1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 /* 3 * include/asm-xtensa/mman.h 4 * 5 * Xtensa Processor memory-manager definitions 6 * 7 * This file is subject to the terms and conditions of the GNU General Public 8 * License. See the file "COPYING" in the main directory of this archive 9 * for more details. 10 * 11 * Copyright (C) 1995 by Ralf Baechle 12 * Copyright (C) 2001 - 2005 Tensilica Inc. 13 */ 14 15 #ifndef _XTENSA_MMAN_H 16 #define _XTENSA_MMAN_H 17 18 /* 19 * Protections are chosen from these bits, OR'd together. The 20 * implementation does not necessarily support PROT_EXEC or PROT_WRITE 21 * without PROT_READ. The only guarantees are that no writing will be 22 * allowed without PROT_WRITE and no access will be allowed for PROT_NONE. 23 */ 24 25 #define PROT_NONE 0x0 /* page can not be accessed */ 26 #define PROT_READ 0x1 /* page can be read */ 27 #define PROT_WRITE 0x2 /* page can be written */ 28 #define PROT_EXEC 0x4 /* page can be executed */ 29 30 #define PROT_SEM 0x10 /* page may be used for atomic ops */ 31 #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ 32 #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end fo growsup vma */ 33 34 /* 35 * Flags for mmap 36 */ 37 /* 0x01 - 0x03 are defined in linux/mman.h */ 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 #define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */ 59 #define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be 60 * uninitialized */ 61 62 /* 63 * Flags for msync 64 */ 65 #define MS_ASYNC 0x0001 /* sync memory asynchronously */ 66 #define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */ 67 #define MS_SYNC 0x0004 /* synchronous memory sync */ 68 69 /* 70 * Flags for mlockall 71 */ 72 #define MCL_CURRENT 1 /* lock all current mappings */ 73 #define MCL_FUTURE 2 /* lock all future mappings */ 74 #define MCL_ONFAULT 4 /* lock all pages that are faulted in */ 75 76 /* 77 * Flags for mlock 78 */ 79 #define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */ 80 81 #define MADV_NORMAL 0 /* no further special treatment */ 82 #define MADV_RANDOM 1 /* expect random page references */ 83 #define MADV_SEQUENTIAL 2 /* expect sequential page references */ 84 #define MADV_WILLNEED 3 /* will need these pages */ 85 #define MADV_DONTNEED 4 /* don't need these pages */ 86 87 /* common parameters: try to keep these consistent across architectures */ 88 #define MADV_FREE 8 /* free pages only if memory pressure */ 89 #define MADV_REMOVE 9 /* remove these pages & resources */ 90 #define MADV_DONTFORK 10 /* don't inherit across fork */ 91 #define MADV_DOFORK 11 /* do inherit across fork */ 92 93 #define MADV_MERGEABLE 12 /* KSM may merge identical pages */ 94 #define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */ 95 96 #define MADV_HUGEPAGE 14 /* Worth backing with hugepages */ 97 #define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */ 98 99 #define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, 100 overrides the coredump filter bits */ 101 #define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */ 102 103 #define MADV_WIPEONFORK 18 /* Zero memory on fork, child only */ 104 #define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK */ 105 106 #define MADV_COLD 20 /* deactivate these pages */ 107 #define MADV_PAGEOUT 21 /* reclaim these pages */ 108 109 /* compatibility flags */ 110 #define MAP_FILE 0 111 112 #define PKEY_DISABLE_ACCESS 0x1 113 #define PKEY_DISABLE_WRITE 0x2 114 #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ 115 PKEY_DISABLE_WRITE) 116 117 #endif /* _XTENSA_MMAN_H */ 118