src/arch/alpha/linux/system.hh

   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 #ifndef __ARCH_ALPHA_LINUX_SYSTEM_HH__
  34 #define __ARCH_ALPHA_LINUX_SYSTEM_HH__
  35
  36 class ThreadContext;
  37
  38 class BreakPCEvent;
  39 class IdleStartEvent;
  40
  41 #include "arch/alpha/idle_event.hh"
  42 #include "arch/alpha/system.hh"
  43 #include "kern/linux/events.hh"
  44 #include "params/LinuxAlphaSystem.hh"
  45
  46 /**
  47  * This class contains linux specific system code (Loading, Events).
  48  * It points to objects that are the system binaries to load and patches them
  49  * appropriately to work in simulator.
  50  */
  51 class LinuxAlphaSystem : public AlphaSystem
  52 {
  53   private:
  54     struct SkipDelayLoopEvent : public SkipFuncEvent
  55     {
  56         SkipDelayLoopEvent(PCEventScope *s, const std::string &desc, Addr addr)
  57             : SkipFuncEvent(s, desc, addr) {}
  58         virtual void process(ThreadContext *tc);
  59     };
  60
  61     struct PrintThreadInfo : public PCEvent
  62     {
  63         PrintThreadInfo(PCEventScope *s, const std::string &desc, Addr addr)
  64             : PCEvent(s, desc, addr) {}
  65         virtual void process(ThreadContext *tc);
  66     };
  67
  68     /**
  69      * Addresses defining where the kernel bootloader places various
  70      * elements.  Details found in include/asm-alpha/system.h
  71      */
  72     Addr KernelStart; // Lookup the symbol swapper_pg_dir
  73
  74   public:
  75     Addr InitStack() const { return KernelStart + 0x02000; }
  76     Addr EmptyPGT() const  { return KernelStart + 0x04000; }
  77     Addr EmptyPGE() const  { return KernelStart + 0x08000; }
  78     Addr ZeroPGE() const   { return KernelStart + 0x0A000; }
  79     Addr StartAddr() const { return KernelStart + 0x10000; }
  80
  81     Addr Param() const { return ZeroPGE() + 0x0; }
  82     Addr CommandLine() const { return Param() + 0x0; }
  83     Addr InitrdStart() const { return Param() + 0x100; }
  84     Addr InitrdSize() const { return Param() + 0x108; }
  85     static const int CommandLineSize = 256;
  86
  87   private:
  88 #ifndef NDEBUG
  89     /** Event to halt the simulator if the kernel calls panic()  */
  90     BreakPCEvent *kernelPanicEvent;
  91
  92 #endif
  93
  94     /**
  95      * Event to skip determine_cpu_caches() because we don't support
  96      * the IPRs that the code can access to figure out cache sizes
  97      */
  98     SkipFuncEvent *skipCacheProbeEvent;
  99
 100     /** PC based event to skip the ide_delay_50ms() call */
 101     SkipFuncEvent *skipIdeDelay50msEvent;
 102
 103     /**
 104      * PC based event to skip the dprink() call and emulate its
 105      * functionality
 106      */
 107     Linux::DebugPrintkEvent *debugPrintkEvent;
 108
 109     /**
 110      * Skip calculate_delay_loop() rather than waiting for this to be
 111      * calculated
 112      */
 113     SkipDelayLoopEvent *skipDelayLoopEvent;
 114
 115     /**
 116      * Event to print information about thread switches if the trace flag
 117      * Thread is set
 118      */
 119     PrintThreadInfo *printThreadEvent;
 120
 121     /** Grab the PCBB of the idle process when it starts */
 122     IdleStartEvent *idleStartEvent;
 123
 124   protected:
 125     /** Setup all the function events. Must be done after init() for Alpha since
 126      * fixFuncEvent() requires a function port
 127      */
 128     virtual void setupFuncEvents();
 129
 130   public:
 131     typedef LinuxAlphaSystemParams Params;
 132     LinuxAlphaSystem(Params *p);
 133     ~LinuxAlphaSystem();
 134
 135     /**
 136      * Initialise the system
 137      */
 138     virtual void initState();
 139
 140     void setDelayLoop(ThreadContext *tc);
 141
 142     const Params *params() const { return (const Params *)_params; }
 143 };
 144
 145 #endif // __ARCH_ALPHA_LINUX_SYSTEM_HH__