system.cc revision 5254 
1/*
2 * Copyright (c) 2007 MIPS Technologies, Inc.
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/vtophys.hh"
44#include "arch/mips/idle_event.hh"
45#include "arch/mips/linux/system.hh"
46#include "arch/mips/linux/threadinfo.hh"
47#include "arch/mips/system.hh"
48#include "base/loader/symtab.hh"
49#include "cpu/thread_context.hh"
50#include "cpu/base.hh"
51#include "dev/platform.hh"
52#include "kern/linux/printk.hh"
53#include "kern/linux/events.hh"
54#include "mem/physical.hh"
55#include "mem/port.hh"
56#include "sim/arguments.hh"
57#include "sim/byteswap.hh"
58
59using namespace std;
60using namespace MipsISA;
61using namespace Linux;
62
63LinuxMipsSystem::LinuxMipsSystem(Params *p)
64    : MipsSystem(p)
65{
66    Addr addr = 0;
67
68    /**
69     * The symbol swapper_pg_dir marks the beginning of the kernel and
70     * the location of bootloader passed arguments
71     */
72    if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
73        panic("Could not determine start location of kernel");
74    }
75
76    /**
77     * Since we aren't using a bootloader, we have to copy the
78     * kernel arguments directly into the kernel's memory.
79     */
80    virtPort.writeBlob(CommandLine(), (uint8_t*)params()->boot_osflags.c_str(),
81                params()->boot_osflags.length()+1);
82
83    /**
84     * find the address of the est_cycle_freq variable and insert it
85     * so we don't through the lengthly process of trying to
86     * calculated it by using the PIT, RTC, etc.
87     */
88    if (kernelSymtab->findAddress("est_cycle_freq", addr))
89        virtPort.write(addr, (uint64_t)(Clock::Frequency /
90                    p->boot_cpu_frequency));
91
92
93    /**
94     * EV5 only supports 127 ASNs so we are going to tell the kernel that the
95     * paritiuclar EV6 we have only supports 127 asns.
96     * @todo At some point we should change ev5.hh and the palcode to support
97     * 255 ASNs.
98     */
99    if (kernelSymtab->findAddress("dp264_mv", addr))
100        virtPort.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
101    else
102        panic("could not find dp264_mv\n");
103
104#ifndef NDEBUG
105    kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
106    if (!kernelPanicEvent)
107        panic("could not find kernel symbol \'panic\'");
108
109#if 0
110    kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel");
111    if (!kernelDieEvent)
112        panic("could not find kernel symbol \'die_if_kernel\'");
113#endif
114
115#endif
116
117    /**
118     * Any time ide_delay_50ms, calibarte_delay or
119     * determine_cpu_caches is called just skip the
120     * function. Currently determine_cpu_caches only is used put
121     * information in proc, however if that changes in the future we
122     * will have to fill in the cache size variables appropriately.
123     */
124
125    skipIdeDelay50msEvent =
126        addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
127    skipDelayLoopEvent =
128        addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
129    skipCacheProbeEvent =
130        addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
131    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
132    idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
133
134    // Disable for now as it runs into panic() calls in VPTr methods
135    // (see sim/vptr.hh).  Once those bugs are fixed, we can
136    // re-enable, but we should find a better way to turn it on than
137    // using DTRACE(Thread), since looking at a trace flag at tick 0
138    // leads to non-intuitive behavior with --trace-start.
139    if (false && kernelSymtab->findAddress("mips_switch_to", addr)) {
140        printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
141                                               addr + sizeof(MachInst) * 6);
142    } else {
143        printThreadEvent = NULL;
144    }
145}
146
147LinuxMipsSystem::~LinuxMipsSystem()
148{
149#ifndef NDEBUG
150    delete kernelPanicEvent;
151#endif
152    delete skipIdeDelay50msEvent;
153    delete skipDelayLoopEvent;
154    delete skipCacheProbeEvent;
155    delete debugPrintkEvent;
156    delete idleStartEvent;
157    delete printThreadEvent;
158}
159
160
161void
162LinuxMipsSystem::setDelayLoop(ThreadContext *tc)
163{
164    Addr addr = 0;
165    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
166        Tick cpuFreq = tc->getCpuPtr()->frequency();
167        Tick intrFreq = platform->intrFrequency();
168        VirtualPort *vp;
169
170        vp = tc->getVirtPort();
171        vp->writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988));
172        tc->delVirtPort(vp);
173    }
174}
175
176
177void
178LinuxMipsSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
179{
180    SkipFuncEvent::process(tc);
181    // calculate and set loops_per_jiffy
182    ((LinuxMipsSystem *)tc->getSystemPtr())->setDelayLoop(tc);
183}
184
185void
186LinuxMipsSystem::PrintThreadInfo::process(ThreadContext *tc)
187{
188    Linux::ThreadInfo ti(tc);
189
190    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
191            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
192}
193
194LinuxMipsSystem *
195LinuxMipsSystemParams::create()
196{
197    return new LinuxMipsSystem(this);
198}
199