system.hh revision 2343 
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
29#ifndef __ARCH_ALPHA_LINUX_SYSTEM_HH__
30#define __ARCH_ALPHA_LINUX_SYSTEM_HH__
31
32class ExecContext;
33
34class BreakPCEvent;
35class IdleStartEvent;
36
37#include "arch/alpha/system.hh"
38#include "kern/linux/events.hh"
39
40using namespace AlphaISA;
41using namespace Linux;
42using namespace std;
43
44/**
45 * This class contains linux specific system code (Loading, Events).
46 * It points to objects that are the system binaries to load and patches them
47 * appropriately to work in simulator.
48 */
49class LinuxAlphaSystem : public AlphaSystem
50{
51  private:
52    class SkipDelayLoopEvent : public SkipFuncEvent
53    {
54      public:
55        SkipDelayLoopEvent(PCEventQueue *q, const std::string &desc, Addr addr)
56            : SkipFuncEvent(q, desc, addr) {}
57        virtual void process(ExecContext *xc);
58    };
59
60    class PrintThreadInfo : public PCEvent
61    {
62      public:
63        PrintThreadInfo(PCEventQueue *q, const std::string &desc, Addr addr)
64            : PCEvent(q, desc, addr) {}
65        virtual void process(ExecContext *xc);
66    };
67
68
69    /**
70     * Addresses defining where the kernel bootloader places various
71     * elements.  Details found in include/asm-alpha/system.h
72     */
73    Addr KernelStart; // Lookup the symbol swapper_pg_dir
74
75  public:
76    Addr InitStack() const { return KernelStart + 0x02000; }
77    Addr EmptyPGT() const  { return KernelStart + 0x04000; }
78    Addr EmptyPGE() const  { return KernelStart + 0x08000; }
79    Addr ZeroPGE() const   { return KernelStart + 0x0A000; }
80    Addr StartAddr() const { return KernelStart + 0x10000; }
81
82    Addr Param() const { return ZeroPGE() + 0x0; }
83    Addr CommandLine() const { return Param() + 0x0; }
84    Addr InitrdStart() const { return Param() + 0x100; }
85    Addr InitrdSize() const { return Param() + 0x108; }
86    static const int CommandLineSize = 256;
87
88  private:
89#ifndef NDEBUG
90    /** Event to halt the simulator if the kernel calls panic()  */
91    BreakPCEvent *kernelPanicEvent;
92
93    /** Event to halt the simulator if the kernel calls die_if_kernel  */
94    BreakPCEvent *kernelDieEvent;
95#endif
96
97    /**
98     * Event to skip determine_cpu_caches() because we don't support
99     * the IPRs that the code can access to figure out cache sizes
100     */
101    SkipFuncEvent *skipCacheProbeEvent;
102
103    /** PC based event to skip the ide_delay_50ms() call */
104    SkipFuncEvent *skipIdeDelay50msEvent;
105
106    /**
107     * PC based event to skip the dprink() call and emulate its
108     * functionality
109     */
110    DebugPrintkEvent *debugPrintkEvent;
111
112    /**
113     * Skip calculate_delay_loop() rather than waiting for this to be
114     * calculated
115     */
116    SkipDelayLoopEvent *skipDelayLoopEvent;
117
118    /**
119     * Event to print information about thread switches if the trace flag
120     * Thread is set
121     */
122    PrintThreadInfo *printThreadEvent;
123
124    /** Grab the PCBB of the idle process when it starts */
125    IdleStartEvent *idleStartEvent;
126
127  public:
128    LinuxAlphaSystem(Params *p);
129    ~LinuxAlphaSystem();
130
131    void setDelayLoop(ExecContext *xc);
132};
133
134#endif // __ARCH_ALPHA_LINUX_SYSTEM_HH__
135