ashmem.h

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/*
 * include/linux/ashmem.h
 *
 * Copyright 2008 Google Inc.
 * Author: Robert Love
 *
 * This file is dual licensed.  It may be redistributed and/or modified
 * under the terms of the Apache 2.0 License OR version 2 of the GNU
 * General Public License.
 */

#ifndef _LINUX_ASHMEM_H
#define _LINUX_ASHMEM_H

#include <linux/limits.h>
#include <linux/ioctl.h>

#define ASHMEM_NAME_LEN     256

#define ASHMEM_NAME_DEF     "dev/ashmem"

/* Return values from ASHMEM_PIN: Was the mapping purged while unpinned? */
#define ASHMEM_NOT_PURGED   0
#define ASHMEM_WAS_PURGED   1

/* Return values from ASHMEM_GET_PIN_STATUS: Is the mapping pinned? */
#define ASHMEM_IS_UNPINNED  0
#define ASHMEM_IS_PINNED    1

struct ashmem_pin {
    __u32 offset;   /* offset into region, in bytes, page-aligned */
    __u32 len;  /* length forward from offset, in bytes, page-aligned */
};

#define __ASHMEMIOC     0x77

#define ASHMEM_SET_NAME     _IOW(__ASHMEMIOC, 1, char[ASHMEM_NAME_LEN])
#define ASHMEM_GET_NAME     _IOR(__ASHMEMIOC, 2, char[ASHMEM_NAME_LEN])
#define ASHMEM_SET_SIZE     _IOW(__ASHMEMIOC, 3, size_t)
#define ASHMEM_GET_SIZE     _IO(__ASHMEMIOC, 4)
#define ASHMEM_SET_PROT_MASK    _IOW(__ASHMEMIOC, 5, unsigned long)
#define ASHMEM_GET_PROT_MASK    _IO(__ASHMEMIOC, 6)
#define ASHMEM_PIN      _IOW(__ASHMEMIOC, 7, struct ashmem_pin)
#define ASHMEM_UNPIN        _IOW(__ASHMEMIOC, 8, struct ashmem_pin)
#define ASHMEM_GET_PIN_STATUS   _IO(__ASHMEMIOC, 9)
#define ASHMEM_PURGE_ALL_CACHES _IO(__ASHMEMIOC, 10)

#endif  /* _LINUX_ASHMEM_H */