arch/mips/include/uapi/asm/mman.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1995, 1999, 2002 by Ralf Baechle
   7  */
   8 #ifndef _ASM_MMAN_H
   9 #define _ASM_MMAN_H
  10
  11 /*
  12  * Protections are chosen from these bits, OR'd together.  The
  13  * implementation does not necessarily support PROT_EXEC or PROT_WRITE
  14  * without PROT_READ.  The only guarantees are that no writing will be
  15  * allowed without PROT_WRITE and no access will be allowed for PROT_NONE.
  16  */
  17 #define PROT_NONE       0x00            /* page can not be accessed */
  18 #define PROT_READ       0x01            /* page can be read */
  19 #define PROT_WRITE      0x02            /* page can be written */
  20 #define PROT_EXEC       0x04            /* page can be executed */
  21 /*                      0x08               reserved for PROT_EXEC_NOFLUSH */
  22 #define PROT_SEM        0x10            /* page may be used for atomic ops */
  23 #define PROT_GROWSDOWN  0x01000000      /* mprotect flag: extend change to start of growsdown vma */
  24 #define PROT_GROWSUP    0x02000000      /* mprotect flag: extend change to end of growsup vma */
  25
  26 /*
  27  * Flags for mmap
  28  */
  29 #define MAP_SHARED      0x001           /* Share changes */
  30 #define MAP_PRIVATE     0x002           /* Changes are private */
  31 #define MAP_TYPE        0x00f           /* Mask for type of mapping */
  32 #define MAP_FIXED       0x010           /* Interpret addr exactly */
  33
  34 /* not used by linux, but here to make sure we don't clash with ABI defines */
  35 #define MAP_RENAME      0x020           /* Assign page to file */
  36 #define MAP_AUTOGROW    0x040           /* File may grow by writing */
  37 #define MAP_LOCAL       0x080           /* Copy on fork/sproc */
  38 #define MAP_AUTORSRV    0x100           /* Logical swap reserved on demand */
  39
  40 /* These are linux-specific */
  41 #define MAP_NORESERVE   0x0400          /* don't check for reservations */
  42 #define MAP_ANONYMOUS   0x0800          /* don't use a file */
  43 #define MAP_GROWSDOWN   0x1000          /* stack-like segment */
  44 #define MAP_DENYWRITE   0x2000          /* ETXTBSY */
  45 #define MAP_EXECUTABLE  0x4000          /* mark it as an executable */
  46 #define MAP_LOCKED      0x8000          /* pages are locked */
  47 #define MAP_POPULATE    0x10000         /* populate (prefault) pagetables */
  48 #define MAP_NONBLOCK    0x20000         /* do not block on IO */
  49 #define MAP_STACK       0x40000         /* give out an address that is best suited for process/thread stacks */
  50 #define MAP_HUGETLB     0x80000         /* create a huge page mapping */
  51
  52 /*
  53  * Flags for msync
  54  */
  55 #define MS_ASYNC        0x0001          /* sync memory asynchronously */
  56 #define MS_INVALIDATE   0x0002          /* invalidate mappings & caches */
  57 #define MS_SYNC         0x0004          /* synchronous memory sync */
  58
  59 /*
  60  * Flags for mlockall
  61  */
  62 #define MCL_CURRENT     1               /* lock all current mappings */
  63 #define MCL_FUTURE      2               /* lock all future mappings */
  64
  65 #define MADV_NORMAL     0               /* no further special treatment */
  66 #define MADV_RANDOM     1               /* expect random page references */
  67 #define MADV_SEQUENTIAL 2               /* expect sequential page references */
  68 #define MADV_WILLNEED   3               /* will need these pages */
  69 #define MADV_DONTNEED   4               /* don't need these pages */
  70
  71 /* common parameters: try to keep these consistent across architectures */
  72 #define MADV_REMOVE     9               /* remove these pages & resources */
  73 #define MADV_DONTFORK   10              /* don't inherit across fork */
  74 #define MADV_DOFORK     11              /* do inherit across fork */
  75
  76 #define MADV_MERGEABLE   12             /* KSM may merge identical pages */
  77 #define MADV_UNMERGEABLE 13             /* KSM may not merge identical pages */
  78 #define MADV_HWPOISON    100            /* poison a page for testing */
  79
  80 #define MADV_HUGEPAGE   14              /* Worth backing with hugepages */
  81 #define MADV_NOHUGEPAGE 15              /* Not worth backing with hugepages */
  82
  83 #define MADV_DONTDUMP   16              /* Explicity exclude from the core dump,
  84                                            overrides the coredump filter bits */
  85 #define MADV_DODUMP     17              /* Clear the MADV_NODUMP flag */
  86
  87 /* compatibility flags */
  88 #define MAP_FILE        0
  89
  90 /*
  91  * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size.
  92  * This gives us 6 bits, which is enough until someone invents 128 bit address
  93  * spaces.
  94  *
  95  * Assume these are all power of twos.
  96  * When 0 use the default page size.
  97  */
  98 #define MAP_HUGE_SHIFT  26
  99 #define MAP_HUGE_MASK   0x3f
 100
 101 #endif /* _ASM_MMAN_H */