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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995, 1999, 2002 by Ralf Baechle
*/
#ifndef _ASM_MMAN_H
#define _ASM_MMAN_H
/*
* Protections are chosen from these bits, OR'd together. The
* implementation does not necessarily support PROT_EXEC or PROT_WRITE
* without PROT_READ. The only guarantees are that no writing will be
* allowed without PROT_WRITE and no access will be allowed for PROT_NONE.
*/
#define PROT_NONE 0x00 /* page can not be accessed */
#define PROT_READ 0x01 /* page can be read */
#define PROT_WRITE 0x02 /* page can be written */
#define PROT_EXEC 0x04 /* page can be executed */
/* 0x08 reserved for PROT_EXEC_NOFLUSH */
#define PROT_SEM 0x10 /* page may be used for atomic ops */
#define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */
#define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */
/*
* Flags for mmap
*/
/* 0x01 - 0x03 are defined in linux/mman.h */
#define MAP_TYPE 0x00f /* Mask for type of mapping */
#define MAP_FIXED 0x010 /* Interpret addr exactly */
/* not used by linux, but here to make sure we don't clash with ABI defines */
#define MAP_RENAME 0x020 /* Assign page to file */
#define MAP_AUTOGROW 0x040 /* File may grow by writing */
#define MAP_LOCAL 0x080 /* Copy on fork/sproc */
#define MAP_AUTORSRV 0x100 /* Logical swap reserved on demand */
/* These are linux-specific */
#define MAP_NORESERVE 0x0400 /* don't check for reservations */
#define MAP_ANONYMOUS 0x0800 /* don't use a file */
#define MAP_GROWSDOWN 0x1000 /* stack-like segment */
#define MAP_DENYWRITE 0x2000 /* ETXTBSY */
#define MAP_EXECUTABLE 0x4000 /* mark it as an executable */
#define MAP_LOCKED 0x8000 /* pages are locked */
#define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x20000 /* do not block on IO */
#define MAP_STACK 0x40000 /* give out an address that is best suited for process/thread stacks */
#define MAP_HUGETLB 0x80000 /* create a huge page mapping */
#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */
/*
* Flags for msync
*/
#define MS_ASYNC 0x0001 /* sync memory asynchronously */
#define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */
#define MS_SYNC 0x0004 /* synchronous memory sync */
/*
* Flags for mlockall
*/
#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
#define MCL_ONFAULT 4 /* lock all pages that are faulted in */
/*
* Flags for mlock
*/
#define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */
#define MADV_NORMAL 0 /* no further special treatment */
#define MADV_RANDOM 1 /* expect random page references */
#define MADV_SEQUENTIAL 2 /* expect sequential page references */
#define MADV_WILLNEED 3 /* will need these pages */
#define MADV_DONTNEED 4 /* don't need these pages */
/* common parameters: try to keep these consistent across architectures */
#define MADV_FREE 8 /* free pages only if memory pressure */
#define MADV_REMOVE 9 /* remove these pages & resources */
#define MADV_DONTFORK 10 /* don't inherit across fork */
#define MADV_DOFORK 11 /* do inherit across fork */
#define MADV_MERGEABLE 12 /* KSM may merge identical pages */
#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */
#define MADV_HWPOISON 100 /* poison a page for testing */
#define MADV_HUGEPAGE 14 /* Worth backing with hugepages */
#define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */
#define MADV_DONTDUMP 16 /* Explicitly exclude from core dump,
overrides the coredump filter bits */
#define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */
#define MADV_WIPEONFORK 18 /* Zero memory on fork, child only */
#define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK */
#define MADV_COLD 20 /* deactivate these pages */
#define MADV_PAGEOUT 21 /* reclaim these pages */
#define MADV_POPULATE_READ 22 /* populate (prefault) page tables readable */
#define MADV_POPULATE_WRITE 23 /* populate (prefault) page tables writable */
#define MADV_DONTNEED_LOCKED 24 /* like DONTNEED, but drop locked pages too */
#define MADV_COLLAPSE 25 /* Synchronous hugepage collapse */
/* compatibility flags */
#define MAP_FILE 0
#define PKEY_DISABLE_ACCESS 0x1
#define PKEY_DISABLE_WRITE 0x2
#define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\
PKEY_DISABLE_WRITE)
#endif /* _ASM_MMAN_H */
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