src/arch/mips/linux/system.hh

   1 /*
   2  * Copyright (c) 2007 MIPS Technologies, Inc.
   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 #ifndef __ARCH_MIPS_LINUX_SYSTEM_HH__
  34 #define __ARCH_MIPS_LINUX_SYSTEM_HH__
  35
  36 class ThreadContext;
  37
  38 class BreakPCEvent;
  39 class IdleStartEvent;
  40
  41 #include "arch/mips/idle_event.hh"
  42 #include "arch/mips/system.hh"
  43 #include "kern/linux/events.hh"
  44 #include "params/LinuxMipsSystem.hh"
  45
  46 using namespace MipsISA;
  47 using namespace Linux;
  48
  49 /**
  50  * This class contains linux specific system code (Loading, Events).
  51  * It points to objects that are the system binaries to load and patches them
  52  * appropriately to work in simulator.
  53  */
  54 class LinuxMipsSystem : public MipsSystem
  55 {
  56   private:
  57     class SkipDelayLoopEvent : public SkipFuncEvent
  58     {
  59       public:
  60         SkipDelayLoopEvent(PCEventQueue *q, const std::string &desc, Addr addr)
  61             : SkipFuncEvent(q, desc, addr) {}
  62         virtual void process(ThreadContext *tc);
  63     };
  64
  65     class PrintThreadInfo : public PCEvent
  66     {
  67       public:
  68         PrintThreadInfo(PCEventQueue *q, const std::string &desc, Addr addr)
  69             : PCEvent(q, desc, addr) {}
  70         virtual void process(ThreadContext *tc);
  71     };
  72
  73
  74     /**
  75      * Addresses defining where the kernel bootloader places various
  76      * elements.  Details found in include/asm-mips/system.h
  77      */
  78     Addr KernelStart; // Lookup the symbol swapper_pg_dir
  79
  80   public:
  81     Addr InitStack() const { return KernelStart + 0x02000; }
  82     Addr EmptyPGT() const  { return KernelStart + 0x04000; }
  83     Addr EmptyPGE() const  { return KernelStart + 0x08000; }
  84     Addr ZeroPGE() const   { return KernelStart + 0x0A000; }
  85     Addr StartAddr() const { return KernelStart + 0x10000; }
  86
  87     Addr Param() const { return ZeroPGE() + 0x0; }
  88     Addr CommandLine() const { return Param() + 0x0; }
  89     Addr InitrdStart() const { return Param() + 0x100; }
  90     Addr InitrdSize() const { return Param() + 0x108; }
  91     static const int CommandLineSize = 256;
  92
  93   private:
  94 #ifndef NDEBUG
  95     /** Event to halt the simulator if the kernel calls panic()  */
  96     BreakPCEvent *kernelPanicEvent;
  97
  98     /** Event to halt the simulator if the kernel calls die_if_kernel  */
  99     BreakPCEvent *kernelDieEvent;
 100 #endif
 101
 102     /**
 103      * Event to skip determine_cpu_caches() because we don't support
 104      * the IPRs that the code can access to figure out cache sizes
 105      */
 106     SkipFuncEvent *skipCacheProbeEvent;
 107
 108     /** PC based event to skip the ide_delay_50ms() call */
 109     SkipFuncEvent *skipIdeDelay50msEvent;
 110
 111     /**
 112      * PC based event to skip the dprink() call and emulate its
 113      * functionality
 114      */
 115     DebugPrintkEvent *debugPrintkEvent;
 116
 117     /**
 118      * Skip calculate_delay_loop() rather than waiting for this to be
 119      * calculated
 120      */
 121     SkipDelayLoopEvent *skipDelayLoopEvent;
 122
 123     /**
 124      * Event to print information about thread switches if the trace flag
 125      * Thread is set
 126      */
 127     PrintThreadInfo *printThreadEvent;
 128
 129     /** Grab the PCBB of the idle process when it starts */
 130     IdleStartEvent *idleStartEvent;
 131
 132   public:
 133     typedef LinuxMipsSystemParams Params;
 134     LinuxMipsSystem(Params *p);
 135     ~LinuxMipsSystem();
 136
 137     void setDelayLoop(ThreadContext *tc);
 138 };
 139
 140 #endif // __ARCH_MIPS_LINUX_SYSTEM_HH__