system.cc revision 7064 
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/**
34 * @file
35 * This code loads the linux kernel, console, pal and patches certain
36 * functions.  The symbol tables are loaded so that traces can show
37 * the executing function and we can skip functions. Various delay
38 * loops are skipped and their final values manually computed to speed
39 * up boot time.
40 */
41
42#include "arch/vtophys.hh"
43#include "arch/mips/idle_event.hh"
44#include "arch/mips/linux/system.hh"
45#include "arch/mips/linux/threadinfo.hh"
46#include "arch/mips/system.hh"
47#include "base/loader/symtab.hh"
48#include "cpu/thread_context.hh"
49#include "cpu/base.hh"
50#include "dev/platform.hh"
51#include "kern/linux/printk.hh"
52#include "kern/linux/events.hh"
53#include "mem/physical.hh"
54#include "mem/port.hh"
55#include "sim/arguments.hh"
56#include "sim/byteswap.hh"
57
58using namespace std;
59using namespace MipsISA;
60using namespace Linux;
61
62LinuxMipsSystem::LinuxMipsSystem(Params *p)
63    : MipsSystem(p)
64{
65    Addr addr = 0;
66
67    /**
68     * The symbol swapper_pg_dir marks the beginning of the kernel and
69     * the location of bootloader passed arguments
70     */
71    if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
72        panic("Could not determine start location of kernel");
73    }
74
75    /**
76     * Since we aren't using a bootloader, we have to copy the
77     * kernel arguments directly into the kernel's memory.
78     */
79    virtPort.writeBlob(CommandLine(), (uint8_t*)params()->boot_osflags.c_str(),
80                params()->boot_osflags.length()+1);
81
82    /**
83     * find the address of the est_cycle_freq variable and insert it
84     * so we don't through the lengthly process of trying to
85     * calculated it by using the PIT, RTC, etc.
86     */
87    if (kernelSymtab->findAddress("est_cycle_freq", addr))
88        virtPort.write(addr, (uint64_t)(SimClock::Frequency /
89                    p->boot_cpu_frequency));
90
91    /**
92     * EV5 only supports 127 ASNs so we are going to tell the kernel that the
93     * paritiuclar EV6 we have only supports 127 asns.
94     * @todo At some point we should change ev5.hh and the palcode to support
95     * 255 ASNs.
96     */
97    if (kernelSymtab->findAddress("dp264_mv", addr))
98        virtPort.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
99    else
100        panic("could not find dp264_mv\n");
101
102#ifndef NDEBUG
103    kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
104    if (!kernelPanicEvent)
105        panic("could not find kernel symbol \'panic\'");
106
107#endif
108
109    /**
110     * Any time ide_delay_50ms, calibarte_delay or
111     * determine_cpu_caches is called just skip the
112     * function. Currently determine_cpu_caches only is used put
113     * information in proc, however if that changes in the future we
114     * will have to fill in the cache size variables appropriately.
115     */
116
117    skipIdeDelay50msEvent =
118        addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
119    skipDelayLoopEvent =
120        addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
121    skipCacheProbeEvent =
122        addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
123    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
124    idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
125
126    // Disable for now as it runs into panic() calls in VPTr methods
127    // (see sim/vptr.hh).  Once those bugs are fixed, we can
128    // re-enable, but we should find a better way to turn it on than
129    // using DTRACE(Thread), since looking at a trace flag at tick 0
130    // leads to non-intuitive behavior with --trace-start.
131    if (false && kernelSymtab->findAddress("mips_switch_to", addr)) {
132        printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
133                                               addr + sizeof(MachInst) * 6);
134    } else {
135        printThreadEvent = NULL;
136    }
137}
138
139LinuxMipsSystem::~LinuxMipsSystem()
140{
141#ifndef NDEBUG
142    delete kernelPanicEvent;
143#endif
144    delete skipIdeDelay50msEvent;
145    delete skipDelayLoopEvent;
146    delete skipCacheProbeEvent;
147    delete debugPrintkEvent;
148    delete idleStartEvent;
149    delete printThreadEvent;
150}
151
152
153void
154LinuxMipsSystem::setDelayLoop(ThreadContext *tc)
155{
156    Addr addr = 0;
157    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
158        Tick cpuFreq = tc->getCpuPtr()->frequency();
159        Tick intrFreq = platform->intrFrequency();
160        VirtualPort *vp;
161
162        vp = tc->getVirtPort();
163        vp->writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988));
164    }
165}
166
167
168void
169LinuxMipsSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
170{
171    SkipFuncEvent::process(tc);
172    // calculate and set loops_per_jiffy
173    ((LinuxMipsSystem *)tc->getSystemPtr())->setDelayLoop(tc);
174}
175
176void
177LinuxMipsSystem::PrintThreadInfo::process(ThreadContext *tc)
178{
179    Linux::ThreadInfo ti(tc);
180
181    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
182            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
183}
184
185LinuxMipsSystem *
186LinuxMipsSystemParams::create()
187{
188    return new LinuxMipsSystem(this);
189}
190