system.cc revision 2343 
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/functional/memory_control.hh"
50#include "mem/functional/physical.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    Addr paddr = 0;
63
64    /**
65     * The symbol swapper_pg_dir marks the beginning of the kernel and
66     * the location of bootloader passed arguments
67     */
68    if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
69        panic("Could not determine start location of kernel");
70    }
71
72    /**
73     * Since we aren't using a bootloader, we have to copy the
74     * kernel arguments directly into the kernel's memory.
75     */
76    paddr = vtophys(physmem, CommandLine());
77    char *commandline = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
78    if (commandline)
79        strncpy(commandline, params()->boot_osflags.c_str(), CommandLineSize);
80
81    /**
82     * find the address of the est_cycle_freq variable and insert it
83     * so we don't through the lengthly process of trying to
84     * calculated it by using the PIT, RTC, etc.
85     */
86    if (kernelSymtab->findAddress("est_cycle_freq", addr)) {
87        paddr = vtophys(physmem, addr);
88        uint8_t *est_cycle_frequency =
89            physmem->dma_addr(paddr, sizeof(uint64_t));
90
91        if (est_cycle_frequency)
92            *(uint64_t *)est_cycle_frequency =
93                Clock::Frequency / p->boot_cpu_frequency;
94    }
95
96
97    /**
98     * EV5 only supports 127 ASNs so we are going to tell the kernel that the
99     * paritiuclar EV6 we have only supports 127 asns.
100     * @todo At some point we should change ev5.hh and the palcode to support
101     * 255 ASNs.
102     */
103    if (kernelSymtab->findAddress("dp264_mv", addr)) {
104        paddr = vtophys(physmem, addr);
105        char *dp264_mv = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
106
107        if (dp264_mv) {
108            *(uint32_t*)(dp264_mv+0x18) = LittleEndianGuest::htog((uint32_t)127);
109        } else
110            panic("could not translate dp264_mv addr\n");
111
112    } else
113        panic("could not find dp264_mv\n");
114
115#ifndef NDEBUG
116    kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
117    if (!kernelPanicEvent)
118        panic("could not find kernel symbol \'panic\'");
119
120#if 0
121    kernelDieEvent = addKernelFuncEvent<BreakPCEvent>("die_if_kernel");
122    if (!kernelDieEvent)
123        panic("could not find kernel symbol \'die_if_kernel\'");
124#endif
125
126#endif
127
128    /**
129     * Any time ide_delay_50ms, calibarte_delay or
130     * determine_cpu_caches is called just skip the
131     * function. Currently determine_cpu_caches only is used put
132     * information in proc, however if that changes in the future we
133     * will have to fill in the cache size variables appropriately.
134     */
135
136    skipIdeDelay50msEvent =
137        addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
138    skipDelayLoopEvent =
139        addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
140    skipCacheProbeEvent =
141        addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
142    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
143    idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
144
145    if (kernelSymtab->findAddress("alpha_switch_to", addr) && DTRACE(Thread)) {
146        printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
147                                               addr + sizeof(MachInst) * 6);
148    } else {
149        printThreadEvent = NULL;
150    }
151}
152
153LinuxAlphaSystem::~LinuxAlphaSystem()
154{
155#ifndef NDEBUG
156    delete kernelPanicEvent;
157#endif
158    delete skipIdeDelay50msEvent;
159    delete skipDelayLoopEvent;
160    delete skipCacheProbeEvent;
161    delete debugPrintkEvent;
162    delete idleStartEvent;
163    delete printThreadEvent;
164    delete intStartEvent;
165    delete intEndEvent;
166    delete intEndEvent2;
167}
168
169
170void
171LinuxAlphaSystem::setDelayLoop(ExecContext *xc)
172{
173    Addr addr = 0;
174    if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
175        Addr paddr = vtophys(physmem, addr);
176
177        uint8_t *loops_per_jiffy =
178            physmem->dma_addr(paddr, sizeof(uint32_t));
179
180        Tick cpuFreq = xc->getCpuPtr()->frequency();
181        Tick intrFreq = platform->intrFrequency();
182        *(uint32_t *)loops_per_jiffy =
183            (uint32_t)((cpuFreq / intrFreq) * 0.9988);
184    }
185}
186
187
188void
189LinuxAlphaSystem::SkipDelayLoopEvent::process(ExecContext *xc)
190{
191    SkipFuncEvent::process(xc);
192    // calculate and set loops_per_jiffy
193    ((LinuxAlphaSystem *)xc->getSystemPtr())->setDelayLoop(xc);
194}
195
196void
197LinuxAlphaSystem::PrintThreadInfo::process(ExecContext *xc)
198{
199    Linux::ThreadInfo ti(xc);
200
201    DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
202            ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
203}
204
205
206BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
207
208    Param<Tick> boot_cpu_frequency;
209    SimObjectParam<MemoryController *> memctrl;
210    SimObjectParam<PhysicalMemory *> physmem;
211
212    Param<string> kernel;
213    Param<string> console;
214    Param<string> pal;
215
216    Param<string> boot_osflags;
217    Param<string> readfile;
218    Param<unsigned int> init_param;
219
220    Param<uint64_t> system_type;
221    Param<uint64_t> system_rev;
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(memctrl, "memory controller"),
229    INIT_PARAM(physmem, "phsyical memory"),
230    INIT_PARAM(kernel, "file that contains the kernel code"),
231    INIT_PARAM(console, "file that contains the console code"),
232    INIT_PARAM(pal, "file that contains palcode"),
233    INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot",
234                    "a"),
235    INIT_PARAM_DFLT(readfile, "file to read startup script from", ""),
236    INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
237    INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34),
238    INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10)
239
240END_INIT_SIM_OBJECT_PARAMS(LinuxAlphaSystem)
241
242CREATE_SIM_OBJECT(LinuxAlphaSystem)
243{
244    AlphaSystem::Params *p = new AlphaSystem::Params;
245    p->name = getInstanceName();
246    p->boot_cpu_frequency = boot_cpu_frequency;
247    p->memctrl = memctrl;
248    p->physmem = physmem;
249    p->kernel_path = kernel;
250    p->console_path = console;
251    p->palcode = pal;
252    p->boot_osflags = boot_osflags;
253    p->init_param = init_param;
254    p->readfile = readfile;
255    p->system_type = system_type;
256    p->system_rev = system_rev;
257    return new LinuxAlphaSystem(p);
258}
259
260REGISTER_SIM_OBJECT("LinuxAlphaSystem", LinuxAlphaSystem)
261
262