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_PACKED_DESC_F_AVAIL 7
28 #define VRING_PACKED_DESC_F_USED 15
29 #define VRING_USED_F_NO_NOTIFY 1
30 #define VRING_AVAIL_F_NO_INTERRUPT 1
31 #define VRING_PACKED_EVENT_FLAG_ENABLE 0x0
32 #define VRING_PACKED_EVENT_FLAG_DISABLE 0x1
33 #define VRING_PACKED_EVENT_FLAG_DESC 0x2
34 #define VRING_PACKED_EVENT_F_WRAP_CTR 15
35 #define VIRTIO_RING_F_INDIRECT_DESC 28
36 #define VIRTIO_RING_F_EVENT_IDX 29
37 #define VRING_AVAIL_ALIGN_SIZE 2
38 #define VRING_USED_ALIGN_SIZE 4
39 #define VRING_DESC_ALIGN_SIZE 16
40 struct vring_desc {
41   __virtio64 addr;
42   __virtio32 len;
43   __virtio16 flags;
44   __virtio16 next;
45 };
46 struct vring_avail {
47   __virtio16 flags;
48   __virtio16 idx;
49   __virtio16 ring[];
50 };
51 struct vring_used_elem {
52   __virtio32 id;
53   __virtio32 len;
54 };
55 typedef struct vring_used_elem __attribute__((aligned(VRING_USED_ALIGN_SIZE))) vring_used_elem_t;
56 struct vring_used {
57   __virtio16 flags;
58   __virtio16 idx;
59   vring_used_elem_t ring[];
60 };
61 typedef struct vring_desc __attribute__((aligned(VRING_DESC_ALIGN_SIZE))) vring_desc_t;
62 typedef struct vring_avail __attribute__((aligned(VRING_AVAIL_ALIGN_SIZE))) vring_avail_t;
63 typedef struct vring_used __attribute__((aligned(VRING_USED_ALIGN_SIZE))) vring_used_t;
64 struct vring {
65   unsigned int num;
66   vring_desc_t * desc;
67   vring_avail_t * avail;
68   vring_used_t * used;
69 };
70 #ifndef VIRTIO_RING_NO_LEGACY
71 #define vring_used_event(vr) ((vr)->avail->ring[(vr)->num])
72 #define vring_avail_event(vr) (* (__virtio16 *) & (vr)->used->ring[(vr)->num])
73 #endif
74 struct vring_packed_desc_event {
75   __le16 off_wrap;
76   __le16 flags;
77 };
78 struct vring_packed_desc {
79   __le64 addr;
80   __le32 len;
81   __le16 id;
82   __le16 flags;
83 };
84 #endif
85