system.cc revision 2665:a124942bacb8 
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/linux/system.hh"
46#include "arch/alpha/linux/threadinfo.hh"
47#include "arch/alpha/system.hh"
48#include "base/loader/symtab.hh"
49#include "cpu/exec_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/builder.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    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    if (kernelSymtab->findAddress("alpha_switch_to", addr) && DTRACE(Thread)) {
135        printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
136                                               addr + sizeof(MachInst) * 6);
137    } else {
138        printThreadEvent = NULL;
139    }
140
141    if (params()->bin_int) {
142        intStartEvent = addPalFuncEvent<InterruptStartEvent>("sys_int_21");
143        if (!intStartEvent)
144            panic("could not find symbol: sys_int_21\n");
145
146        intEndEvent = addPalFuncEvent<InterruptEndEvent>("rti_to_kern");
147        if (!intEndEvent)
148            panic("could not find symbol: rti_to_kern\n");
149
150        intEndEvent2 = addPalFuncEvent<InterruptEndEvent>("rti_to_user");
151        if (!intEndEvent2)
152            panic("could not find symbol: rti_to_user\n");
153
154        intEndEvent3 = addKernelFuncEvent<InterruptEndEvent>("do_softirq");
155        if (!intEndEvent3)
156            panic("could not find symbol: do_softirq\n");
157    }
158}
159
160LinuxAlphaSystem::~LinuxAlphaSystem()
161{
162#ifndef NDEBUG
163    delete kernelPanicEvent;
164#endif
165    delete skipIdeDelay50msEvent;
166    delete skipDelayLoopEvent;
167    delete skipCacheProbeEvent;
168    delete debugPrintkEvent;
169    delete idleStartEvent;
170    delete printThreadEvent;
171    delete intStartEvent;
172    delete intEndEvent;
173    delete intEndEvent2;
174}
175
176
177void
178LinuxAlphaSystem::setDelayLoop(ExecContext *xc)
179{
180    Addr addr = 0;
181    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
182        Tick cpuFreq = xc->getCpuPtr()->frequency();
183        Tick intrFreq = platform->intrFrequency();
184        xc->getVirtPort(xc)->write(addr,
185                (uint32_t)((cpuFreq / intrFreq) * 0.9988));
186    }
187}
188
189
190void
191LinuxAlphaSystem::SkipDelayLoopEvent::process(ExecContext *xc)
192{
193    SkipFuncEvent::process(xc);
194    // calculate and set loops_per_jiffy
195    ((LinuxAlphaSystem *)xc->getSystemPtr())->setDelayLoop(xc);
196}
197
198void
199LinuxAlphaSystem::PrintThreadInfo::process(ExecContext *xc)
200{
201    Linux::ThreadInfo ti(xc);
202
203    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
204            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
205}
206
207
208BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
209
210    Param<Tick> boot_cpu_frequency;
211    SimObjectParam<PhysicalMemory *> physmem;
212
213    Param<string> kernel;
214    Param<string> console;
215    Param<string> pal;
216
217    Param<string> boot_osflags;
218    Param<string> readfile;
219    Param<unsigned int> init_param;
220
221    Param<uint64_t> system_type;
222    Param<uint64_t> system_rev;
223
224    Param<bool> bin;
225    VectorParam<string> binned_fns;
226    Param<bool> bin_int;
227
228END_DECLARE_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
229
230BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
231
232    INIT_PARAM(boot_cpu_frequency, "Frequency of the boot CPU"),
233    INIT_PARAM(physmem, "phsyical memory"),
234    INIT_PARAM(kernel, "file that contains the kernel code"),
235    INIT_PARAM(console, "file that contains the console code"),
236    INIT_PARAM(pal, "file that contains palcode"),
237    INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot",
238                    "a"),
239    INIT_PARAM_DFLT(readfile, "file to read startup script from", ""),
240    INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
241    INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34),
242    INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10),
243    INIT_PARAM_DFLT(bin, "is this system to be binned", false),
244    INIT_PARAM(binned_fns, "functions to be broken down and binned"),
245    INIT_PARAM_DFLT(bin_int, "is interrupt code binned seperately?", true)
246
247END_INIT_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
248
249CREATE_SIM_OBJECT(LinuxAlphaSystem)
250{
251    AlphaSystem::Params *p = new AlphaSystem::Params;
252    p->name = getInstanceName();
253    p->boot_cpu_frequency = boot_cpu_frequency;
254    p->physmem = physmem;
255    p->kernel_path = kernel;
256    p->console_path = console;
257    p->palcode = pal;
258    p->boot_osflags = boot_osflags;
259    p->init_param = init_param;
260    p->readfile = readfile;
261    p->system_type = system_type;
262    p->system_rev = system_rev;
263    p->bin = bin;
264    p->binned_fns = binned_fns;
265    p->bin_int = bin_int;
266    return new LinuxAlphaSystem(p);
267}
268
269REGISTER_SIM_OBJECT("LinuxAlphaSystem", LinuxAlphaSystem)
270
271