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/* compatibility flags */ 107#define MAP_FILE 0 108 109#define PKEY_DISABLE_ACCESS 0x1 110#define PKEY_DISABLE_WRITE 0x2 111#define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ 112 PKEY_DISABLE_WRITE) 113 114#endif /* _XTENSA_MMAN_H */ 115