0b79eac642
Currently we don't accept writable file mmap()s, as there is no system in place to guarantee dirty buffers would make it back to disk. But we can actually accept MAP_SHARED for PROT_READ mappings, meaning the ranges aren't writable at all (and no private copy is made as with MAP_PRIVATE), as it turns out a fairly large class of usage. . fail writable MAP_SHARED mappings at runtime . reduces some minix-specific patches . lets binutils gold build on minix without further patching Change-Id: If2896c0a555328ac5b324afa706063fc6d86519e
215 lines
7.1 KiB
C
215 lines
7.1 KiB
C
/* $NetBSD: mman.h,v 1.44 2012/01/05 15:19:52 reinoud Exp $ */
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/*-
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)mman.h 8.2 (Berkeley) 1/9/95
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*/
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#ifndef _SYS_MMAN_H_
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#define _SYS_MMAN_H_
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#include <sys/featuretest.h>
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#include <machine/ansi.h>
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#ifdef _BSD_SIZE_T_
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typedef _BSD_SIZE_T_ size_t;
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#undef _BSD_SIZE_T_
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#endif
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#include <sys/ansi.h>
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#ifndef mode_t
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typedef __mode_t mode_t;
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#define mode_t __mode_t
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#endif
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#ifndef off_t
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typedef __off_t off_t; /* file offset */
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#define off_t __off_t
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#endif
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/*
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* Protections are chosen from these bits, or-ed together
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*/
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#define PROT_NONE 0x00 /* no permissions */
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#define PROT_READ 0x01 /* pages can be read */
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#define PROT_WRITE 0x02 /* pages can be written */
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#define PROT_EXEC 0x04 /* pages can be executed */
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/*
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* Flags contain sharing type and options.
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* Sharing types; choose one.
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*/
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#define MAP_SHARED 0x0001 /* share changes */
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#define MAP_PRIVATE 0x0002 /* changes are private */
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#ifdef _KERNEL
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/*
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* Deprecated flag; these are treated as MAP_PRIVATE internally by
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* the kernel.
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*/
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#define MAP_COPY 0x0004 /* "copy" region at mmap time */
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#endif
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/*
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* Other flags
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*/
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#define MAP_FIXED 0x0010 /* map addr must be exactly as requested */
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#define MAP_RENAME 0x0020 /* Sun: rename private pages to file */
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#define MAP_NORESERVE 0x0040 /* Sun: don't reserve needed swap area */
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#define MAP_INHERIT 0x0080 /* region is retained after exec */
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#define MAP_HASSEMAPHORE 0x0200 /* region may contain semaphores */
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#define MAP_TRYFIXED 0x0400 /* attempt hint address, even within break */
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#define MAP_WIRED 0x0800 /* mlock() mapping when it is established */
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/*
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* Mapping type
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*/
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#define MAP_FILE 0x0000 /* map from file (default) */
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#define MAP_ANON 0x1000 /* allocated from memory, swap space */
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#define MAP_STACK 0x2000 /* allocated from memory, swap space (stack) */
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/*
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* Alignment (expressed in log2). Must be >= log2(PAGE_SIZE) and
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* < # bits in a pointer (26 (acorn26), 32 or 64).
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*/
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#define MAP_ALIGNED(n) ((n) << MAP_ALIGNMENT_SHIFT)
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#define MAP_ALIGNMENT_SHIFT 24
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#define MAP_ALIGNMENT_MASK MAP_ALIGNED(0xff)
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#define MAP_ALIGNMENT_64KB MAP_ALIGNED(16) /* 2^16 */
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#define MAP_ALIGNMENT_16MB MAP_ALIGNED(24) /* 2^24 */
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#define MAP_ALIGNMENT_4GB MAP_ALIGNED(32) /* 2^32 */
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#define MAP_ALIGNMENT_1TB MAP_ALIGNED(40) /* 2^40 */
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#define MAP_ALIGNMENT_256TB MAP_ALIGNED(48) /* 2^48 */
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#define MAP_ALIGNMENT_64PB MAP_ALIGNED(56) /* 2^56 */
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#if defined(__minix)
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/*
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* Minix-specific flags
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*/
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#define MAP_UNINITIALIZED 0x040000 /* do not clear memory */
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#define MAP_PREALLOC 0x080000 /* not on-demand */
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#define MAP_CONTIG 0x100000 /* contiguous in physical memory */
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#define MAP_LOWER16M 0x200000 /* physically below 16MB */
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#define MAP_LOWER1M 0x400000 /* physically below 16MB */
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#define MAP_THIRDPARTY 0x800000 /* perform on behalf of any process */
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#endif /* defined(__minix) */
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/*
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* Error indicator returned by mmap(2)
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*/
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#define MAP_FAILED ((void *) -1) /* mmap() failed */
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/*
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* Flags to msync
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*/
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#define MS_ASYNC 0x01 /* perform asynchronous writes */
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#define MS_INVALIDATE 0x02 /* invalidate cached data */
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#define MS_SYNC 0x04 /* perform synchronous writes */
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/*
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* Flags to mlockall
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*/
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#define MCL_CURRENT 0x01 /* lock all pages currently mapped */
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#define MCL_FUTURE 0x02 /* lock all pages mapped in the future */
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/*
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* POSIX memory avissory values.
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* Note: keep consistent with the original defintions below.
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*/
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#define POSIX_MADV_NORMAL 0 /* No further special treatment */
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#define POSIX_MADV_RANDOM 1 /* Expect random page references */
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#define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references */
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#define POSIX_MADV_WILLNEED 3 /* Will need these pages */
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#define POSIX_MADV_DONTNEED 4 /* Don't need these pages */
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#if defined(_NETBSD_SOURCE)
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/*
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* Original advice values, equivalent to POSIX defintions,
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* and few implementation-specific ones.
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*/
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#define MADV_NORMAL POSIX_MADV_NORMAL
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#define MADV_RANDOM POSIX_MADV_RANDOM
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#define MADV_SEQUENTIAL POSIX_MADV_SEQUENTIAL
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#define MADV_WILLNEED POSIX_MADV_WILLNEED
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#define MADV_DONTNEED POSIX_MADV_DONTNEED
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#define MADV_SPACEAVAIL 5 /* Insure that resources are reserved */
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#define MADV_FREE 6 /* Pages are empty, free them */
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/*
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* Flags to minherit
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*/
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#define MAP_INHERIT_SHARE 0 /* share with child */
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#define MAP_INHERIT_COPY 1 /* copy into child */
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#define MAP_INHERIT_NONE 2 /* absent from child */
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#define MAP_INHERIT_DONATE_COPY 3 /* copy and delete -- not
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implemented in UVM */
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#define MAP_INHERIT_DEFAULT MAP_INHERIT_COPY
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#endif
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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void * mmap(void *, size_t, int, int, int, off_t);
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int munmap(void *, size_t);
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int mprotect(void *, size_t, int);
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#ifndef __LIBC12_SOURCE__
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int msync(void *, size_t, int) __RENAME(__msync13);
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#endif
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int mlock(const void *, size_t);
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int munlock(const void *, size_t);
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int mlockall(int);
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int munlockall(void);
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#if defined(_NETBSD_SOURCE)
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int madvise(void *, size_t, int);
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int mincore(void *, size_t, char *);
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int minherit(void *, size_t, int);
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void * mremap(void *, size_t, void *, size_t, int);
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#endif
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int posix_madvise(void *, size_t, int);
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#if defined(__minix) && defined(_MINIX_SYSTEM)
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#include <minix/endpoint.h>
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void * vm_remap(endpoint_t d, endpoint_t s, void *da, void *sa, size_t si);
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void * vm_remap_ro(endpoint_t d, endpoint_t s, void *da, void *sa, size_t si);
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int vm_unmap(endpoint_t endpt, void *addr);
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unsigned long vm_getphys(endpoint_t endpt, void *addr);
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u8_t vm_getrefcount(endpoint_t endpt, void *addr);
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#endif /* defined(__minix) && defined(_MINIX_SYSTEM) */
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__END_DECLS
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#endif /* !_KERNEL */
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#endif /* !_SYS_MMAN_H_ */
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