arch/xtensa/include/asm/mman.h

   1 /*
   2  * include/asm-xtensa/mman.h
   3  *
   4  * Xtensa Processor memory-manager definitions
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  *
  10  * Copyright (C) 1995 by Ralf Baechle
  11  * Copyright (C) 2001 - 2005 Tensilica Inc.
  12  */
  13
  14 #ifndef _XTENSA_MMAN_H
  15 #define _XTENSA_MMAN_H
  16
  17 /*
  18  * Protections are chosen from these bits, OR'd together.  The
  19  * implementation does not necessarily support PROT_EXEC or PROT_WRITE
  20  * without PROT_READ.  The only guarantees are that no writing will be
  21  * allowed without PROT_WRITE and no access will be allowed for PROT_NONE.
  22  */
  23
  24 #define PROT_NONE       0x0             /* page can not be accessed */
  25 #define PROT_READ       0x1             /* page can be read */
  26 #define PROT_WRITE      0x2             /* page can be written */
  27 #define PROT_EXEC       0x4             /* page can be executed */
  28
  29 #define PROT_SEM        0x10            /* page may be used for atomic ops */
  30 #define PROT_GROWSDOWN  0x01000000      /* mprotect flag: extend change to start of growsdown vma */
  31 #define PROT_GROWSUP    0x02000000      /* mprotect flag: extend change to end fo growsup vma */
  32
  33 /*
  34  * Flags for mmap
  35  */
  36 #define MAP_SHARED      0x001           /* Share changes */
  37 #define MAP_PRIVATE     0x002           /* Changes are private */
  38 #define MAP_TYPE        0x00f           /* Mask for type of mapping */
  39 #define MAP_FIXED       0x010           /* Interpret addr exactly */
  40
  41 /* not used by linux, but here to make sure we don't clash with ABI defines */
  42 #define MAP_RENAME      0x020           /* Assign page to file */
  43 #define MAP_AUTOGROW    0x040           /* File may grow by writing */
  44 #define MAP_LOCAL       0x080           /* Copy on fork/sproc */
  45 #define MAP_AUTORSRV    0x100           /* Logical swap reserved on demand */
  46
  47 /* These are linux-specific */
  48 #define MAP_NORESERVE   0x0400          /* don't check for reservations */
  49 #define MAP_ANONYMOUS   0x0800          /* don't use a file */
  50 #define MAP_GROWSDOWN   0x1000          /* stack-like segment */
  51 #define MAP_DENYWRITE   0x2000          /* ETXTBSY */
  52 #define MAP_EXECUTABLE  0x4000          /* mark it as an executable */
  53 #define MAP_LOCKED      0x8000          /* pages are locked */
  54 #define MAP_POPULATE    0x10000         /* populate (prefault) pagetables */
  55 #define MAP_NONBLOCK    0x20000         /* do not block on IO */
  56 #define MAP_STACK       0x40000         /* give out an address that is best suited for process/thread stacks */
  57 #define MAP_HUGETLB     0x80000         /* create a huge page mapping */
  58
  59 /*
  60  * Flags for msync
  61  */
  62 #define MS_ASYNC        0x0001          /* sync memory asynchronously */
  63 #define MS_INVALIDATE   0x0002          /* invalidate mappings & caches */
  64 #define MS_SYNC         0x0004          /* synchronous memory sync */
  65
  66 /*
  67  * Flags for mlockall
  68  */
  69 #define MCL_CURRENT     1               /* lock all current mappings */
  70 #define MCL_FUTURE      2               /* lock all future mappings */
  71
  72 #define MADV_NORMAL     0               /* no further special treatment */
  73 #define MADV_RANDOM     1               /* expect random page references */
  74 #define MADV_SEQUENTIAL 2               /* expect sequential page references */
  75 #define MADV_WILLNEED   3               /* will need these pages */
  76 #define MADV_DONTNEED   4               /* don't need these pages */
  77
  78 /* common parameters: try to keep these consistent across architectures */
  79 #define MADV_REMOVE     9               /* remove these pages & resources */
  80 #define MADV_DONTFORK   10              /* don't inherit across fork */
  81 #define MADV_DOFORK     11              /* do inherit across fork */
  82
  83 #define MADV_MERGEABLE   12             /* KSM may merge identical pages */
  84 #define MADV_UNMERGEABLE 13             /* KSM may not merge identical pages */
  85
  86 #define MADV_HUGEPAGE   14              /* Worth backing with hugepages */
  87 #define MADV_NOHUGEPAGE 15              /* Not worth backing with hugepages */
  88
  89 #define MADV_DONTDUMP   16              /* Explicity exclude from the core dump,
  90                                            overrides the coredump filter bits */
  91 #define MADV_DODUMP     17              /* Clear the MADV_NODUMP flag */
  92
  93 /* compatibility flags */
  94 #define MAP_FILE        0
  95
  96 #endif /* _XTENSA_MMAN_H */