| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 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_REMOVE 9 /* remove these pages & resources */ |
| 79 | #define MADV_DONTFORK 10 /* don't inherit across fork */ |
| 80 | #define MADV_DOFORK 11 /* do inherit across fork */ |
| 81 | |
| 82 | #define MADV_MERGEABLE 12 /* KSM may merge identical pages */ |
| 83 | #define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */ |
| 84 | #define MADV_HWPOISON 100 /* poison a page for testing */ |
| 85 | |
| 86 | #define MADV_HUGEPAGE 14 /* Worth backing with hugepages */ |
| 87 | #define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */ |
| 88 | |
| 89 | #define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, |
| 90 | overrides the coredump filter bits */ |
| 91 | #define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */ |
| 92 | |
| 93 | /* compatibility flags */ |
| 94 | #define MAP_FILE 0 |
| 95 | |
| 96 | /* |
| 97 | * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. |
| 98 | * This gives us 6 bits, which is enough until someone invents 128 bit address |
| 99 | * spaces. |
| 100 | * |
| 101 | * Assume these are all power of twos. |
| 102 | * When 0 use the default page size. |
| 103 | */ |
| 104 | #define MAP_HUGE_SHIFT 26 |
| 105 | #define MAP_HUGE_MASK 0x3f |
| 106 | |
| 107 | #endif /* _ASM_MMAN_H */ |