system.cc revision 1885 
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_system.hh"
42#include "kern/linux/linux_threadinfo.hh"
43#include "kern/linux/printk.hh"
44#include "mem/functional/memory_control.hh"
45#include "mem/functional/physical.hh"
46#include "sim/builder.hh"
47#include "dev/platform.hh"
48#include "targetarch/arguments.hh"
49#include "targetarch/vtophys.hh"
50
51using namespace std;
52
53LinuxSystem::LinuxSystem(Params *p)
54    : System(p)
55{
56    Addr addr = 0;
57    Addr paddr = 0;
58
59    /**
60     * The symbol swapper_pg_dir marks the beginning of the kernel and
61     * the location of bootloader passed arguments
62     */
63    if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
64        panic("Could not determine start location of kernel");
65    }
66
67    /**
68     * Since we aren't using a bootloader, we have to copy the
69     * kernel arguments directly into the kernel's memory.
70     */
71    paddr = vtophys(physmem, CommandLine());
72    char *commandline = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
73    if (commandline)
74        strncpy(commandline, params->boot_osflags.c_str(), CommandLineSize);
75
76    /**
77     * find the address of the est_cycle_freq variable and insert it
78     * so we don't through the lengthly process of trying to
79     * calculated it by using the PIT, RTC, etc.
80     */
81    if (kernelSymtab->findAddress("est_cycle_freq", addr)) {
82        paddr = vtophys(physmem, addr);
83        uint8_t *est_cycle_frequency =
84            physmem->dma_addr(paddr, sizeof(uint64_t));
85
86        if (est_cycle_frequency)
87            *(uint64_t *)est_cycle_frequency =
88                Clock::Frequency / p->boot_cpu_frequency;
89    }
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        paddr = vtophys(physmem, addr);
100        char *dp264_mv = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
101
102        if (dp264_mv) {
103            *(uint32_t*)(dp264_mv+0x18) = htog((uint32_t)127);
104        } else
105            panic("could not translate dp264_mv addr\n");
106
107    } else
108        panic("could not find dp264_mv\n");
109
110#ifndef NDEBUG
111    kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
112    if (!kernelPanicEvent)
113        panic("could not find kernel symbol \'panic\'");
114
115#if 0
116    kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel");
117    if (!kernelDieEvent)
118        panic("could not find kernel symbol \'die_if_kernel\'");
119#endif
120
121#endif
122
123    /**
124v     * Any time ide_delay_50ms, calibarte_delay or
125     * determine_cpu_caches is called just skip the
126     * function. Currently determine_cpu_caches only is used put
127     * information in proc, however if that changes in the future we
128     * will have to fill in the cache size variables appropriately.
129     */
130
131    skipIdeDelay50msEvent =
132        addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
133    skipDelayLoopEvent =
134        addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
135    skipCacheProbeEvent =
136        addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
137    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
138    idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
139
140    if (kernelSymtab->findAddress("alpha_switch_to", addr) && DTRACE(Thread)) {
141        printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
142                                               addr + sizeof(MachInst) * 6);
143    } else {
144        printThreadEvent = NULL;
145    }
146
147    if (params->bin_int) {
148        intStartEvent = addPalFuncEvent<InterruptStartEvent>("sys_int_21");
149        if (!intStartEvent)
150            panic("could not find symbol: sys_int_21\n");
151
152        intEndEvent = addPalFuncEvent<InterruptEndEvent>("rti_to_kern");
153        if (!intEndEvent)
154            panic("could not find symbol: rti_to_kern\n");
155
156        intEndEvent2 = addPalFuncEvent<InterruptEndEvent>("rti_to_user");
157        if (!intEndEvent2)
158            panic("could not find symbol: rti_to_user\n");
159
160        intEndEvent3 = addKernelFuncEvent<InterruptEndEvent>("do_softirq");
161        if (!intEndEvent3)
162            panic("could not find symbol: do_softirq\n");
163    }
164}
165
166LinuxSystem::~LinuxSystem()
167{
168#ifndef NDEBUG
169    delete kernelPanicEvent;
170#endif
171    delete skipIdeDelay50msEvent;
172    delete skipDelayLoopEvent;
173    delete skipCacheProbeEvent;
174    delete debugPrintkEvent;
175    delete idleStartEvent;
176    delete printThreadEvent;
177    delete intStartEvent;
178    delete intEndEvent;
179    delete intEndEvent2;
180}
181
182
183void
184LinuxSystem::setDelayLoop(ExecContext *xc)
185{
186    Addr addr = 0;
187    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
188        Addr paddr = vtophys(physmem, addr);
189
190        uint8_t *loops_per_jiffy =
191            physmem->dma_addr(paddr, sizeof(uint32_t));
192
193        Tick cpuFreq = xc->cpu->frequency();
194        Tick intrFreq = platform->intrFrequency();
195        *(uint32_t *)loops_per_jiffy =
196            (uint32_t)((cpuFreq / intrFreq) * 0.9988);
197    }
198}
199
200void
201LinuxSystem::SkipDelayLoopEvent::process(ExecContext *xc)
202{
203    SkipFuncEvent::process(xc);
204    // calculate and set loops_per_jiffy
205    ((LinuxSystem *)xc->system)->setDelayLoop(xc);
206}
207
208void
209LinuxSystem::DebugPrintkEvent::process(ExecContext *xc)
210{
211    if (DTRACE(DebugPrintf)) {
212        if (!raw) {
213            StringWrap name(xc->system->name() + ".dprintk");
214            DPRINTFN("");
215        }
216
217        AlphaArguments args(xc);
218        Printk(args);
219        SkipFuncEvent::process(xc);
220    }
221}
222
223void
224LinuxSystem::PrintThreadInfo::process(ExecContext *xc)
225{
226    Linux::ThreadInfo ti(xc);
227
228    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
229            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
230}
231
232
233BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
234
235    Param<Tick> boot_cpu_frequency;
236    SimObjectParam<MemoryController *> memctrl;
237    SimObjectParam<PhysicalMemory *> physmem;
238
239    Param<string> kernel;
240    Param<string> console;
241    Param<string> pal;
242
243    Param<string> boot_osflags;
244    Param<string> readfile;
245    Param<unsigned int> init_param;
246
247    Param<uint64_t> system_type;
248    Param<uint64_t> system_rev;
249
250    Param<bool> bin;
251    VectorParam<string> binned_fns;
252    Param<bool> bin_int;
253
254END_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
255
256BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
257
258    INIT_PARAM(boot_cpu_frequency, "Frequency of the boot CPU"),
259    INIT_PARAM(memctrl, "memory controller"),
260    INIT_PARAM(physmem, "phsyical memory"),
261    INIT_PARAM(kernel, "file that contains the kernel code"),
262    INIT_PARAM(console, "file that contains the console code"),
263    INIT_PARAM(pal, "file that contains palcode"),
264    INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot",
265                    "a"),
266    INIT_PARAM_DFLT(readfile, "file to read startup script from", ""),
267    INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
268    INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34),
269    INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10),
270    INIT_PARAM_DFLT(bin, "is this system to be binned", false),
271    INIT_PARAM(binned_fns, "functions to be broken down and binned"),
272    INIT_PARAM_DFLT(bin_int, "is interrupt code binned seperately?", true)
273
274END_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
275
276CREATE_SIM_OBJECT(LinuxSystem)
277{
278    System::Params *p = new System::Params;
279    p->name = getInstanceName();
280    p->boot_cpu_frequency = boot_cpu_frequency;
281    p->memctrl = memctrl;
282    p->physmem = physmem;
283    p->kernel_path = kernel;
284    p->console_path = console;
285    p->palcode = pal;
286    p->boot_osflags = boot_osflags;
287    p->init_param = init_param;
288    p->readfile = readfile;
289    p->system_type = system_type;
290    p->system_rev = system_rev;
291    p->bin = bin;
292    p->binned_fns = binned_fns;
293    p->bin_int = bin_int;
294    return new LinuxSystem(p);
295}
296
297REGISTER_SIM_OBJECT("LinuxSystem", LinuxSystem)
298
299