system.cc revision 4741:bf24c2d97ae1
1/* 2 * Copyright (c) 2004-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Ali Saidi 29 * Lisa Hsu 30 * Nathan Binkert 31 * Steve Reinhardt 32 */ 33 34/** 35 * @file 36 * This code loads the linux kernel, console, pal and patches certain 37 * functions. The symbol tables are loaded so that traces can show 38 * the executing function and we can skip functions. Various delay 39 * loops are skipped and their final values manually computed to speed 40 * up boot time. 41 */ 42 43#include "arch/arguments.hh" 44#include "arch/vtophys.hh" 45#include "arch/alpha/idle_event.hh" 46#include "arch/alpha/linux/system.hh" 47#include "arch/alpha/linux/threadinfo.hh" 48#include "arch/alpha/system.hh" 49#include "base/loader/symtab.hh" 50#include "cpu/thread_context.hh" 51#include "cpu/base.hh" 52#include "dev/platform.hh" 53#include "kern/linux/printk.hh" 54#include "kern/linux/events.hh" 55#include "mem/physical.hh" 56#include "mem/port.hh" 57#include "sim/builder.hh" 58#include "sim/byteswap.hh" 59 60using namespace std; 61using namespace AlphaISA; 62using namespace Linux; 63 64LinuxAlphaSystem::LinuxAlphaSystem(Params *p) 65 : AlphaSystem(p) 66{ 67 Addr addr = 0; 68 69 /** 70 * The symbol swapper_pg_dir marks the beginning of the kernel and 71 * the location of bootloader passed arguments 72 */ 73 if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) { 74 panic("Could not determine start location of kernel"); 75 } 76 77 /** 78 * Since we aren't using a bootloader, we have to copy the 79 * kernel arguments directly into the kernel's memory. 80 */ 81 virtPort.writeBlob(CommandLine(), (uint8_t*)params()->boot_osflags.c_str(), 82 params()->boot_osflags.length()+1); 83 84 /** 85 * find the address of the est_cycle_freq variable and insert it 86 * so we don't through the lengthly process of trying to 87 * calculated it by using the PIT, RTC, etc. 88 */ 89 if (kernelSymtab->findAddress("est_cycle_freq", addr)) 90 virtPort.write(addr, (uint64_t)(Clock::Frequency / 91 p->boot_cpu_frequency)); 92 93 94 /** 95 * EV5 only supports 127 ASNs so we are going to tell the kernel that the 96 * paritiuclar EV6 we have only supports 127 asns. 97 * @todo At some point we should change ev5.hh and the palcode to support 98 * 255 ASNs. 99 */ 100 if (kernelSymtab->findAddress("dp264_mv", addr)) 101 virtPort.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127)); 102 else 103 panic("could not find dp264_mv\n"); 104 105#ifndef NDEBUG 106 kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic"); 107 if (!kernelPanicEvent) 108 panic("could not find kernel symbol \'panic\'"); 109 110#if 0 111 kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel"); 112 if (!kernelDieEvent) 113 panic("could not find kernel symbol \'die_if_kernel\'"); 114#endif 115 116#endif 117 118 /** 119 * Any time ide_delay_50ms, calibarte_delay or 120 * determine_cpu_caches is called just skip the 121 * function. Currently determine_cpu_caches only is used put 122 * information in proc, however if that changes in the future we 123 * will have to fill in the cache size variables appropriately. 124 */ 125 126 skipIdeDelay50msEvent = 127 addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms"); 128 skipDelayLoopEvent = 129 addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay"); 130 skipCacheProbeEvent = 131 addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches"); 132 debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk"); 133 idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle"); 134 135 // Disable for now as it runs into panic() calls in VPTr methods 136 // (see sim/vptr.hh). Once those bugs are fixed, we can 137 // re-enable, but we should find a better way to turn it on than 138 // using DTRACE(Thread), since looking at a trace flag at tick 0 139 // leads to non-intuitive behavior with --trace-start. 140 if (false && kernelSymtab->findAddress("alpha_switch_to", addr)) { 141 printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo", 142 addr + sizeof(MachInst) * 6); 143 } else { 144 printThreadEvent = NULL; 145 } 146} 147 148LinuxAlphaSystem::~LinuxAlphaSystem() 149{ 150#ifndef NDEBUG 151 delete kernelPanicEvent; 152#endif 153 delete skipIdeDelay50msEvent; 154 delete skipDelayLoopEvent; 155 delete skipCacheProbeEvent; 156 delete debugPrintkEvent; 157 delete idleStartEvent; 158 delete printThreadEvent; 159} 160 161 162void 163LinuxAlphaSystem::setDelayLoop(ThreadContext *tc) 164{ 165 Addr addr = 0; 166 if (kernelSymtab->findAddress("loops_per_jiffy", addr)) { 167 Tick cpuFreq = tc->getCpuPtr()->frequency(); 168 Tick intrFreq = platform->intrFrequency(); 169 VirtualPort *vp; 170 171 vp = tc->getVirtPort(); 172 vp->writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988)); 173 tc->delVirtPort(vp); 174 } 175} 176 177 178void 179LinuxAlphaSystem::SkipDelayLoopEvent::process(ThreadContext *tc) 180{ 181 SkipFuncEvent::process(tc); 182 // calculate and set loops_per_jiffy 183 ((LinuxAlphaSystem *)tc->getSystemPtr())->setDelayLoop(tc); 184} 185 186void 187LinuxAlphaSystem::PrintThreadInfo::process(ThreadContext *tc) 188{ 189 Linux::ThreadInfo ti(tc); 190 191 DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n", 192 ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart()); 193} 194 195 196BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxAlphaSystem) 197 198 Param<Tick> boot_cpu_frequency; 199 SimObjectParam<PhysicalMemory *> physmem; 200 SimpleEnumParam<System::MemoryMode> mem_mode; 201 202 Param<string> kernel; 203 Param<string> console; 204 Param<string> pal; 205 206 Param<string> boot_osflags; 207 Param<string> readfile; 208 Param<string> symbolfile; 209 Param<unsigned int> init_param; 210 211 Param<uint64_t> system_type; 212 Param<uint64_t> system_rev; 213 214END_DECLARE_SIM_OBJECT_PARAMS(LinuxAlphaSystem) 215 216BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxAlphaSystem) 217 218 INIT_PARAM(boot_cpu_frequency, "Frequency of the boot CPU"), 219 INIT_PARAM(physmem, "phsyical memory"), 220 INIT_ENUM_PARAM(mem_mode, "Memory Mode, (1=atomic, 2=timing)", 221 System::MemoryModeStrings), 222 INIT_PARAM(kernel, "file that contains the kernel code"), 223 INIT_PARAM(console, "file that contains the console code"), 224 INIT_PARAM(pal, "file that contains palcode"), 225 INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot", 226 "a"), 227 INIT_PARAM_DFLT(readfile, "file to read startup script from", ""), 228 INIT_PARAM_DFLT(symbolfile, "file to read symbols from", ""), 229 INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0), 230 INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34), 231 INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10) 232 233END_INIT_SIM_OBJECT_PARAMS(LinuxAlphaSystem) 234 235CREATE_SIM_OBJECT(LinuxAlphaSystem) 236{ 237 AlphaSystem::Params *p = new AlphaSystem::Params; 238 p->name = getInstanceName(); 239 p->boot_cpu_frequency = boot_cpu_frequency; 240 p->physmem = physmem; 241 p->mem_mode = mem_mode; 242 p->kernel_path = kernel; 243 p->console_path = console; 244 p->palcode = pal; 245 p->boot_osflags = boot_osflags; 246 p->init_param = init_param; 247 p->readfile = readfile; 248 p->symbolfile = symbolfile; 249 p->system_type = system_type; 250 p->system_rev = system_rev; 251 return new LinuxAlphaSystem(p); 252} 253 254REGISTER_SIM_OBJECT("LinuxAlphaSystem", LinuxAlphaSystem) 255 256