system.cc revision 8706:b1838faf3bcc
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#include "arch/alpha/linux/threadinfo.hh" 45#include "arch/alpha/idle_event.hh" 46#include "arch/alpha/system.hh" 47#include "arch/vtophys.hh" 48#include "base/loader/symtab.hh" 49#include "cpu/base.hh" 50#include "cpu/thread_context.hh" 51#include "debug/Thread.hh" 52#include "dev/platform.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#ifndef NDEBUG 118 kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic"); 119 if (!kernelPanicEvent) 120 panic("could not find kernel symbol \'panic\'"); 121 122#if 0 123 kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel"); 124 if (!kernelDieEvent) 125 panic("could not find kernel symbol \'die_if_kernel\'"); 126#endif 127 128#endif 129 130 /** 131 * Any time ide_delay_50ms, calibarte_delay or 132 * determine_cpu_caches is called just skip the 133 * function. Currently determine_cpu_caches only is used put 134 * information in proc, however if that changes in the future we 135 * will have to fill in the cache size variables appropriately. 136 */ 137 138 skipIdeDelay50msEvent = 139 addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms"); 140 skipDelayLoopEvent = 141 addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay"); 142 skipCacheProbeEvent = 143 addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches"); 144 debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk"); 145 idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle"); 146 147 // Disable for now as it runs into panic() calls in VPTr methods 148 // (see sim/vptr.hh). Once those bugs are fixed, we can 149 // re-enable, but we should find a better way to turn it on than 150 // using DTRACE(Thread), since looking at a trace flag at tick 0 151 // leads to non-intuitive behavior with --trace-start. 152 if (false && kernelSymtab->findAddress("alpha_switch_to", addr)) { 153 printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo", 154 addr + sizeof(MachInst) * 6); 155 } else { 156 printThreadEvent = NULL; 157 } 158} 159 160LinuxAlphaSystem::~LinuxAlphaSystem() 161{ 162#ifndef NDEBUG 163 delete kernelPanicEvent; 164#endif 165 delete skipIdeDelay50msEvent; 166 delete skipDelayLoopEvent; 167 delete skipCacheProbeEvent; 168 delete debugPrintkEvent; 169 delete idleStartEvent; 170 delete printThreadEvent; 171} 172 173void 174LinuxAlphaSystem::setDelayLoop(ThreadContext *tc) 175{ 176 Addr addr = 0; 177 if (kernelSymtab->findAddress("loops_per_jiffy", addr)) { 178 Tick cpuFreq = tc->getCpuPtr()->frequency(); 179 Tick intrFreq = platform->intrFrequency(); 180 FSTranslatingPortProxy* vp; 181 182 vp = tc->getVirtProxy(); 183 vp->writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988)); 184 } 185} 186 187void 188LinuxAlphaSystem::SkipDelayLoopEvent::process(ThreadContext *tc) 189{ 190 SkipFuncEvent::process(tc); 191 // calculate and set loops_per_jiffy 192 ((LinuxAlphaSystem *)tc->getSystemPtr())->setDelayLoop(tc); 193} 194 195void 196LinuxAlphaSystem::PrintThreadInfo::process(ThreadContext *tc) 197{ 198 Linux::ThreadInfo ti(tc); 199 200 DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n", 201 ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart()); 202} 203 204LinuxAlphaSystem * 205LinuxAlphaSystemParams::create() 206{ 207 return new LinuxAlphaSystem(this); 208} 209