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root/include/asm-xtensa/mman.h

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/*
 * include/asm-xtensa/mman.h
 *
 * Xtensa Processor memory-manager definitions
 *
 * 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 by Ralf Baechle
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_MMAN_H
#define _XTENSA_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       0x0             /* page can not be accessed */
#define PROT_READ       0x1             /* page can be read */
#define PROT_WRITE      0x2             /* page can be written */
#define PROT_EXEC       0x4             /* page can be executed */

#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 fo 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 */

/*
 * 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 */

/* compatibility flags */
#define MAP_FILE        0

#endif /* _XTENSA_MMAN_H */

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