32#include "dev/x86/i82094aa.hh"
33#include "dev/x86/i8259.hh"
34#include "mem/packet.hh"
35#include "mem/packet_access.hh"
36
37X86ISA::I8259::I8259(Params * p) : BasicPioDevice(p), IntDev(this),
38 latency(p->pio_latency), output(p->output),
39 mode(p->mode), slave(p->slave),
40 IRR(0), ISR(0), IMR(0),
41 readIRR(true), initControlWord(0), autoEOI(false)
42{
43 for (int i = 0; i < NumLines; i++)
44 pinStates[i] = false;
45 pioSize = 2;
46}
47
48Tick
49X86ISA::I8259::read(PacketPtr pkt)
50{
51 assert(pkt->getSize() == 1);
52 switch(pkt->getAddr() - pioAddr)
53 {
54 case 0x0:
55 if (readIRR) {
56 DPRINTF(I8259, "Reading IRR as %#x.\n", IRR);
57 pkt->set(IRR);
58 } else {
59 DPRINTF(I8259, "Reading ISR as %#x.\n", ISR);
60 pkt->set(ISR);
61 }
62 break;
63 case 0x1:
64 DPRINTF(I8259, "Reading IMR as %#x.\n", IMR);
65 pkt->set(IMR);
66 break;
67 }
68 pkt->makeAtomicResponse();
69 return latency;
70}
71
72Tick
73X86ISA::I8259::write(PacketPtr pkt)
74{
75 assert(pkt->getSize() == 1);
76 uint8_t val = pkt->get<uint8_t>();
77 switch (pkt->getAddr() - pioAddr) {
78 case 0x0:
79 if (bits(val, 4)) {
80 DPRINTF(I8259, "Received initialization command word 1.\n");
81 IMR = 0;
82 edgeTriggered = bits(val, 3);
83 DPRINTF(I8259, "%s triggered mode.\n",
84 edgeTriggered ? "Edge" : "Level");
85 cascadeMode = !bits(val, 1);
86 DPRINTF(I8259, "%s mode.\n",
87 cascadeMode ? "Cascade" : "Single");
88 expectICW4 = bits(val, 0);
89 if (!expectICW4) {
90 autoEOI = false;
91 }
92 initControlWord = 1;
93 DPRINTF(I8259, "Expecting %d more bytes.\n", expectICW4 ? 3 : 2);
94 } else if (bits(val, 4, 3) == 0) {
95 DPRINTF(I8259, "Received operation command word 2.\n");
96 switch (bits(val, 7, 5)) {
97 case 0x0:
98 DPRINTF(I8259,
99 "Subcommand: Rotate in auto-EOI mode (clear).\n");
100 break;
101 case 0x1:
102 {
103 int line = findMsbSet(ISR);
104 DPRINTF(I8259, "Subcommand: Nonspecific EOI on line %d.\n",
105 line);
106 handleEOI(line);
107 }
108 break;
109 case 0x2:
110 DPRINTF(I8259, "Subcommand: No operation.\n");
111 break;
112 case 0x3:
113 {
114 int line = bits(val, 2, 0);
115 DPRINTF(I8259, "Subcommand: Specific EIO on line %d.\n",
116 line);
117 handleEOI(line);
118 }
119 break;
120 case 0x4:
121 DPRINTF(I8259, "Subcommand: Rotate in auto-EOI mode (set).\n");
122 break;
123 case 0x5:
124 DPRINTF(I8259, "Subcommand: Rotate on nonspecific EOI.\n");
125 break;
126 case 0x6:
127 DPRINTF(I8259, "Subcommand: Set priority command.\n");
128 DPRINTF(I8259, "Lowest: IRQ%d Highest IRQ%d.\n",
129 bits(val, 2, 0), (bits(val, 2, 0) + 1) % 8);
130 break;
131 case 0x7:
132 DPRINTF(I8259, "Subcommand: Rotate on specific EOI.\n");
133 DPRINTF(I8259, "Lowest: IRQ%d Highest IRQ%d.\n",
134 bits(val, 2, 0), (bits(val, 2, 0) + 1) % 8);
135 break;
136 }
137 } else if (bits(val, 4, 3) == 1) {
138 DPRINTF(I8259, "Received operation command word 3.\n");
139 if (bits(val, 7)) {
140 DPRINTF(I8259, "%s special mask mode.\n",
141 bits(val, 6) ? "Set" : "Clear");
142 }
143 if (bits(val, 1)) {
144 readIRR = bits(val, 0);
145 DPRINTF(I8259, "Read %s.\n", readIRR ? "IRR" : "ISR");
146 }
147 }
148 break;
149 case 0x1:
150 switch (initControlWord) {
151 case 0x0:
152 DPRINTF(I8259, "Received operation command word 1.\n");
153 DPRINTF(I8259, "Wrote IMR value %#x.\n", val);
154 IMR = val;
155 break;
156 case 0x1:
157 DPRINTF(I8259, "Received initialization command word 2.\n");
158 vectorOffset = val & ~mask(3);
159 DPRINTF(I8259, "Responsible for vectors %#x-%#x.\n",
160 vectorOffset, vectorOffset | mask(3));
161 if (cascadeMode) {
162 initControlWord++;
163 } else {
164 cascadeBits = 0;
165 initControlWord = 0;
166 }
167 break;
168 case 0x2:
169 DPRINTF(I8259, "Received initialization command word 3.\n");
170 if (mode == Enums::I8259Master) {
171 DPRINTF(I8259, "Slaves attached to IRQs:%s%s%s%s%s%s%s%s\n",
172 bits(val, 0) ? " 0" : "",
173 bits(val, 1) ? " 1" : "",
174 bits(val, 2) ? " 2" : "",
175 bits(val, 3) ? " 3" : "",
176 bits(val, 4) ? " 4" : "",
177 bits(val, 5) ? " 5" : "",
178 bits(val, 6) ? " 6" : "",
179 bits(val, 7) ? " 7" : "");
180 cascadeBits = val;
181 } else {
182 DPRINTF(I8259, "Slave ID is %d.\n", val & mask(3));
183 cascadeBits = val & mask(3);
184 }
185 if (expectICW4)
186 initControlWord++;
187 else
188 initControlWord = 0;
189 break;
190 case 0x3:
191 DPRINTF(I8259, "Received initialization command word 4.\n");
192 if (bits(val, 4)) {
193 DPRINTF(I8259, "Special fully nested mode.\n");
194 } else {
195 DPRINTF(I8259, "Not special fully nested mode.\n");
196 }
197 if (bits(val, 3) == 0) {
198 DPRINTF(I8259, "Nonbuffered.\n");
199 } else if (bits(val, 2) == 0) {
200 DPRINTF(I8259, "Buffered.\n");
201 } else {
202 DPRINTF(I8259, "Unrecognized buffer mode.\n");
203 }
204 autoEOI = bits(val, 1);
205 DPRINTF(I8259, "%s End Of Interrupt.\n",
206 autoEOI ? "Automatic" : "Normal");
207
208 DPRINTF(I8259, "%s mode.\n", bits(val, 0) ? "80x86" : "MCX-80/85");
209 initControlWord = 0;
210 break;
211 }
212 break;
213 }
214 pkt->makeAtomicResponse();
215 return latency;
216}
217
218void
219X86ISA::I8259::handleEOI(int line)
220{
221 ISR &= ~(1 << line);
222 // There may be an interrupt that was waiting which can
223 // now be sent.
224 if (IRR)
225 requestInterrupt(findMsbSet(IRR));
226}
227
228void
229X86ISA::I8259::requestInterrupt(int line)
230{
231 if (bits(ISR, 7, line) == 0) {
232 if (output) {
233 DPRINTF(I8259, "Propogating interrupt.\n");
234 output->raise();
235 //XXX This is a hack.
236 output->lower();
237 } else {
238 warn("Received interrupt but didn't have "
239 "anyone to tell about it.\n");
240 }
241 }
242}
243
244void
245X86ISA::I8259::signalInterrupt(int line)
246{
247 DPRINTF(I8259, "Interrupt requested for line %d.\n", line);
248 if (line >= NumLines)
249 fatal("Line number %d doesn't exist. The max is %d.\n",
250 line, NumLines - 1);
251 if (bits(IMR, line)) {
252 DPRINTF(I8259, "Interrupt %d was masked.\n", line);
253 } else {
254 IRR |= 1 << line;
255 requestInterrupt(line);
256 }
257}
258
259void
260X86ISA::I8259::raiseInterruptPin(int number)
261{
262 DPRINTF(I8259, "Interrupt signal raised for pin %d.\n", number);
263 if (number >= NumLines)
264 fatal("Line number %d doesn't exist. The max is %d.\n",
265 number, NumLines - 1);
266 if (!pinStates[number])
267 signalInterrupt(number);
268 pinStates[number] = true;
269}
270
271void
272X86ISA::I8259::lowerInterruptPin(int number)
273{
274 DPRINTF(I8259, "Interrupt signal lowered for pin %d.\n", number);
275 if (number >= NumLines)
276 fatal("Line number %d doesn't exist. The max is %d.\n",
277 number, NumLines - 1);
278 pinStates[number] = false;
279}
280
281int
282X86ISA::I8259::getVector()
283{
284 /*
285 * This code only handles one slave. Since that's how the PC platform
286 * always uses the 8259 PIC, there shouldn't be any need for more. If
287 * there -is- a need for more for some reason, "slave" can become a
288 * vector of slaves.
289 */
290 int line = findMsbSet(IRR);
291 IRR &= ~(1 << line);
292 DPRINTF(I8259, "Interrupt %d was accepted.\n", line);
293 if (autoEOI) {
294 handleEOI(line);
295 } else {
296 ISR |= 1 << line;
297 }
298 if (slave && bits(cascadeBits, line)) {
299 DPRINTF(I8259, "Interrupt was from slave who will "
300 "provide the vector.\n");
301 return slave->getVector();
302 }
303 return line | vectorOffset;
304}
305
306void
307X86ISA::I8259::serialize(std::ostream &os)
308{
309 SERIALIZE_ARRAY(pinStates, NumLines);
310 SERIALIZE_ENUM(mode);
311 SERIALIZE_SCALAR(IRR);
312 SERIALIZE_SCALAR(ISR);
313 SERIALIZE_SCALAR(IMR);
314 SERIALIZE_SCALAR(vectorOffset);
315 SERIALIZE_SCALAR(cascadeMode);
316 SERIALIZE_SCALAR(cascadeBits);
317 SERIALIZE_SCALAR(edgeTriggered);
318 SERIALIZE_SCALAR(readIRR);
319 SERIALIZE_SCALAR(expectICW4);
320 SERIALIZE_SCALAR(initControlWord);
321 SERIALIZE_SCALAR(autoEOI);
322}
323
324void
325X86ISA::I8259::unserialize(Checkpoint *cp, const std::string §ion)
326{
327 UNSERIALIZE_ARRAY(pinStates, NumLines);
328 UNSERIALIZE_ENUM(mode);
329 UNSERIALIZE_SCALAR(IRR);
330 UNSERIALIZE_SCALAR(ISR);
331 UNSERIALIZE_SCALAR(IMR);
332 UNSERIALIZE_SCALAR(vectorOffset);
333 UNSERIALIZE_SCALAR(cascadeMode);
334 UNSERIALIZE_SCALAR(cascadeBits);
335 UNSERIALIZE_SCALAR(edgeTriggered);
336 UNSERIALIZE_SCALAR(readIRR);
337 UNSERIALIZE_SCALAR(expectICW4);
338 UNSERIALIZE_SCALAR(initControlWord);
339 UNSERIALIZE_SCALAR(autoEOI);
340}
341
342X86ISA::I8259 *
343I8259Params::create()
344{
345 return new X86ISA::I8259(this);
346}
| 33#include "dev/x86/i82094aa.hh"
34#include "dev/x86/i8259.hh"
35#include "mem/packet.hh"
36#include "mem/packet_access.hh"
37
38X86ISA::I8259::I8259(Params * p) : BasicPioDevice(p), IntDev(this),
39 latency(p->pio_latency), output(p->output),
40 mode(p->mode), slave(p->slave),
41 IRR(0), ISR(0), IMR(0),
42 readIRR(true), initControlWord(0), autoEOI(false)
43{
44 for (int i = 0; i < NumLines; i++)
45 pinStates[i] = false;
46 pioSize = 2;
47}
48
49Tick
50X86ISA::I8259::read(PacketPtr pkt)
51{
52 assert(pkt->getSize() == 1);
53 switch(pkt->getAddr() - pioAddr)
54 {
55 case 0x0:
56 if (readIRR) {
57 DPRINTF(I8259, "Reading IRR as %#x.\n", IRR);
58 pkt->set(IRR);
59 } else {
60 DPRINTF(I8259, "Reading ISR as %#x.\n", ISR);
61 pkt->set(ISR);
62 }
63 break;
64 case 0x1:
65 DPRINTF(I8259, "Reading IMR as %#x.\n", IMR);
66 pkt->set(IMR);
67 break;
68 }
69 pkt->makeAtomicResponse();
70 return latency;
71}
72
73Tick
74X86ISA::I8259::write(PacketPtr pkt)
75{
76 assert(pkt->getSize() == 1);
77 uint8_t val = pkt->get<uint8_t>();
78 switch (pkt->getAddr() - pioAddr) {
79 case 0x0:
80 if (bits(val, 4)) {
81 DPRINTF(I8259, "Received initialization command word 1.\n");
82 IMR = 0;
83 edgeTriggered = bits(val, 3);
84 DPRINTF(I8259, "%s triggered mode.\n",
85 edgeTriggered ? "Edge" : "Level");
86 cascadeMode = !bits(val, 1);
87 DPRINTF(I8259, "%s mode.\n",
88 cascadeMode ? "Cascade" : "Single");
89 expectICW4 = bits(val, 0);
90 if (!expectICW4) {
91 autoEOI = false;
92 }
93 initControlWord = 1;
94 DPRINTF(I8259, "Expecting %d more bytes.\n", expectICW4 ? 3 : 2);
95 } else if (bits(val, 4, 3) == 0) {
96 DPRINTF(I8259, "Received operation command word 2.\n");
97 switch (bits(val, 7, 5)) {
98 case 0x0:
99 DPRINTF(I8259,
100 "Subcommand: Rotate in auto-EOI mode (clear).\n");
101 break;
102 case 0x1:
103 {
104 int line = findMsbSet(ISR);
105 DPRINTF(I8259, "Subcommand: Nonspecific EOI on line %d.\n",
106 line);
107 handleEOI(line);
108 }
109 break;
110 case 0x2:
111 DPRINTF(I8259, "Subcommand: No operation.\n");
112 break;
113 case 0x3:
114 {
115 int line = bits(val, 2, 0);
116 DPRINTF(I8259, "Subcommand: Specific EIO on line %d.\n",
117 line);
118 handleEOI(line);
119 }
120 break;
121 case 0x4:
122 DPRINTF(I8259, "Subcommand: Rotate in auto-EOI mode (set).\n");
123 break;
124 case 0x5:
125 DPRINTF(I8259, "Subcommand: Rotate on nonspecific EOI.\n");
126 break;
127 case 0x6:
128 DPRINTF(I8259, "Subcommand: Set priority command.\n");
129 DPRINTF(I8259, "Lowest: IRQ%d Highest IRQ%d.\n",
130 bits(val, 2, 0), (bits(val, 2, 0) + 1) % 8);
131 break;
132 case 0x7:
133 DPRINTF(I8259, "Subcommand: Rotate on specific EOI.\n");
134 DPRINTF(I8259, "Lowest: IRQ%d Highest IRQ%d.\n",
135 bits(val, 2, 0), (bits(val, 2, 0) + 1) % 8);
136 break;
137 }
138 } else if (bits(val, 4, 3) == 1) {
139 DPRINTF(I8259, "Received operation command word 3.\n");
140 if (bits(val, 7)) {
141 DPRINTF(I8259, "%s special mask mode.\n",
142 bits(val, 6) ? "Set" : "Clear");
143 }
144 if (bits(val, 1)) {
145 readIRR = bits(val, 0);
146 DPRINTF(I8259, "Read %s.\n", readIRR ? "IRR" : "ISR");
147 }
148 }
149 break;
150 case 0x1:
151 switch (initControlWord) {
152 case 0x0:
153 DPRINTF(I8259, "Received operation command word 1.\n");
154 DPRINTF(I8259, "Wrote IMR value %#x.\n", val);
155 IMR = val;
156 break;
157 case 0x1:
158 DPRINTF(I8259, "Received initialization command word 2.\n");
159 vectorOffset = val & ~mask(3);
160 DPRINTF(I8259, "Responsible for vectors %#x-%#x.\n",
161 vectorOffset, vectorOffset | mask(3));
162 if (cascadeMode) {
163 initControlWord++;
164 } else {
165 cascadeBits = 0;
166 initControlWord = 0;
167 }
168 break;
169 case 0x2:
170 DPRINTF(I8259, "Received initialization command word 3.\n");
171 if (mode == Enums::I8259Master) {
172 DPRINTF(I8259, "Slaves attached to IRQs:%s%s%s%s%s%s%s%s\n",
173 bits(val, 0) ? " 0" : "",
174 bits(val, 1) ? " 1" : "",
175 bits(val, 2) ? " 2" : "",
176 bits(val, 3) ? " 3" : "",
177 bits(val, 4) ? " 4" : "",
178 bits(val, 5) ? " 5" : "",
179 bits(val, 6) ? " 6" : "",
180 bits(val, 7) ? " 7" : "");
181 cascadeBits = val;
182 } else {
183 DPRINTF(I8259, "Slave ID is %d.\n", val & mask(3));
184 cascadeBits = val & mask(3);
185 }
186 if (expectICW4)
187 initControlWord++;
188 else
189 initControlWord = 0;
190 break;
191 case 0x3:
192 DPRINTF(I8259, "Received initialization command word 4.\n");
193 if (bits(val, 4)) {
194 DPRINTF(I8259, "Special fully nested mode.\n");
195 } else {
196 DPRINTF(I8259, "Not special fully nested mode.\n");
197 }
198 if (bits(val, 3) == 0) {
199 DPRINTF(I8259, "Nonbuffered.\n");
200 } else if (bits(val, 2) == 0) {
201 DPRINTF(I8259, "Buffered.\n");
202 } else {
203 DPRINTF(I8259, "Unrecognized buffer mode.\n");
204 }
205 autoEOI = bits(val, 1);
206 DPRINTF(I8259, "%s End Of Interrupt.\n",
207 autoEOI ? "Automatic" : "Normal");
208
209 DPRINTF(I8259, "%s mode.\n", bits(val, 0) ? "80x86" : "MCX-80/85");
210 initControlWord = 0;
211 break;
212 }
213 break;
214 }
215 pkt->makeAtomicResponse();
216 return latency;
217}
218
219void
220X86ISA::I8259::handleEOI(int line)
221{
222 ISR &= ~(1 << line);
223 // There may be an interrupt that was waiting which can
224 // now be sent.
225 if (IRR)
226 requestInterrupt(findMsbSet(IRR));
227}
228
229void
230X86ISA::I8259::requestInterrupt(int line)
231{
232 if (bits(ISR, 7, line) == 0) {
233 if (output) {
234 DPRINTF(I8259, "Propogating interrupt.\n");
235 output->raise();
236 //XXX This is a hack.
237 output->lower();
238 } else {
239 warn("Received interrupt but didn't have "
240 "anyone to tell about it.\n");
241 }
242 }
243}
244
245void
246X86ISA::I8259::signalInterrupt(int line)
247{
248 DPRINTF(I8259, "Interrupt requested for line %d.\n", line);
249 if (line >= NumLines)
250 fatal("Line number %d doesn't exist. The max is %d.\n",
251 line, NumLines - 1);
252 if (bits(IMR, line)) {
253 DPRINTF(I8259, "Interrupt %d was masked.\n", line);
254 } else {
255 IRR |= 1 << line;
256 requestInterrupt(line);
257 }
258}
259
260void
261X86ISA::I8259::raiseInterruptPin(int number)
262{
263 DPRINTF(I8259, "Interrupt signal raised for pin %d.\n", number);
264 if (number >= NumLines)
265 fatal("Line number %d doesn't exist. The max is %d.\n",
266 number, NumLines - 1);
267 if (!pinStates[number])
268 signalInterrupt(number);
269 pinStates[number] = true;
270}
271
272void
273X86ISA::I8259::lowerInterruptPin(int number)
274{
275 DPRINTF(I8259, "Interrupt signal lowered for pin %d.\n", number);
276 if (number >= NumLines)
277 fatal("Line number %d doesn't exist. The max is %d.\n",
278 number, NumLines - 1);
279 pinStates[number] = false;
280}
281
282int
283X86ISA::I8259::getVector()
284{
285 /*
286 * This code only handles one slave. Since that's how the PC platform
287 * always uses the 8259 PIC, there shouldn't be any need for more. If
288 * there -is- a need for more for some reason, "slave" can become a
289 * vector of slaves.
290 */
291 int line = findMsbSet(IRR);
292 IRR &= ~(1 << line);
293 DPRINTF(I8259, "Interrupt %d was accepted.\n", line);
294 if (autoEOI) {
295 handleEOI(line);
296 } else {
297 ISR |= 1 << line;
298 }
299 if (slave && bits(cascadeBits, line)) {
300 DPRINTF(I8259, "Interrupt was from slave who will "
301 "provide the vector.\n");
302 return slave->getVector();
303 }
304 return line | vectorOffset;
305}
306
307void
308X86ISA::I8259::serialize(std::ostream &os)
309{
310 SERIALIZE_ARRAY(pinStates, NumLines);
311 SERIALIZE_ENUM(mode);
312 SERIALIZE_SCALAR(IRR);
313 SERIALIZE_SCALAR(ISR);
314 SERIALIZE_SCALAR(IMR);
315 SERIALIZE_SCALAR(vectorOffset);
316 SERIALIZE_SCALAR(cascadeMode);
317 SERIALIZE_SCALAR(cascadeBits);
318 SERIALIZE_SCALAR(edgeTriggered);
319 SERIALIZE_SCALAR(readIRR);
320 SERIALIZE_SCALAR(expectICW4);
321 SERIALIZE_SCALAR(initControlWord);
322 SERIALIZE_SCALAR(autoEOI);
323}
324
325void
326X86ISA::I8259::unserialize(Checkpoint *cp, const std::string §ion)
327{
328 UNSERIALIZE_ARRAY(pinStates, NumLines);
329 UNSERIALIZE_ENUM(mode);
330 UNSERIALIZE_SCALAR(IRR);
331 UNSERIALIZE_SCALAR(ISR);
332 UNSERIALIZE_SCALAR(IMR);
333 UNSERIALIZE_SCALAR(vectorOffset);
334 UNSERIALIZE_SCALAR(cascadeMode);
335 UNSERIALIZE_SCALAR(cascadeBits);
336 UNSERIALIZE_SCALAR(edgeTriggered);
337 UNSERIALIZE_SCALAR(readIRR);
338 UNSERIALIZE_SCALAR(expectICW4);
339 UNSERIALIZE_SCALAR(initControlWord);
340 UNSERIALIZE_SCALAR(autoEOI);
341}
342
343X86ISA::I8259 *
344I8259Params::create()
345{
346 return new X86ISA::I8259(this);
347}
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