linux-headers/asm-generic/mman-common.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef __ASM_GENERIC_MMAN_COMMON_H
   3 #define __ASM_GENERIC_MMAN_COMMON_H
   4
   5 /*
   6  Author: Michael S. Tsirkin <mst@mellanox.co.il>, Mellanox Technologies Ltd.
   7  Based on: asm-xxx/mman.h
   8 */
   9
  10 #define PROT_READ       0x1             /* page can be read */
  11 #define PROT_WRITE      0x2             /* page can be written */
  12 #define PROT_EXEC       0x4             /* page can be executed */
  13 #define PROT_SEM        0x8             /* page may be used for atomic ops */
  14 /*                      0x10               reserved for arch-specific use */
  15 /*                      0x20               reserved for arch-specific use */
  16 #define PROT_NONE       0x0             /* page can not be accessed */
  17 #define PROT_GROWSDOWN  0x01000000      /* mprotect flag: extend change to start of growsdown vma */
  18 #define PROT_GROWSUP    0x02000000      /* mprotect flag: extend change to end of growsup vma */
  19
  20 /* 0x01 - 0x03 are defined in linux/mman.h */
  21 #define MAP_TYPE        0x0f            /* Mask for type of mapping */
  22 #define MAP_FIXED       0x10            /* Interpret addr exactly */
  23 #define MAP_ANONYMOUS   0x20            /* don't use a file */
  24
  25 /* 0x0100 - 0x4000 flags are defined in asm-generic/mman.h */
  26 #define MAP_POPULATE            0x008000        /* populate (prefault) pagetables */
  27 #define MAP_NONBLOCK            0x010000        /* do not block on IO */
  28 #define MAP_STACK               0x020000        /* give out an address that is best suited for process/thread stacks */
  29 #define MAP_HUGETLB             0x040000        /* create a huge page mapping */
  30 #define MAP_SYNC                0x080000 /* perform synchronous page faults for the mapping */
  31 #define MAP_FIXED_NOREPLACE     0x100000        /* MAP_FIXED which doesn't unmap underlying mapping */
  32
  33 #define MAP_UNINITIALIZED 0x4000000     /* For anonymous mmap, memory could be
  34                                          * uninitialized */
  35
  36 /*
  37  * Flags for mlock
  38  */
  39 #define MLOCK_ONFAULT   0x01            /* Lock pages in range after they are faulted in, do not prefault */
  40
  41 #define MS_ASYNC        1               /* sync memory asynchronously */
  42 #define MS_INVALIDATE   2               /* invalidate the caches */
  43 #define MS_SYNC         4               /* synchronous memory sync */
  44
  45 #define MADV_NORMAL     0               /* no further special treatment */
  46 #define MADV_RANDOM     1               /* expect random page references */
  47 #define MADV_SEQUENTIAL 2               /* expect sequential page references */
  48 #define MADV_WILLNEED   3               /* will need these pages */
  49 #define MADV_DONTNEED   4               /* don't need these pages */
  50
  51 /* common parameters: try to keep these consistent across architectures */
  52 #define MADV_FREE       8               /* free pages only if memory pressure */
  53 #define MADV_REMOVE     9               /* remove these pages & resources */
  54 #define MADV_DONTFORK   10              /* don't inherit across fork */
  55 #define MADV_DOFORK     11              /* do inherit across fork */
  56 #define MADV_HWPOISON   100             /* poison a page for testing */
  57 #define MADV_SOFT_OFFLINE 101           /* soft offline page for testing */
  58
  59 #define MADV_MERGEABLE   12             /* KSM may merge identical pages */
  60 #define MADV_UNMERGEABLE 13             /* KSM may not merge identical pages */
  61
  62 #define MADV_HUGEPAGE   14              /* Worth backing with hugepages */
  63 #define MADV_NOHUGEPAGE 15              /* Not worth backing with hugepages */
  64
  65 #define MADV_DONTDUMP   16              /* Explicity exclude from the core dump,
  66                                            overrides the coredump filter bits */
  67 #define MADV_DODUMP     17              /* Clear the MADV_DONTDUMP flag */
  68
  69 #define MADV_WIPEONFORK 18              /* Zero memory on fork, child only */
  70 #define MADV_KEEPONFORK 19              /* Undo MADV_WIPEONFORK */
  71
  72 #define MADV_COLD       20              /* deactivate these pages */
  73 #define MADV_PAGEOUT    21              /* reclaim these pages */
  74
  75 /* compatibility flags */
  76 #define MAP_FILE        0
  77
  78 #define PKEY_DISABLE_ACCESS     0x1
  79 #define PKEY_DISABLE_WRITE      0x2
  80 #define PKEY_ACCESS_MASK        (PKEY_DISABLE_ACCESS |\
  81                                  PKEY_DISABLE_WRITE)
  82
  83 #endif /* __ASM_GENERIC_MMAN_COMMON_H */