system.cc revision 4741:bf24c2d97ae1 
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 * Authors: Ali Saidi
29 *          Lisa Hsu
30 *          Nathan Binkert
31 *          Steve Reinhardt
32 */
33
34/**
35 * @file
36 * This code loads the linux kernel, console, pal and patches certain
37 * functions.  The symbol tables are loaded so that traces can show
38 * the executing function and we can skip functions. Various delay
39 * loops are skipped and their final values manually computed to speed
40 * up boot time.
41 */
42
43#include "arch/arguments.hh"
44#include "arch/vtophys.hh"
45#include "arch/alpha/idle_event.hh"
46#include "arch/alpha/linux/system.hh"
47#include "arch/alpha/linux/threadinfo.hh"
48#include "arch/alpha/system.hh"
49#include "base/loader/symtab.hh"
50#include "cpu/thread_context.hh"
51#include "cpu/base.hh"
52#include "dev/platform.hh"
53#include "kern/linux/printk.hh"
54#include "kern/linux/events.hh"
55#include "mem/physical.hh"
56#include "mem/port.hh"
57#include "sim/builder.hh"
58#include "sim/byteswap.hh"
59
60using namespace std;
61using namespace AlphaISA;
62using namespace Linux;
63
64LinuxAlphaSystem::LinuxAlphaSystem(Params *p)
65    : AlphaSystem(p)
66{
67    Addr addr = 0;
68
69    /**
70     * The symbol swapper_pg_dir marks the beginning of the kernel and
71     * the location of bootloader passed arguments
72     */
73    if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
74        panic("Could not determine start location of kernel");
75    }
76
77    /**
78     * Since we aren't using a bootloader, we have to copy the
79     * kernel arguments directly into the kernel's memory.
80     */
81    virtPort.writeBlob(CommandLine(), (uint8_t*)params()->boot_osflags.c_str(),
82                params()->boot_osflags.length()+1);
83
84    /**
85     * find the address of the est_cycle_freq variable and insert it
86     * so we don't through the lengthly process of trying to
87     * calculated it by using the PIT, RTC, etc.
88     */
89    if (kernelSymtab->findAddress("est_cycle_freq", addr))
90        virtPort.write(addr, (uint64_t)(Clock::Frequency /
91                    p->boot_cpu_frequency));
92
93
94    /**
95     * EV5 only supports 127 ASNs so we are going to tell the kernel that the
96     * paritiuclar EV6 we have only supports 127 asns.
97     * @todo At some point we should change ev5.hh and the palcode to support
98     * 255 ASNs.
99     */
100    if (kernelSymtab->findAddress("dp264_mv", addr))
101        virtPort.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
102    else
103        panic("could not find dp264_mv\n");
104
105#ifndef NDEBUG
106    kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
107    if (!kernelPanicEvent)
108        panic("could not find kernel symbol \'panic\'");
109
110#if 0
111    kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel");
112    if (!kernelDieEvent)
113        panic("could not find kernel symbol \'die_if_kernel\'");
114#endif
115
116#endif
117
118    /**
119     * Any time ide_delay_50ms, calibarte_delay or
120     * determine_cpu_caches is called just skip the
121     * function. Currently determine_cpu_caches only is used put
122     * information in proc, however if that changes in the future we
123     * will have to fill in the cache size variables appropriately.
124     */
125
126    skipIdeDelay50msEvent =
127        addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
128    skipDelayLoopEvent =
129        addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
130    skipCacheProbeEvent =
131        addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
132    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
133    idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
134
135    // Disable for now as it runs into panic() calls in VPTr methods
136    // (see sim/vptr.hh).  Once those bugs are fixed, we can
137    // re-enable, but we should find a better way to turn it on than
138    // using DTRACE(Thread), since looking at a trace flag at tick 0
139    // leads to non-intuitive behavior with --trace-start.
140    if (false && kernelSymtab->findAddress("alpha_switch_to", addr)) {
141        printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
142                                               addr + sizeof(MachInst) * 6);
143    } else {
144        printThreadEvent = NULL;
145    }
146}
147
148LinuxAlphaSystem::~LinuxAlphaSystem()
149{
150#ifndef NDEBUG
151    delete kernelPanicEvent;
152#endif
153    delete skipIdeDelay50msEvent;
154    delete skipDelayLoopEvent;
155    delete skipCacheProbeEvent;
156    delete debugPrintkEvent;
157    delete idleStartEvent;
158    delete printThreadEvent;
159}
160
161
162void
163LinuxAlphaSystem::setDelayLoop(ThreadContext *tc)
164{
165    Addr addr = 0;
166    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
167        Tick cpuFreq = tc->getCpuPtr()->frequency();
168        Tick intrFreq = platform->intrFrequency();
169        VirtualPort *vp;
170
171        vp = tc->getVirtPort();
172        vp->writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988));
173        tc->delVirtPort(vp);
174    }
175}
176
177
178void
179LinuxAlphaSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
180{
181    SkipFuncEvent::process(tc);
182    // calculate and set loops_per_jiffy
183    ((LinuxAlphaSystem *)tc->getSystemPtr())->setDelayLoop(tc);
184}
185
186void
187LinuxAlphaSystem::PrintThreadInfo::process(ThreadContext *tc)
188{
189    Linux::ThreadInfo ti(tc);
190
191    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
192            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
193}
194
195
196BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
197
198    Param<Tick> boot_cpu_frequency;
199    SimObjectParam<PhysicalMemory *> physmem;
200    SimpleEnumParam<System::MemoryMode> mem_mode;
201
202    Param<string> kernel;
203    Param<string> console;
204    Param<string> pal;
205
206    Param<string> boot_osflags;
207    Param<string> readfile;
208    Param<string> symbolfile;
209    Param<unsigned int> init_param;
210
211    Param<uint64_t> system_type;
212    Param<uint64_t> system_rev;
213
214END_DECLARE_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
215
216BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
217
218    INIT_PARAM(boot_cpu_frequency, "Frequency of the boot CPU"),
219    INIT_PARAM(physmem, "phsyical memory"),
220    INIT_ENUM_PARAM(mem_mode, "Memory Mode, (1=atomic, 2=timing)",
221            System::MemoryModeStrings),
222    INIT_PARAM(kernel, "file that contains the kernel code"),
223    INIT_PARAM(console, "file that contains the console code"),
224    INIT_PARAM(pal, "file that contains palcode"),
225    INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot",
226                    "a"),
227    INIT_PARAM_DFLT(readfile, "file to read startup script from", ""),
228    INIT_PARAM_DFLT(symbolfile, "file to read symbols from", ""),
229    INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
230    INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34),
231    INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10)
232
233END_INIT_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
234
235CREATE_SIM_OBJECT(LinuxAlphaSystem)
236{
237    AlphaSystem::Params *p = new AlphaSystem::Params;
238    p->name = getInstanceName();
239    p->boot_cpu_frequency = boot_cpu_frequency;
240    p->physmem = physmem;
241    p->mem_mode = mem_mode;
242    p->kernel_path = kernel;
243    p->console_path = console;
244    p->palcode = pal;
245    p->boot_osflags = boot_osflags;
246    p->init_param = init_param;
247    p->readfile = readfile;
248    p->symbolfile = symbolfile;
249    p->system_type = system_type;
250    p->system_rev = system_rev;
251    return new LinuxAlphaSystem(p);
252}
253
254REGISTER_SIM_OBJECT("LinuxAlphaSystem", LinuxAlphaSystem)
255
256