mmap implementation was Re: [PATCH 2/4] sys/mman.h: New file. Clean up and add supporting stubs
Joel Sherrill
joel.sherrill at oarcorp.com
Fri Nov 21 15:09:43 UTC 2014
Chris, Gedate.. please fill in gaps.
On 11/21/2014 4:06 AM, Thomas Kim wrote:
> Dear Joel,
>
> I am sorry. please let me know how to download these patch
> codes(source code, makefile.am <http://makefile.am>, pre-install.am
> <http://pre-install.am>, etc) for mmap implementation.
>
> At this time, I am modified makefile.am <http://makefile.am> for
> integrating mmp source code in gsoc2011-rtems-mmu-support-project.
> but, I was failed in building process.
>
Gedare should really comment since he mentored that. I took
the sys/mman.h from one of Chris' projects. But I can't
find it this morning.
I recall the GSoC project ended up working on MMU framework
and some target support. There was a lot of infrastructure work
to begin to think about mmap().
Chris has an implementation of some of the capabilities but I don't
recall which git repo. I thought about merging that code but it
doesn't have tests, documentation or confdefs.h support so just
brought over the header and added stubs.
>
> Please advise me.
>
> Best Regards.
> Thomas Kim
>
>
> 2014-11-20 11:37 GMT+09:00 Joel Sherrill <joel.sherrill at oarcorp.com
> <mailto:joel.sherrill at oarcorp.com>>:
>
>
>
> On November 19, 2014 8:31:46 PM CST, Gedare Bloom
> <gedare at rtems.org <mailto:gedare at rtems.org>> wrote:
> >OK great
>
> I have an updated version of the patch. Something wasn't right
> with the mskefile that showed up later. Not sure how it built
> before. :(
>
>
> >On Wed, Nov 19, 2014 at 5:04 PM, Joel Sherrill
> ><joel.sherrill at oarcorp.com <mailto:joel.sherrill at oarcorp.com>> wrote:
> >>
> >> On 11/19/2014 2:55 PM, Gedare Bloom wrote:
> >>> Is this the same one that Chris has had in use before? (I
> think that
> >>> is who had one in use..)
> >> Yes. You wanted it in rtems to avoid me having to add a
> prototype to
> >a file
> >> to avoid a warning.
> >>
> >> I didn't integrate his implementation but only his .h file and
> stubs.
> >His
> >> implementation will need the addition of tests and code in
> >confdefs.h.
> >>
> >> --joel
> >>
> >>> -Gedare
> >>>
> >>> On Wed, Nov 19, 2014 at 2:59 PM, Joel Sherrill
> >>> <joel.sherrill at oarcorp.com <mailto:joel.sherrill at oarcorp.com>>
> wrote:
> >>>> * Makefile.am updated and preinstall.am
> <http://preinstall.am> regenerated.
> >>>> * mprotect.c had a prototype removed now that we have
> >mman.h
> >>>> * mmap.c, munmap.c: New stub files.
> >>>> ---
> >>>> cpukit/posix/Makefile.am | 5 ++
> >>>> cpukit/posix/include/sys/mman.h | 189
> >++++++++++++++++++++++++++++++++++++++++
> >>>> cpukit/posix/preinstall.am <http://preinstall.am> | 9 ++
> >>>> cpukit/posix/src/mmap.c | 26 ++++++
> >>>> cpukit/posix/src/mprotect.c | 10 +--
> >>>> cpukit/posix/src/munmap.c | 30 +++++++
> >>>> 6 files changed, 261 insertions(+), 8 deletions(-)
> >>>> create mode 100644 cpukit/posix/include/sys/mman.h
> >>>> create mode 100644 cpukit/posix/src/mmap.c
> >>>> create mode 100644 cpukit/posix/src/munmap.c
> >>>>
> >>>> diff --git a/cpukit/posix/Makefile.am b/cpukit/posix/Makefile.am
> >>>> index 346b65a..b3be07c 100644
> >>>> --- a/cpukit/posix/Makefile.am
> >>>> +++ b/cpukit/posix/Makefile.am
> >>>> @@ -21,6 +21,9 @@ include_rtems_posix_HEADERS +=
> >include/rtems/posix/keyimpl.h
> >>>> include_rtems_posix_HEADERS += include/rtems/posix/config.h
> >>>> include_rtems_posix_HEADERS += include/rtems/posix/posixapi.h
> >>>>
> >>>> +include_sysdir = $(includedir)/sys
> >>>> +include_sys_HEADERS = include/sys/mman.h
> >>>> +
> >>>> if HAS_PTHREADS
> >>>> # include
> >>>> include_HEADERS = include/aio.h
> >>>> @@ -91,7 +94,9 @@ libposix_a_SOURCES += src/cond.c
> >src/condattrdestroy.c \
> >>>> src/condtimedwait.c src/condwait.c src/condwaitsupp.c
> >src/condget.c
> >>>>
> >>>> ## MEMORY_C_FILES
> >>>> +libposix_a_SOURCES += src/mmap.c
> >>>> libposix_a_SOURCES += src/mprotect.c
> >>>> +libposix_a_SOURCES += src/munmap.c
> >>>>
> >>>> ## MESSAGE_QUEUE_C_FILES
> >>>> libposix_a_SOURCES += src/mqueue.c src/mqueueclose.c \
> >>>> diff --git a/cpukit/posix/include/sys/mman.h
> >b/cpukit/posix/include/sys/mman.h
> >>>> new file mode 100644
> >>>> index 0000000..ddf34cc
> >>>> --- /dev/null
> >>>> +++ b/cpukit/posix/include/sys/mman.h
> >>>> @@ -0,0 +1,189 @@
> >>>> +/* $NetBSD: mman.h,v 1.36 2005/09/13 01:42:51 christos Exp $
> > */
> >>>> +
> >>>> +/*-
> >>>> + * Copyright (c) 1982, 1986, 1993
> >>>> + * The Regents of the University of California. All rights
> >reserved.
> >>>> + *
> >>>> + * Redistribution and use in source and binary forms, with or
> >without
> >>>> + * modification, are permitted provided that the following
> >conditions
> >>>> + * are met:
> >>>> + * 1. Redistributions of source code must retain the above
> >copyright
> >>>> + * notice, this list of conditions and the following
> >disclaimer.
> >>>> + * 2. Redistributions in binary form must reproduce the above
> >copyright
> >>>> + * notice, this list of conditions and the following
> disclaimer
> >in the
> >>>> + * documentation and/or other materials provided with the
> >distribution.
> >>>> + * 3. Neither the name of the University nor the names of its
> >contributors
> >>>> + * may be used to endorse or promote products derived
> from this
> >software
> >>>> + * without specific prior written permission.
> >>>> + *
> >>>> + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS
> ``AS
> >IS'' AND
> >>>> + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
> >TO, THE
> >>>> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
> >PARTICULAR PURPOSE
> >>>> + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
> CONTRIBUTORS
> >BE LIABLE
> >>>> + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> >CONSEQUENTIAL
> >>>> + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
> >SUBSTITUTE GOODS
> >>>> + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
> >INTERRUPTION)
> >>>> + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
> >CONTRACT, STRICT
> >>>> + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> ARISING
> >IN ANY WAY
> >>>> + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
> >POSSIBILITY OF
> >>>> + * SUCH DAMAGE.
> >>>> + *
> >>>> + * @(#)mman.h 8.2 (Berkeley) 1/9/95
> >>>> + */
> >>>> +
> >>>> +#ifndef _SYS_MMAN_H_
> >>>> +#define _SYS_MMAN_H_
> >>>> +
> >>>> +#ifdef __rtems__
> >>>> +
> >>>> +#include <inttypes.h>
> >>>> +#include <stddef.h>
> >>>> +#include <sys/types.h>
> >>>> +
> >>>> +#else /* __rtems__ */
> >>>> +#include <sys/featuretest.h>
> >>>> +
> >>>> +#include <machine/ansi.h>
> >>>> +
> >>>> +#ifdef _BSD_SIZE_T_
> >>>> +typedef _BSD_SIZE_T_ size_t;
> >>>> +#undef _BSD_SIZE_T_
> >>>> +#endif
> >>>> +
> >>>> +#include <sys/ansi.h>
> >>>> +
> >>>> +#ifndef mode_t
> >>>> +typedef __mode_t mode_t;
> >>>> +#define mode_t __mode_t
> >>>> +#endif
> >>>> +
> >>>> +#ifndef off_t
> >>>> +typedef __off_t off_t; /* file offset */
> >>>> +#define off_t __off_t
> >>>> +#endif
> >>>> +#endif /* __rtems__ */
> >>>> +
> >>>> +
> >>>> +/*
> >>>> + * Protections are chosen from these bits, or-ed together
> >>>> + */
> >>>> +#define PROT_NONE 0x00 /* no permissions */
> >>>> +#define PROT_READ 0x01 /* pages can be read */
> >>>> +#define PROT_WRITE 0x02 /* pages can be
> written */
> >>>> +#define PROT_EXEC 0x04 /* pages can be
> executed */
> >>>> +
> >>>> +/*
> >>>> + * Flags contain sharing type and options.
> >>>> + * Sharing types; choose one.
> >>>> + */
> >>>> +#define MAP_SHARED 0x0001 /* share changes */
> >>>> +#define MAP_PRIVATE 0x0002 /* changes are private */
> >>>> +
> >>>> +#ifdef _KERNEL
> >>>> +/*
> >>>> + * Deprecated flag; these are treated as MAP_PRIVATE
> internally by
> >>>> + * the kernel.
> >>>> + */
> >>>> +#define MAP_COPY 0x0004 /* "copy" region at mmap
> >time */
> >>>> +#endif
> >>>> +
> >>>> +/*
> >>>> + * Other flags
> >>>> + */
> >>>> +#define MAP_FIXED 0x0010 /* map addr must be
> exactly
> >as requested */
> >>>> +#define MAP_RENAME 0x0020 /* Sun: rename private
> >pages to file */
> >>>> +#define MAP_NORESERVE 0x0040 /* Sun: don't reserve
> >needed swap area */
> >>>> +#define MAP_INHERIT 0x0080 /* region is retained
> after
> >exec */
> >>>> +#define MAP_HASSEMAPHORE 0x0200 /* region may contain
> >semaphores */
> >>>> +#define MAP_TRYFIXED 0x0400 /* attempt hint address,
> >even within break */
> >>>> +#define MAP_WIRED 0x0800 /* mlock() mapping
> when it
> >is established */
> >>>> +
> >>>> +/*
> >>>> + * Mapping type
> >>>> + */
> >>>> +#define MAP_FILE 0x0000 /* map from file
> (default)
> >*/
> >>>> +#define MAP_ANON 0x1000 /* allocated from memory,
> >swap space */
> >>>> +
> >>>> +/*
> >>>> + * Alignment (expressed in log2). Must be >=
> log2(PAGE_SIZE) and
> >>>> + * < # bits in a pointer (26 (acorn26), 32 or 64).
> >>>> + */
> >>>> +#define MAP_ALIGNED(n) ((n) <<
> >MAP_ALIGNMENT_SHIFT)
> >>>> +#define MAP_ALIGNMENT_SHIFT 24
> >>>> +#define MAP_ALIGNMENT_MASK MAP_ALIGNED(0xff)
> >>>> +#define MAP_ALIGNMENT_64KB MAP_ALIGNED(16) /*
> 2^16 */
> >>>> +#define MAP_ALIGNMENT_16MB MAP_ALIGNED(24) /*
> 2^24 */
> >>>> +#define MAP_ALIGNMENT_4GB MAP_ALIGNED(32) /*
> 2^32 */
> >>>> +#define MAP_ALIGNMENT_1TB MAP_ALIGNED(40) /*
> 2^40 */
> >>>> +#define MAP_ALIGNMENT_256TB MAP_ALIGNED(48) /*
> 2^48 */
> >>>> +#define MAP_ALIGNMENT_64PB MAP_ALIGNED(56) /*
> 2^56 */
> >>>> +
> >>>> +/*
> >>>> + * Error indicator returned by mmap(2)
> >>>> + */
> >>>> +#define MAP_FAILED ((void *) -1) /* mmap()
> failed */
> >>>> +
> >>>> +/*
> >>>> + * Flags to msync
> >>>> + */
> >>>> +#define MS_ASYNC 0x01 /* perform asynchronous
> >writes */
> >>>> +#define MS_INVALIDATE 0x02 /* invalidate cached data
> >*/
> >>>> +#define MS_SYNC 0x04 /* perform synchronous
> >writes */
> >>>> +
> >>>> +/*
> >>>> + * Flags to mlockall
> >>>> + */
> >>>> +#define MCL_CURRENT 0x01 /* lock all pages
> currently
> >mapped */
> >>>> +#define MCL_FUTURE 0x02 /* lock all pages
> mapped in
> >the future */
> >>>> +
> >>>> +#if defined(_NETBSD_SOURCE)
> >>>> +/*
> >>>> + * Advice to madvise
> >>>> + */
> >>>> +#define MADV_NORMAL 0 /* no further special
> >treatment */
> >>>> +#define MADV_RANDOM 1 /* expect random page
> >references */
> >>>> +#define MADV_SEQUENTIAL 2 /* expect sequential page
> >references */
> >>>> +#define MADV_WILLNEED 3 /* will need these
> pages */
> >>>> +#define MADV_DONTNEED 4 /* dont need these
> pages */
> >>>> +#define MADV_SPACEAVAIL 5 /* insure that resources
> >are reserved */
> >>>> +#define MADV_FREE 6 /* pages are empty, free
> >them */
> >>>> +/*
> >>>> + * Flags to minherit
> >>>> + */
> >>>> +#define MAP_INHERIT_SHARE 0 /* share with
> child
> >*/
> >>>> +#define MAP_INHERIT_COPY 1 /* copy into
> child
> >*/
> >>>> +#define MAP_INHERIT_NONE 2 /* absent from
> >child */
> >>>> +#define MAP_INHERIT_DONATE_COPY 3 /* copy and
> delete
> >-- not
> >>>> + implemented in UVM */
> >>>> +#define MAP_INHERIT_DEFAULT MAP_INHERIT_COPY
> >>>> +#endif
> >>>> +
> >>>> +#ifndef _KERNEL
> >>>> +
> >>>> +#include <sys/cdefs.h>
> >>>> +
> >>>> +__BEGIN_DECLS
> >>>> +void *mmap(void *, size_t, int, int, int, off_t);
> >>>> +int munmap(void *, size_t);
> >>>> +int mprotect(void *, size_t, int);
> >>>> +#ifndef __LIBC12_SOURCE__
> >>>> +#if defined(__rtems__)
> >>>> +int msync(void *, size_t, int);
> >>>> +#else
> >>>> +int msync(void *, size_t, int) __RENAME(__msync13);
> >>>> +#endif
> >>>> +#endif
> >>>> +int mlock(const void *, size_t);
> >>>> +int munlock(const void *, size_t);
> >>>> +int mlockall(int);
> >>>> +int munlockall(void);
> >>>> +#if defined(_NETBSD_SOURCE)
> >>>> +int madvise(void *, size_t, int);
> >>>> +int mincore(void *, size_t, char *);
> >>>> +int minherit(void *, size_t, int);
> >>>> +#endif
> >>>> +__END_DECLS
> >>>> +
> >>>> +#endif /* !_KERNEL */
> >>>> +
> >>>> +#endif /* !_SYS_MMAN_H_ */
> >>>> diff --git a/cpukit/posix/preinstall.am <http://preinstall.am>
> >b/cpukit/posix/preinstall.am <http://preinstall.am>
> >>>> index 6e3f2a2..1b65213 100644
> >>>> --- a/cpukit/posix/preinstall.am <http://preinstall.am>
> >>>> +++ b/cpukit/posix/preinstall.am <http://preinstall.am>
> >>>> @@ -43,6 +43,15 @@ $(PROJECT_INCLUDE)/rtems/posix/posixapi.h:
> >include/rtems/posix/posixapi.h $(PROJ
> >>>> $(INSTALL_DATA) $<
> >$(PROJECT_INCLUDE)/rtems/posix/posixapi.h
> >>>> PREINSTALL_FILES += $(PROJECT_INCLUDE)/rtems/posix/posixapi.h
> >>>>
> >>>> +$(PROJECT_INCLUDE)/sys/$(dirstamp):
> >>>> + @$(MKDIR_P) $(PROJECT_INCLUDE)/sys
> >>>> + @: > $(PROJECT_INCLUDE)/sys/$(dirstamp)
> >>>> +PREINSTALL_DIRS += $(PROJECT_INCLUDE)/sys/$(dirstamp)
> >>>> +
> >>>> +$(PROJECT_INCLUDE)/sys/mman.h: include/sys/mman.h
> >$(PROJECT_INCLUDE)/sys/$(dirstamp)
> >>>> + $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/sys/mman.h
> >>>> +PREINSTALL_FILES += $(PROJECT_INCLUDE)/sys/mman.h
> >>>> +
> >>>> if HAS_PTHREADS
> >>>> $(PROJECT_INCLUDE)/aio.h: include/aio.h
> >$(PROJECT_INCLUDE)/$(dirstamp)
> >>>> $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/aio.h
> >>>> diff --git a/cpukit/posix/src/mmap.c b/cpukit/posix/src/mmap.c
> >>>> new file mode 100644
> >>>> index 0000000..2798326
> >>>> --- /dev/null
> >>>> +++ b/cpukit/posix/src/mmap.c
> >>>> @@ -0,0 +1,26 @@
> >>>> +/**
> >>>> + * @file
> >>>> + */
> >>>> +
> >>>> +/*
> >>>> + * COPYRIGHT (c) 2014.
> >>>> + * On-Line Applications Research Corporation (OAR).
> >>>> + *
> >>>> + * The license and distribution terms for this file may be
> >>>> + * found in the file LICENSE in this distribution or at
> >>>> + * http://www.rtems.org/license/LICENSE.
> >>>> + */
> >>>> +
> >>>> +#if HAVE_CONFIG_H
> >>>> +#include "config.h"
> >>>> +#endif
> >>>> +
> >>>> +#include <sys/mman.h>
> >>>> +
> >>>> +int munmap(
> >>>> + void *addr __attribute__((unused)),
> >>>> + size_t length __attribute__((unused))
> >>>> +)
> >>>> +{
> >>>> + return -1;
> >>>> +}
> >>>> diff --git a/cpukit/posix/src/mprotect.c
> >b/cpukit/posix/src/mprotect.c
> >>>> index 51b565e..94bd316 100644
> >>>> --- a/cpukit/posix/src/mprotect.c
> >>>> +++ b/cpukit/posix/src/mprotect.c
> >>>> @@ -28,16 +28,10 @@
> >>>> #endif
> >>>>
> >>>> #include <unistd.h>
> >>>> -
> >>>> -/*
> >>>> - * RTEMS does not have <sys/mman.h> so we need a prototype
> here to
> >>>> - * avoid warnings.
> >>>> - */
> >>>> -
> >>>> -int mprotect( const void *, size_t, int );
> >>>> +#include <sys/mman.h>
> >>>>
> >>>> int mprotect(
> >>>> - const void *addr __attribute__((unused)),
> >>>> + void *addr __attribute__((unused)),
> >>>> size_t len __attribute__((unused)),
> >>>> int prot __attribute__((unused)) )
> >>>> {
> >>>> diff --git a/cpukit/posix/src/munmap.c
> b/cpukit/posix/src/munmap.c
> >>>> new file mode 100644
> >>>> index 0000000..3ebb2f4
> >>>> --- /dev/null
> >>>> +++ b/cpukit/posix/src/munmap.c
> >>>> @@ -0,0 +1,30 @@
> >>>> +/**
> >>>> + * @file
> >>>> + */
> >>>> +
> >>>> +/*
> >>>> + * COPYRIGHT (c) 2014.
> >>>> + * On-Line Applications Research Corporation (OAR).
> >>>> + *
> >>>> + * The license and distribution terms for this file may be
> >>>> + * found in the file LICENSE in this distribution or at
> >>>> + * http://www.rtems.org/license/LICENSE.
> >>>> + */
> >>>> +
> >>>> +#if HAVE_CONFIG_H
> >>>> +#include "config.h"
> >>>> +#endif
> >>>> +
> >>>> +#include <sys/mman.h>
> >>>> +
> >>>> +void *mmap(
> >>>> + void *addr __attribute__((unused)),
> >>>> + size_t lenhth __attribute__((unused)),
> >>>> + int prot __attribute__((unused)),
> >>>> + int flags __attribute__((unused)),
> >>>> + int fildes __attribute__((unused)),
> >>>> + off_t off
> >>>> +)
> >>>> +{
> >>>> + return NULL;
> >>>> +}
> >>>> --
> >>>> 1.9.3
> >>>>
> >>>> _______________________________________________
> >>>> devel mailing list
> >>>> devel at rtems.org <mailto:devel at rtems.org>
> >>>> http://lists.rtems.org/mailman/listinfo/devel
> >>
> >> --
> >> Joel Sherrill, Ph.D. Director of Research & Development
> >> joel.sherrill at OARcorp.com On-Line Applications Research
> >> Ask me about RTEMS: a free RTOS Huntsville AL 35805
> >> Support Available (256) 722-9985
> >>
>
> _______________________________________________
> devel mailing list
> devel at rtems.org <mailto:devel at rtems.org>
> http://lists.rtems.org/mailman/listinfo/devel
>
>
--
Joel Sherrill, Ph.D. Director of Research & Development
joel.sherrill at OARcorp.com On-Line Applications Research
Ask me about RTEMS: a free RTOS Huntsville AL 35805
Support Available (256) 722-9985
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.rtems.org/pipermail/devel/attachments/20141121/3676b14c/attachment-0002.html>
More information about the devel
mailing list