system.cc revision 8852:c744483edfcf
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 "kern/linux/events.hh" 53#include "kern/linux/printk.hh" 54#include "mem/physical.hh" 55#include "mem/port.hh" 56#include "sim/arguments.hh" 57#include "sim/byteswap.hh" 58 59using namespace std; 60using namespace AlphaISA; 61using namespace Linux; 62 63LinuxAlphaSystem::LinuxAlphaSystem(Params *p) 64 : AlphaSystem(p) 65{ 66} 67 68void 69LinuxAlphaSystem::initState() 70{ 71 // Moved from the constructor to here since it relies on the 72 // address map being resolved in the interconnect 73 74 // Call the initialisation of the super class 75 AlphaSystem::initState(); 76 77 Addr addr = 0; 78 79 /** 80 * The symbol swapper_pg_dir marks the beginning of the kernel and 81 * the location of bootloader passed arguments 82 */ 83 if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) { 84 panic("Could not determine start location of kernel"); 85 } 86 87 /** 88 * Since we aren't using a bootloader, we have to copy the 89 * kernel arguments directly into the kernel's memory. 90 */ 91 virtProxy.writeBlob(CommandLine(), 92 (uint8_t*)params()->boot_osflags.c_str(), 93 params()->boot_osflags.length()+1); 94 95 /** 96 * find the address of the est_cycle_freq variable and insert it 97 * so we don't through the lengthly process of trying to 98 * calculated it by using the PIT, RTC, etc. 99 */ 100 if (kernelSymtab->findAddress("est_cycle_freq", addr)) 101 virtProxy.write(addr, (uint64_t)(SimClock::Frequency / 102 params()->boot_cpu_frequency)); 103 104 105 /** 106 * EV5 only supports 127 ASNs so we are going to tell the kernel that the 107 * paritiuclar EV6 we have only supports 127 asns. 108 * @todo At some point we should change ev5.hh and the palcode to support 109 * 255 ASNs. 110 */ 111 if (kernelSymtab->findAddress("dp264_mv", addr)) 112 virtProxy.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127)); 113 else 114 panic("could not find dp264_mv\n"); 115 116#ifndef NDEBUG 117 kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic"); 118 if (!kernelPanicEvent) 119 panic("could not find kernel symbol \'panic\'"); 120 121#if 0 122 kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel"); 123 if (!kernelDieEvent) 124 panic("could not find kernel symbol \'die_if_kernel\'"); 125#endif 126 127#endif 128 129 /** 130 * Any time ide_delay_50ms, calibarte_delay or 131 * determine_cpu_caches is called just skip the 132 * function. Currently determine_cpu_caches only is used put 133 * information in proc, however if that changes in the future we 134 * will have to fill in the cache size variables appropriately. 135 */ 136 137 skipIdeDelay50msEvent = 138 addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms"); 139 skipDelayLoopEvent = 140 addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay"); 141 skipCacheProbeEvent = 142 addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches"); 143 debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk"); 144 idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle"); 145 146 // Disable for now as it runs into panic() calls in VPTr methods 147 // (see sim/vptr.hh). Once those bugs are fixed, we can 148 // re-enable, but we should find a better way to turn it on than 149 // using DTRACE(Thread), since looking at a trace flag at tick 0 150 // leads to non-intuitive behavior with --trace-start. 151 if (false && kernelSymtab->findAddress("alpha_switch_to", addr)) { 152 printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo", 153 addr + sizeof(MachInst) * 6); 154 } else { 155 printThreadEvent = NULL; 156 } 157} 158 159LinuxAlphaSystem::~LinuxAlphaSystem() 160{ 161#ifndef NDEBUG 162 delete kernelPanicEvent; 163#endif 164 delete skipIdeDelay50msEvent; 165 delete skipDelayLoopEvent; 166 delete skipCacheProbeEvent; 167 delete debugPrintkEvent; 168 delete idleStartEvent; 169 delete printThreadEvent; 170} 171 172void 173LinuxAlphaSystem::setDelayLoop(ThreadContext *tc) 174{ 175 Addr addr = 0; 176 if (kernelSymtab->findAddress("loops_per_jiffy", addr)) { 177 Tick cpuFreq = tc->getCpuPtr()->frequency(); 178 assert(intrFreq); 179 FSTranslatingPortProxy &vp = tc->getVirtProxy(); 180 vp.writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988)); 181 } 182} 183 184void 185LinuxAlphaSystem::SkipDelayLoopEvent::process(ThreadContext *tc) 186{ 187 SkipFuncEvent::process(tc); 188 // calculate and set loops_per_jiffy 189 ((LinuxAlphaSystem *)tc->getSystemPtr())->setDelayLoop(tc); 190} 191 192void 193LinuxAlphaSystem::PrintThreadInfo::process(ThreadContext *tc) 194{ 195 Linux::ThreadInfo ti(tc); 196 197 DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n", 198 ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart()); 199} 200 201LinuxAlphaSystem * 202LinuxAlphaSystemParams::create() 203{ 204 return new LinuxAlphaSystem(this); 205} 206