system.cc revision 9332 
1/*
2 * Copyright (c) 2010-2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2002-2006 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Ali Saidi
41 */
42
43#include "arch/arm/linux/atag.hh"
44#include "arch/arm/linux/system.hh"
45#include "arch/arm/isa_traits.hh"
46#include "arch/arm/utility.hh"
47#include "arch/generic/linux/threadinfo.hh"
48#include "base/loader/object_file.hh"
49#include "base/loader/symtab.hh"
50#include "cpu/base.hh"
51#include "cpu/pc_event.hh"
52#include "cpu/thread_context.hh"
53#include "debug/Loader.hh"
54#include "kern/linux/events.hh"
55#include "mem/fs_translating_port_proxy.hh"
56#include "mem/physical.hh"
57#include "sim/stat_control.hh"
58
59using namespace ArmISA;
60using namespace Linux;
61
62LinuxArmSystem::LinuxArmSystem(Params *p)
63    : ArmSystem(p),
64      enableContextSwitchStatsDump(p->enable_context_switch_stats_dump)
65{
66#ifndef NDEBUG
67    kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
68    if (!kernelPanicEvent)
69        panic("could not find kernel symbol \'panic\'");
70#endif
71
72    // With ARM udelay() is #defined to __udelay
73    Addr addr = 0;
74    if (kernelSymtab->findAddress("__udelay", addr)) {
75        uDelaySkipEvent = new UDelayEvent(&pcEventQueue, "__udelay",
76                fixFuncEventAddr(addr), 1000, 0);
77    } else {
78        panic("couldn't find kernel symbol \'udelay\'");
79    }
80
81    // constant arguments to udelay() have some precomputation done ahead of
82    // time. Constant comes from code.
83    if (kernelSymtab->findAddress("__const_udelay", addr)) {
84        constUDelaySkipEvent = new UDelayEvent(&pcEventQueue, "__const_udelay",
85                fixFuncEventAddr(addr), 1000, 107374);
86    } else {
87        panic("couldn't find kernel symbol \'udelay\'");
88    }
89
90    secDataPtrAddr = 0;
91    secDataAddr = 0;
92    penReleaseAddr = 0;
93    kernelSymtab->findAddress("__secondary_data", secDataPtrAddr);
94    kernelSymtab->findAddress("secondary_data", secDataAddr);
95    kernelSymtab->findAddress("pen_release", penReleaseAddr);
96
97    secDataPtrAddr &= ~ULL(0x7F);
98    secDataAddr &= ~ULL(0x7F);
99    penReleaseAddr &= ~ULL(0x7F);
100}
101
102bool
103LinuxArmSystem::adderBootUncacheable(Addr a)
104{
105    Addr block = a & ~ULL(0x7F);
106    if (block == secDataPtrAddr || block == secDataAddr ||
107            block == penReleaseAddr)
108        return true;
109    return false;
110}
111
112void
113LinuxArmSystem::initState()
114{
115    // Moved from the constructor to here since it relies on the
116    // address map being resolved in the interconnect
117
118    // Call the initialisation of the super class
119    ArmSystem::initState();
120
121    // Load symbols at physical address, we might not want
122    // to do this permanently, for but early bootup work
123    // it is helpful.
124    if (params()->early_kernel_symbols) {
125        kernel->loadGlobalSymbols(kernelSymtab, loadAddrMask);
126        kernel->loadGlobalSymbols(debugSymbolTable, loadAddrMask);
127    }
128
129    // Setup boot data structure
130    Addr addr = 0;
131    // Check if the kernel image has a symbol that tells us it supports
132    // device trees.
133    bool kernel_has_fdt_support =
134        kernelSymtab->findAddress("unflatten_device_tree", addr);
135    bool dtb_file_specified = params()->dtb_filename != "";
136
137    if (kernel_has_fdt_support && dtb_file_specified) {
138        // Kernel supports flattened device tree and dtb file specified.
139        // Using Device Tree Blob to describe system configuration.
140        inform("Loading DTB file: %s\n", params()->dtb_filename);
141
142        ObjectFile *dtb_file = createObjectFile(params()->dtb_filename, true);
143        if (!dtb_file) {
144            fatal("couldn't load DTB file: %s\n", params()->dtb_filename);
145        }
146        dtb_file->setTextBase(params()->atags_addr);
147        dtb_file->loadSections(physProxy);
148        delete dtb_file;
149    } else {
150        // Using ATAGS
151        // Warn if the kernel supports FDT and we haven't specified one
152        if (kernel_has_fdt_support) {
153            assert(!dtb_file_specified);
154            warn("Kernel supports device tree, but no DTB file specified\n");
155        }
156        // Warn if the kernel doesn't support FDT and we have specified one
157        if (dtb_file_specified) {
158            assert(!kernel_has_fdt_support);
159            warn("DTB file specified, but no device tree support in kernel\n");
160        }
161
162        AtagCore ac;
163        ac.flags(1); // read-only
164        ac.pagesize(8192);
165        ac.rootdev(0);
166
167        AddrRangeList atagRanges = physmem.getConfAddrRanges();
168        if (atagRanges.size() != 1) {
169            fatal("Expected a single ATAG memory entry but got %d\n",
170                  atagRanges.size());
171        }
172        AtagMem am;
173        am.memSize(atagRanges.begin()->size());
174        am.memStart(atagRanges.begin()->start);
175
176        AtagCmdline ad;
177        ad.cmdline(params()->boot_osflags);
178
179        DPRINTF(Loader, "boot command line %d bytes: %s\n",
180                ad.size() <<2, params()->boot_osflags.c_str());
181
182        AtagNone an;
183
184        uint32_t size = ac.size() + am.size() + ad.size() + an.size();
185        uint32_t offset = 0;
186        uint8_t *boot_data = new uint8_t[size << 2];
187
188        offset += ac.copyOut(boot_data + offset);
189        offset += am.copyOut(boot_data + offset);
190        offset += ad.copyOut(boot_data + offset);
191        offset += an.copyOut(boot_data + offset);
192
193        DPRINTF(Loader, "Boot atags was %d bytes in total\n", size << 2);
194        DDUMP(Loader, boot_data, size << 2);
195
196        physProxy.writeBlob(params()->atags_addr, boot_data, size << 2);
197
198        delete[] boot_data;
199    }
200
201    for (int i = 0; i < threadContexts.size(); i++) {
202        threadContexts[i]->setIntReg(0, 0);
203        threadContexts[i]->setIntReg(1, params()->machine_type);
204        threadContexts[i]->setIntReg(2, params()->atags_addr);
205    }
206}
207
208LinuxArmSystem::~LinuxArmSystem()
209{
210    if (uDelaySkipEvent)
211        delete uDelaySkipEvent;
212    if (constUDelaySkipEvent)
213        delete constUDelaySkipEvent;
214
215    if (dumpStatsPCEvent)
216        delete dumpStatsPCEvent;
217}
218
219LinuxArmSystem *
220LinuxArmSystemParams::create()
221{
222    return new LinuxArmSystem(this);
223}
224
225void
226LinuxArmSystem::startup()
227{
228    if (enableContextSwitchStatsDump) {
229        dumpStatsPCEvent = addKernelFuncEvent<DumpStatsPCEvent>("__switch_to");
230        if (!dumpStatsPCEvent)
231           panic("dumpStatsPCEvent not created!");
232
233        std::string task_filename = "tasks.txt";
234        taskFile = simout.create(name() + "." + task_filename);
235
236        for (int i = 0; i < _numContexts; i++) {
237            ThreadContext *tc = threadContexts[i];
238            uint32_t pid = tc->getCpuPtr()->getPid();
239            if (pid != Request::invldPid) {
240                mapPid(tc, pid);
241                tc->getCpuPtr()->taskId(taskMap[pid]);
242            }
243        }
244    }
245}
246
247void
248LinuxArmSystem::mapPid(ThreadContext *tc, uint32_t pid)
249{
250    // Create a new unique identifier for this pid
251    std::map<uint32_t, uint32_t>::iterator itr = taskMap.find(pid);
252    if (itr == taskMap.end()) {
253        uint32_t map_size = taskMap.size();
254        if (map_size > ContextSwitchTaskId::MaxNormalTaskId + 1) {
255            warn_once("Error out of identifiers for cache occupancy stats");
256            taskMap[pid] = ContextSwitchTaskId::Unknown;
257        } else {
258            taskMap[pid] = map_size;
259        }
260    }
261}
262
263/** This function is called whenever the the kernel function
264 *  "__switch_to" is called to change running tasks.
265 *
266 *  r0 = task_struct of the previously running process
267 *  r1 = task_info of the previously running process
268 *  r2 = task_info of the next process to run
269 */
270void
271DumpStatsPCEvent::process(ThreadContext *tc)
272{
273    Linux::ThreadInfo ti(tc);
274    Addr task_descriptor = tc->readIntReg(2);
275    uint32_t pid = ti.curTaskPID(task_descriptor);
276    uint32_t tgid = ti.curTaskTGID(task_descriptor);
277    std::string next_task_str = ti.curTaskName(task_descriptor);
278
279    // Streamline treats pid == -1 as the kernel process.
280    // Also pid == 0 implies idle process (except during Linux boot)
281    int32_t mm = ti.curTaskMm(task_descriptor);
282    bool is_kernel = (mm == 0);
283    if (is_kernel && (pid != 0)) {
284        pid = -1;
285        tgid = -1;
286        next_task_str = "kernel";
287    }
288
289    LinuxArmSystem* sys = dynamic_cast<LinuxArmSystem *>(tc->getSystemPtr());
290    if (!sys) {
291        panic("System is not LinuxArmSystem while getting Linux process info!");
292    }
293    std::map<uint32_t, uint32_t>& taskMap = sys->taskMap;
294
295    // Create a new unique identifier for this pid
296    sys->mapPid(tc, pid);
297
298    // Set cpu task id, output process info, and dump stats
299    tc->getCpuPtr()->taskId(taskMap[pid]);
300    tc->getCpuPtr()->setPid(pid);
301
302    std::ostream* taskFile = sys->taskFile;
303
304    // Task file is read by cache occupancy plotting script or
305    // Streamline conversion script.
306    ccprintf(*taskFile,
307             "tick=%lld %d cpu_id=%d next_pid=%d next_tgid=%d next_task=%s\n",
308             curTick(), taskMap[pid], tc->cpuId(), (int) pid, (int) tgid,
309             next_task_str);
310    taskFile->flush();
311
312    // Dump and reset statistics
313    Stats::schedStatEvent(true, true, curTick(), 0);
314}
315
316