kern/linux/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
  29 /**
  30  * @file
  31  * This code loads the linux kernel, console, pal and patches certain
  32  * functions.  The symbol tables are loaded so that traces can show
  33  * the executing function and we can skip functions. Various delay
  34  * loops are skipped and their final values manually computed to speed
  35  * up boot time.
  36  */
  37
  38 #include "base/loader/symtab.hh"
  39 #include "cpu/exec_context.hh"
  40 #include "cpu/base.hh"
  41 #include "kern/linux/linux_system.hh"
  42 #include "kern/linux/linux_threadinfo.hh"
  43 #include "kern/linux/printk.hh"
  44 #include "mem/functional/memory_control.hh"
  45 #include "mem/functional/physical.hh"
  46 #include "sim/builder.hh"
  47 #include "dev/platform.hh"
  48 #include "targetarch/arguments.hh"
  49 #include "targetarch/vtophys.hh"
  50
  51 using namespace std;
  52
  53 LinuxSystem::LinuxSystem(Params *p)
  54     : System(p)
  55 {
  56     Addr addr = 0;
  57     Addr paddr = 0;
  58
  59     /**
  60      * The symbol swapper_pg_dir marks the beginning of the kernel and
  61      * the location of bootloader passed arguments
  62      */
  63     if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
  64         panic("Could not determine start location of kernel");
  65     }
  66
  67     /**
  68      * Since we aren't using a bootloader, we have to copy the
  69      * kernel arguments directly into the kernel's memory.
  70      */
  71     paddr = vtophys(physmem, CommandLine());
  72     char *commandline = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
  73     if (commandline)
  74         strncpy(commandline, params->boot_osflags.c_str(), CommandLineSize);
  75
  76     /**
  77      * find the address of the est_cycle_freq variable and insert it
  78      * so we don't through the lengthly process of trying to
  79      * calculated it by using the PIT, RTC, etc.
  80      */
  81     if (kernelSymtab->findAddress("est_cycle_freq", addr)) {
  82         paddr = vtophys(physmem, addr);
  83         uint8_t *est_cycle_frequency =
  84             physmem->dma_addr(paddr, sizeof(uint64_t));
  85
  86         if (est_cycle_frequency)
  87             *(uint64_t *)est_cycle_frequency =
  88                 Clock::Frequency / p->boot_cpu_frequency;
  89     }
  90
  91
  92     /**
  93      * EV5 only supports 127 ASNs so we are going to tell the kernel that the
  94      * paritiuclar EV6 we have only supports 127 asns.
  95      * @todo At some point we should change ev5.hh and the palcode to support
  96      * 255 ASNs.
  97      */
  98     if (kernelSymtab->findAddress("dp264_mv", addr)) {
  99         paddr = vtophys(physmem, addr);
 100         char *dp264_mv = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
 101
 102         if (dp264_mv) {
 103             *(uint32_t*)(dp264_mv+0x18) = htog((uint32_t)127);
 104         } else
 105             panic("could not translate dp264_mv addr\n");
 106
 107     } else
 108         panic("could not find dp264_mv\n");
 109
 110 #ifndef NDEBUG
 111     kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
 112     if (!kernelPanicEvent)
 113         panic("could not find kernel symbol \'panic\'");
 114
 115 #if 0
 116     kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel");
 117     if (!kernelDieEvent)
 118         panic("could not find kernel symbol \'die_if_kernel\'");
 119 #endif
 120
 121 #endif
 122
 123     /**
 124      * Any time ide_delay_50ms, calibarte_delay or
 125      * determine_cpu_caches is called just skip the
 126      * function. Currently determine_cpu_caches only is used put
 127      * information in proc, however if that changes in the future we
 128      * will have to fill in the cache size variables appropriately.
 129      */
 130
 131     skipIdeDelay50msEvent =
 132         addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
 133     skipDelayLoopEvent =
 134         addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
 135     skipCacheProbeEvent =
 136         addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
 137     debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
 138     idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
 139
 140     if (kernelSymtab->findAddress("alpha_switch_to", addr) && DTRACE(Thread)) {
 141         printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
 142                                                addr + sizeof(MachInst) * 6);
 143     } else {
 144         printThreadEvent = NULL;
 145     }
 146
 147     if (params->bin_int) {
 148         intStartEvent = addPalFuncEvent<InterruptStartEvent>("sys_int_21");
 149         if (!intStartEvent)
 150             panic("could not find symbol: sys_int_21\n");
 151
 152         intEndEvent = addPalFuncEvent<InterruptEndEvent>("rti_to_kern");
 153         if (!intEndEvent)
 154             panic("could not find symbol: rti_to_kern\n");
 155
 156         intEndEvent2 = addPalFuncEvent<InterruptEndEvent>("rti_to_user");
 157         if (!intEndEvent2)
 158             panic("could not find symbol: rti_to_user\n");
 159
 160         intEndEvent3 = addKernelFuncEvent<InterruptEndEvent>("do_softirq");
 161         if (!intEndEvent3)
 162             panic("could not find symbol: do_softirq\n");
 163     }
 164 }
 165
 166 LinuxSystem::~LinuxSystem()
 167 {
 168 #ifndef NDEBUG
 169     delete kernelPanicEvent;
 170 #endif
 171     delete skipIdeDelay50msEvent;
 172     delete skipDelayLoopEvent;
 173     delete skipCacheProbeEvent;
 174     delete debugPrintkEvent;
 175     delete idleStartEvent;
 176     delete printThreadEvent;
 177     delete intStartEvent;
 178     delete intEndEvent;
 179     delete intEndEvent2;
 180 }
 181
 182
 183 void
 184 LinuxSystem::setDelayLoop(ExecContext *xc)
 185 {
 186     Addr addr = 0;
 187     if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
 188         Addr paddr = vtophys(physmem, addr);
 189
 190         uint8_t *loops_per_jiffy =
 191             physmem->dma_addr(paddr, sizeof(uint32_t));
 192
 193         Tick cpuFreq = xc->cpu->frequency();
 194         Tick intrFreq = platform->intrFrequency();
 195         *(uint32_t *)loops_per_jiffy =
 196             (uint32_t)((cpuFreq / intrFreq) * 0.9988);
 197     }
 198 }
 199
 200 void
 201 LinuxSystem::SkipDelayLoopEvent::process(ExecContext *xc)
 202 {
 203     SkipFuncEvent::process(xc);
 204     // calculate and set loops_per_jiffy
 205     ((LinuxSystem *)xc->system)->setDelayLoop(xc);
 206 }
 207
 208 void
 209 LinuxSystem::DebugPrintkEvent::process(ExecContext *xc)
 210 {
 211     if (DTRACE(DebugPrintf)) {
 212         if (!raw) {
 213             StringWrap name(xc->system->name() + ".dprintk");
 214             DPRINTFN("");
 215         }
 216
 217         AlphaArguments args(xc);
 218         Printk(args);
 219         SkipFuncEvent::process(xc);
 220     }
 221 }
 222
 223 void
 224 LinuxSystem::PrintThreadInfo::process(ExecContext *xc)
 225 {
 226     Linux::ThreadInfo ti(xc);
 227
 228     DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
 229             ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
 230 }
 231
 232
 233 BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
 234
 235     Param<Tick> boot_cpu_frequency;
 236     SimObjectParam<MemoryController *> memctrl;
 237     SimObjectParam<PhysicalMemory *> physmem;
 238
 239     Param<string> kernel;
 240     Param<string> console;
 241     Param<string> pal;
 242
 243     Param<string> boot_osflags;
 244     Param<string> readfile;
 245     Param<unsigned int> init_param;
 246
 247     Param<uint64_t> system_type;
 248     Param<uint64_t> system_rev;
 249
 250     Param<bool> bin;
 251     VectorParam<string> binned_fns;
 252     Param<bool> bin_int;
 253
 254 END_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
 255
 256 BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
 257
 258     INIT_PARAM(boot_cpu_frequency, "Frequency of the boot CPU"),
 259     INIT_PARAM(memctrl, "memory controller"),
 260     INIT_PARAM(physmem, "phsyical memory"),
 261     INIT_PARAM(kernel, "file that contains the kernel code"),
 262     INIT_PARAM(console, "file that contains the console code"),
 263     INIT_PARAM(pal, "file that contains palcode"),
 264     INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot",
 265                     "a"),
 266     INIT_PARAM_DFLT(readfile, "file to read startup script from", ""),
 267     INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
 268     INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34),
 269     INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10),
 270     INIT_PARAM_DFLT(bin, "is this system to be binned", false),
 271     INIT_PARAM(binned_fns, "functions to be broken down and binned"),
 272     INIT_PARAM_DFLT(bin_int, "is interrupt code binned seperately?", true)
 273
 274 END_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
 275
 276 CREATE_SIM_OBJECT(LinuxSystem)
 277 {
 278     System::Params *p = new System::Params;
 279     p->name = getInstanceName();
 280     p->boot_cpu_frequency = boot_cpu_frequency;
 281     p->memctrl = memctrl;
 282     p->physmem = physmem;
 283     p->kernel_path = kernel;
 284     p->console_path = console;
 285     p->palcode = pal;
 286     p->boot_osflags = boot_osflags;
 287     p->init_param = init_param;
 288     p->readfile = readfile;
 289     p->system_type = system_type;
 290     p->system_rev = system_rev;
 291     p->bin = bin;
 292     p->binned_fns = binned_fns;
 293     p->bin_int = bin_int;
 294     return new LinuxSystem(p);
 295 }
 296
 297 REGISTER_SIM_OBJECT("LinuxSystem", LinuxSystem)
 298