mman.h

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/*
 * 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
 */
#define MAP_SHARED  0x001       /* Share changes */
#define MAP_PRIVATE 0x002       /* Changes are private */
#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 */

/*
 * 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 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_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      /* Explicity exclude from the core dump,
                       overrides the coredump filter bits */
#define MADV_DODUMP 17      /* Clear the MADV_NODUMP flag */

/* compatibility flags */
#define MAP_FILE    0

#endif /* _ASM_MMAN_H */