system.cc revision 2632:1bb2f91485ea 
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/arguments.hh"
39#include "arch/vtophys.hh"
40#include "arch/alpha/linux/system.hh"
41#include "arch/alpha/linux/threadinfo.hh"
42#include "arch/alpha/system.hh"
43#include "base/loader/symtab.hh"
44#include "cpu/exec_context.hh"
45#include "cpu/base.hh"
46#include "dev/platform.hh"
47#include "kern/linux/printk.hh"
48#include "kern/linux/events.hh"
49#include "mem/physical.hh"
50#include "mem/port.hh"
51#include "sim/builder.hh"
52#include "sim/byteswap.hh"
53
54using namespace std;
55using namespace AlphaISA;
56using namespace Linux;
57
58LinuxAlphaSystem::LinuxAlphaSystem(Params *p)
59    : AlphaSystem(p)
60{
61    Addr addr = 0;
62
63    /**
64     * The symbol swapper_pg_dir marks the beginning of the kernel and
65     * the location of bootloader passed arguments
66     */
67    if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
68        panic("Could not determine start location of kernel");
69    }
70
71    /**
72     * Since we aren't using a bootloader, we have to copy the
73     * kernel arguments directly into the kernel's memory.
74     */
75    virtPort.writeBlob(CommandLine(), (uint8_t*)params()->boot_osflags.c_str(),
76                params()->boot_osflags.length()+1);
77
78    /**
79     * find the address of the est_cycle_freq variable and insert it
80     * so we don't through the lengthly process of trying to
81     * calculated it by using the PIT, RTC, etc.
82     */
83    if (kernelSymtab->findAddress("est_cycle_freq", addr))
84        virtPort.write(addr, (uint64_t)(Clock::Frequency /
85                    p->boot_cpu_frequency));
86
87
88    /**
89     * EV5 only supports 127 ASNs so we are going to tell the kernel that the
90     * paritiuclar EV6 we have only supports 127 asns.
91     * @todo At some point we should change ev5.hh and the palcode to support
92     * 255 ASNs.
93     */
94    if (kernelSymtab->findAddress("dp264_mv", addr))
95        virtPort.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
96    else
97        panic("could not find dp264_mv\n");
98
99#ifndef NDEBUG
100    kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
101    if (!kernelPanicEvent)
102        panic("could not find kernel symbol \'panic\'");
103
104#if 0
105    kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel");
106    if (!kernelDieEvent)
107        panic("could not find kernel symbol \'die_if_kernel\'");
108#endif
109
110#endif
111
112    /**
113     * Any time ide_delay_50ms, calibarte_delay or
114     * determine_cpu_caches is called just skip the
115     * function. Currently determine_cpu_caches only is used put
116     * information in proc, however if that changes in the future we
117     * will have to fill in the cache size variables appropriately.
118     */
119
120    skipIdeDelay50msEvent =
121        addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
122    skipDelayLoopEvent =
123        addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
124    skipCacheProbeEvent =
125        addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
126    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
127    idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
128
129    if (kernelSymtab->findAddress("alpha_switch_to", addr) && DTRACE(Thread)) {
130        printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
131                                               addr + sizeof(MachInst) * 6);
132    } else {
133        printThreadEvent = NULL;
134    }
135
136    if (params()->bin_int) {
137        intStartEvent = addPalFuncEvent<InterruptStartEvent>("sys_int_21");
138        if (!intStartEvent)
139            panic("could not find symbol: sys_int_21\n");
140
141        intEndEvent = addPalFuncEvent<InterruptEndEvent>("rti_to_kern");
142        if (!intEndEvent)
143            panic("could not find symbol: rti_to_kern\n");
144
145        intEndEvent2 = addPalFuncEvent<InterruptEndEvent>("rti_to_user");
146        if (!intEndEvent2)
147            panic("could not find symbol: rti_to_user\n");
148
149        intEndEvent3 = addKernelFuncEvent<InterruptEndEvent>("do_softirq");
150        if (!intEndEvent3)
151            panic("could not find symbol: do_softirq\n");
152    }
153}
154
155LinuxAlphaSystem::~LinuxAlphaSystem()
156{
157#ifndef NDEBUG
158    delete kernelPanicEvent;
159#endif
160    delete skipIdeDelay50msEvent;
161    delete skipDelayLoopEvent;
162    delete skipCacheProbeEvent;
163    delete debugPrintkEvent;
164    delete idleStartEvent;
165    delete printThreadEvent;
166    delete intStartEvent;
167    delete intEndEvent;
168    delete intEndEvent2;
169}
170
171
172void
173LinuxAlphaSystem::setDelayLoop(ExecContext *xc)
174{
175    Addr addr = 0;
176    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
177        Tick cpuFreq = xc->getCpuPtr()->frequency();
178        Tick intrFreq = platform->intrFrequency();
179        xc->getVirtPort(xc)->write(addr,
180                (uint32_t)((cpuFreq / intrFreq) * 0.9988));
181    }
182}
183
184
185void
186LinuxAlphaSystem::SkipDelayLoopEvent::process(ExecContext *xc)
187{
188    SkipFuncEvent::process(xc);
189    // calculate and set loops_per_jiffy
190    ((LinuxAlphaSystem *)xc->getSystemPtr())->setDelayLoop(xc);
191}
192
193void
194LinuxAlphaSystem::PrintThreadInfo::process(ExecContext *xc)
195{
196    Linux::ThreadInfo ti(xc);
197
198    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
199            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
200}
201
202
203BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
204
205    Param<Tick> boot_cpu_frequency;
206    SimObjectParam<PhysicalMemory *> physmem;
207
208    Param<string> kernel;
209    Param<string> console;
210    Param<string> pal;
211
212    Param<string> boot_osflags;
213    Param<string> readfile;
214    Param<unsigned int> init_param;
215
216    Param<uint64_t> system_type;
217    Param<uint64_t> system_rev;
218
219    Param<bool> bin;
220    VectorParam<string> binned_fns;
221    Param<bool> bin_int;
222
223END_DECLARE_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
224
225BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
226
227    INIT_PARAM(boot_cpu_frequency, "Frequency of the boot CPU"),
228    INIT_PARAM(physmem, "phsyical memory"),
229    INIT_PARAM(kernel, "file that contains the kernel code"),
230    INIT_PARAM(console, "file that contains the console code"),
231    INIT_PARAM(pal, "file that contains palcode"),
232    INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot",
233                    "a"),
234    INIT_PARAM_DFLT(readfile, "file to read startup script from", ""),
235    INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
236    INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34),
237    INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10),
238    INIT_PARAM_DFLT(bin, "is this system to be binned", false),
239    INIT_PARAM(binned_fns, "functions to be broken down and binned"),
240    INIT_PARAM_DFLT(bin_int, "is interrupt code binned seperately?", true)
241
242END_INIT_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
243
244CREATE_SIM_OBJECT(LinuxAlphaSystem)
245{
246    AlphaSystem::Params *p = new AlphaSystem::Params;
247    p->name = getInstanceName();
248    p->boot_cpu_frequency = boot_cpu_frequency;
249    p->physmem = physmem;
250    p->kernel_path = kernel;
251    p->console_path = console;
252    p->palcode = pal;
253    p->boot_osflags = boot_osflags;
254    p->init_param = init_param;
255    p->readfile = readfile;
256    p->system_type = system_type;
257    p->system_rev = system_rev;
258    p->bin = bin;
259    p->binned_fns = binned_fns;
260    p->bin_int = bin_int;
261    return new LinuxAlphaSystem(p);
262}
263
264REGISTER_SIM_OBJECT("LinuxAlphaSystem", LinuxAlphaSystem)
265
266