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1 /* SPDX-License-Identifier: GPL-2.0 OR Apache-2.0 */
2 /*
3  * Copyright 2008 Google Inc.
4  * Author: Robert Love
5  */
6
7 #ifndef _UAPI_LINUX_ASHMEM_H
8 #define _UAPI_LINUX_ASHMEM_H
9
10 #include <linux/ioctl.h>
11 #include <linux/types.h>
12
13 #define ASHMEM_NAME_LEN         256
14
15 #define ASHMEM_NAME_DEF         "dev/ashmem"
16
17 /* Return values from ASHMEM_PIN: Was the mapping purged while unpinned? */
18 #define ASHMEM_NOT_PURGED       0
19 #define ASHMEM_WAS_PURGED       1
20
21 /* Return values from ASHMEM_GET_PIN_STATUS: Is the mapping pinned? */
22 #define ASHMEM_IS_UNPINNED      0
23 #define ASHMEM_IS_PINNED        1
24
25 struct ashmem_pin {
26         __u32 offset;   /* offset into region, in bytes, page-aligned */
27         __u32 len;      /* length forward from offset, in bytes, page-aligned */
28 };
29
30 #define __ASHMEMIOC             0x77
31
32 #define ASHMEM_SET_NAME         _IOW(__ASHMEMIOC, 1, char[ASHMEM_NAME_LEN])
33 #define ASHMEM_GET_NAME         _IOR(__ASHMEMIOC, 2, char[ASHMEM_NAME_LEN])
34 #define ASHMEM_SET_SIZE         _IOW(__ASHMEMIOC, 3, size_t)
35 #define ASHMEM_GET_SIZE         _IO(__ASHMEMIOC, 4)
36 #define ASHMEM_SET_PROT_MASK    _IOW(__ASHMEMIOC, 5, unsigned long)
37 #define ASHMEM_GET_PROT_MASK    _IO(__ASHMEMIOC, 6)
38 #define ASHMEM_PIN              _IOW(__ASHMEMIOC, 7, struct ashmem_pin)
39 #define ASHMEM_UNPIN            _IOW(__ASHMEMIOC, 8, struct ashmem_pin)
40 #define ASHMEM_GET_PIN_STATUS   _IO(__ASHMEMIOC, 9)
41 #define ASHMEM_PURGE_ALL_CACHES _IO(__ASHMEMIOC, 10)
42
43 #endif  /* _UAPI_LINUX_ASHMEM_H */
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