mman.h 4.7 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2. /*
  3. * include/asm-xtensa/mman.h
  4. *
  5. * Xtensa Processor memory-manager definitions
  6. *
  7. * This file is subject to the terms and conditions of the GNU General Public
  8. * License. See the file "COPYING" in the main directory of this archive
  9. * for more details.
  10. *
  11. * Copyright (C) 1995 by Ralf Baechle
  12. * Copyright (C) 2001 - 2005 Tensilica Inc.
  13. */
  14. #ifndef _XTENSA_MMAN_H
  15. #define _XTENSA_MMAN_H
  16. /*
  17. * Protections are chosen from these bits, OR'd together. The
  18. * implementation does not necessarily support PROT_EXEC or PROT_WRITE
  19. * without PROT_READ. The only guarantees are that no writing will be
  20. * allowed without PROT_WRITE and no access will be allowed for PROT_NONE.
  21. */
  22. #define PROT_NONE 0x0 /* page can not be accessed */
  23. #define PROT_READ 0x1 /* page can be read */
  24. #define PROT_WRITE 0x2 /* page can be written */
  25. #define PROT_EXEC 0x4 /* page can be executed */
  26. #define PROT_SEM 0x10 /* page may be used for atomic ops */
  27. #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */
  28. #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end fo growsup vma */
  29. /*
  30. * Flags for mmap
  31. */
  32. /* 0x01 - 0x03 are defined in linux/mman.h */
  33. #define MAP_TYPE 0x00f /* Mask for type of mapping */
  34. #define MAP_FIXED 0x010 /* Interpret addr exactly */
  35. /* not used by linux, but here to make sure we don't clash with ABI defines */
  36. #define MAP_RENAME 0x020 /* Assign page to file */
  37. #define MAP_AUTOGROW 0x040 /* File may grow by writing */
  38. #define MAP_LOCAL 0x080 /* Copy on fork/sproc */
  39. #define MAP_AUTORSRV 0x100 /* Logical swap reserved on demand */
  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. #define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */
  52. #define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be
  53. * uninitialized */
  54. /*
  55. * Flags for msync
  56. */
  57. #define MS_ASYNC 0x0001 /* sync memory asynchronously */
  58. #define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */
  59. #define MS_SYNC 0x0004 /* synchronous memory sync */
  60. /*
  61. * Flags for mlockall
  62. */
  63. #define MCL_CURRENT 1 /* lock all current mappings */
  64. #define MCL_FUTURE 2 /* lock all future mappings */
  65. #define MCL_ONFAULT 4 /* lock all pages that are faulted in */
  66. /*
  67. * Flags for mlock
  68. */
  69. #define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */
  70. #define MADV_NORMAL 0 /* no further special treatment */
  71. #define MADV_RANDOM 1 /* expect random page references */
  72. #define MADV_SEQUENTIAL 2 /* expect sequential page references */
  73. #define MADV_WILLNEED 3 /* will need these pages */
  74. #define MADV_DONTNEED 4 /* don't need these pages */
  75. /* common parameters: try to keep these consistent across architectures */
  76. #define MADV_FREE 8 /* free pages only if memory pressure */
  77. #define MADV_REMOVE 9 /* remove these pages & resources */
  78. #define MADV_DONTFORK 10 /* don't inherit across fork */
  79. #define MADV_DOFORK 11 /* do inherit across fork */
  80. #define MADV_MERGEABLE 12 /* KSM may merge identical pages */
  81. #define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */
  82. #define MADV_HUGEPAGE 14 /* Worth backing with hugepages */
  83. #define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */
  84. #define MADV_DONTDUMP 16 /* Explicity exclude from the core dump,
  85. overrides the coredump filter bits */
  86. #define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */
  87. #define MADV_WIPEONFORK 18 /* Zero memory on fork, child only */
  88. #define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK */
  89. #define MADV_COLD 20 /* deactivate these pages */
  90. #define MADV_PAGEOUT 21 /* reclaim these pages */
  91. #define MADV_POPULATE_READ 22 /* populate (prefault) page tables readable */
  92. #define MADV_POPULATE_WRITE 23 /* populate (prefault) page tables writable */
  93. #define MADV_DONTNEED_LOCKED 24 /* like DONTNEED, but drop locked pages too */
  94. #define MADV_COLLAPSE 25 /* Synchronous hugepage collapse */
  95. /* compatibility flags */
  96. #define MAP_FILE 0
  97. #define PKEY_DISABLE_ACCESS 0x1
  98. #define PKEY_DISABLE_WRITE 0x2
  99. #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\
  100. PKEY_DISABLE_WRITE)
  101. #endif /* _XTENSA_MMAN_H */