system.cc revision 11793:ef606668d247
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/alpha/linux/system.hh" 44 45#include "arch/alpha/idle_event.hh" 46#include "arch/alpha/system.hh" 47#include "arch/generic/linux/threadinfo.hh" 48#include "arch/vtophys.hh" 49#include "base/loader/symtab.hh" 50#include "cpu/base.hh" 51#include "cpu/thread_context.hh" 52#include "debug/Thread.hh" 53#include "kern/linux/events.hh" 54#include "kern/linux/printk.hh" 55#include "mem/physical.hh" 56#include "mem/port.hh" 57#include "sim/arguments.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} 68 69void 70LinuxAlphaSystem::initState() 71{ 72 // Moved from the constructor to here since it relies on the 73 // address map being resolved in the interconnect 74 75 // Call the initialisation of the super class 76 AlphaSystem::initState(); 77 78 Addr addr = 0; 79 80 /** 81 * The symbol swapper_pg_dir marks the beginning of the kernel and 82 * the location of bootloader passed arguments 83 */ 84 if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) { 85 panic("Could not determine start location of kernel"); 86 } 87 88 /** 89 * Since we aren't using a bootloader, we have to copy the 90 * kernel arguments directly into the kernel's memory. 91 */ 92 virtProxy.writeBlob(CommandLine(), 93 (uint8_t*)params()->boot_osflags.c_str(), 94 params()->boot_osflags.length()+1); 95 96 /** 97 * find the address of the est_cycle_freq variable and insert it 98 * so we don't through the lengthly process of trying to 99 * calculated it by using the PIT, RTC, etc. 100 */ 101 if (kernelSymtab->findAddress("est_cycle_freq", addr)) 102 virtProxy.write(addr, (uint64_t)(SimClock::Frequency / 103 params()->boot_cpu_frequency)); 104 105 106 /** 107 * EV5 only supports 127 ASNs so we are going to tell the kernel that the 108 * paritiuclar EV6 we have only supports 127 asns. 109 * @todo At some point we should change ev5.hh and the palcode to support 110 * 255 ASNs. 111 */ 112 if (kernelSymtab->findAddress("dp264_mv", addr)) 113 virtProxy.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127)); 114 else 115 panic("could not find dp264_mv\n"); 116 117} 118 119void 120LinuxAlphaSystem::setupFuncEvents() 121{ 122 AlphaSystem::setupFuncEvents(); 123#ifndef NDEBUG 124 kernelPanicEvent = addKernelFuncEventOrPanic<BreakPCEvent>("panic"); 125 126#if 0 127 kernelDieEvent = addKernelFuncEventOrPanic<BreakPCEvent>("die_if_kernel"); 128#endif 129 130#endif 131 132 /** 133 * Any time ide_delay_50ms, calibarte_delay or 134 * determine_cpu_caches is called just skip the 135 * function. Currently determine_cpu_caches only is used put 136 * information in proc, however if that changes in the future we 137 * will have to fill in the cache size variables appropriately. 138 */ 139 140 skipIdeDelay50msEvent = 141 addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms"); 142 skipDelayLoopEvent = 143 addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay"); 144 skipCacheProbeEvent = 145 addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches"); 146 debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk"); 147 idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle"); 148 149 // Disable for now as it runs into panic() calls in VPTr methods 150 // (see sim/vptr.hh). Once those bugs are fixed, we can 151 // re-enable, but we should find a better way to turn it on than 152 // using DTRACE(Thread), since looking at a trace flag at tick 0 153 // leads to non-intuitive behavior with --trace-start. 154 Addr addr = 0; 155 if (false && kernelSymtab->findAddress("alpha_switch_to", addr)) { 156 printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo", 157 addr + sizeof(MachInst) * 6); 158 } else { 159 printThreadEvent = NULL; 160 } 161} 162 163LinuxAlphaSystem::~LinuxAlphaSystem() 164{ 165#ifndef NDEBUG 166 delete kernelPanicEvent; 167#endif 168 delete skipIdeDelay50msEvent; 169 delete skipDelayLoopEvent; 170 delete skipCacheProbeEvent; 171 delete debugPrintkEvent; 172 delete idleStartEvent; 173 delete printThreadEvent; 174} 175 176void 177LinuxAlphaSystem::setDelayLoop(ThreadContext *tc) 178{ 179 Addr addr = 0; 180 if (kernelSymtab->findAddress("loops_per_jiffy", addr)) { 181 Tick cpuFreq = tc->getCpuPtr()->frequency(); 182 assert(intrFreq); 183 FSTranslatingPortProxy &vp = tc->getVirtProxy(); 184 vp.writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988)); 185 } 186} 187 188void 189LinuxAlphaSystem::SkipDelayLoopEvent::process(ThreadContext *tc) 190{ 191 SkipFuncEvent::process(tc); 192 // calculate and set loops_per_jiffy 193 ((LinuxAlphaSystem *)tc->getSystemPtr())->setDelayLoop(tc); 194} 195 196void 197LinuxAlphaSystem::PrintThreadInfo::process(ThreadContext *tc) 198{ 199 Linux::ThreadInfo ti(tc); 200 201 DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n", 202 ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart()); 203} 204 205LinuxAlphaSystem * 206LinuxAlphaSystemParams::create() 207{ 208 return new LinuxAlphaSystem(this); 209} 210