1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 /* 3 * This file is subject to the terms and conditions of the GNU General Public 4 * License. See the file "COPYING" in the main directory of this archive 5 * for more details. 6 * 7 * Copyright (C) 1995, 1999, 2002 by Ralf Baechle 8 */ 9 #ifndef _ASM_MMAN_H 10 #define _ASM_MMAN_H 11 12 /* 13 * Protections are chosen from these bits, OR'd together. The 14 * implementation does not necessarily support PROT_EXEC or PROT_WRITE 15 * without PROT_READ. The only guarantees are that no writing will be 16 * allowed without PROT_WRITE and no access will be allowed for PROT_NONE. 17 */ 18 #define PROT_NONE 0x00 /* page can not be accessed */ 19 #define PROT_READ 0x01 /* page can be read */ 20 #define PROT_WRITE 0x02 /* page can be written */ 21 #define PROT_EXEC 0x04 /* page can be executed */ 22 /* 0x08 reserved for PROT_EXEC_NOFLUSH */ 23 #define PROT_SEM 0x10 /* page may be used for atomic ops */ 24 #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ 25 #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */ 26 27 /* 28 * Flags for mmap 29 */ 30 #define MAP_SHARED 0x001 /* Share changes */ 31 #define MAP_PRIVATE 0x002 /* Changes are private */ 32 #define MAP_SHARED_VALIDATE 0x003 /* share + validate extension flags */ 33 #define MAP_TYPE 0x00f /* Mask for type of mapping */ 34 #define MAP_FIXED 0x010 /* Interpret addr exactly */ 35 36 /* not used by linux, but here to make sure we don't clash with ABI defines */ 37 #define MAP_RENAME 0x020 /* Assign page to file */ 38 #define MAP_AUTOGROW 0x040 /* File may grow by writing */ 39 #define MAP_LOCAL 0x080 /* Copy on fork/sproc */ 40 #define MAP_AUTORSRV 0x100 /* Logical swap reserved on demand */ 41 42 /* These are linux-specific */ 43 #define MAP_NORESERVE 0x0400 /* don't check for reservations */ 44 #define MAP_ANONYMOUS 0x0800 /* don't use a file */ 45 #define MAP_GROWSDOWN 0x1000 /* stack-like segment */ 46 #define MAP_DENYWRITE 0x2000 /* ETXTBSY */ 47 #define MAP_EXECUTABLE 0x4000 /* mark it as an executable */ 48 #define MAP_LOCKED 0x8000 /* pages are locked */ 49 #define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */ 50 #define MAP_NONBLOCK 0x20000 /* do not block on IO */ 51 #define MAP_STACK 0x40000 /* give out an address that is best suited for process/thread stacks */ 52 #define MAP_HUGETLB 0x80000 /* create a huge page mapping */ 53 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 /* 62 * Flags for mlockall 63 */ 64 #define MCL_CURRENT 1 /* lock all current mappings */ 65 #define MCL_FUTURE 2 /* lock all future mappings */ 66 #define MCL_ONFAULT 4 /* lock all pages that are faulted in */ 67 68 /* 69 * Flags for mlock 70 */ 71 #define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */ 72 73 #define MADV_NORMAL 0 /* no further special treatment */ 74 #define MADV_RANDOM 1 /* expect random page references */ 75 #define MADV_SEQUENTIAL 2 /* expect sequential page references */ 76 #define MADV_WILLNEED 3 /* will need these pages */ 77 #define MADV_DONTNEED 4 /* don't need these pages */ 78 79 /* common parameters: try to keep these consistent across architectures */ 80 #define MADV_FREE 8 /* free pages only if memory pressure */ 81 #define MADV_REMOVE 9 /* remove these pages & resources */ 82 #define MADV_DONTFORK 10 /* don't inherit across fork */ 83 #define MADV_DOFORK 11 /* do inherit across fork */ 84 85 #define MADV_MERGEABLE 12 /* KSM may merge identical pages */ 86 #define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */ 87 #define MADV_HWPOISON 100 /* poison a page for testing */ 88 89 #define MADV_HUGEPAGE 14 /* Worth backing with hugepages */ 90 #define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */ 91 92 #define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, 93 overrides the coredump filter bits */ 94 #define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */ 95 96 #define MADV_WIPEONFORK 18 /* Zero memory on fork, child only */ 97 #define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK */ 98 99 /* compatibility flags */ 100 #define MAP_FILE 0 101 102 #define PKEY_DISABLE_ACCESS 0x1 103 #define PKEY_DISABLE_WRITE 0x2 104 #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ 105 PKEY_DISABLE_WRITE) 106 107 #endif /* _ASM_MMAN_H */ 108