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#endif /* _ASM_MMAN_H */ 109