53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Ashmem compatability for memfd
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*
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* Copyright (c) 2025, Google LLC.
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* Author: Isaac J. Manjarres <isaacmanjarres@google.com>
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*/
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#ifndef _MM_MEMFD_ASHMEM_SHIM_INTERNAL_H
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#define _MM_MEMFD_ASHMEM_SHIM_INTERNAL_H
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#include <linux/compat.h>
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#include <linux/ioctl.h>
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#include <linux/types.h>
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#define ASHMEM_NAME_LEN 256
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/* Return values from ASHMEM_PIN: Was the mapping purged while unpinned? */
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#define ASHMEM_NOT_PURGED 0
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#define ASHMEM_WAS_PURGED 1
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/* Return values from ASHMEM_GET_PIN_STATUS: Is the mapping pinned? */
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#define ASHMEM_IS_UNPINNED 0
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#define ASHMEM_IS_PINNED 1
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struct ashmem_pin {
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__u32 offset; /* offset into region, in bytes, page-aligned */
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__u32 len; /* length forward from offset, in bytes, page-aligned */
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};
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#define __ASHMEMIOC 0x77
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#define ASHMEM_SET_NAME _IOW(__ASHMEMIOC, 1, char[ASHMEM_NAME_LEN])
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#define ASHMEM_GET_NAME _IOR(__ASHMEMIOC, 2, char[ASHMEM_NAME_LEN])
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#define ASHMEM_SET_SIZE _IOW(__ASHMEMIOC, 3, size_t)
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#define ASHMEM_GET_SIZE _IO(__ASHMEMIOC, 4)
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#define ASHMEM_SET_PROT_MASK _IOW(__ASHMEMIOC, 5, unsigned long)
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#define ASHMEM_GET_PROT_MASK _IO(__ASHMEMIOC, 6)
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#define ASHMEM_PIN _IOW(__ASHMEMIOC, 7, struct ashmem_pin)
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#define ASHMEM_UNPIN _IOW(__ASHMEMIOC, 8, struct ashmem_pin)
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#define ASHMEM_GET_PIN_STATUS _IO(__ASHMEMIOC, 9)
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#define ASHMEM_PURGE_ALL_CACHES _IO(__ASHMEMIOC, 10)
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#define ASHMEM_GET_FILE_ID _IOR(__ASHMEMIOC, 11, unsigned long)
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/* support of 32bit userspace on 64bit platforms */
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#ifdef CONFIG_COMPAT
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#define COMPAT_ASHMEM_SET_SIZE _IOW(__ASHMEMIOC, 3, compat_size_t)
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#define COMPAT_ASHMEM_SET_PROT_MASK _IOW(__ASHMEMIOC, 5, unsigned int)
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#endif
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#endif /* _MM_MEMFD_ASHMEM_SHIM_INTERNAL_H */
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