diff options
| author | Robert Love <rlove@google.com> | 2010-10-27 14:53:28 +0800 |
|---|---|---|
| committer | Lily Zhang <r58066@freescale.com> | 2010-11-22 09:39:19 +0800 |
| commit | 418f10aecea02315040eba4e3efbd56782f7bfaf (patch) | |
| tree | 278ecc5beaff8267ba3f314b8b18c6f09a4aa4ab /include | |
| parent | 8a7bcef2dba98f1ccb43c93815a8746b656962aa (diff) | |
Android MM: Add anonymous shared memory subsystem
ASHMEM is more similar to shmem and mmap, by
not requiring the specified size to be page aligned,
instead rounding it internally as needed, and does not
need export to tmpfs.
Signed-off-by: Robert Love <rlove@google.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ashmem.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/include/linux/ashmem.h b/include/linux/ashmem.h new file mode 100644 index 000000000000..1976b10ef93e --- /dev/null +++ b/include/linux/ashmem.h @@ -0,0 +1,48 @@ +/* + * 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 */ |