332 lines
12 KiB
C++
332 lines
12 KiB
C++
/*
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* Copyright (c) 2010-2013, 2016 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) 2002-2006 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 "arch/arm/linux/system.hh"
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#include "arch/arm/isa_traits.hh"
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#include "arch/arm/linux/atag.hh"
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#include "arch/arm/utility.hh"
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#include "arch/generic/linux/threadinfo.hh"
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#include "base/loader/dtb_object.hh"
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#include "base/loader/object_file.hh"
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#include "base/loader/symtab.hh"
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#include "cpu/base.hh"
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#include "cpu/pc_event.hh"
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#include "cpu/thread_context.hh"
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#include "debug/Loader.hh"
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#include "kern/linux/events.hh"
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#include "kern/linux/helpers.hh"
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#include "mem/fs_translating_port_proxy.hh"
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#include "mem/physical.hh"
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#include "sim/stat_control.hh"
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using namespace ArmISA;
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using namespace Linux;
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LinuxArmSystem::LinuxArmSystem(Params *p)
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: GenericArmSystem(p), dumpStatsPCEvent(nullptr),
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enableContextSwitchStatsDump(p->enable_context_switch_stats_dump),
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taskFile(nullptr), kernelPanicEvent(nullptr), kernelOopsEvent(nullptr)
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{
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const std::string dmesg_output = name() + ".dmesg";
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if (p->panic_on_panic) {
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kernelPanicEvent = addKernelFuncEventOrPanic<Linux::KernelPanicEvent>(
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"panic", "Kernel panic in simulated kernel", dmesg_output);
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} else {
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kernelPanicEvent = addKernelFuncEventOrPanic<Linux::DmesgDumpEvent>(
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"panic", "Kernel panic in simulated kernel", dmesg_output);
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}
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if (p->panic_on_oops) {
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kernelOopsEvent = addKernelFuncEventOrPanic<Linux::KernelPanicEvent>(
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"oops_exit", "Kernel oops in guest", dmesg_output);
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} else {
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kernelOopsEvent = addKernelFuncEventOrPanic<Linux::DmesgDumpEvent>(
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"oops_exit", "Kernel oops in guest", dmesg_output);
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}
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// With ARM udelay() is #defined to __udelay
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// newer kernels use __loop_udelay and __loop_const_udelay symbols
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uDelaySkipEvent = addKernelFuncEvent<UDelayEvent>(
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"__loop_udelay", "__udelay", 1000, 0);
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if (!uDelaySkipEvent)
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uDelaySkipEvent = addKernelFuncEventOrPanic<UDelayEvent>(
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"__udelay", "__udelay", 1000, 0);
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// constant arguments to udelay() have some precomputation done ahead of
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// time. Constant comes from code.
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constUDelaySkipEvent = addKernelFuncEvent<UDelayEvent>(
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"__loop_const_udelay", "__const_udelay", 1000, 107374);
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if (!constUDelaySkipEvent)
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constUDelaySkipEvent = addKernelFuncEventOrPanic<UDelayEvent>(
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"__const_udelay", "__const_udelay", 1000, 107374);
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}
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void
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LinuxArmSystem::initState()
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{
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// Moved from the constructor to here since it relies on the
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// address map being resolved in the interconnect
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// Call the initialisation of the super class
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GenericArmSystem::initState();
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// Load symbols at physical address, we might not want
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// to do this permanently, for but early bootup work
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// it is helpful.
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if (params()->early_kernel_symbols) {
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kernel->loadGlobalSymbols(kernelSymtab, 0, 0, loadAddrMask);
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kernel->loadGlobalSymbols(debugSymbolTable, 0, 0, loadAddrMask);
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}
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// Setup boot data structure
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Addr addr = 0;
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// Check if the kernel image has a symbol that tells us it supports
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// device trees.
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bool kernel_has_fdt_support =
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kernelSymtab->findAddress("unflatten_device_tree", addr);
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bool dtb_file_specified = params()->dtb_filename != "";
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if (kernel_has_fdt_support && dtb_file_specified) {
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// Kernel supports flattened device tree and dtb file specified.
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// Using Device Tree Blob to describe system configuration.
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inform("Loading DTB file: %s at address %#x\n", params()->dtb_filename,
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params()->atags_addr + loadAddrOffset);
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ObjectFile *dtb_file = createObjectFile(params()->dtb_filename, true);
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if (!dtb_file) {
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fatal("couldn't load DTB file: %s\n", params()->dtb_filename);
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}
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DtbObject *_dtb_file = dynamic_cast<DtbObject*>(dtb_file);
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if (_dtb_file) {
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if (!_dtb_file->addBootCmdLine(params()->boot_osflags.c_str(),
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params()->boot_osflags.size())) {
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warn("couldn't append bootargs to DTB file: %s\n",
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params()->dtb_filename);
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}
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} else {
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warn("dtb_file cast failed; couldn't append bootargs "
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"to DTB file: %s\n", params()->dtb_filename);
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}
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dtb_file->setTextBase(params()->atags_addr + loadAddrOffset);
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dtb_file->loadSections(physProxy);
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delete dtb_file;
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} else {
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// Using ATAGS
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// Warn if the kernel supports FDT and we haven't specified one
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if (kernel_has_fdt_support) {
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assert(!dtb_file_specified);
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warn("Kernel supports device tree, but no DTB file specified\n");
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}
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// Warn if the kernel doesn't support FDT and we have specified one
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if (dtb_file_specified) {
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assert(!kernel_has_fdt_support);
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warn("DTB file specified, but no device tree support in kernel\n");
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}
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AtagCore ac;
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ac.flags(1); // read-only
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ac.pagesize(8192);
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ac.rootdev(0);
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AddrRangeList atagRanges = physmem.getConfAddrRanges();
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if (atagRanges.size() != 1) {
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fatal("Expected a single ATAG memory entry but got %d\n",
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atagRanges.size());
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}
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AtagMem am;
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am.memSize(atagRanges.begin()->size());
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am.memStart(atagRanges.begin()->start());
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AtagCmdline ad;
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ad.cmdline(params()->boot_osflags);
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DPRINTF(Loader, "boot command line %d bytes: %s\n",
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ad.size() <<2, params()->boot_osflags.c_str());
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AtagNone an;
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uint32_t size = ac.size() + am.size() + ad.size() + an.size();
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uint32_t offset = 0;
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uint8_t *boot_data = new uint8_t[size << 2];
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offset += ac.copyOut(boot_data + offset);
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offset += am.copyOut(boot_data + offset);
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offset += ad.copyOut(boot_data + offset);
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offset += an.copyOut(boot_data + offset);
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DPRINTF(Loader, "Boot atags was %d bytes in total\n", size << 2);
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DDUMP(Loader, boot_data, size << 2);
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physProxy.writeBlob(params()->atags_addr + loadAddrOffset, boot_data,
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size << 2);
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delete[] boot_data;
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}
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// Kernel boot requirements to set up r0, r1 and r2 in ARMv7
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for (int i = 0; i < threadContexts.size(); i++) {
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threadContexts[i]->setIntReg(0, 0);
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threadContexts[i]->setIntReg(1, params()->machine_type);
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threadContexts[i]->setIntReg(2, params()->atags_addr + loadAddrOffset);
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}
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}
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LinuxArmSystem::~LinuxArmSystem()
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{
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if (uDelaySkipEvent)
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delete uDelaySkipEvent;
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if (constUDelaySkipEvent)
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delete constUDelaySkipEvent;
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if (dumpStatsPCEvent)
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delete dumpStatsPCEvent;
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}
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LinuxArmSystem *
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LinuxArmSystemParams::create()
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{
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return new LinuxArmSystem(this);
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}
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void
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LinuxArmSystem::startup()
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{
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if (enableContextSwitchStatsDump) {
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dumpStatsPCEvent = addKernelFuncEvent<DumpStatsPCEvent>("__switch_to");
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if (!dumpStatsPCEvent)
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panic("dumpStatsPCEvent not created!");
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std::string task_filename = "tasks.txt";
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taskFile = simout.create(name() + "." + task_filename);
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for (int i = 0; i < _numContexts; i++) {
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ThreadContext *tc = threadContexts[i];
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uint32_t pid = tc->getCpuPtr()->getPid();
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if (pid != BaseCPU::invldPid) {
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mapPid(tc, pid);
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tc->getCpuPtr()->taskId(taskMap[pid]);
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}
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}
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}
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}
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void
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LinuxArmSystem::mapPid(ThreadContext *tc, uint32_t pid)
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{
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// Create a new unique identifier for this pid
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std::map<uint32_t, uint32_t>::iterator itr = taskMap.find(pid);
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if (itr == taskMap.end()) {
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uint32_t map_size = taskMap.size();
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if (map_size > ContextSwitchTaskId::MaxNormalTaskId + 1) {
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warn_once("Error out of identifiers for cache occupancy stats");
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taskMap[pid] = ContextSwitchTaskId::Unknown;
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} else {
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taskMap[pid] = map_size;
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}
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}
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}
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void
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LinuxArmSystem::dumpDmesg()
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{
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Linux::dumpDmesg(getThreadContext(0), std::cout);
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}
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/** This function is called whenever the the kernel function
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* "__switch_to" is called to change running tasks.
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*
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* r0 = task_struct of the previously running process
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* r1 = task_info of the previously running process
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* r2 = task_info of the next process to run
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*/
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void
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DumpStatsPCEvent::process(ThreadContext *tc)
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{
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Linux::ThreadInfo ti(tc);
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Addr task_descriptor = tc->readIntReg(2);
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uint32_t pid = ti.curTaskPID(task_descriptor);
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uint32_t tgid = ti.curTaskTGID(task_descriptor);
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std::string next_task_str = ti.curTaskName(task_descriptor);
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// Streamline treats pid == -1 as the kernel process.
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// Also pid == 0 implies idle process (except during Linux boot)
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int32_t mm = ti.curTaskMm(task_descriptor);
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bool is_kernel = (mm == 0);
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if (is_kernel && (pid != 0)) {
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pid = -1;
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tgid = -1;
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next_task_str = "kernel";
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}
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LinuxArmSystem* sys = dynamic_cast<LinuxArmSystem *>(tc->getSystemPtr());
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if (!sys) {
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panic("System is not LinuxArmSystem while getting Linux process info!");
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}
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std::map<uint32_t, uint32_t>& taskMap = sys->taskMap;
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// Create a new unique identifier for this pid
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sys->mapPid(tc, pid);
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// Set cpu task id, output process info, and dump stats
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tc->getCpuPtr()->taskId(taskMap[pid]);
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tc->getCpuPtr()->setPid(pid);
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OutputStream* taskFile = sys->taskFile;
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// Task file is read by cache occupancy plotting script or
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// Streamline conversion script.
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ccprintf(*(taskFile->stream()),
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"tick=%lld %d cpu_id=%d next_pid=%d next_tgid=%d next_task=%s\n",
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curTick(), taskMap[pid], tc->cpuId(), (int) pid, (int) tgid,
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next_task_str);
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taskFile->stream()->flush();
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// Dump and reset statistics
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Stats::schedStatEvent(true, true, curTick(), 0);
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}
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