src/arch/mips/linux/system.cc

   1 /*
   2  * Copyright (c) 2004-2006 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  */
  32
  33 /**
  34  * @file
  35  * This code loads the linux kernel, console, pal and patches certain
  36  * functions.  The symbol tables are loaded so that traces can show
  37  * the executing function and we can skip functions. Various delay
  38  * loops are skipped and their final values manually computed to speed
  39  * up boot time.
  40  */
  41
  42 #include "arch/mips/linux/system.hh"
  43 #include "arch/mips/linux/threadinfo.hh"
  44 #include "arch/mips/idle_event.hh"
  45 #include "arch/mips/system.hh"
  46 #include "arch/vtophys.hh"
  47 #include "base/loader/symtab.hh"
  48 #include "cpu/base.hh"
  49 #include "cpu/thread_context.hh"
  50 #include "dev/platform.hh"
  51 #include "kern/linux/events.hh"
  52 #include "kern/linux/printk.hh"
  53 #include "mem/physical.hh"
  54 #include "mem/port.hh"
  55 #include "sim/arguments.hh"
  56 #include "sim/byteswap.hh"
  57
  58 using namespace std;
  59 using namespace MipsISA;
  60 using namespace Linux;
  61
  62 LinuxMipsSystem::LinuxMipsSystem(Params *p)
  63     : MipsSystem(p)
  64 {
  65     Addr addr = 0;
  66
  67     /**
  68      * The symbol swapper_pg_dir marks the beginning of the kernel and
  69      * the location of bootloader passed arguments
  70      */
  71     if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
  72         panic("Could not determine start location of kernel");
  73     }
  74
  75     /**
  76      * Since we aren't using a bootloader, we have to copy the
  77      * kernel arguments directly into the kernel's memory.
  78      */
  79     virtPort.writeBlob(CommandLine(), (uint8_t*)params()->boot_osflags.c_str(),
  80                 params()->boot_osflags.length()+1);
  81
  82     /**
  83      * find the address of the est_cycle_freq variable and insert it
  84      * so we don't through the lengthly process of trying to
  85      * calculated it by using the PIT, RTC, etc.
  86      */
  87     if (kernelSymtab->findAddress("est_cycle_freq", addr))
  88         virtPort.write(addr, (uint64_t)(SimClock::Frequency /
  89                     p->boot_cpu_frequency));
  90
  91     /**
  92      * EV5 only supports 127 ASNs so we are going to tell the kernel that the
  93      * paritiuclar EV6 we have only supports 127 asns.
  94      * @todo At some point we should change ev5.hh and the palcode to support
  95      * 255 ASNs.
  96      */
  97     if (kernelSymtab->findAddress("dp264_mv", addr))
  98         virtPort.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
  99     else
 100         panic("could not find dp264_mv\n");
 101
 102 #ifndef NDEBUG
 103     kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
 104     if (!kernelPanicEvent)
 105         panic("could not find kernel symbol \'panic\'");
 106
 107 #endif
 108
 109     /**
 110      * Any time ide_delay_50ms, calibarte_delay or
 111      * determine_cpu_caches is called just skip the
 112      * function. Currently determine_cpu_caches only is used put
 113      * information in proc, however if that changes in the future we
 114      * will have to fill in the cache size variables appropriately.
 115      */
 116
 117     skipIdeDelay50msEvent =
 118         addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
 119     skipDelayLoopEvent =
 120         addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
 121     skipCacheProbeEvent =
 122         addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
 123     debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
 124     idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
 125
 126     // Disable for now as it runs into panic() calls in VPTr methods
 127     // (see sim/vptr.hh).  Once those bugs are fixed, we can
 128     // re-enable, but we should find a better way to turn it on than
 129     // using DTRACE(Thread), since looking at a trace flag at tick 0
 130     // leads to non-intuitive behavior with --trace-start.
 131     if (false && kernelSymtab->findAddress("mips_switch_to", addr)) {
 132         printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
 133                                                addr + sizeof(MachInst) * 6);
 134     } else {
 135         printThreadEvent = NULL;
 136     }
 137 }
 138
 139 LinuxMipsSystem::~LinuxMipsSystem()
 140 {
 141 #ifndef NDEBUG
 142     delete kernelPanicEvent;
 143 #endif
 144     delete skipIdeDelay50msEvent;
 145     delete skipDelayLoopEvent;
 146     delete skipCacheProbeEvent;
 147     delete debugPrintkEvent;
 148     delete idleStartEvent;
 149     delete printThreadEvent;
 150 }
 151
 152
 153 void
 154 LinuxMipsSystem::setDelayLoop(ThreadContext *tc)
 155 {
 156     panic("setDelayLoop not implemented.\n");
 157 }
 158
 159
 160 void
 161 LinuxMipsSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
 162 {
 163     SkipFuncEvent::process(tc);
 164     // calculate and set loops_per_jiffy
 165     ((LinuxMipsSystem *)tc->getSystemPtr())->setDelayLoop(tc);
 166 }
 167
 168 void
 169 LinuxMipsSystem::PrintThreadInfo::process(ThreadContext *tc)
 170 {
 171     Linux::ThreadInfo ti(tc);
 172
 173     DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
 174             ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
 175 }
 176
 177 LinuxMipsSystem *
 178 LinuxMipsSystemParams::create()
 179 {
 180     return new LinuxMipsSystem(this);
 181 }