system.cc revision 1070 
1/*
2 * Copyright (c) 2004 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/trace.hh"
39#include "cpu/exec_context.hh"
40#include "cpu/base_cpu.hh"
41#include "kern/linux/linux_events.hh"
42#include "kern/linux/linux_system.hh"
43#include "kern/system_events.hh"
44#include "mem/functional_mem/memory_control.hh"
45#include "mem/functional_mem/physical_memory.hh"
46#include "sim/builder.hh"
47#include "dev/platform.hh"
48#include "targetarch/isa_traits.hh"
49#include "targetarch/vtophys.hh"
50#include "sim/debug.hh"
51
52extern SymbolTable *debugSymbolTable;
53
54using namespace std;
55
56LinuxSystem::LinuxSystem(Params *p)
57    : System(p)
58{
59    Addr addr = 0;
60
61    /**
62     * find the address of the est_cycle_freq variable and insert it
63     * so we don't through the lengthly process of trying to
64     * calculated it by using the PIT, RTC, etc.
65     */
66    if (kernelSymtab->findAddress("est_cycle_freq", addr)) {
67        Addr paddr = vtophys(physmem, addr);
68        uint8_t *est_cycle_frequency =
69            physmem->dma_addr(paddr, sizeof(uint64_t));
70
71        if (est_cycle_frequency)
72            *(uint64_t *)est_cycle_frequency = htoa(ticksPerSecond);
73    }
74
75
76    /**
77     * Since we aren't using a bootloader, we have to copy the kernel arguments
78     * directly into the kernels memory.
79     */
80    {
81        Addr paddr = vtophys(physmem, PARAM_ADDR);
82        char *commandline = (char*)physmem->dma_addr(paddr, sizeof(uint64_t));
83        if (commandline)
84            strcpy(commandline, params->boot_osflags.c_str());
85    }
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        Addr paddr = vtophys(physmem, addr);
96        char *dp264_mv = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
97
98        if (dp264_mv) {
99            *(uint32_t*)(dp264_mv+0x18) = htoa((uint32_t)127);
100        } else
101            panic("could not translate dp264_mv addr\n");
102
103    } else
104        panic("could not find dp264_mv\n");
105
106#ifdef DEBUG
107    kernelPanicEvent = new BreakPCEvent(&pcEventQueue, "kernel panic");
108    if (kernelSymtab->findAddress("panic", addr))
109        kernelPanicEvent->schedule(addr);
110    else
111        panic("could not find kernel symbol \'panic\'");
112#endif
113
114    /**
115     * Any time ide_delay_50ms, calibarte_delay or
116     * determine_cpu_caches is called just skip the
117     * function. Currently determine_cpu_caches only is used put
118     * information in proc, however if that changes in the future we
119     * will have to fill in the cache size variables appropriately.
120     */
121    skipIdeDelay50msEvent = new SkipFuncEvent(&pcEventQueue, "ide_delay_50ms");
122    if (kernelSymtab->findAddress("ide_delay_50ms", addr))
123        skipIdeDelay50msEvent->schedule(addr+sizeof(MachInst));
124
125    skipDelayLoopEvent = new LinuxSkipDelayLoopEvent(&pcEventQueue,
126                                                     "calibrate_delay");
127    if (kernelSymtab->findAddress("calibrate_delay", addr))
128        skipDelayLoopEvent->schedule(addr+sizeof(MachInst));
129
130    skipCacheProbeEvent = new SkipFuncEvent(&pcEventQueue,
131                                            "determine_cpu_caches");
132    if (kernelSymtab->findAddress("determine_cpu_caches", addr))
133        skipCacheProbeEvent->schedule(addr+sizeof(MachInst));
134
135    debugPrintkEvent = new DebugPrintkEvent(&pcEventQueue, "dprintk");
136    if (kernelSymtab->findAddress("dprintk", addr))
137        debugPrintkEvent->schedule(addr+8);
138
139    idleStartEvent = new IdleStartEvent(&pcEventQueue, "cpu_idle", this);
140    if (kernelSymtab->findAddress("cpu_idle", addr))
141        idleStartEvent->schedule(addr);
142
143    printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo");
144    if (kernelSymtab->findAddress("alpha_switch_to", addr) && DTRACE(Thread))
145        printThreadEvent->schedule(addr + sizeof(MachInst) * 6);
146}
147
148LinuxSystem::~LinuxSystem()
149{
150#ifdef DEBUG
151    delete kernelPanicEvent;
152#endif
153    delete skipIdeDelay50msEvent;
154    delete skipDelayLoopEvent;
155    delete skipCacheProbeEvent;
156    delete debugPrintkEvent;
157    delete idleStartEvent;
158}
159
160
161void
162LinuxSystem::setDelayLoop(ExecContext *xc)
163{
164    Addr addr = 0;
165    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
166        Addr paddr = vtophys(physmem, addr);
167
168        uint8_t *loops_per_jiffy =
169            physmem->dma_addr(paddr, sizeof(uint32_t));
170
171        Tick cpuFreq = xc->cpu->getFreq();
172        Tick intrFreq = platform->interrupt_frequency;
173        *(uint32_t *)loops_per_jiffy =
174            (uint32_t)((cpuFreq / intrFreq) * 0.9988);
175    }
176}
177
178BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
179
180    SimObjectParam<MemoryController *> mem_ctl;
181    SimObjectParam<PhysicalMemory *> physmem;
182
183    Param<string> kernel_code;
184    Param<string> console_code;
185    Param<string> pal_code;
186
187    Param<string> boot_osflags;
188    Param<string> readfile;
189    Param<unsigned int> init_param;
190
191    Param<uint64_t> system_type;
192    Param<uint64_t> system_rev;
193
194    Param<bool> bin;
195    VectorParam<string> binned_fns;
196
197END_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
198
199BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
200
201    INIT_PARAM(mem_ctl, "memory controller"),
202    INIT_PARAM(physmem, "phsyical memory"),
203    INIT_PARAM(kernel_code, "file that contains the kernel code"),
204    INIT_PARAM(console_code, "file that contains the console code"),
205    INIT_PARAM(pal_code, "file that contains palcode"),
206    INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot",
207                    "a"),
208    INIT_PARAM_DFLT(readfile, "file to read startup script from", ""),
209    INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
210    INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34),
211    INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10),
212    INIT_PARAM_DFLT(bin, "is this system to be binned", false),
213    INIT_PARAM(binned_fns, "functions to be broken down and binned")
214
215END_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
216
217CREATE_SIM_OBJECT(LinuxSystem)
218{
219    System::Params *p = new System::Params;
220    p->name = getInstanceName();
221    p->memctrl = mem_ctl;
222    p->physmem = physmem;
223    p->kernel_path = kernel_code;
224    p->console_path = console_code;
225    p->palcode = pal_code;
226    p->boot_osflags = boot_osflags;
227    p->init_param = init_param;
228    p->readfile = readfile;
229    p->system_type = system_type;
230    p->system_rev = system_rev;
231    p->bin = bin;
232    p->binned_fns = binned_fns;
233
234    return new LinuxSystem(p);
235}
236
237REGISTER_SIM_OBJECT("LinuxSystem", LinuxSystem)
238
239