sizeof(__virtio16)
- + align-1) & ~(align - 1));
- }
- static __inline__ unsigned vring_size(unsigned int num, unsigned long align)
- {
- return ((sizeof(struct vring_desc) * num + sizeof(__virtio16) * (3 + num)
- + align - 1) & ~(align - 1))
- + sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num;
- }
- static __inline__ int vring_need_event(__u16 event_idx, __u16 new_idx, __u16 old)
- {
-
- return (__u16)(new_idx - event_idx - 1) < (__u16)(new_idx - old);
- }
- #endif
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