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#define MCL_ONFAULT 4 /* lock all pages that are faulted in */ 78 79/* 80 * Flags for mlock 81 */ 82#define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */ 83 84#define MADV_NORMAL 0 /* no further special treatment */ 85#define MADV_RANDOM 1 /* expect random page references */ 86#define MADV_SEQUENTIAL 2 /* expect sequential page references */ 87#define MADV_WILLNEED 3 /* will need these pages */ 88#define MADV_DONTNEED 4 /* don't need these pages */ 89 90/* common parameters: try to keep these consistent across architectures */ 91#define MADV_REMOVE 9 /* remove these pages & resources */ 92#define MADV_DONTFORK 10 /* don't inherit across fork */ 93#define MADV_DOFORK 11 /* do inherit across fork */ 94 95#define MADV_MERGEABLE 12 /* KSM may merge identical pages */ 96#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */ 97 98#define MADV_HUGEPAGE 14 /* Worth backing with hugepages */ 99#define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */ 100 101#define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, 102 overrides the coredump filter bits */ 103#define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */ 104 105/* compatibility flags */ 106#define MAP_FILE 0 107 108/* 109 * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. 110 * This gives us 6 bits, which is enough until someone invents 128 bit address 111 * spaces. 112 * 113 * Assume these are all power of twos. 114 * When 0 use the default page size. 115 */ 116#define MAP_HUGE_SHIFT 26 117#define MAP_HUGE_MASK 0x3f 118 119#endif /* _XTENSA_MMAN_H */ 120