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43 #include "arch/arm/linux/system.hh"
45 #include "arch/arm/isa_traits.hh"
46 #include "arch/arm/linux/atag.hh"
47 #include "arch/arm/utility.hh"
48 #include "arch/generic/linux/threadinfo.hh"
49 #include "base/loader/dtb_file.hh"
50 #include "base/loader/object_file.hh"
51 #include "base/loader/symtab.hh"
52 #include "cpu/base.hh"
53 #include "cpu/pc_event.hh"
54 #include "cpu/thread_context.hh"
55 #include "debug/Loader.hh"
56 #include "kern/linux/events.hh"
57 #include "kern/linux/helpers.hh"
58 #include "mem/fs_translating_port_proxy.hh"
59 #include "mem/physical.hh"
60 #include "sim/stat_control.hh"
62 using namespace ArmISA
;
63 using namespace Linux
;
65 LinuxArmSystem::LinuxArmSystem(Params
*p
)
66 : GenericArmSystem(p
), dumpStatsPCEvent(nullptr),
67 enableContextSwitchStatsDump(p
->enable_context_switch_stats_dump
),
68 taskFile(nullptr), kernelPanicEvent(nullptr), kernelOopsEvent(nullptr)
70 const std::string dmesg_output
= name() + ".dmesg";
71 if (p
->panic_on_panic
) {
72 kernelPanicEvent
= addKernelFuncEventOrPanic
<Linux::KernelPanicEvent
>(
73 "panic", "Kernel panic in simulated kernel", dmesg_output
);
75 kernelPanicEvent
= addKernelFuncEventOrPanic
<Linux::DmesgDumpEvent
>(
76 "panic", "Kernel panic in simulated kernel", dmesg_output
);
79 if (p
->panic_on_oops
) {
80 kernelOopsEvent
= addKernelFuncEventOrPanic
<Linux::KernelPanicEvent
>(
81 "oops_exit", "Kernel oops in guest", dmesg_output
);
83 kernelOopsEvent
= addKernelFuncEventOrPanic
<Linux::DmesgDumpEvent
>(
84 "oops_exit", "Kernel oops in guest", dmesg_output
);
87 // With ARM udelay() is #defined to __udelay
88 // newer kernels use __loop_udelay and __loop_const_udelay symbols
89 uDelaySkipEvent
= addKernelFuncEvent
<UDelayEvent
>(
90 "__loop_udelay", "__udelay", 1000, 0);
92 uDelaySkipEvent
= addKernelFuncEventOrPanic
<UDelayEvent
>(
93 "__udelay", "__udelay", 1000, 0);
95 // constant arguments to udelay() have some precomputation done ahead of
96 // time. Constant comes from code.
97 constUDelaySkipEvent
= addKernelFuncEvent
<UDelayEvent
>(
98 "__loop_const_udelay", "__const_udelay", 1000, 107374);
99 if (!constUDelaySkipEvent
)
100 constUDelaySkipEvent
= addKernelFuncEventOrPanic
<UDelayEvent
>(
101 "__const_udelay", "__const_udelay", 1000, 107374);
106 LinuxArmSystem::initState()
108 // Moved from the constructor to here since it relies on the
109 // address map being resolved in the interconnect
111 // Call the initialisation of the super class
112 GenericArmSystem::initState();
114 // Load symbols at physical address, we might not want
115 // to do this permanently, for but early bootup work
117 if (params()->early_kernel_symbols
) {
118 kernel
->loadGlobalSymbols(kernelSymtab
, 0, 0, loadAddrMask
);
119 kernel
->loadGlobalSymbols(debugSymbolTable
, 0, 0, loadAddrMask
);
122 // Setup boot data structure
124 // Check if the kernel image has a symbol that tells us it supports
126 bool kernel_has_fdt_support
=
127 kernelSymtab
->findAddress("unflatten_device_tree", addr
);
128 bool dtb_file_specified
= params()->dtb_filename
!= "";
130 if (kernel_has_fdt_support
&& dtb_file_specified
) {
131 // Kernel supports flattened device tree and dtb file specified.
132 // Using Device Tree Blob to describe system configuration.
133 inform("Loading DTB file: %s at address %#x\n", params()->dtb_filename
,
134 params()->atags_addr
+ loadAddrOffset
);
136 DtbFile
*dtb_file
= new DtbFile(params()->dtb_filename
);
138 if (!dtb_file
->addBootCmdLine(params()->boot_osflags
.c_str(),
139 params()->boot_osflags
.size())) {
140 warn("couldn't append bootargs to DTB file: %s\n",
141 params()->dtb_filename
);
144 dtb_file
->buildImage().
145 offset(params()->atags_addr
+ loadAddrOffset
).write(physProxy
);
149 // Warn if the kernel supports FDT and we haven't specified one
150 if (kernel_has_fdt_support
) {
151 assert(!dtb_file_specified
);
152 warn("Kernel supports device tree, but no DTB file specified\n");
154 // Warn if the kernel doesn't support FDT and we have specified one
155 if (dtb_file_specified
) {
156 assert(!kernel_has_fdt_support
);
157 warn("DTB file specified, but no device tree support in kernel\n");
161 ac
.flags(1); // read-only
165 AddrRangeList atagRanges
= physmem
.getConfAddrRanges();
166 if (atagRanges
.size() != 1) {
167 fatal("Expected a single ATAG memory entry but got %d\n",
171 am
.memSize(atagRanges
.begin()->size());
172 am
.memStart(atagRanges
.begin()->start());
175 ad
.cmdline(params()->boot_osflags
);
177 DPRINTF(Loader
, "boot command line %d bytes: %s\n",
178 ad
.size() <<2, params()->boot_osflags
.c_str());
182 uint32_t size
= ac
.size() + am
.size() + ad
.size() + an
.size();
184 uint8_t *boot_data
= new uint8_t[size
<< 2];
186 offset
+= ac
.copyOut(boot_data
+ offset
);
187 offset
+= am
.copyOut(boot_data
+ offset
);
188 offset
+= ad
.copyOut(boot_data
+ offset
);
189 offset
+= an
.copyOut(boot_data
+ offset
);
191 DPRINTF(Loader
, "Boot atags was %d bytes in total\n", size
<< 2);
192 DDUMP(Loader
, boot_data
, size
<< 2);
194 physProxy
.writeBlob(params()->atags_addr
+ loadAddrOffset
, boot_data
,
200 // Kernel boot requirements to set up r0, r1 and r2 in ARMv7
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
+ loadAddrOffset
);
208 LinuxArmSystem::~LinuxArmSystem()
211 delete uDelaySkipEvent
;
212 if (constUDelaySkipEvent
)
213 delete constUDelaySkipEvent
;
215 if (dumpStatsPCEvent
)
216 delete dumpStatsPCEvent
;
220 LinuxArmSystemParams::create()
222 return new LinuxArmSystem(this);
226 LinuxArmSystem::startup()
228 if (enableContextSwitchStatsDump
) {
229 if (!highestELIs64()) {
231 addKernelFuncEvent
<DumpStatsPCEvent
>("__switch_to");
234 addKernelFuncEvent
<DumpStatsPCEvent64
>("__switch_to");
237 if (!dumpStatsPCEvent
)
238 panic("dumpStatsPCEvent not created!");
240 std::string task_filename
= "tasks.txt";
241 taskFile
= simout
.create(name() + "." + task_filename
);
243 for (const auto tc
: threadContexts
) {
244 uint32_t pid
= tc
->getCpuPtr()->getPid();
245 if (pid
!= BaseCPU::invldPid
) {
247 tc
->getCpuPtr()->taskId(taskMap
[pid
]);
254 LinuxArmSystem::mapPid(ThreadContext
*tc
, uint32_t pid
)
256 // Create a new unique identifier for this pid
257 std::map
<uint32_t, uint32_t>::iterator itr
= taskMap
.find(pid
);
258 if (itr
== taskMap
.end()) {
259 uint32_t map_size
= taskMap
.size();
260 if (map_size
> ContextSwitchTaskId::MaxNormalTaskId
+ 1) {
261 warn_once("Error out of identifiers for cache occupancy stats");
262 taskMap
[pid
] = ContextSwitchTaskId::Unknown
;
264 taskMap
[pid
] = map_size
;
270 LinuxArmSystem::dumpDmesg()
272 Linux::dumpDmesg(getThreadContext(0), std::cout
);
276 * Extracts the information used by the DumpStatsPCEvent by reading the
277 * thread_info pointer passed to __switch_to() in 32 bit ARM Linux
279 * r0 = task_struct of the previously running process
280 * r1 = thread_info of the previously running process
281 * r2 = thread_info of the next process to run
284 DumpStatsPCEvent::getTaskDetails(ThreadContext
*tc
, uint32_t &pid
,
285 uint32_t &tgid
, std::string
&next_task_str
, int32_t &mm
) {
287 Linux::ThreadInfo
ti(tc
);
288 Addr task_descriptor
= tc
->readIntReg(2);
289 pid
= ti
.curTaskPID(task_descriptor
);
290 tgid
= ti
.curTaskTGID(task_descriptor
);
291 next_task_str
= ti
.curTaskName(task_descriptor
);
293 // Streamline treats pid == -1 as the kernel process.
294 // Also pid == 0 implies idle process (except during Linux boot)
295 mm
= ti
.curTaskMm(task_descriptor
);
299 * Extracts the information used by the DumpStatsPCEvent64 by reading the
300 * task_struct pointer passed to __switch_to() in 64 bit ARM Linux
302 * r0 = task_struct of the previously running process
303 * r1 = task_struct of next process to run
306 DumpStatsPCEvent64::getTaskDetails(ThreadContext
*tc
, uint32_t &pid
,
307 uint32_t &tgid
, std::string
&next_task_str
, int32_t &mm
) {
309 Linux::ThreadInfo
ti(tc
);
310 Addr task_struct
= tc
->readIntReg(1);
311 pid
= ti
.curTaskPIDFromTaskStruct(task_struct
);
312 tgid
= ti
.curTaskTGIDFromTaskStruct(task_struct
);
313 next_task_str
= ti
.curTaskNameFromTaskStruct(task_struct
);
315 // Streamline treats pid == -1 as the kernel process.
316 // Also pid == 0 implies idle process (except during Linux boot)
317 mm
= ti
.curTaskMmFromTaskStruct(task_struct
);
320 /** This function is called whenever the the kernel function
321 * "__switch_to" is called to change running tasks.
324 DumpStatsPCEvent::process(ThreadContext
*tc
)
328 std::string next_task_str
;
331 getTaskDetails(tc
, pid
, tgid
, next_task_str
, mm
);
333 bool is_kernel
= (mm
== 0);
334 if (is_kernel
&& (pid
!= 0)) {
337 next_task_str
= "kernel";
340 LinuxArmSystem
* sys
= dynamic_cast<LinuxArmSystem
*>(tc
->getSystemPtr());
342 panic("System is not LinuxArmSystem while getting Linux process info!");
344 std::map
<uint32_t, uint32_t>& taskMap
= sys
->taskMap
;
346 // Create a new unique identifier for this pid
347 sys
->mapPid(tc
, pid
);
349 // Set cpu task id, output process info, and dump stats
350 tc
->getCpuPtr()->taskId(taskMap
[pid
]);
351 tc
->getCpuPtr()->setPid(pid
);
353 OutputStream
* taskFile
= sys
->taskFile
;
355 // Task file is read by cache occupancy plotting script or
356 // Streamline conversion script.
357 ccprintf(*(taskFile
->stream()),
358 "tick=%lld %d cpu_id=%d next_pid=%d next_tgid=%d next_task=%s\n",
359 curTick(), taskMap
[pid
], tc
->cpuId(), (int) pid
, (int) tgid
,
361 taskFile
->stream()->flush();
363 // Dump and reset statistics
364 Stats::schedStatEvent(true, true, curTick(), 0);