drivers/staging/android/ashmem.h

   1 /*
   2  * include/linux/ashmem.h
   3  *
   4  * Copyright 2008 Google Inc.
   5  * Author: Robert Love
   6  *
   7  * This file is dual licensed.  It may be redistributed and/or modified
   8  * under the terms of the Apache 2.0 License OR version 2 of the GNU
   9  * General Public License.
  10  */
  11
  12 #ifndef _LINUX_ASHMEM_H
  13 #define _LINUX_ASHMEM_H
  14
  15 #include <linux/limits.h>
  16 #include <linux/ioctl.h>
  17 #include <linux/compat.h>
  18
  19 #define ASHMEM_NAME_LEN         256
  20
  21 #define ASHMEM_NAME_DEF         "dev/ashmem"
  22
  23 /* Return values from ASHMEM_PIN: Was the mapping purged while unpinned? */
  24 #define ASHMEM_NOT_PURGED       0
  25 #define ASHMEM_WAS_PURGED       1
  26
  27 /* Return values from ASHMEM_GET_PIN_STATUS: Is the mapping pinned? */
  28 #define ASHMEM_IS_UNPINNED      0
  29 #define ASHMEM_IS_PINNED        1
  30
  31 struct ashmem_pin {
  32         __u32 offset;   /* offset into region, in bytes, page-aligned */
  33         __u32 len;      /* length forward from offset, in bytes, page-aligned */
  34 };
  35
  36 #define __ASHMEMIOC             0x77
  37
  38 #define ASHMEM_SET_NAME         _IOW(__ASHMEMIOC, 1, char[ASHMEM_NAME_LEN])
  39 #define ASHMEM_GET_NAME         _IOR(__ASHMEMIOC, 2, char[ASHMEM_NAME_LEN])
  40 #define ASHMEM_SET_SIZE         _IOW(__ASHMEMIOC, 3, size_t)
  41 #define ASHMEM_GET_SIZE         _IO(__ASHMEMIOC, 4)
  42 #define ASHMEM_SET_PROT_MASK    _IOW(__ASHMEMIOC, 5, unsigned long)
  43 #define ASHMEM_GET_PROT_MASK    _IO(__ASHMEMIOC, 6)
  44 #define ASHMEM_PIN              _IOW(__ASHMEMIOC, 7, struct ashmem_pin)
  45 #define ASHMEM_UNPIN            _IOW(__ASHMEMIOC, 8, struct ashmem_pin)
  46 #define ASHMEM_GET_PIN_STATUS   _IO(__ASHMEMIOC, 9)
  47 #define ASHMEM_PURGE_ALL_CACHES _IO(__ASHMEMIOC, 10)
  48
  49 /* support of 32bit userspace on 64bit platforms */
  50 #ifdef CONFIG_COMPAT
  51 #define COMPAT_ASHMEM_SET_SIZE          _IOW(__ASHMEMIOC, 3, compat_size_t)
  52 #define COMPAT_ASHMEM_SET_PROT_MASK     _IOW(__ASHMEMIOC, 5, unsigned int)
  53 #endif
  54
  55 #endif  /* _LINUX_ASHMEM_H */