system.cc revision 9332
1/* 2 * Copyright (c) 2010-2012 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2002-2006 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Ali Saidi 41 */ 42 43#include "arch/arm/linux/atag.hh" 44#include "arch/arm/linux/system.hh" 45#include "arch/arm/isa_traits.hh" 46#include "arch/arm/utility.hh" 47#include "arch/generic/linux/threadinfo.hh" 48#include "base/loader/object_file.hh" 49#include "base/loader/symtab.hh" 50#include "cpu/base.hh" 51#include "cpu/pc_event.hh" 52#include "cpu/thread_context.hh" 53#include "debug/Loader.hh" 54#include "kern/linux/events.hh" 55#include "mem/fs_translating_port_proxy.hh" 56#include "mem/physical.hh" 57#include "sim/stat_control.hh" 58 59using namespace ArmISA; 60using namespace Linux; 61 62LinuxArmSystem::LinuxArmSystem(Params *p) 63 : ArmSystem(p), 64 enableContextSwitchStatsDump(p->enable_context_switch_stats_dump) 65{ 66#ifndef NDEBUG 67 kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic"); 68 if (!kernelPanicEvent) 69 panic("could not find kernel symbol \'panic\'"); 70#endif 71 72 // With ARM udelay() is #defined to __udelay 73 Addr addr = 0; 74 if (kernelSymtab->findAddress("__udelay", addr)) { 75 uDelaySkipEvent = new UDelayEvent(&pcEventQueue, "__udelay", 76 fixFuncEventAddr(addr), 1000, 0); 77 } else { 78 panic("couldn't find kernel symbol \'udelay\'"); 79 } 80 81 // constant arguments to udelay() have some precomputation done ahead of 82 // time. Constant comes from code. 83 if (kernelSymtab->findAddress("__const_udelay", addr)) { 84 constUDelaySkipEvent = new UDelayEvent(&pcEventQueue, "__const_udelay", 85 fixFuncEventAddr(addr), 1000, 107374); 86 } else { 87 panic("couldn't find kernel symbol \'udelay\'"); 88 } 89 90 secDataPtrAddr = 0; 91 secDataAddr = 0; 92 penReleaseAddr = 0; 93 kernelSymtab->findAddress("__secondary_data", secDataPtrAddr); 94 kernelSymtab->findAddress("secondary_data", secDataAddr); 95 kernelSymtab->findAddress("pen_release", penReleaseAddr); 96 97 secDataPtrAddr &= ~ULL(0x7F); 98 secDataAddr &= ~ULL(0x7F); 99 penReleaseAddr &= ~ULL(0x7F); 100} 101 102bool 103LinuxArmSystem::adderBootUncacheable(Addr a) 104{ 105 Addr block = a & ~ULL(0x7F); 106 if (block == secDataPtrAddr || block == secDataAddr || 107 block == penReleaseAddr) 108 return true; 109 return false; 110} 111 112void 113LinuxArmSystem::initState() 114{ 115 // Moved from the constructor to here since it relies on the 116 // address map being resolved in the interconnect 117 118 // Call the initialisation of the super class 119 ArmSystem::initState(); 120 121 // Load symbols at physical address, we might not want 122 // to do this permanently, for but early bootup work 123 // it is helpful. 124 if (params()->early_kernel_symbols) { 125 kernel->loadGlobalSymbols(kernelSymtab, loadAddrMask); 126 kernel->loadGlobalSymbols(debugSymbolTable, loadAddrMask); 127 } 128 129 // Setup boot data structure 130 Addr addr = 0; 131 // Check if the kernel image has a symbol that tells us it supports 132 // device trees. 133 bool kernel_has_fdt_support = 134 kernelSymtab->findAddress("unflatten_device_tree", addr); 135 bool dtb_file_specified = params()->dtb_filename != ""; 136 137 if (kernel_has_fdt_support && dtb_file_specified) { 138 // Kernel supports flattened device tree and dtb file specified. 139 // Using Device Tree Blob to describe system configuration. 140 inform("Loading DTB file: %s\n", params()->dtb_filename); 141 142 ObjectFile *dtb_file = createObjectFile(params()->dtb_filename, true); 143 if (!dtb_file) { 144 fatal("couldn't load DTB file: %s\n", params()->dtb_filename); 145 } 146 dtb_file->setTextBase(params()->atags_addr); 147 dtb_file->loadSections(physProxy); 148 delete dtb_file; 149 } else { 150 // Using ATAGS 151 // Warn if the kernel supports FDT and we haven't specified one 152 if (kernel_has_fdt_support) { 153 assert(!dtb_file_specified); 154 warn("Kernel supports device tree, but no DTB file specified\n"); 155 } 156 // Warn if the kernel doesn't support FDT and we have specified one 157 if (dtb_file_specified) { 158 assert(!kernel_has_fdt_support); 159 warn("DTB file specified, but no device tree support in kernel\n"); 160 } 161 162 AtagCore ac; 163 ac.flags(1); // read-only 164 ac.pagesize(8192); 165 ac.rootdev(0); 166 167 AddrRangeList atagRanges = physmem.getConfAddrRanges(); 168 if (atagRanges.size() != 1) { 169 fatal("Expected a single ATAG memory entry but got %d\n", 170 atagRanges.size()); 171 } 172 AtagMem am; 173 am.memSize(atagRanges.begin()->size()); 174 am.memStart(atagRanges.begin()->start); 175 176 AtagCmdline ad; 177 ad.cmdline(params()->boot_osflags); 178 179 DPRINTF(Loader, "boot command line %d bytes: %s\n", 180 ad.size() <<2, params()->boot_osflags.c_str()); 181 182 AtagNone an; 183 184 uint32_t size = ac.size() + am.size() + ad.size() + an.size(); 185 uint32_t offset = 0; 186 uint8_t *boot_data = new uint8_t[size << 2]; 187 188 offset += ac.copyOut(boot_data + offset); 189 offset += am.copyOut(boot_data + offset); 190 offset += ad.copyOut(boot_data + offset); 191 offset += an.copyOut(boot_data + offset); 192 193 DPRINTF(Loader, "Boot atags was %d bytes in total\n", size << 2); 194 DDUMP(Loader, boot_data, size << 2); 195 196 physProxy.writeBlob(params()->atags_addr, boot_data, size << 2); 197 198 delete[] boot_data; 199 } 200 201 for (int i = 0; i < threadContexts.size(); i++) { 202 threadContexts[i]->setIntReg(0, 0); 203 threadContexts[i]->setIntReg(1, params()->machine_type); 204 threadContexts[i]->setIntReg(2, params()->atags_addr); 205 } 206} 207 208LinuxArmSystem::~LinuxArmSystem() 209{ 210 if (uDelaySkipEvent) 211 delete uDelaySkipEvent; 212 if (constUDelaySkipEvent) 213 delete constUDelaySkipEvent; 214 215 if (dumpStatsPCEvent) 216 delete dumpStatsPCEvent; 217} 218 219LinuxArmSystem * 220LinuxArmSystemParams::create() 221{ 222 return new LinuxArmSystem(this); 223} 224 225void 226LinuxArmSystem::startup() 227{ 228 if (enableContextSwitchStatsDump) { 229 dumpStatsPCEvent = addKernelFuncEvent<DumpStatsPCEvent>("__switch_to"); 230 if (!dumpStatsPCEvent) 231 panic("dumpStatsPCEvent not created!"); 232 233 std::string task_filename = "tasks.txt"; 234 taskFile = simout.create(name() + "." + task_filename); 235 236 for (int i = 0; i < _numContexts; i++) { 237 ThreadContext *tc = threadContexts[i]; 238 uint32_t pid = tc->getCpuPtr()->getPid(); 239 if (pid != Request::invldPid) { 240 mapPid(tc, pid); 241 tc->getCpuPtr()->taskId(taskMap[pid]); 242 } 243 } 244 } 245} 246 247void 248LinuxArmSystem::mapPid(ThreadContext *tc, uint32_t pid) 249{ 250 // Create a new unique identifier for this pid 251 std::map<uint32_t, uint32_t>::iterator itr = taskMap.find(pid); 252 if (itr == taskMap.end()) { 253 uint32_t map_size = taskMap.size(); 254 if (map_size > ContextSwitchTaskId::MaxNormalTaskId + 1) { 255 warn_once("Error out of identifiers for cache occupancy stats"); 256 taskMap[pid] = ContextSwitchTaskId::Unknown; 257 } else { 258 taskMap[pid] = map_size; 259 } 260 } 261} 262 263/** This function is called whenever the the kernel function 264 * "__switch_to" is called to change running tasks. 265 * 266 * r0 = task_struct of the previously running process 267 * r1 = task_info of the previously running process 268 * r2 = task_info of the next process to run 269 */ 270void 271DumpStatsPCEvent::process(ThreadContext *tc) 272{ 273 Linux::ThreadInfo ti(tc); 274 Addr task_descriptor = tc->readIntReg(2); 275 uint32_t pid = ti.curTaskPID(task_descriptor); 276 uint32_t tgid = ti.curTaskTGID(task_descriptor); 277 std::string next_task_str = ti.curTaskName(task_descriptor); 278 279 // Streamline treats pid == -1 as the kernel process. 280 // Also pid == 0 implies idle process (except during Linux boot) 281 int32_t mm = ti.curTaskMm(task_descriptor); 282 bool is_kernel = (mm == 0); 283 if (is_kernel && (pid != 0)) { 284 pid = -1; 285 tgid = -1; 286 next_task_str = "kernel"; 287 } 288 289 LinuxArmSystem* sys = dynamic_cast<LinuxArmSystem *>(tc->getSystemPtr()); 290 if (!sys) { 291 panic("System is not LinuxArmSystem while getting Linux process info!"); 292 } 293 std::map<uint32_t, uint32_t>& taskMap = sys->taskMap; 294 295 // Create a new unique identifier for this pid 296 sys->mapPid(tc, pid); 297 298 // Set cpu task id, output process info, and dump stats 299 tc->getCpuPtr()->taskId(taskMap[pid]); 300 tc->getCpuPtr()->setPid(pid); 301 302 std::ostream* taskFile = sys->taskFile; 303 304 // Task file is read by cache occupancy plotting script or 305 // Streamline conversion script. 306 ccprintf(*taskFile, 307 "tick=%lld %d cpu_id=%d next_pid=%d next_tgid=%d next_task=%s\n", 308 curTick(), taskMap[pid], tc->cpuId(), (int) pid, (int) tgid, 309 next_task_str); 310 taskFile->flush(); 311 312 // Dump and reset statistics 313 Stats::schedStatEvent(true, true, curTick(), 0); 314} 315 316