system.cc revision 5268 
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)(Clock::Frequency /
89                    p->boot_cpu_frequency));
90
91
92    /**
93     * EV5 only supports 127 ASNs so we are going to tell the kernel that the
94     * paritiuclar EV6 we have only supports 127 asns.
95     * @todo At some point we should change ev5.hh and the palcode to support
96     * 255 ASNs.
97     */
98    if (kernelSymtab->findAddress("dp264_mv", addr))
99        virtPort.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
100    else
101        panic("could not find dp264_mv\n");
102
103#ifndef NDEBUG
104    kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
105    if (!kernelPanicEvent)
106        panic("could not find kernel symbol \'panic\'");
107
108#if 0
109    kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel");
110    if (!kernelDieEvent)
111        panic("could not find kernel symbol \'die_if_kernel\'");
112#endif
113
114#endif
115
116    /**
117     * Any time ide_delay_50ms, calibarte_delay or
118     * determine_cpu_caches is called just skip the
119     * function. Currently determine_cpu_caches only is used put
120     * information in proc, however if that changes in the future we
121     * will have to fill in the cache size variables appropriately.
122     */
123
124    skipIdeDelay50msEvent =
125        addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
126    skipDelayLoopEvent =
127        addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
128    skipCacheProbeEvent =
129        addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
130    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
131    idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
132
133    // Disable for now as it runs into panic() calls in VPTr methods
134    // (see sim/vptr.hh).  Once those bugs are fixed, we can
135    // re-enable, but we should find a better way to turn it on than
136    // using DTRACE(Thread), since looking at a trace flag at tick 0
137    // leads to non-intuitive behavior with --trace-start.
138    if (false && kernelSymtab->findAddress("mips_switch_to", addr)) {
139        printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
140                                               addr + sizeof(MachInst) * 6);
141    } else {
142        printThreadEvent = NULL;
143    }
144}
145
146LinuxMipsSystem::~LinuxMipsSystem()
147{
148#ifndef NDEBUG
149    delete kernelPanicEvent;
150#endif
151    delete skipIdeDelay50msEvent;
152    delete skipDelayLoopEvent;
153    delete skipCacheProbeEvent;
154    delete debugPrintkEvent;
155    delete idleStartEvent;
156    delete printThreadEvent;
157}
158
159
160void
161LinuxMipsSystem::setDelayLoop(ThreadContext *tc)
162{
163    Addr addr = 0;
164    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
165        Tick cpuFreq = tc->getCpuPtr()->frequency();
166        Tick intrFreq = platform->intrFrequency();
167        VirtualPort *vp;
168
169        vp = tc->getVirtPort();
170        vp->writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988));
171        tc->delVirtPort(vp);
172    }
173}
174
175
176void
177LinuxMipsSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
178{
179    SkipFuncEvent::process(tc);
180    // calculate and set loops_per_jiffy
181    ((LinuxMipsSystem *)tc->getSystemPtr())->setDelayLoop(tc);
182}
183
184void
185LinuxMipsSystem::PrintThreadInfo::process(ThreadContext *tc)
186{
187    Linux::ThreadInfo ti(tc);
188
189    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
190            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
191}
192
193LinuxMipsSystem *
194LinuxMipsSystemParams::create()
195{
196    return new LinuxMipsSystem(this);
197}
198