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 #define MCL_ONFAULT 4 /* lock all pages that are faulted in */ 65 66 /* 67 * Flags for mlock 68 */ 69 #define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */ 70 71 #define MADV_NORMAL 0 /* no further special treatment */ 72 #define MADV_RANDOM 1 /* expect random page references */ 73 #define MADV_SEQUENTIAL 2 /* expect sequential page references */ 74 #define MADV_WILLNEED 3 /* will need these pages */ 75 #define MADV_DONTNEED 4 /* don't need these pages */ 76 77 /* common parameters: try to keep these consistent across architectures */ 78 #define MADV_FREE 8 /* free pages only if memory pressure */ 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 #define MADV_HWPOISON 100 /* poison a page for testing */ 86 87 #define MADV_HUGEPAGE 14 /* Worth backing with hugepages */ 88 #define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */ 89 90 #define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, 91 overrides the coredump filter bits */ 92 #define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */ 93 94 /* compatibility flags */ 95 #define MAP_FILE 0 96 97 /* 98 * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. 99 * This gives us 6 bits, which is enough until someone invents 128 bit address 100 * spaces. 101 * 102 * Assume these are all power of twos. 103 * When 0 use the default page size. 104 */ 105 #define MAP_HUGE_SHIFT 26 106 #define MAP_HUGE_MASK 0x3f 107 108 #define PKEY_DISABLE_ACCESS 0x1 109 #define PKEY_DISABLE_WRITE 0x2 110 #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ 111 PKEY_DISABLE_WRITE) 112 113 #endif /* _ASM_MMAN_H */ 114