src/arch/alpha/linux/system.cc

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