backdoor.cc revision 7823:dac01f14f20f 
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: Nathan Binkert
29 *          Ali Saidi
30 *          Steve Reinhardt
31 *          Erik Hallnor
32 */
33
34/** @file
35 * Alpha Console Backdoor Definition
36 */
37
38#include <cstddef>
39#include <string>
40
41#include "arch/alpha/system.hh"
42#include "base/inifile.hh"
43#include "base/str.hh"
44#include "base/trace.hh"
45#include "cpu/base.hh"
46#include "cpu/thread_context.hh"
47#include "dev/alpha/backdoor.hh"
48#include "dev/platform.hh"
49#include "dev/simple_disk.hh"
50#include "dev/terminal.hh"
51#include "mem/packet.hh"
52#include "mem/packet_access.hh"
53#include "mem/physical.hh"
54#include "params/AlphaBackdoor.hh"
55#include "sim/sim_object.hh"
56
57using namespace std;
58using namespace AlphaISA;
59
60AlphaBackdoor::AlphaBackdoor(const Params *p)
61    : BasicPioDevice(p), disk(p->disk), terminal(p->terminal),
62      system(p->system), cpu(p->cpu)
63{
64
65    pioSize = sizeof(struct AlphaAccess);
66
67    alphaAccess = new Access();
68    alphaAccess->last_offset = pioSize - 1;
69
70    alphaAccess->version = ALPHA_ACCESS_VERSION;
71    alphaAccess->diskUnit = 1;
72
73    alphaAccess->diskCount = 0;
74    alphaAccess->diskPAddr = 0;
75    alphaAccess->diskBlock = 0;
76    alphaAccess->diskOperation = 0;
77    alphaAccess->outputChar = 0;
78    alphaAccess->inputChar = 0;
79    std::memset(alphaAccess->cpuStack, 0, sizeof(alphaAccess->cpuStack));
80
81}
82
83void
84AlphaBackdoor::startup()
85{
86    system->setAlphaAccess(pioAddr);
87    alphaAccess->numCPUs = system->numContexts();
88    alphaAccess->kernStart = system->getKernelStart();
89    alphaAccess->kernEnd = system->getKernelEnd();
90    alphaAccess->entryPoint = system->getKernelEntry();
91    alphaAccess->mem_size = system->physmem->size();
92    alphaAccess->cpuClock = cpu->frequency() / 1000000; // In MHz
93    alphaAccess->intrClockFrequency = params()->platform->intrFrequency();
94}
95
96Tick
97AlphaBackdoor::read(PacketPtr pkt)
98{
99
100    /** XXX Do we want to push the addr munging to a bus brige or something? So
101     * the device has it's physical address and then the bridge adds on whatever
102     * machine dependent address swizzle is required?
103     */
104
105    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
106
107    Addr daddr = pkt->getAddr() - pioAddr;
108
109    pkt->allocate();
110    pkt->makeAtomicResponse();
111
112    switch (pkt->getSize())
113    {
114        case sizeof(uint32_t):
115            switch (daddr)
116            {
117                case offsetof(AlphaAccess, last_offset):
118                    pkt->set(alphaAccess->last_offset);
119                    break;
120                case offsetof(AlphaAccess, version):
121                    pkt->set(alphaAccess->version);
122                    break;
123                case offsetof(AlphaAccess, numCPUs):
124                    pkt->set(alphaAccess->numCPUs);
125                    break;
126                case offsetof(AlphaAccess, intrClockFrequency):
127                    pkt->set(alphaAccess->intrClockFrequency);
128                    break;
129                default:
130                    /* Old console code read in everyting as a 32bit int
131                     * we now break that for better error checking.
132                     */
133                  pkt->setBadAddress();
134            }
135            DPRINTF(AlphaBackdoor, "read: offset=%#x val=%#x\n", daddr,
136                    pkt->get<uint32_t>());
137            break;
138        case sizeof(uint64_t):
139            switch (daddr)
140            {
141                case offsetof(AlphaAccess, inputChar):
142                    pkt->set(terminal->console_in());
143                    break;
144                case offsetof(AlphaAccess, cpuClock):
145                    pkt->set(alphaAccess->cpuClock);
146                    break;
147                case offsetof(AlphaAccess, mem_size):
148                    pkt->set(alphaAccess->mem_size);
149                    break;
150                case offsetof(AlphaAccess, kernStart):
151                    pkt->set(alphaAccess->kernStart);
152                    break;
153                case offsetof(AlphaAccess, kernEnd):
154                    pkt->set(alphaAccess->kernEnd);
155                    break;
156                case offsetof(AlphaAccess, entryPoint):
157                    pkt->set(alphaAccess->entryPoint);
158                    break;
159                case offsetof(AlphaAccess, diskUnit):
160                    pkt->set(alphaAccess->diskUnit);
161                    break;
162                case offsetof(AlphaAccess, diskCount):
163                    pkt->set(alphaAccess->diskCount);
164                    break;
165                case offsetof(AlphaAccess, diskPAddr):
166                    pkt->set(alphaAccess->diskPAddr);
167                    break;
168                case offsetof(AlphaAccess, diskBlock):
169                    pkt->set(alphaAccess->diskBlock);
170                    break;
171                case offsetof(AlphaAccess, diskOperation):
172                    pkt->set(alphaAccess->diskOperation);
173                    break;
174                case offsetof(AlphaAccess, outputChar):
175                    pkt->set(alphaAccess->outputChar);
176                    break;
177                default:
178                    int cpunum = (daddr - offsetof(AlphaAccess, cpuStack)) /
179                                 sizeof(alphaAccess->cpuStack[0]);
180
181                    if (cpunum >= 0 && cpunum < 64)
182                        pkt->set(alphaAccess->cpuStack[cpunum]);
183                    else
184                        panic("Unknown 64bit access, %#x\n", daddr);
185            }
186            DPRINTF(AlphaBackdoor, "read: offset=%#x val=%#x\n", daddr,
187                    pkt->get<uint64_t>());
188            break;
189        default:
190          pkt->setBadAddress();
191    }
192    return pioDelay;
193}
194
195Tick
196AlphaBackdoor::write(PacketPtr pkt)
197{
198    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
199    Addr daddr = pkt->getAddr() - pioAddr;
200
201    uint64_t val = pkt->get<uint64_t>();
202    assert(pkt->getSize() == sizeof(uint64_t));
203
204    switch (daddr) {
205      case offsetof(AlphaAccess, diskUnit):
206        alphaAccess->diskUnit = val;
207        break;
208
209      case offsetof(AlphaAccess, diskCount):
210        alphaAccess->diskCount = val;
211        break;
212
213      case offsetof(AlphaAccess, diskPAddr):
214        alphaAccess->diskPAddr = val;
215        break;
216
217      case offsetof(AlphaAccess, diskBlock):
218        alphaAccess->diskBlock = val;
219        break;
220
221      case offsetof(AlphaAccess, diskOperation):
222        if (val == 0x13)
223            disk->read(alphaAccess->diskPAddr, alphaAccess->diskBlock,
224                       alphaAccess->diskCount);
225        else
226            panic("Invalid disk operation!");
227
228        break;
229
230      case offsetof(AlphaAccess, outputChar):
231        terminal->out((char)(val & 0xff));
232        break;
233
234      default:
235        int cpunum = (daddr - offsetof(AlphaAccess, cpuStack)) /
236                     sizeof(alphaAccess->cpuStack[0]);
237        inform("Launching CPU %d @ %d", cpunum, curTick());
238        assert(val > 0 && "Must not access primary cpu");
239        if (cpunum >= 0 && cpunum < 64)
240            alphaAccess->cpuStack[cpunum] = val;
241        else
242            panic("Unknown 64bit access, %#x\n", daddr);
243    }
244
245    pkt->makeAtomicResponse();
246
247    return pioDelay;
248}
249
250void
251AlphaBackdoor::Access::serialize(ostream &os)
252{
253    SERIALIZE_SCALAR(last_offset);
254    SERIALIZE_SCALAR(version);
255    SERIALIZE_SCALAR(numCPUs);
256    SERIALIZE_SCALAR(mem_size);
257    SERIALIZE_SCALAR(cpuClock);
258    SERIALIZE_SCALAR(intrClockFrequency);
259    SERIALIZE_SCALAR(kernStart);
260    SERIALIZE_SCALAR(kernEnd);
261    SERIALIZE_SCALAR(entryPoint);
262    SERIALIZE_SCALAR(diskUnit);
263    SERIALIZE_SCALAR(diskCount);
264    SERIALIZE_SCALAR(diskPAddr);
265    SERIALIZE_SCALAR(diskBlock);
266    SERIALIZE_SCALAR(diskOperation);
267    SERIALIZE_SCALAR(outputChar);
268    SERIALIZE_SCALAR(inputChar);
269    SERIALIZE_ARRAY(cpuStack,64);
270}
271
272void
273AlphaBackdoor::Access::unserialize(Checkpoint *cp, const std::string &section)
274{
275    UNSERIALIZE_SCALAR(last_offset);
276    UNSERIALIZE_SCALAR(version);
277    UNSERIALIZE_SCALAR(numCPUs);
278    UNSERIALIZE_SCALAR(mem_size);
279    UNSERIALIZE_SCALAR(cpuClock);
280    UNSERIALIZE_SCALAR(intrClockFrequency);
281    UNSERIALIZE_SCALAR(kernStart);
282    UNSERIALIZE_SCALAR(kernEnd);
283    UNSERIALIZE_SCALAR(entryPoint);
284    UNSERIALIZE_SCALAR(diskUnit);
285    UNSERIALIZE_SCALAR(diskCount);
286    UNSERIALIZE_SCALAR(diskPAddr);
287    UNSERIALIZE_SCALAR(diskBlock);
288    UNSERIALIZE_SCALAR(diskOperation);
289    UNSERIALIZE_SCALAR(outputChar);
290    UNSERIALIZE_SCALAR(inputChar);
291    UNSERIALIZE_ARRAY(cpuStack, 64);
292}
293
294void
295AlphaBackdoor::serialize(ostream &os)
296{
297    alphaAccess->serialize(os);
298}
299
300void
301AlphaBackdoor::unserialize(Checkpoint *cp, const std::string &section)
302{
303    alphaAccess->unserialize(cp, section);
304}
305
306AlphaBackdoor *
307AlphaBackdoorParams::create()
308{
309    return new AlphaBackdoor(this);
310}
311