1/****************************************************************************
2 ****************************************************************************
3 ***
4 ***   This header was automatically generated from a Linux kernel header
5 ***   of the same name, to make information necessary for userspace to
6 ***   call into the kernel available to libc.  It contains only constants,
7 ***   structures, and macros generated from the original header, and thus,
8 ***   contains no copyrightable information.
9 ***
10 ***   To edit the content of this header, modify the corresponding
11 ***   source file (e.g. under external/kernel-headers/original/) then
12 ***   run bionic/libc/kernel/tools/update_all.py
13 ***
14 ***   Any manual change here will be lost the next time this script will
15 ***   be run. You've been warned!
16 ***
17 ****************************************************************************
18 ****************************************************************************/
19#ifndef _UAPI_LINUX_VIRTIO_RING_H
20#define _UAPI_LINUX_VIRTIO_RING_H
21#include <stdint.h>
22#include <linux/types.h>
23#include <linux/virtio_types.h>
24#define VRING_DESC_F_NEXT 1
25#define VRING_DESC_F_WRITE 2
26#define VRING_DESC_F_INDIRECT 4
27#define VRING_USED_F_NO_NOTIFY 1
28#define VRING_AVAIL_F_NO_INTERRUPT 1
29#define VIRTIO_RING_F_INDIRECT_DESC 28
30#define VIRTIO_RING_F_EVENT_IDX 29
31struct vring_desc {
32  __virtio64 addr;
33  __virtio32 len;
34  __virtio16 flags;
35  __virtio16 next;
36};
37struct vring_avail {
38  __virtio16 flags;
39  __virtio16 idx;
40  __virtio16 ring[];
41};
42struct vring_used_elem {
43  __virtio32 id;
44  __virtio32 len;
45};
46struct vring_used {
47  __virtio16 flags;
48  __virtio16 idx;
49  struct vring_used_elem ring[];
50};
51struct vring {
52  unsigned int num;
53  struct vring_desc * desc;
54  struct vring_avail * avail;
55  struct vring_used * used;
56};
57#define VRING_AVAIL_ALIGN_SIZE 2
58#define VRING_USED_ALIGN_SIZE 4
59#define VRING_DESC_ALIGN_SIZE 16
60#define vring_used_event(vr) ((vr)->avail->ring[(vr)->num])
61#define vring_avail_event(vr) (* (__virtio16 *) & (vr)->used->ring[(vr)->num])
62#endif
63