64a7bcd2c4
This cleans up the mmap-ing. This is primarily used for testing since the tests may end up mmap-ing the backing file many times, and we don't want all those earlier mappings lying around. This change also makes the original mmap-ing function close the file it opens, since the man page for mmap explicitly says you can do that and not lose the mapping. That means we don't have to keep track of the file descriptor which corresponds to the mmap-ed file when we do the unmapping, and it's slightly cleaner in general. Change-Id: I90e3e755cebf3d03e2bf644adf8ef3e157236172 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27750 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Pouya Fotouhi <pfotouhi@ucdavis.edu> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/*
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* Copyright (c) 2011, 2017 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2003-2005 The Regents of The University of Michigan
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* 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 are
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* met: 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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* 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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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "m5_mmap.h"
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void *m5_mem = NULL;
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#ifndef M5OP_ADDR
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#define M5OP_ADDR 0
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#endif
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uint64_t m5op_addr = M5OP_ADDR;
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const char *m5_mmap_dev = "/dev/mem";
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void
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map_m5_mem()
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{
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int fd;
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if (m5_mem) {
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fprintf(stderr, "m5 mem already mapped.\n");
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exit(1);
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}
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fd = open(m5_mmap_dev, O_RDWR | O_SYNC);
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if (fd == -1) {
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fprintf(stderr, "Can't open %s: %s\n", m5_mmap_dev, strerror(errno));
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exit(1);
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}
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m5_mem = mmap(NULL, 0x10000, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
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m5op_addr);
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close(fd);
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if (!m5_mem) {
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fprintf(stderr, "Can't map %s: %s\n", m5_mmap_dev, strerror(errno));
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exit(1);
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}
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}
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void
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unmap_m5_mem()
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{
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if (m5_mem) {
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munmap(m5_mem, 0x10000);
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m5_mem = NULL;
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}
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}
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