abstract_mem.cc revision 2665 
1/*
2 * Copyright (c) 2001-2005 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 * Authors: Ron Dreslinski
29 */
30
31#include <sys/types.h>
32#include <sys/mman.h>
33#include <errno.h>
34#include <fcntl.h>
35#include <unistd.h>
36#include <zlib.h>
37
38#include <iostream>
39#include <string>
40
41
42#include "base/misc.hh"
43#include "config/full_system.hh"
44#include "mem/packet_impl.hh"
45#include "mem/physical.hh"
46#include "sim/host.hh"
47#include "sim/builder.hh"
48#include "sim/eventq.hh"
49#include "arch/isa_traits.hh"
50
51
52using namespace std;
53using namespace TheISA;
54
55PhysicalMemory::MemResponseEvent::MemResponseEvent(Packet *pkt, MemoryPort* _m)
56    : Event(&mainEventQueue, CPU_Tick_Pri), pkt(pkt), memoryPort(_m)
57{
58
59    this->setFlags(AutoDelete);
60}
61
62void
63PhysicalMemory::MemResponseEvent::process()
64{
65    memoryPort->sendTiming(pkt);
66}
67
68const char *
69PhysicalMemory::MemResponseEvent::description()
70{
71    return "Physical Memory Timing Access respnse event";
72}
73
74PhysicalMemory::PhysicalMemory(const string &n, Tick latency)
75    : MemObject(n),base_addr(0), pmem_addr(NULL), port(NULL), lat(latency)
76{
77    // Hardcoded to 128 MB for now.
78    pmem_size = 1 << 27;
79
80    if (pmem_size % TheISA::PageBytes != 0)
81        panic("Memory Size not divisible by page size\n");
82
83    int map_flags = MAP_ANON | MAP_PRIVATE;
84    pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE,
85                                map_flags, -1, 0);
86
87    if (pmem_addr == (void *)MAP_FAILED) {
88        perror("mmap");
89        fatal("Could not mmap!\n");
90    }
91
92    page_ptr = 0;
93}
94
95void
96PhysicalMemory::init()
97{
98    if (!port)
99        panic("PhysicalMemory not connected to anything!");
100    port->sendStatusChange(Port::RangeChange);
101}
102
103PhysicalMemory::~PhysicalMemory()
104{
105    if (pmem_addr)
106        munmap(pmem_addr, pmem_size);
107    //Remove memPorts?
108}
109
110Addr
111PhysicalMemory::new_page()
112{
113    Addr return_addr = page_ptr << LogVMPageSize;
114    return_addr += base_addr;
115
116    ++page_ptr;
117    return return_addr;
118}
119
120int
121PhysicalMemory::deviceBlockSize()
122{
123    //Can accept anysize request
124    return 0;
125}
126
127bool
128PhysicalMemory::doTimingAccess (Packet *pkt, MemoryPort* memoryPort)
129{
130    doFunctionalAccess(pkt);
131
132    // turn packet around to go back to requester
133    pkt->makeTimingResponse();
134    MemResponseEvent* response = new MemResponseEvent(pkt, memoryPort);
135    response->schedule(curTick + lat);
136
137    return true;
138}
139
140Tick
141PhysicalMemory::doAtomicAccess(Packet *pkt)
142{
143    doFunctionalAccess(pkt);
144    return lat;
145}
146
147void
148PhysicalMemory::doFunctionalAccess(Packet *pkt)
149{
150    assert(pkt->getAddr() + pkt->getSize() < pmem_size);
151
152    switch (pkt->cmd) {
153      case Packet::ReadReq:
154        memcpy(pkt->getPtr<uint8_t>(),
155               pmem_addr + pkt->getAddr() - base_addr,
156               pkt->getSize());
157        break;
158      case Packet::WriteReq:
159        memcpy(pmem_addr + pkt->getAddr() - base_addr,
160               pkt->getPtr<uint8_t>(),
161               pkt->getSize());
162        // temporary hack: will need to add real LL/SC implementation
163        // for cacheless systems later.
164        if (pkt->req->getFlags() & LOCKED) {
165            pkt->req->setScResult(1);
166        }
167        break;
168      default:
169        panic("unimplemented");
170    }
171
172    pkt->result = Packet::Success;
173}
174
175Port *
176PhysicalMemory::getPort(const std::string &if_name)
177{
178    if (if_name == "") {
179        if (port != NULL)
180           panic("PhysicalMemory::getPort: additional port requested to memory!");
181        port = new MemoryPort(name() + "-port", this);
182        return port;
183    } else if (if_name == "functional") {
184        /* special port for functional writes at startup. */
185        return new MemoryPort(name() + "-funcport", this);
186    } else {
187        panic("PhysicalMemory::getPort: unknown port %s requested", if_name);
188    }
189}
190
191void
192PhysicalMemory::recvStatusChange(Port::Status status)
193{
194}
195
196PhysicalMemory::MemoryPort::MemoryPort(const std::string &_name,
197                                       PhysicalMemory *_memory)
198    : Port(_name), memory(_memory)
199{ }
200
201void
202PhysicalMemory::MemoryPort::recvStatusChange(Port::Status status)
203{
204    memory->recvStatusChange(status);
205}
206
207void
208PhysicalMemory::MemoryPort::getDeviceAddressRanges(AddrRangeList &resp,
209                                            AddrRangeList &snoop)
210{
211    memory->getAddressRanges(resp, snoop);
212}
213
214void
215PhysicalMemory::getAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
216{
217    snoop.clear();
218    resp.clear();
219    resp.push_back(RangeSize(base_addr, pmem_size));
220}
221
222int
223PhysicalMemory::MemoryPort::deviceBlockSize()
224{
225    return memory->deviceBlockSize();
226}
227
228bool
229PhysicalMemory::MemoryPort::recvTiming(Packet *pkt)
230{
231    return memory->doTimingAccess(pkt, this);
232}
233
234Tick
235PhysicalMemory::MemoryPort::recvAtomic(Packet *pkt)
236{
237    return memory->doAtomicAccess(pkt);
238}
239
240void
241PhysicalMemory::MemoryPort::recvFunctional(Packet *pkt)
242{
243    memory->doFunctionalAccess(pkt);
244}
245
246
247
248void
249PhysicalMemory::serialize(ostream &os)
250{
251    gzFile compressedMem;
252    string filename = name() + ".physmem";
253
254    SERIALIZE_SCALAR(pmem_size);
255    SERIALIZE_SCALAR(filename);
256
257    // write memory file
258    string thefile = Checkpoint::dir() + "/" + filename.c_str();
259    int fd = creat(thefile.c_str(), 0664);
260    if (fd < 0) {
261        perror("creat");
262        fatal("Can't open physical memory checkpoint file '%s'\n", filename);
263    }
264
265    compressedMem = gzdopen(fd, "wb");
266    if (compressedMem == NULL)
267        fatal("Insufficient memory to allocate compression state for %s\n",
268                filename);
269
270    if (gzwrite(compressedMem, pmem_addr, pmem_size) != pmem_size) {
271        fatal("Write failed on physical memory checkpoint file '%s'\n",
272              filename);
273    }
274
275    if (gzclose(compressedMem))
276        fatal("Close failed on physical memory checkpoint file '%s'\n",
277              filename);
278}
279
280void
281PhysicalMemory::unserialize(Checkpoint *cp, const string &section)
282{
283    gzFile compressedMem;
284    long *tempPage;
285    long *pmem_current;
286    uint64_t curSize;
287    uint32_t bytesRead;
288    const int chunkSize = 16384;
289
290
291    // unmap file that was mmaped in the constructor
292    munmap(pmem_addr, pmem_size);
293
294    string filename;
295
296    UNSERIALIZE_SCALAR(pmem_size);
297    UNSERIALIZE_SCALAR(filename);
298
299    filename = cp->cptDir + "/" + filename;
300
301    // mmap memoryfile
302    int fd = open(filename.c_str(), O_RDONLY);
303    if (fd < 0) {
304        perror("open");
305        fatal("Can't open physical memory checkpoint file '%s'", filename);
306    }
307
308    compressedMem = gzdopen(fd, "rb");
309    if (compressedMem == NULL)
310        fatal("Insufficient memory to allocate compression state for %s\n",
311                filename);
312
313
314    pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE,
315                                MAP_ANON | MAP_PRIVATE, -1, 0);
316
317    if (pmem_addr == (void *)MAP_FAILED) {
318        perror("mmap");
319        fatal("Could not mmap physical memory!\n");
320    }
321
322    curSize = 0;
323    tempPage = (long*)malloc(chunkSize);
324    if (tempPage == NULL)
325        fatal("Unable to malloc memory to read file %s\n", filename);
326
327    /* Only copy bytes that are non-zero, so we don't give the VM system hell */
328    while (curSize < pmem_size) {
329        bytesRead = gzread(compressedMem, tempPage, chunkSize);
330        if (bytesRead != chunkSize && bytesRead != pmem_size - curSize)
331            fatal("Read failed on physical memory checkpoint file '%s'"
332                  " got %d bytes, expected %d or %d bytes\n",
333                  filename, bytesRead, chunkSize, pmem_size-curSize);
334
335        assert(bytesRead % sizeof(long) == 0);
336
337        for (int x = 0; x < bytesRead/sizeof(long); x++)
338        {
339             if (*(tempPage+x) != 0) {
340                 pmem_current = (long*)(pmem_addr + curSize + x * sizeof(long));
341                 *pmem_current = *(tempPage+x);
342             }
343        }
344        curSize += bytesRead;
345    }
346
347    free(tempPage);
348
349    if (gzclose(compressedMem))
350        fatal("Close failed on physical memory checkpoint file '%s'\n",
351              filename);
352
353}
354
355
356BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
357
358    Param<string> file;
359    Param<Range<Addr> > range;
360    Param<Tick> latency;
361
362END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
363
364BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
365
366    INIT_PARAM_DFLT(file, "memory mapped file", ""),
367    INIT_PARAM(range, "Device Address Range"),
368    INIT_PARAM(latency, "Memory access latency")
369
370END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
371
372CREATE_SIM_OBJECT(PhysicalMemory)
373{
374
375    return new PhysicalMemory(getInstanceName(), latency);
376}
377
378REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory)
379