system.cc revision 2158 
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 "arch/alpha/system.hh"
39#include "base/loader/symtab.hh"
40#include "cpu/exec_context.hh"
41#include "cpu/base.hh"
42#include "kern/linux/linux_system.hh"
43#include "kern/linux/linux_threadinfo.hh"
44#include "kern/linux/printk.hh"
45#include "mem/functional/memory_control.hh"
46#include "mem/functional/physical.hh"
47#include "sim/builder.hh"
48#include "sim/byteswap.hh"
49#include "dev/platform.hh"
50#include "targetarch/arguments.hh"
51#include "targetarch/vtophys.hh"
52
53using namespace std;
54using namespace TheISA;
55
56LinuxSystem::LinuxSystem(Params *p)
57    : AlphaSystem(p)
58{
59    Addr addr = 0;
60    Addr paddr = 0;
61
62    /**
63     * The symbol swapper_pg_dir marks the beginning of the kernel and
64     * the location of bootloader passed arguments
65     */
66    if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
67        panic("Could not determine start location of kernel");
68    }
69
70    /**
71     * Since we aren't using a bootloader, we have to copy the
72     * kernel arguments directly into the kernel's memory.
73     */
74    paddr = vtophys(physmem, CommandLine());
75    char *commandline = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
76    if (commandline)
77        strncpy(commandline, params()->boot_osflags.c_str(), CommandLineSize);
78
79    /**
80     * find the address of the est_cycle_freq variable and insert it
81     * so we don't through the lengthly process of trying to
82     * calculated it by using the PIT, RTC, etc.
83     */
84    if (kernelSymtab->findAddress("est_cycle_freq", addr)) {
85        paddr = vtophys(physmem, addr);
86        uint8_t *est_cycle_frequency =
87            physmem->dma_addr(paddr, sizeof(uint64_t));
88
89        if (est_cycle_frequency)
90            *(uint64_t *)est_cycle_frequency =
91                Clock::Frequency / p->boot_cpu_frequency;
92    }
93
94
95    /**
96     * EV5 only supports 127 ASNs so we are going to tell the kernel that the
97     * paritiuclar EV6 we have only supports 127 asns.
98     * @todo At some point we should change ev5.hh and the palcode to support
99     * 255 ASNs.
100     */
101    if (kernelSymtab->findAddress("dp264_mv", addr)) {
102        paddr = vtophys(physmem, addr);
103        char *dp264_mv = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
104
105        if (dp264_mv) {
106            *(uint32_t*)(dp264_mv+0x18) = LittleEndianGuest::htog((uint32_t)127);
107        } else
108            panic("could not translate dp264_mv addr\n");
109
110    } else
111        panic("could not find dp264_mv\n");
112
113#ifndef NDEBUG
114    kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
115    if (!kernelPanicEvent)
116        panic("could not find kernel symbol \'panic\'");
117
118#if 0
119    kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel");
120    if (!kernelDieEvent)
121        panic("could not find kernel symbol \'die_if_kernel\'");
122#endif
123
124#endif
125
126    /**
127     * Any time ide_delay_50ms, calibarte_delay or
128     * determine_cpu_caches is called just skip the
129     * function. Currently determine_cpu_caches only is used put
130     * information in proc, however if that changes in the future we
131     * will have to fill in the cache size variables appropriately.
132     */
133
134    skipIdeDelay50msEvent =
135        addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
136    skipDelayLoopEvent =
137        addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
138    skipCacheProbeEvent =
139        addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
140    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
141    idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
142
143    if (kernelSymtab->findAddress("alpha_switch_to", addr) && DTRACE(Thread)) {
144        printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
145                                               addr + sizeof(MachInst) * 6);
146    } else {
147        printThreadEvent = NULL;
148    }
149
150    if (params()->bin_int) {
151        intStartEvent = addPalFuncEvent<InterruptStartEvent>("sys_int_21");
152        if (!intStartEvent)
153            panic("could not find symbol: sys_int_21\n");
154
155        intEndEvent = addPalFuncEvent<InterruptEndEvent>("rti_to_kern");
156        if (!intEndEvent)
157            panic("could not find symbol: rti_to_kern\n");
158
159        intEndEvent2 = addPalFuncEvent<InterruptEndEvent>("rti_to_user");
160        if (!intEndEvent2)
161            panic("could not find symbol: rti_to_user\n");
162
163        intEndEvent3 = addKernelFuncEvent<InterruptEndEvent>("do_softirq");
164        if (!intEndEvent3)
165            panic("could not find symbol: do_softirq\n");
166    }
167}
168
169LinuxSystem::~LinuxSystem()
170{
171#ifndef NDEBUG
172    delete kernelPanicEvent;
173#endif
174    delete skipIdeDelay50msEvent;
175    delete skipDelayLoopEvent;
176    delete skipCacheProbeEvent;
177    delete debugPrintkEvent;
178    delete idleStartEvent;
179    delete printThreadEvent;
180    delete intStartEvent;
181    delete intEndEvent;
182    delete intEndEvent2;
183}
184
185
186void
187LinuxSystem::setDelayLoop(ExecContext *xc)
188{
189    Addr addr = 0;
190    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
191        Addr paddr = vtophys(physmem, addr);
192
193        uint8_t *loops_per_jiffy =
194            physmem->dma_addr(paddr, sizeof(uint32_t));
195
196        Tick cpuFreq = xc->cpu->frequency();
197        Tick intrFreq = platform->intrFrequency();
198        *(uint32_t *)loops_per_jiffy =
199            (uint32_t)((cpuFreq / intrFreq) * 0.9988);
200    }
201}
202
203void
204LinuxSystem::SkipDelayLoopEvent::process(ExecContext *xc)
205{
206    SkipFuncEvent::process(xc);
207    // calculate and set loops_per_jiffy
208    ((LinuxSystem *)xc->system)->setDelayLoop(xc);
209}
210
211void
212LinuxSystem::DebugPrintkEvent::process(ExecContext *xc)
213{
214    if (DTRACE(DebugPrintf)) {
215        if (!raw) {
216            StringWrap name(xc->system->name() + ".dprintk");
217            DPRINTFN("");
218        }
219
220        AlphaArguments args(xc);
221        Printk(args);
222        SkipFuncEvent::process(xc);
223    }
224}
225
226void
227LinuxSystem::PrintThreadInfo::process(ExecContext *xc)
228{
229    Linux::ThreadInfo ti(xc);
230
231    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
232            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
233}
234
235
236BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
237
238    Param<Tick> boot_cpu_frequency;
239    SimObjectParam<MemoryController *> memctrl;
240    SimObjectParam<PhysicalMemory *> physmem;
241
242    Param<string> kernel;
243    Param<string> console;
244    Param<string> pal;
245
246    Param<string> boot_osflags;
247    Param<string> readfile;
248    Param<unsigned int> init_param;
249
250    Param<uint64_t> system_type;
251    Param<uint64_t> system_rev;
252
253    Param<bool> bin;
254    VectorParam<string> binned_fns;
255    Param<bool> bin_int;
256
257END_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
258
259BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
260
261    INIT_PARAM(boot_cpu_frequency, "Frequency of the boot CPU"),
262    INIT_PARAM(memctrl, "memory controller"),
263    INIT_PARAM(physmem, "phsyical memory"),
264    INIT_PARAM(kernel, "file that contains the kernel code"),
265    INIT_PARAM(console, "file that contains the console code"),
266    INIT_PARAM(pal, "file that contains palcode"),
267    INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot",
268                    "a"),
269    INIT_PARAM_DFLT(readfile, "file to read startup script from", ""),
270    INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
271    INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34),
272    INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10),
273    INIT_PARAM_DFLT(bin, "is this system to be binned", false),
274    INIT_PARAM(binned_fns, "functions to be broken down and binned"),
275    INIT_PARAM_DFLT(bin_int, "is interrupt code binned seperately?", true)
276
277END_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
278
279CREATE_SIM_OBJECT(LinuxSystem)
280{
281    AlphaSystem::Params *p = new AlphaSystem::Params;
282    p->name = getInstanceName();
283    p->boot_cpu_frequency = boot_cpu_frequency;
284    p->memctrl = memctrl;
285    p->physmem = physmem;
286    p->kernel_path = kernel;
287    p->console_path = console;
288    p->palcode = pal;
289    p->boot_osflags = boot_osflags;
290    p->init_param = init_param;
291    p->readfile = readfile;
292    p->system_type = system_type;
293    p->system_rev = system_rev;
294    p->bin = bin;
295    p->binned_fns = binned_fns;
296    p->bin_int = bin_int;
297    return new LinuxSystem(p);
298}
299
300REGISTER_SIM_OBJECT("LinuxSystem", LinuxSystem)
301
302