system.cc revision 1855 
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
29/**
30 * @file
31 * This code loads the linux kernel, console, pal and patches certain
32 * functions.  The symbol tables are loaded so that traces can show
33 * the executing function and we can skip functions. Various delay
34 * loops are skipped and their final values manually computed to speed
35 * up boot time.
36 */
37
38#include "base/loader/symtab.hh"
39#include "cpu/exec_context.hh"
40#include "cpu/base.hh"
41#include "kern/linux/linux_events.hh"
42#include "kern/linux/linux_system.hh"
43#include "mem/functional/memory_control.hh"
44#include "mem/functional/physical.hh"
45#include "sim/builder.hh"
46#include "dev/platform.hh"
47#include "targetarch/vtophys.hh"
48
49using namespace std;
50
51LinuxSystem::LinuxSystem(Params *p)
52    : System(p)
53{
54    Addr addr = 0;
55    Addr paddr = 0;
56
57    /**
58     * The symbol swapper_pg_dir marks the beginning of the kernel and
59     * the location of bootloader passed arguments
60     */
61    if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
62        panic("Could not determine start location of kernel");
63    }
64
65    /**
66     * Since we aren't using a bootloader, we have to copy the
67     * kernel arguments directly into the kernel's memory.
68     */
69    paddr = vtophys(physmem, CommandLine());
70    char *commandline = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
71    if (commandline)
72        strncpy(commandline, params->boot_osflags.c_str(), CommandLineSize);
73
74    /**
75     * find the address of the est_cycle_freq variable and insert it
76     * so we don't through the lengthly process of trying to
77     * calculated it by using the PIT, RTC, etc.
78     */
79    if (kernelSymtab->findAddress("est_cycle_freq", addr)) {
80        paddr = vtophys(physmem, addr);
81        uint8_t *est_cycle_frequency =
82            physmem->dma_addr(paddr, sizeof(uint64_t));
83
84        if (est_cycle_frequency)
85            *(uint64_t *)est_cycle_frequency =
86                Clock::Frequency / p->boot_cpu_frequency;
87    }
88
89
90    /**
91     * EV5 only supports 127 ASNs so we are going to tell the kernel that the
92     * paritiuclar EV6 we have only supports 127 asns.
93     * @todo At some point we should change ev5.hh and the palcode to support
94     * 255 ASNs.
95     */
96    if (kernelSymtab->findAddress("dp264_mv", addr)) {
97        paddr = vtophys(physmem, addr);
98        char *dp264_mv = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
99
100        if (dp264_mv) {
101            *(uint32_t*)(dp264_mv+0x18) = htog((uint32_t)127);
102        } else
103            panic("could not translate dp264_mv addr\n");
104
105    } else
106        panic("could not find dp264_mv\n");
107
108#ifndef NDEBUG
109    kernelPanicEvent = new BreakPCEvent(&pcEventQueue, "kernel panic");
110    if (kernelSymtab->findAddress("panic", addr))
111        kernelPanicEvent->schedule(addr);
112    else
113        panic("could not find kernel symbol \'panic\'");
114#if 0
115    kernelDieEvent = new BreakPCEvent(&pcEventQueue, "die if kernel");
116    if (kernelSymtab->findAddress("die_if_kernel", addr))
117        kernelDieEvent->schedule(addr);
118    else
119        panic("could not find kernel symbol \'die_if_kernel\'");
120#endif
121
122#endif
123
124    /**
125     * Any time ide_delay_50ms, calibarte_delay or
126     * determine_cpu_caches is called just skip the
127     * function. Currently determine_cpu_caches only is used put
128     * information in proc, however if that changes in the future we
129     * will have to fill in the cache size variables appropriately.
130     */
131    skipIdeDelay50msEvent = new SkipFuncEvent(&pcEventQueue, "ide_delay_50ms");
132    if (kernelSymtab->findAddress("ide_delay_50ms", addr))
133        skipIdeDelay50msEvent->schedule(addr+sizeof(MachInst));
134
135    skipDelayLoopEvent = new LinuxSkipDelayLoopEvent(&pcEventQueue,
136                                                     "calibrate_delay");
137    if (kernelSymtab->findAddress("calibrate_delay", addr)) {
138        skipDelayLoopEvent->schedule(addr + 3 * sizeof(MachInst));
139    }
140
141    skipCacheProbeEvent = new SkipFuncEvent(&pcEventQueue,
142                                            "determine_cpu_caches");
143    if (kernelSymtab->findAddress("determine_cpu_caches", addr))
144        skipCacheProbeEvent->schedule(addr+sizeof(MachInst));
145
146    debugPrintkEvent = new DebugPrintkEvent(&pcEventQueue, "dprintk");
147    if (kernelSymtab->findAddress("dprintk", addr))
148        debugPrintkEvent->schedule(addr+8);
149
150    idleStartEvent = new IdleStartEvent(&pcEventQueue, "cpu_idle", this);
151    if (kernelSymtab->findAddress("cpu_idle", addr))
152        idleStartEvent->schedule(addr);
153
154    printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo");
155    if (kernelSymtab->findAddress("alpha_switch_to", addr) && DTRACE(Thread))
156        printThreadEvent->schedule(addr + sizeof(MachInst) * 6);
157
158    intStartEvent = new InterruptStartEvent(&pcEventQueue, "intStartEvent");
159
160    if (params->bin_int) {
161        if (palSymtab->findAddress("sys_int_21", addr))
162            intStartEvent->schedule(addr + sizeof(MachInst) * 2);
163        else
164            panic("could not find symbol: sys_int_21\n");
165
166        intEndEvent = new InterruptEndEvent(&pcEventQueue, "intEndEvent");
167        if (palSymtab->findAddress("rti_to_kern", addr))
168            intEndEvent->schedule(addr) ;
169        else
170            panic("could not find symbol: rti_to_kern\n");
171
172        intEndEvent2 = new InterruptEndEvent(&pcEventQueue, "intEndEvent2");
173        if (palSymtab->findAddress("rti_to_user", addr))
174            intEndEvent2->schedule(addr);
175        else
176            panic("could not find symbol: rti_to_user\n");
177
178
179        intEndEvent3 = new InterruptEndEvent(&pcEventQueue, "intEndEvent3");
180        if (kernelSymtab->findAddress("do_softirq", addr))
181            intEndEvent3->schedule(addr + sizeof(MachInst) * 2);
182        else
183            panic("could not find symbol: do_softirq\n");
184    }
185}
186
187LinuxSystem::~LinuxSystem()
188{
189#ifndef NDEBUG
190    delete kernelPanicEvent;
191#endif
192    delete skipIdeDelay50msEvent;
193    delete skipDelayLoopEvent;
194    delete skipCacheProbeEvent;
195    delete debugPrintkEvent;
196    delete idleStartEvent;
197    delete printThreadEvent;
198    delete intStartEvent;
199    delete intEndEvent;
200    delete intEndEvent2;
201}
202
203
204void
205LinuxSystem::setDelayLoop(ExecContext *xc)
206{
207    Addr addr = 0;
208    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
209        Addr paddr = vtophys(physmem, addr);
210
211        uint8_t *loops_per_jiffy =
212            physmem->dma_addr(paddr, sizeof(uint32_t));
213
214        Tick cpuFreq = xc->cpu->frequency();
215        Tick intrFreq = platform->intrFrequency();
216        *(uint32_t *)loops_per_jiffy =
217            (uint32_t)((cpuFreq / intrFreq) * 0.9988);
218    }
219}
220
221BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
222
223    Param<Tick> boot_cpu_frequency;
224    SimObjectParam<MemoryController *> memctrl;
225    SimObjectParam<PhysicalMemory *> physmem;
226
227    Param<string> kernel;
228    Param<string> console;
229    Param<string> pal;
230
231    Param<string> boot_osflags;
232    Param<string> readfile;
233    Param<unsigned int> init_param;
234
235    Param<uint64_t> system_type;
236    Param<uint64_t> system_rev;
237
238    Param<bool> bin;
239    VectorParam<string> binned_fns;
240    Param<bool> bin_int;
241
242END_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
243
244BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
245
246    INIT_PARAM(boot_cpu_frequency, "Frequency of the boot CPU"),
247    INIT_PARAM(memctrl, "memory controller"),
248    INIT_PARAM(physmem, "phsyical memory"),
249    INIT_PARAM(kernel, "file that contains the kernel code"),
250    INIT_PARAM(console, "file that contains the console code"),
251    INIT_PARAM(pal, "file that contains palcode"),
252    INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot",
253                    "a"),
254    INIT_PARAM_DFLT(readfile, "file to read startup script from", ""),
255    INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
256    INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34),
257    INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10),
258    INIT_PARAM_DFLT(bin, "is this system to be binned", false),
259    INIT_PARAM(binned_fns, "functions to be broken down and binned"),
260    INIT_PARAM_DFLT(bin_int, "is interrupt code binned seperately?", true)
261
262END_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
263
264CREATE_SIM_OBJECT(LinuxSystem)
265{
266    System::Params *p = new System::Params;
267    p->name = getInstanceName();
268    p->boot_cpu_frequency = boot_cpu_frequency;
269    p->memctrl = memctrl;
270    p->physmem = physmem;
271    p->kernel_path = kernel;
272    p->console_path = console;
273    p->palcode = pal;
274    p->boot_osflags = boot_osflags;
275    p->init_param = init_param;
276    p->readfile = readfile;
277    p->system_type = system_type;
278    p->system_rev = system_rev;
279    p->bin = bin;
280    p->binned_fns = binned_fns;
281    p->bin_int = bin_int;
282    return new LinuxSystem(p);
283}
284
285REGISTER_SIM_OBJECT("LinuxSystem", LinuxSystem)
286
287