system.cc revision 9645:c483700ae0ce 
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/alpha/linux/system.hh"
44#include "arch/alpha/idle_event.hh"
45#include "arch/alpha/system.hh"
46#include "arch/generic/linux/threadinfo.hh"
47#include "arch/vtophys.hh"
48#include "base/loader/symtab.hh"
49#include "cpu/base.hh"
50#include "cpu/thread_context.hh"
51#include "debug/Thread.hh"
52#include "kern/linux/events.hh"
53#include "kern/linux/printk.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 AlphaISA;
61using namespace Linux;
62
63LinuxAlphaSystem::LinuxAlphaSystem(Params *p)
64    : AlphaSystem(p)
65{
66}
67
68void
69LinuxAlphaSystem::initState()
70{
71    // Moved from the constructor to here since it relies on the
72    // address map being resolved in the interconnect
73
74    // Call the initialisation of the super class
75    AlphaSystem::initState();
76
77    Addr addr = 0;
78
79    /**
80     * The symbol swapper_pg_dir marks the beginning of the kernel and
81     * the location of bootloader passed arguments
82     */
83    if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
84        panic("Could not determine start location of kernel");
85    }
86
87    /**
88     * Since we aren't using a bootloader, we have to copy the
89     * kernel arguments directly into the kernel's memory.
90     */
91    virtProxy.writeBlob(CommandLine(),
92                        (uint8_t*)params()->boot_osflags.c_str(),
93                        params()->boot_osflags.length()+1);
94
95    /**
96     * find the address of the est_cycle_freq variable and insert it
97     * so we don't through the lengthly process of trying to
98     * calculated it by using the PIT, RTC, etc.
99     */
100    if (kernelSymtab->findAddress("est_cycle_freq", addr))
101        virtProxy.write(addr, (uint64_t)(SimClock::Frequency /
102                                         params()->boot_cpu_frequency));
103
104
105    /**
106     * EV5 only supports 127 ASNs so we are going to tell the kernel that the
107     * paritiuclar EV6 we have only supports 127 asns.
108     * @todo At some point we should change ev5.hh and the palcode to support
109     * 255 ASNs.
110     */
111    if (kernelSymtab->findAddress("dp264_mv", addr))
112        virtProxy.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
113    else
114        panic("could not find dp264_mv\n");
115
116}
117
118void
119LinuxAlphaSystem::setupFuncEvents()
120{
121    AlphaSystem::setupFuncEvents();
122#ifndef NDEBUG
123    kernelPanicEvent = addKernelFuncEventOrPanic<BreakPCEvent>("panic");
124
125#if 0
126    kernelDieEvent = addKernelFuncEventOrPanic<BreakPCEvent>("die_if_kernel");
127#endif
128
129#endif
130
131    /**
132     * Any time ide_delay_50ms, calibarte_delay or
133     * determine_cpu_caches is called just skip the
134     * function. Currently determine_cpu_caches only is used put
135     * information in proc, however if that changes in the future we
136     * will have to fill in the cache size variables appropriately.
137     */
138
139    skipIdeDelay50msEvent =
140        addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
141    skipDelayLoopEvent =
142        addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
143    skipCacheProbeEvent =
144        addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
145    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
146    idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
147
148    // Disable for now as it runs into panic() calls in VPTr methods
149    // (see sim/vptr.hh).  Once those bugs are fixed, we can
150    // re-enable, but we should find a better way to turn it on than
151    // using DTRACE(Thread), since looking at a trace flag at tick 0
152    // leads to non-intuitive behavior with --trace-start.
153    Addr addr = 0;
154    if (false && kernelSymtab->findAddress("alpha_switch_to", addr)) {
155        printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
156                                               addr + sizeof(MachInst) * 6);
157    } else {
158        printThreadEvent = NULL;
159    }
160}
161
162LinuxAlphaSystem::~LinuxAlphaSystem()
163{
164#ifndef NDEBUG
165    delete kernelPanicEvent;
166#endif
167    delete skipIdeDelay50msEvent;
168    delete skipDelayLoopEvent;
169    delete skipCacheProbeEvent;
170    delete debugPrintkEvent;
171    delete idleStartEvent;
172    delete printThreadEvent;
173}
174
175void
176LinuxAlphaSystem::setDelayLoop(ThreadContext *tc)
177{
178    Addr addr = 0;
179    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
180        Tick cpuFreq = tc->getCpuPtr()->frequency();
181        assert(intrFreq);
182        FSTranslatingPortProxy &vp = tc->getVirtProxy();
183        vp.writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988));
184    }
185}
186
187void
188LinuxAlphaSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
189{
190    SkipFuncEvent::process(tc);
191    // calculate and set loops_per_jiffy
192    ((LinuxAlphaSystem *)tc->getSystemPtr())->setDelayLoop(tc);
193}
194
195void
196LinuxAlphaSystem::PrintThreadInfo::process(ThreadContext *tc)
197{
198    Linux::ThreadInfo ti(tc);
199
200    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
201            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
202}
203
204LinuxAlphaSystem *
205LinuxAlphaSystemParams::create()
206{
207    return new LinuxAlphaSystem(this);
208}
209