system.hh revision 3565 
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
36class ThreadContext;
37
38class BreakPCEvent;
39class IdleStartEvent;
40
41#include "arch/alpha/idle_event.hh"
42#include "arch/alpha/system.hh"
43#include "kern/linux/events.hh"
44
45using namespace AlphaISA;
46using namespace Linux;
47
48/**
49 * This class contains linux specific system code (Loading, Events).
50 * It points to objects that are the system binaries to load and patches them
51 * appropriately to work in simulator.
52 */
53class LinuxAlphaSystem : public AlphaSystem
54{
55  private:
56    class SkipDelayLoopEvent : public SkipFuncEvent
57    {
58      public:
59        SkipDelayLoopEvent(PCEventQueue *q, const std::string &desc, Addr addr)
60            : SkipFuncEvent(q, desc, addr) {}
61        virtual void process(ThreadContext *tc);
62    };
63
64    class PrintThreadInfo : public PCEvent
65    {
66      public:
67        PrintThreadInfo(PCEventQueue *q, const std::string &desc, Addr addr)
68            : PCEvent(q, desc, addr) {}
69        virtual void process(ThreadContext *tc);
70    };
71
72
73    /**
74     * Addresses defining where the kernel bootloader places various
75     * elements.  Details found in include/asm-alpha/system.h
76     */
77    Addr KernelStart; // Lookup the symbol swapper_pg_dir
78
79  public:
80    Addr InitStack() const { return KernelStart + 0x02000; }
81    Addr EmptyPGT() const  { return KernelStart + 0x04000; }
82    Addr EmptyPGE() const  { return KernelStart + 0x08000; }
83    Addr ZeroPGE() const   { return KernelStart + 0x0A000; }
84    Addr StartAddr() const { return KernelStart + 0x10000; }
85
86    Addr Param() const { return ZeroPGE() + 0x0; }
87    Addr CommandLine() const { return Param() + 0x0; }
88    Addr InitrdStart() const { return Param() + 0x100; }
89    Addr InitrdSize() const { return Param() + 0x108; }
90    static const int CommandLineSize = 256;
91
92  private:
93#ifndef NDEBUG
94    /** Event to halt the simulator if the kernel calls panic()  */
95    BreakPCEvent *kernelPanicEvent;
96
97    /** Event to halt the simulator if the kernel calls die_if_kernel  */
98    BreakPCEvent *kernelDieEvent;
99#endif
100
101    /**
102     * Event to skip determine_cpu_caches() because we don't support
103     * the IPRs that the code can access to figure out cache sizes
104     */
105    SkipFuncEvent *skipCacheProbeEvent;
106
107    /** PC based event to skip the ide_delay_50ms() call */
108    SkipFuncEvent *skipIdeDelay50msEvent;
109
110    /**
111     * PC based event to skip the dprink() call and emulate its
112     * functionality
113     */
114    DebugPrintkEvent *debugPrintkEvent;
115
116    /**
117     * Skip calculate_delay_loop() rather than waiting for this to be
118     * calculated
119     */
120    SkipDelayLoopEvent *skipDelayLoopEvent;
121
122    /**
123     * Event to print information about thread switches if the trace flag
124     * Thread is set
125     */
126    PrintThreadInfo *printThreadEvent;
127
128    /** Grab the PCBB of the idle process when it starts */
129    IdleStartEvent *idleStartEvent;
130
131  public:
132    LinuxAlphaSystem(Params *p);
133    ~LinuxAlphaSystem();
134
135    void setDelayLoop(ThreadContext *tc);
136};
137
138#endif // __ARCH_ALPHA_LINUX_SYSTEM_HH__
139