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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/dtb_object.hh"
49 #include "base/loader/object_file.hh"
50 #include "base/loader/symtab.hh"
51 #include "cpu/base.hh"
52 #include "cpu/pc_event.hh"
53 #include "cpu/thread_context.hh"
54 #include "debug/Loader.hh"
55 #include "kern/linux/events.hh"
56 #include "mem/fs_translating_port_proxy.hh"
57 #include "mem/physical.hh"
58 #include "sim/stat_control.hh"
60 using namespace ArmISA
;
61 using namespace Linux
;
63 LinuxArmSystem::LinuxArmSystem(Params
*p
)
64 : GenericArmSystem(p
), dumpStatsPCEvent(nullptr),
65 enableContextSwitchStatsDump(p
->enable_context_switch_stats_dump
),
66 taskFile(nullptr), kernelPanicEvent(nullptr), kernelOopsEvent(nullptr)
68 if (p
->panic_on_panic
) {
69 kernelPanicEvent
= addKernelFuncEventOrPanic
<PanicPCEvent
>(
70 "panic", "Kernel panic in simulated kernel");
73 kernelPanicEvent
= addKernelFuncEventOrPanic
<BreakPCEvent
>("panic");
77 if (p
->panic_on_oops
) {
78 kernelOopsEvent
= addKernelFuncEventOrPanic
<PanicPCEvent
>(
79 "oops_exit", "Kernel oops in guest");
82 // With ARM udelay() is #defined to __udelay
83 // newer kernels use __loop_udelay and __loop_const_udelay symbols
84 uDelaySkipEvent
= addKernelFuncEvent
<UDelayEvent
>(
85 "__loop_udelay", "__udelay", 1000, 0);
87 uDelaySkipEvent
= addKernelFuncEventOrPanic
<UDelayEvent
>(
88 "__udelay", "__udelay", 1000, 0);
90 // constant arguments to udelay() have some precomputation done ahead of
91 // time. Constant comes from code.
92 constUDelaySkipEvent
= addKernelFuncEvent
<UDelayEvent
>(
93 "__loop_const_udelay", "__const_udelay", 1000, 107374);
94 if(!constUDelaySkipEvent
)
95 constUDelaySkipEvent
= addKernelFuncEventOrPanic
<UDelayEvent
>(
96 "__const_udelay", "__const_udelay", 1000, 107374);
101 LinuxArmSystem::initState()
103 // Moved from the constructor to here since it relies on the
104 // address map being resolved in the interconnect
106 // Call the initialisation of the super class
107 GenericArmSystem::initState();
109 // Load symbols at physical address, we might not want
110 // to do this permanently, for but early bootup work
112 if (params()->early_kernel_symbols
) {
113 kernel
->loadGlobalSymbols(kernelSymtab
, loadAddrMask
);
114 kernel
->loadGlobalSymbols(debugSymbolTable
, loadAddrMask
);
117 // Setup boot data structure
119 // Check if the kernel image has a symbol that tells us it supports
121 bool kernel_has_fdt_support
=
122 kernelSymtab
->findAddress("unflatten_device_tree", addr
);
123 bool dtb_file_specified
= params()->dtb_filename
!= "";
125 if (kernel_has_fdt_support
&& dtb_file_specified
) {
126 // Kernel supports flattened device tree and dtb file specified.
127 // Using Device Tree Blob to describe system configuration.
128 inform("Loading DTB file: %s at address %#x\n", params()->dtb_filename
,
129 params()->atags_addr
+ loadAddrOffset
);
131 ObjectFile
*dtb_file
= createObjectFile(params()->dtb_filename
, true);
133 fatal("couldn't load DTB file: %s\n", params()->dtb_filename
);
136 DtbObject
*_dtb_file
= dynamic_cast<DtbObject
*>(dtb_file
);
139 if (!_dtb_file
->addBootCmdLine(params()->boot_osflags
.c_str(),
140 params()->boot_osflags
.size())) {
141 warn("couldn't append bootargs to DTB file: %s\n",
142 params()->dtb_filename
);
145 warn("dtb_file cast failed; couldn't append bootargs "
146 "to DTB file: %s\n", params()->dtb_filename
);
149 dtb_file
->setTextBase(params()->atags_addr
+ loadAddrOffset
);
150 dtb_file
->loadSections(physProxy
);
154 // Warn if the kernel supports FDT and we haven't specified one
155 if (kernel_has_fdt_support
) {
156 assert(!dtb_file_specified
);
157 warn("Kernel supports device tree, but no DTB file specified\n");
159 // Warn if the kernel doesn't support FDT and we have specified one
160 if (dtb_file_specified
) {
161 assert(!kernel_has_fdt_support
);
162 warn("DTB file specified, but no device tree support in kernel\n");
166 ac
.flags(1); // read-only
170 AddrRangeList atagRanges
= physmem
.getConfAddrRanges();
171 if (atagRanges
.size() != 1) {
172 fatal("Expected a single ATAG memory entry but got %d\n",
176 am
.memSize(atagRanges
.begin()->size());
177 am
.memStart(atagRanges
.begin()->start());
180 ad
.cmdline(params()->boot_osflags
);
182 DPRINTF(Loader
, "boot command line %d bytes: %s\n",
183 ad
.size() <<2, params()->boot_osflags
.c_str());
187 uint32_t size
= ac
.size() + am
.size() + ad
.size() + an
.size();
189 uint8_t *boot_data
= new uint8_t[size
<< 2];
191 offset
+= ac
.copyOut(boot_data
+ offset
);
192 offset
+= am
.copyOut(boot_data
+ offset
);
193 offset
+= ad
.copyOut(boot_data
+ offset
);
194 offset
+= an
.copyOut(boot_data
+ offset
);
196 DPRINTF(Loader
, "Boot atags was %d bytes in total\n", size
<< 2);
197 DDUMP(Loader
, boot_data
, size
<< 2);
199 physProxy
.writeBlob(params()->atags_addr
+ loadAddrOffset
, boot_data
,
205 // Kernel boot requirements to set up r0, r1 and r2 in ARMv7
206 for (int i
= 0; i
< threadContexts
.size(); i
++) {
207 threadContexts
[i
]->setIntReg(0, 0);
208 threadContexts
[i
]->setIntReg(1, params()->machine_type
);
209 threadContexts
[i
]->setIntReg(2, params()->atags_addr
+ loadAddrOffset
);
213 LinuxArmSystem::~LinuxArmSystem()
216 delete uDelaySkipEvent
;
217 if (constUDelaySkipEvent
)
218 delete constUDelaySkipEvent
;
220 if (dumpStatsPCEvent
)
221 delete dumpStatsPCEvent
;
225 LinuxArmSystemParams::create()
227 return new LinuxArmSystem(this);
231 LinuxArmSystem::startup()
233 if (enableContextSwitchStatsDump
) {
234 dumpStatsPCEvent
= addKernelFuncEvent
<DumpStatsPCEvent
>("__switch_to");
235 if (!dumpStatsPCEvent
)
236 panic("dumpStatsPCEvent not created!");
238 std::string task_filename
= "tasks.txt";
239 taskFile
= simout
.create(name() + "." + task_filename
);
241 for (int i
= 0; i
< _numContexts
; i
++) {
242 ThreadContext
*tc
= threadContexts
[i
];
243 uint32_t pid
= tc
->getCpuPtr()->getPid();
244 if (pid
!= BaseCPU::invldPid
) {
246 tc
->getCpuPtr()->taskId(taskMap
[pid
]);
253 LinuxArmSystem::mapPid(ThreadContext
*tc
, uint32_t pid
)
255 // Create a new unique identifier for this pid
256 std::map
<uint32_t, uint32_t>::iterator itr
= taskMap
.find(pid
);
257 if (itr
== taskMap
.end()) {
258 uint32_t map_size
= taskMap
.size();
259 if (map_size
> ContextSwitchTaskId::MaxNormalTaskId
+ 1) {
260 warn_once("Error out of identifiers for cache occupancy stats");
261 taskMap
[pid
] = ContextSwitchTaskId::Unknown
;
263 taskMap
[pid
] = map_size
;
268 /** This function is called whenever the the kernel function
269 * "__switch_to" is called to change running tasks.
271 * r0 = task_struct of the previously running process
272 * r1 = task_info of the previously running process
273 * r2 = task_info of the next process to run
276 DumpStatsPCEvent::process(ThreadContext
*tc
)
278 Linux::ThreadInfo
ti(tc
);
279 Addr task_descriptor
= tc
->readIntReg(2);
280 uint32_t pid
= ti
.curTaskPID(task_descriptor
);
281 uint32_t tgid
= ti
.curTaskTGID(task_descriptor
);
282 std::string next_task_str
= ti
.curTaskName(task_descriptor
);
284 // Streamline treats pid == -1 as the kernel process.
285 // Also pid == 0 implies idle process (except during Linux boot)
286 int32_t mm
= ti
.curTaskMm(task_descriptor
);
287 bool is_kernel
= (mm
== 0);
288 if (is_kernel
&& (pid
!= 0)) {
291 next_task_str
= "kernel";
294 LinuxArmSystem
* sys
= dynamic_cast<LinuxArmSystem
*>(tc
->getSystemPtr());
296 panic("System is not LinuxArmSystem while getting Linux process info!");
298 std::map
<uint32_t, uint32_t>& taskMap
= sys
->taskMap
;
300 // Create a new unique identifier for this pid
301 sys
->mapPid(tc
, pid
);
303 // Set cpu task id, output process info, and dump stats
304 tc
->getCpuPtr()->taskId(taskMap
[pid
]);
305 tc
->getCpuPtr()->setPid(pid
);
307 std::ostream
* taskFile
= sys
->taskFile
;
309 // Task file is read by cache occupancy plotting script or
310 // Streamline conversion script.
312 "tick=%lld %d cpu_id=%d next_pid=%d next_tgid=%d next_task=%s\n",
313 curTick(), taskMap
[pid
], tc
->cpuId(), (int) pid
, (int) tgid
,
317 // Dump and reset statistics
318 Stats::schedStatEvent(true, true, curTick(), 0);