1723e8ecc2
Add the special file /sys/devices/system/cpu/online to the files that gem5 knows how to handle in SE mode. This file lists the CPUs that are active. For instance, in an 8 CPU system it is the following: 0-7 This implementation simply returns a file that is 0-%d where %d is the current number of thread contexts. This file is required for C++11 threads with gcc 4.8 and above. Change-Id: I0b566f77e75e9eca480509814d0fd038a231b940 Signed-off-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-on: https://gem5-review.googlesource.com/8902 Reviewed-by: Gabe Black <gabeblack@google.com> Reviewed-by: Brandon Potter <Brandon.Potter@amd.com> Maintainer: Brandon Potter <Brandon.Potter@amd.com>
100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
/*
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* Copyright (c) 2009 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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* Authors: Ali Saidi
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*/
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#include "kern/linux/linux.hh"
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#include <cstdio>
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#include <string>
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#include "cpu/base.hh"
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#include "debug/SyscallVerbose.hh"
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#include "sim/process.hh"
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#include "sim/system.hh"
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int
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Linux::openSpecialFile(std::string path, Process *process,
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ThreadContext *tc)
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{
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DPRINTFR(SyscallVerbose,
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"%d: %s: generic-open: opening special file: %s\n",
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curTick(), tc->getCpuPtr()->name(), path.c_str());
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bool matched = false;
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std::string data;
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if (path.compare(0, 13, "/proc/meminfo") == 0) {
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data = Linux::procMeminfo(process, tc);
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matched = true;
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} else if (path.compare(0, 11, "/etc/passwd") == 0) {
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data = Linux::etcPasswd(process, tc);
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matched = true;
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} else if (path.compare(0, 30, "/sys/devices/system/cpu/online") == 0) {
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data = Linux::cpuOnline(process, tc);
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matched = true;
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}
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if (matched) {
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FILE *f = tmpfile();
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int fd = fileno(f);
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size_t ret M5_VAR_USED = fwrite(data.c_str(), 1, data.size(), f);
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assert(ret == data.size());
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rewind(f);
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return fd;
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} else {
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warn("Attempting to open special file: %s. Ignoring. Simulation may "
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"take un-expected code path or be non-deterministic until proper "
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"handling is implemented.\n", path.c_str());
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errno = EACCES;
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return -1;
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}
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}
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std::string
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Linux::procMeminfo(Process *process, ThreadContext *tc)
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{
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return csprintf("MemTotal:%12d kB\nMemFree: %12d kB\n",
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process->system->memSize() >> 10,
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process->system->freeMemSize() >> 10);
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}
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std::string
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Linux::etcPasswd(Process *process, ThreadContext *tc)
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{
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return csprintf("gem5-user:x:1000:1000:gem5-user,,,:%s:/bin/bash\n",
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process->getcwd());
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}
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std::string
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Linux::cpuOnline(Process *process, ThreadContext *tc)
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{
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return csprintf("0-%d\n",
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tc->getSystemPtr()->numContexts() - 1);
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}
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