1 /* 2 * include/asm-xtensa/mman.h 3 * 4 * Xtensa Processor memory-manager definitions 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 * 10 * Copyright (C) 1995 by Ralf Baechle 11 * Copyright (C) 2001 - 2005 Tensilica Inc. 12 */ 13 14 #ifndef _XTENSA_MMAN_H 15 #define _XTENSA_MMAN_H 16 17 /* 18 * Protections are chosen from these bits, OR'd together. The 19 * implementation does not necessarily support PROT_EXEC or PROT_WRITE 20 * without PROT_READ. The only guarantees are that no writing will be 21 * allowed without PROT_WRITE and no access will be allowed for PROT_NONE. 22 */ 23 24 #define PROT_NONE 0x0 /* page can not be accessed */ 25 #define PROT_READ 0x1 /* page can be read */ 26 #define PROT_WRITE 0x2 /* page can be written */ 27 #define PROT_EXEC 0x4 /* page can be executed */ 28 29 #define PROT_SEM 0x10 /* page may be used for atomic ops */ 30 #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ 31 #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end fo growsup vma */ 32 33 /* 34 * Flags for mmap 35 */ 36 #define MAP_SHARED 0x001 /* Share changes */ 37 #define MAP_PRIVATE 0x002 /* Changes are private */ 38 #define MAP_TYPE 0x00f /* Mask for type of mapping */ 39 #define MAP_FIXED 0x010 /* Interpret addr exactly */ 40 41 /* not used by linux, but here to make sure we don't clash with ABI defines */ 42 #define MAP_RENAME 0x020 /* Assign page to file */ 43 #define MAP_AUTOGROW 0x040 /* File may grow by writing */ 44 #define MAP_LOCAL 0x080 /* Copy on fork/sproc */ 45 #define MAP_AUTORSRV 0x100 /* Logical swap reserved on demand */ 46 47 /* These are linux-specific */ 48 #define MAP_NORESERVE 0x0400 /* don't check for reservations */ 49 #define MAP_ANONYMOUS 0x0800 /* don't use a file */ 50 #define MAP_GROWSDOWN 0x1000 /* stack-like segment */ 51 #define MAP_DENYWRITE 0x2000 /* ETXTBSY */ 52 #define MAP_EXECUTABLE 0x4000 /* mark it as an executable */ 53 #define MAP_LOCKED 0x8000 /* pages are locked */ 54 #define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */ 55 #define MAP_NONBLOCK 0x20000 /* do not block on IO */ 56 #define MAP_STACK 0x40000 /* give out an address that is best suited for process/thread stacks */ 57 #define MAP_HUGETLB 0x80000 /* create a huge page mapping */ 58 #ifdef CONFIG_MMAP_ALLOW_UNINITIALIZED 59 # define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be 60 * uninitialized */ 61 #else 62 # define MAP_UNINITIALIZED 0x0 /* Don't support this flag */ 63 #endif 64 65 /* 66 * Flags for msync 67 */ 68 #define MS_ASYNC 0x0001 /* sync memory asynchronously */ 69 #define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */ 70 #define MS_SYNC 0x0004 /* synchronous memory sync */ 71 72 /* 73 * Flags for mlockall 74 */ 75 #define MCL_CURRENT 1 /* lock all current mappings */ 76 #define MCL_FUTURE 2 /* lock all future mappings */ 77 78 #define MADV_NORMAL 0 /* no further special treatment */ 79 #define MADV_RANDOM 1 /* expect random page references */ 80 #define MADV_SEQUENTIAL 2 /* expect sequential page references */ 81 #define MADV_WILLNEED 3 /* will need these pages */ 82 #define MADV_DONTNEED 4 /* don't need these pages */ 83 84 /* common parameters: try to keep these consistent across architectures */ 85 #define MADV_REMOVE 9 /* remove these pages & resources */ 86 #define MADV_DONTFORK 10 /* don't inherit across fork */ 87 #define MADV_DOFORK 11 /* do inherit across fork */ 88 89 #define MADV_MERGEABLE 12 /* KSM may merge identical pages */ 90 #define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */ 91 92 #define MADV_HUGEPAGE 14 /* Worth backing with hugepages */ 93 #define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */ 94 95 #define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, 96 overrides the coredump filter bits */ 97 #define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */ 98 99 /* compatibility flags */ 100 #define MAP_FILE 0 101 102 /* 103 * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. 104 * This gives us 6 bits, which is enough until someone invents 128 bit address 105 * spaces. 106 * 107 * Assume these are all power of twos. 108 * When 0 use the default page size. 109 */ 110 #define MAP_HUGE_SHIFT 26 111 #define MAP_HUGE_MASK 0x3f 112 113 #endif /* _XTENSA_MMAN_H */ 114