1/*
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2 * Copyright (c) 2010-2012 ARM Limited
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2 * Copyright (c) 2010-2013 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/dtb_object.hh" 49#include "base/loader/object_file.hh" 50#include "base/loader/symtab.hh" 51#include "cpu/base.hh" 52#include "cpu/pc_event.hh" 53#include "cpu/thread_context.hh" 54#include "debug/Loader.hh" 55#include "kern/linux/events.hh" 56#include "mem/fs_translating_port_proxy.hh" 57#include "mem/physical.hh" 58#include "sim/stat_control.hh" 59 60using namespace ArmISA; 61using namespace Linux; 62 63LinuxArmSystem::LinuxArmSystem(Params *p) 64 : ArmSystem(p), 65 enableContextSwitchStatsDump(p->enable_context_switch_stats_dump),
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66 kernelPanicEvent(NULL), kernelOopsEvent(NULL)
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66 kernelPanicEvent(NULL), kernelOopsEvent(NULL), 67 bootReleaseAddr(p->boot_release_addr) |
68{ 69 if (p->panic_on_panic) { 70 kernelPanicEvent = addKernelFuncEventOrPanic<PanicPCEvent>( 71 "panic", "Kernel panic in simulated kernel"); 72 } else { 73#ifndef NDEBUG 74 kernelPanicEvent = addKernelFuncEventOrPanic<BreakPCEvent>("panic"); 75#endif 76 } 77 78 if (p->panic_on_oops) { 79 kernelOopsEvent = addKernelFuncEventOrPanic<PanicPCEvent>( 80 "oops_exit", "Kernel oops in guest"); 81 } 82 83 // With ARM udelay() is #defined to __udelay 84 // newer kernels use __loop_udelay and __loop_const_udelay symbols 85 uDelaySkipEvent = addKernelFuncEvent<UDelayEvent>( 86 "__loop_udelay", "__udelay", 1000, 0); 87 if(!uDelaySkipEvent) 88 uDelaySkipEvent = addKernelFuncEventOrPanic<UDelayEvent>( 89 "__udelay", "__udelay", 1000, 0); 90 91 // constant arguments to udelay() have some precomputation done ahead of 92 // time. Constant comes from code. 93 constUDelaySkipEvent = addKernelFuncEvent<UDelayEvent>( 94 "__loop_const_udelay", "__const_udelay", 1000, 107374); 95 if(!constUDelaySkipEvent) 96 constUDelaySkipEvent = addKernelFuncEventOrPanic<UDelayEvent>( 97 "__const_udelay", "__const_udelay", 1000, 107374); 98 99 secDataPtrAddr = 0; 100 secDataAddr = 0; 101 penReleaseAddr = 0;
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102 |
103 kernelSymtab->findAddress("__secondary_data", secDataPtrAddr); 104 kernelSymtab->findAddress("secondary_data", secDataAddr); 105 kernelSymtab->findAddress("pen_release", penReleaseAddr);
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106 kernelSymtab->findAddress("secondary_holding_pen_release", pen64ReleaseAddr); |
107 108 secDataPtrAddr &= ~ULL(0x7F); 109 secDataAddr &= ~ULL(0x7F); 110 penReleaseAddr &= ~ULL(0x7F);
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111 pen64ReleaseAddr &= ~ULL(0x7F); 112 bootReleaseAddr = (bootReleaseAddr & ~ULL(0x7F)) + loadAddrOffset; 113 |
114} 115 116bool 117LinuxArmSystem::adderBootUncacheable(Addr a) 118{ 119 Addr block = a & ~ULL(0x7F);
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120 |
121 if (block == secDataPtrAddr || block == secDataAddr ||
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115 block == penReleaseAddr)
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122 block == penReleaseAddr || pen64ReleaseAddr == block || 123 block == bootReleaseAddr) |
124 return true;
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125 |
126 return false; 127} 128 129void 130LinuxArmSystem::initState() 131{ 132 // Moved from the constructor to here since it relies on the 133 // address map being resolved in the interconnect 134 135 // Call the initialisation of the super class 136 ArmSystem::initState(); 137 138 // Load symbols at physical address, we might not want 139 // to do this permanently, for but early bootup work 140 // it is helpful. 141 if (params()->early_kernel_symbols) { 142 kernel->loadGlobalSymbols(kernelSymtab, loadAddrMask); 143 kernel->loadGlobalSymbols(debugSymbolTable, loadAddrMask); 144 } 145 146 // Setup boot data structure 147 Addr addr = 0; 148 // Check if the kernel image has a symbol that tells us it supports 149 // device trees. 150 bool kernel_has_fdt_support = 151 kernelSymtab->findAddress("unflatten_device_tree", addr); 152 bool dtb_file_specified = params()->dtb_filename != ""; 153 154 if (kernel_has_fdt_support && dtb_file_specified) { 155 // Kernel supports flattened device tree and dtb file specified. 156 // Using Device Tree Blob to describe system configuration.
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148 inform("Loading DTB file: %s\n", params()->dtb_filename);
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157 inform("Loading DTB file: %s at address %#x\n", params()->dtb_filename, 158 params()->atags_addr + loadAddrOffset); |
159 160 ObjectFile *dtb_file = createObjectFile(params()->dtb_filename, true); 161 if (!dtb_file) { 162 fatal("couldn't load DTB file: %s\n", params()->dtb_filename); 163 } 164 165 DtbObject *_dtb_file = dynamic_cast<DtbObject*>(dtb_file); 166 167 if (_dtb_file) { 168 if (!_dtb_file->addBootCmdLine(params()->boot_osflags.c_str(), 169 params()->boot_osflags.size())) { 170 warn("couldn't append bootargs to DTB file: %s\n", 171 params()->dtb_filename); 172 } 173 } else { 174 warn("dtb_file cast failed; couldn't append bootargs " 175 "to DTB file: %s\n", params()->dtb_filename); 176 } 177
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168 dtb_file->setTextBase(params()->atags_addr);
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178 dtb_file->setTextBase(params()->atags_addr + loadAddrOffset); |
179 dtb_file->loadSections(physProxy); 180 delete dtb_file; 181 } else { 182 // Using ATAGS 183 // Warn if the kernel supports FDT and we haven't specified one 184 if (kernel_has_fdt_support) { 185 assert(!dtb_file_specified); 186 warn("Kernel supports device tree, but no DTB file specified\n"); 187 } 188 // Warn if the kernel doesn't support FDT and we have specified one 189 if (dtb_file_specified) { 190 assert(!kernel_has_fdt_support); 191 warn("DTB file specified, but no device tree support in kernel\n"); 192 } 193 194 AtagCore ac; 195 ac.flags(1); // read-only 196 ac.pagesize(8192); 197 ac.rootdev(0); 198 199 AddrRangeList atagRanges = physmem.getConfAddrRanges(); 200 if (atagRanges.size() != 1) { 201 fatal("Expected a single ATAG memory entry but got %d\n", 202 atagRanges.size()); 203 } 204 AtagMem am; 205 am.memSize(atagRanges.begin()->size()); 206 am.memStart(atagRanges.begin()->start()); 207 208 AtagCmdline ad; 209 ad.cmdline(params()->boot_osflags); 210 211 DPRINTF(Loader, "boot command line %d bytes: %s\n", 212 ad.size() <<2, params()->boot_osflags.c_str()); 213 214 AtagNone an; 215 216 uint32_t size = ac.size() + am.size() + ad.size() + an.size(); 217 uint32_t offset = 0; 218 uint8_t *boot_data = new uint8_t[size << 2]; 219 220 offset += ac.copyOut(boot_data + offset); 221 offset += am.copyOut(boot_data + offset); 222 offset += ad.copyOut(boot_data + offset); 223 offset += an.copyOut(boot_data + offset); 224 225 DPRINTF(Loader, "Boot atags was %d bytes in total\n", size << 2); 226 DDUMP(Loader, boot_data, size << 2); 227
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218 physProxy.writeBlob(params()->atags_addr, boot_data, size << 2);
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228 physProxy.writeBlob(params()->atags_addr + loadAddrOffset, boot_data, 229 size << 2); |
230 231 delete[] boot_data; 232 } 233
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234 // Kernel boot requirements to set up r0, r1 and r2 in ARMv7 |
235 for (int i = 0; i < threadContexts.size(); i++) { 236 threadContexts[i]->setIntReg(0, 0); 237 threadContexts[i]->setIntReg(1, params()->machine_type);
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226 threadContexts[i]->setIntReg(2, params()->atags_addr);
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238 threadContexts[i]->setIntReg(2, params()->atags_addr + loadAddrOffset); |
239 } 240} 241 242LinuxArmSystem::~LinuxArmSystem() 243{ 244 if (uDelaySkipEvent) 245 delete uDelaySkipEvent; 246 if (constUDelaySkipEvent) 247 delete constUDelaySkipEvent; 248 249 if (dumpStatsPCEvent) 250 delete dumpStatsPCEvent; 251} 252 253LinuxArmSystem * 254LinuxArmSystemParams::create() 255{ 256 return new LinuxArmSystem(this); 257} 258 259void 260LinuxArmSystem::startup() 261{ 262 if (enableContextSwitchStatsDump) { 263 dumpStatsPCEvent = addKernelFuncEvent<DumpStatsPCEvent>("__switch_to"); 264 if (!dumpStatsPCEvent) 265 panic("dumpStatsPCEvent not created!"); 266 267 std::string task_filename = "tasks.txt"; 268 taskFile = simout.create(name() + "." + task_filename); 269 270 for (int i = 0; i < _numContexts; i++) { 271 ThreadContext *tc = threadContexts[i]; 272 uint32_t pid = tc->getCpuPtr()->getPid(); 273 if (pid != Request::invldPid) { 274 mapPid(tc, pid); 275 tc->getCpuPtr()->taskId(taskMap[pid]); 276 } 277 } 278 } 279} 280 281void 282LinuxArmSystem::mapPid(ThreadContext *tc, uint32_t pid) 283{ 284 // Create a new unique identifier for this pid 285 std::map<uint32_t, uint32_t>::iterator itr = taskMap.find(pid); 286 if (itr == taskMap.end()) { 287 uint32_t map_size = taskMap.size(); 288 if (map_size > ContextSwitchTaskId::MaxNormalTaskId + 1) { 289 warn_once("Error out of identifiers for cache occupancy stats"); 290 taskMap[pid] = ContextSwitchTaskId::Unknown; 291 } else { 292 taskMap[pid] = map_size; 293 } 294 } 295} 296 297/** This function is called whenever the the kernel function 298 * "__switch_to" is called to change running tasks. 299 * 300 * r0 = task_struct of the previously running process 301 * r1 = task_info of the previously running process 302 * r2 = task_info of the next process to run 303 */ 304void 305DumpStatsPCEvent::process(ThreadContext *tc) 306{ 307 Linux::ThreadInfo ti(tc); 308 Addr task_descriptor = tc->readIntReg(2); 309 uint32_t pid = ti.curTaskPID(task_descriptor); 310 uint32_t tgid = ti.curTaskTGID(task_descriptor); 311 std::string next_task_str = ti.curTaskName(task_descriptor); 312 313 // Streamline treats pid == -1 as the kernel process. 314 // Also pid == 0 implies idle process (except during Linux boot) 315 int32_t mm = ti.curTaskMm(task_descriptor); 316 bool is_kernel = (mm == 0); 317 if (is_kernel && (pid != 0)) { 318 pid = -1; 319 tgid = -1; 320 next_task_str = "kernel"; 321 } 322 323 LinuxArmSystem* sys = dynamic_cast<LinuxArmSystem *>(tc->getSystemPtr()); 324 if (!sys) { 325 panic("System is not LinuxArmSystem while getting Linux process info!"); 326 } 327 std::map<uint32_t, uint32_t>& taskMap = sys->taskMap; 328 329 // Create a new unique identifier for this pid 330 sys->mapPid(tc, pid); 331 332 // Set cpu task id, output process info, and dump stats 333 tc->getCpuPtr()->taskId(taskMap[pid]); 334 tc->getCpuPtr()->setPid(pid); 335 336 std::ostream* taskFile = sys->taskFile; 337 338 // Task file is read by cache occupancy plotting script or 339 // Streamline conversion script. 340 ccprintf(*taskFile, 341 "tick=%lld %d cpu_id=%d next_pid=%d next_tgid=%d next_task=%s\n", 342 curTick(), taskMap[pid], tc->cpuId(), (int) pid, (int) tgid, 343 next_task_str); 344 taskFile->flush(); 345 346 // Dump and reset statistics 347 Stats::schedStatEvent(true, true, curTick(), 0); 348} 349
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