26dbef0cde100e305c68da86e704f7e215f10fc2
2 * Copyright (c) 2001-2005 The Regents of The University of Michigan
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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29 #include <sys/types.h>
40 #include "base/misc.hh"
41 #include "config/full_system.hh"
42 #include "mem/packet_impl.hh"
43 #include "mem/physical.hh"
44 #include "sim/host.hh"
45 #include "sim/builder.hh"
46 #include "sim/eventq.hh"
47 #include "arch/isa_traits.hh"
51 using namespace TheISA
;
53 PhysicalMemory::MemResponseEvent::MemResponseEvent(Packet
*pkt
, MemoryPort
* _m
)
54 : Event(&mainEventQueue
, CPU_Tick_Pri
), pkt(pkt
), memoryPort(_m
)
57 this->setFlags(AutoDelete
);
61 PhysicalMemory::MemResponseEvent::process()
63 memoryPort
->sendTiming(pkt
);
67 PhysicalMemory::MemResponseEvent::description()
69 return "Physical Memory Timing Access respnse event";
72 PhysicalMemory::PhysicalMemory(const string
&n
, Tick latency
)
73 : MemObject(n
),base_addr(0), pmem_addr(NULL
), port(NULL
), lat(latency
)
75 // Hardcoded to 128 MB for now.
78 if (pmem_size
% TheISA::PageBytes
!= 0)
79 panic("Memory Size not divisible by page size\n");
81 int map_flags
= MAP_ANON
| MAP_PRIVATE
;
82 pmem_addr
= (uint8_t *)mmap(NULL
, pmem_size
, PROT_READ
| PROT_WRITE
,
85 if (pmem_addr
== (void *)MAP_FAILED
) {
87 fatal("Could not mmap!\n");
94 PhysicalMemory::init()
97 panic("PhysicalMemory not connected to anything!");
98 port
->sendStatusChange(Port::RangeChange
);
101 PhysicalMemory::~PhysicalMemory()
104 munmap(pmem_addr
, pmem_size
);
109 PhysicalMemory::new_page()
111 Addr return_addr
= page_ptr
<< LogVMPageSize
;
112 return_addr
+= base_addr
;
119 PhysicalMemory::deviceBlockSize()
121 //Can accept anysize request
126 PhysicalMemory::doTimingAccess (Packet
*pkt
, MemoryPort
* memoryPort
)
128 doFunctionalAccess(pkt
);
130 // turn packet around to go back to requester
131 pkt
->makeTimingResponse();
132 MemResponseEvent
* response
= new MemResponseEvent(pkt
, memoryPort
);
133 response
->schedule(curTick
+ lat
);
139 PhysicalMemory::doAtomicAccess(Packet
*pkt
)
141 doFunctionalAccess(pkt
);
142 pkt
->time
= curTick
+ lat
;
143 return curTick
+ lat
;
147 PhysicalMemory::doFunctionalAccess(Packet
*pkt
)
149 assert(pkt
->getAddr() + pkt
->getSize() < pmem_size
);
152 case Packet::ReadReq
:
153 memcpy(pkt
->getPtr
<uint8_t>(),
154 pmem_addr
+ pkt
->getAddr() - base_addr
,
157 case Packet::WriteReq
:
158 memcpy(pmem_addr
+ pkt
->getAddr() - base_addr
,
159 pkt
->getPtr
<uint8_t>(),
161 // temporary hack: will need to add real LL/SC implementation
162 // for cacheless systems later.
163 if (pkt
->req
->getFlags() & LOCKED
) {
164 pkt
->req
->setScResult(1);
168 panic("unimplemented");
171 pkt
->result
= Packet::Success
;
175 PhysicalMemory::getPort(const std::string
&if_name
)
179 panic("PhysicalMemory::getPort: additional port requested to memory!");
180 port
= new MemoryPort(name() + "-port", this);
182 } else if (if_name
== "functional") {
183 /* special port for functional writes at startup. */
184 return new MemoryPort(name() + "-funcport", this);
186 panic("PhysicalMemory::getPort: unknown port %s requested", if_name
);
191 PhysicalMemory::recvStatusChange(Port::Status status
)
195 PhysicalMemory::MemoryPort::MemoryPort(const std::string
&_name
,
196 PhysicalMemory
*_memory
)
197 : Port(_name
), memory(_memory
)
201 PhysicalMemory::MemoryPort::recvStatusChange(Port::Status status
)
203 memory
->recvStatusChange(status
);
207 PhysicalMemory::MemoryPort::getDeviceAddressRanges(AddrRangeList
&resp
,
208 AddrRangeList
&snoop
)
210 memory
->getAddressRanges(resp
, snoop
);
214 PhysicalMemory::getAddressRanges(AddrRangeList
&resp
, AddrRangeList
&snoop
)
218 resp
.push_back(RangeSize(base_addr
, pmem_size
));
222 PhysicalMemory::MemoryPort::deviceBlockSize()
224 return memory
->deviceBlockSize();
228 PhysicalMemory::MemoryPort::recvTiming(Packet
*pkt
)
230 return memory
->doTimingAccess(pkt
, this);
234 PhysicalMemory::MemoryPort::recvAtomic(Packet
*pkt
)
236 return memory
->doAtomicAccess(pkt
);
240 PhysicalMemory::MemoryPort::recvFunctional(Packet
*pkt
)
242 memory
->doFunctionalAccess(pkt
);
248 PhysicalMemory::serialize(ostream
&os
)
250 gzFile compressedMem
;
251 string filename
= name() + ".physmem";
253 SERIALIZE_SCALAR(pmem_size
);
254 SERIALIZE_SCALAR(filename
);
257 string thefile
= Checkpoint::dir() + "/" + filename
.c_str();
258 int fd
= creat(thefile
.c_str(), 0664);
261 fatal("Can't open physical memory checkpoint file '%s'\n", filename
);
264 compressedMem
= gzdopen(fd
, "wb");
265 if (compressedMem
== NULL
)
266 fatal("Insufficient memory to allocate compression state for %s\n",
269 if (gzwrite(compressedMem
, pmem_addr
, pmem_size
) != pmem_size
) {
270 fatal("Write failed on physical memory checkpoint file '%s'\n",
274 if (gzclose(compressedMem
))
275 fatal("Close failed on physical memory checkpoint file '%s'\n",
280 PhysicalMemory::unserialize(Checkpoint
*cp
, const string
§ion
)
282 gzFile compressedMem
;
287 const int chunkSize
= 16384;
290 // unmap file that was mmaped in the constructor
291 munmap(pmem_addr
, pmem_size
);
295 UNSERIALIZE_SCALAR(pmem_size
);
296 UNSERIALIZE_SCALAR(filename
);
298 filename
= cp
->cptDir
+ "/" + filename
;
301 int fd
= open(filename
.c_str(), O_RDONLY
);
304 fatal("Can't open physical memory checkpoint file '%s'", filename
);
307 compressedMem
= gzdopen(fd
, "rb");
308 if (compressedMem
== NULL
)
309 fatal("Insufficient memory to allocate compression state for %s\n",
313 pmem_addr
= (uint8_t *)mmap(NULL
, pmem_size
, PROT_READ
| PROT_WRITE
,
314 MAP_ANON
| MAP_PRIVATE
, -1, 0);
316 if (pmem_addr
== (void *)MAP_FAILED
) {
318 fatal("Could not mmap physical memory!\n");
322 tempPage
= (long*)malloc(chunkSize
);
323 if (tempPage
== NULL
)
324 fatal("Unable to malloc memory to read file %s\n", filename
);
326 /* Only copy bytes that are non-zero, so we don't give the VM system hell */
327 while (curSize
< pmem_size
) {
328 bytesRead
= gzread(compressedMem
, tempPage
, chunkSize
);
329 if (bytesRead
!= chunkSize
&& bytesRead
!= pmem_size
- curSize
)
330 fatal("Read failed on physical memory checkpoint file '%s'"
331 " got %d bytes, expected %d or %d bytes\n",
332 filename
, bytesRead
, chunkSize
, pmem_size
-curSize
);
334 assert(bytesRead
% sizeof(long) == 0);
336 for (int x
= 0; x
< bytesRead
/sizeof(long); x
++)
338 if (*(tempPage
+x
) != 0) {
339 pmem_current
= (long*)(pmem_addr
+ curSize
+ x
* sizeof(long));
340 *pmem_current
= *(tempPage
+x
);
343 curSize
+= bytesRead
;
348 if (gzclose(compressedMem
))
349 fatal("Close failed on physical memory checkpoint file '%s'\n",
355 BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory
)
358 Param
<Range
<Addr
> > range
;
361 END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory
)
363 BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory
)
365 INIT_PARAM_DFLT(file
, "memory mapped file", ""),
366 INIT_PARAM(range
, "Device Address Range"),
367 INIT_PARAM(latency
, "Memory access latency")
369 END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory
)
371 CREATE_SIM_OBJECT(PhysicalMemory
)
374 return new PhysicalMemory(getInstanceName(), latency
);
377 REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory
)