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1 | /* | |
2 | * QEMU 8259 interrupt controller emulation | |
3 | * | |
4 | * Copyright (c) 2003-2004 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #include "hw.h" | |
25 | #include "pc.h" | |
26 | #include "isa.h" | |
27 | #include "monitor.h" | |
28 | #include "qemu-timer.h" | |
29 | #include "i8259_internal.h" | |
30 | ||
31 | /* debug PIC */ | |
32 | //#define DEBUG_PIC | |
33 | ||
34 | #ifdef DEBUG_PIC | |
35 | #define DPRINTF(fmt, ...) \ | |
36 | do { printf("pic: " fmt , ## __VA_ARGS__); } while (0) | |
37 | #else | |
38 | #define DPRINTF(fmt, ...) | |
39 | #endif | |
40 | ||
41 | //#define DEBUG_IRQ_LATENCY | |
42 | //#define DEBUG_IRQ_COUNT | |
43 | ||
44 | #if defined(DEBUG_PIC) || defined(DEBUG_IRQ_COUNT) | |
45 | static int irq_level[16]; | |
46 | #endif | |
47 | #ifdef DEBUG_IRQ_COUNT | |
48 | static uint64_t irq_count[16]; | |
49 | #endif | |
50 | #ifdef DEBUG_IRQ_LATENCY | |
51 | static int64_t irq_time[16]; | |
52 | #endif | |
53 | DeviceState *isa_pic; | |
54 | static PICCommonState *slave_pic; | |
55 | ||
56 | /* return the highest priority found in mask (highest = smallest | |
57 | number). Return 8 if no irq */ | |
58 | static int get_priority(PICCommonState *s, int mask) | |
59 | { | |
60 | int priority; | |
61 | ||
62 | if (mask == 0) { | |
63 | return 8; | |
64 | } | |
65 | priority = 0; | |
66 | while ((mask & (1 << ((priority + s->priority_add) & 7))) == 0) { | |
67 | priority++; | |
68 | } | |
69 | return priority; | |
70 | } | |
71 | ||
72 | /* return the pic wanted interrupt. return -1 if none */ | |
73 | static int pic_get_irq(PICCommonState *s) | |
74 | { | |
75 | int mask, cur_priority, priority; | |
76 | ||
77 | mask = s->irr & ~s->imr; | |
78 | priority = get_priority(s, mask); | |
79 | if (priority == 8) { | |
80 | return -1; | |
81 | } | |
82 | /* compute current priority. If special fully nested mode on the | |
83 | master, the IRQ coming from the slave is not taken into account | |
84 | for the priority computation. */ | |
85 | mask = s->isr; | |
86 | if (s->special_mask) { | |
87 | mask &= ~s->imr; | |
88 | } | |
89 | if (s->special_fully_nested_mode && s->master) { | |
90 | mask &= ~(1 << 2); | |
91 | } | |
92 | cur_priority = get_priority(s, mask); | |
93 | if (priority < cur_priority) { | |
94 | /* higher priority found: an irq should be generated */ | |
95 | return (priority + s->priority_add) & 7; | |
96 | } else { | |
97 | return -1; | |
98 | } | |
99 | } | |
100 | ||
101 | /* Update INT output. Must be called every time the output may have changed. */ | |
102 | static void pic_update_irq(PICCommonState *s) | |
103 | { | |
104 | int irq; | |
105 | ||
106 | irq = pic_get_irq(s); | |
107 | if (irq >= 0) { | |
108 | DPRINTF("pic%d: imr=%x irr=%x padd=%d\n", | |
109 | s->master ? 0 : 1, s->imr, s->irr, s->priority_add); | |
110 | qemu_irq_raise(s->int_out[0]); | |
111 | } else { | |
112 | qemu_irq_lower(s->int_out[0]); | |
113 | } | |
114 | } | |
115 | ||
116 | /* set irq level. If an edge is detected, then the IRR is set to 1 */ | |
117 | static void pic_set_irq(void *opaque, int irq, int level) | |
118 | { | |
119 | PICCommonState *s = opaque; | |
120 | int mask = 1 << irq; | |
121 | ||
122 | #if defined(DEBUG_PIC) || defined(DEBUG_IRQ_COUNT) || \ | |
123 | defined(DEBUG_IRQ_LATENCY) | |
124 | int irq_index = s->master ? irq : irq + 8; | |
125 | #endif | |
126 | #if defined(DEBUG_PIC) || defined(DEBUG_IRQ_COUNT) | |
127 | if (level != irq_level[irq_index]) { | |
128 | DPRINTF("pic_set_irq: irq=%d level=%d\n", irq_index, level); | |
129 | irq_level[irq_index] = level; | |
130 | #ifdef DEBUG_IRQ_COUNT | |
131 | if (level == 1) { | |
132 | irq_count[irq_index]++; | |
133 | } | |
134 | #endif | |
135 | } | |
136 | #endif | |
137 | #ifdef DEBUG_IRQ_LATENCY | |
138 | if (level) { | |
139 | irq_time[irq_index] = qemu_get_clock_ns(vm_clock); | |
140 | } | |
141 | #endif | |
142 | ||
143 | if (s->elcr & mask) { | |
144 | /* level triggered */ | |
145 | if (level) { | |
146 | s->irr |= mask; | |
147 | s->last_irr |= mask; | |
148 | } else { | |
149 | s->irr &= ~mask; | |
150 | s->last_irr &= ~mask; | |
151 | } | |
152 | } else { | |
153 | /* edge triggered */ | |
154 | if (level) { | |
155 | if ((s->last_irr & mask) == 0) { | |
156 | s->irr |= mask; | |
157 | } | |
158 | s->last_irr |= mask; | |
159 | } else { | |
160 | s->last_irr &= ~mask; | |
161 | } | |
162 | } | |
163 | pic_update_irq(s); | |
164 | } | |
165 | ||
166 | /* acknowledge interrupt 'irq' */ | |
167 | static void pic_intack(PICCommonState *s, int irq) | |
168 | { | |
169 | if (s->auto_eoi) { | |
170 | if (s->rotate_on_auto_eoi) { | |
171 | s->priority_add = (irq + 1) & 7; | |
172 | } | |
173 | } else { | |
174 | s->isr |= (1 << irq); | |
175 | } | |
176 | /* We don't clear a level sensitive interrupt here */ | |
177 | if (!(s->elcr & (1 << irq))) { | |
178 | s->irr &= ~(1 << irq); | |
179 | } | |
180 | pic_update_irq(s); | |
181 | } | |
182 | ||
183 | int pic_read_irq(DeviceState *d) | |
184 | { | |
185 | PICCommonState *s = DO_UPCAST(PICCommonState, dev.qdev, d); | |
186 | int irq, irq2, intno; | |
187 | ||
188 | irq = pic_get_irq(s); | |
189 | if (irq >= 0) { | |
190 | if (irq == 2) { | |
191 | irq2 = pic_get_irq(slave_pic); | |
192 | if (irq2 >= 0) { | |
193 | pic_intack(slave_pic, irq2); | |
194 | } else { | |
195 | /* spurious IRQ on slave controller */ | |
196 | irq2 = 7; | |
197 | } | |
198 | intno = slave_pic->irq_base + irq2; | |
199 | } else { | |
200 | intno = s->irq_base + irq; | |
201 | } | |
202 | pic_intack(s, irq); | |
203 | } else { | |
204 | /* spurious IRQ on host controller */ | |
205 | irq = 7; | |
206 | intno = s->irq_base + irq; | |
207 | } | |
208 | ||
209 | #if defined(DEBUG_PIC) || defined(DEBUG_IRQ_LATENCY) | |
210 | if (irq == 2) { | |
211 | irq = irq2 + 8; | |
212 | } | |
213 | #endif | |
214 | #ifdef DEBUG_IRQ_LATENCY | |
215 | printf("IRQ%d latency=%0.3fus\n", | |
216 | irq, | |
217 | (double)(qemu_get_clock_ns(vm_clock) - | |
218 | irq_time[irq]) * 1000000.0 / get_ticks_per_sec()); | |
219 | #endif | |
220 | DPRINTF("pic_interrupt: irq=%d\n", irq); | |
221 | return intno; | |
222 | } | |
223 | ||
224 | static void pic_init_reset(PICCommonState *s) | |
225 | { | |
226 | pic_reset_common(s); | |
227 | pic_update_irq(s); | |
228 | } | |
229 | ||
230 | static void pic_reset(DeviceState *dev) | |
231 | { | |
232 | PICCommonState *s = DO_UPCAST(PICCommonState, dev.qdev, dev); | |
233 | ||
234 | s->elcr = 0; | |
235 | pic_init_reset(s); | |
236 | } | |
237 | ||
238 | static void pic_ioport_write(void *opaque, hwaddr addr64, | |
239 | uint64_t val64, unsigned size) | |
240 | { | |
241 | PICCommonState *s = opaque; | |
242 | uint32_t addr = addr64; | |
243 | uint32_t val = val64; | |
244 | int priority, cmd, irq; | |
245 | ||
246 | DPRINTF("write: addr=0x%02x val=0x%02x\n", addr, val); | |
247 | if (addr == 0) { | |
248 | if (val & 0x10) { | |
249 | pic_init_reset(s); | |
250 | s->init_state = 1; | |
251 | s->init4 = val & 1; | |
252 | s->single_mode = val & 2; | |
253 | if (val & 0x08) { | |
254 | hw_error("level sensitive irq not supported"); | |
255 | } | |
256 | } else if (val & 0x08) { | |
257 | if (val & 0x04) { | |
258 | s->poll = 1; | |
259 | } | |
260 | if (val & 0x02) { | |
261 | s->read_reg_select = val & 1; | |
262 | } | |
263 | if (val & 0x40) { | |
264 | s->special_mask = (val >> 5) & 1; | |
265 | } | |
266 | } else { | |
267 | cmd = val >> 5; | |
268 | switch (cmd) { | |
269 | case 0: | |
270 | case 4: | |
271 | s->rotate_on_auto_eoi = cmd >> 2; | |
272 | break; | |
273 | case 1: /* end of interrupt */ | |
274 | case 5: | |
275 | priority = get_priority(s, s->isr); | |
276 | if (priority != 8) { | |
277 | irq = (priority + s->priority_add) & 7; | |
278 | s->isr &= ~(1 << irq); | |
279 | if (cmd == 5) { | |
280 | s->priority_add = (irq + 1) & 7; | |
281 | } | |
282 | pic_update_irq(s); | |
283 | } | |
284 | break; | |
285 | case 3: | |
286 | irq = val & 7; | |
287 | s->isr &= ~(1 << irq); | |
288 | pic_update_irq(s); | |
289 | break; | |
290 | case 6: | |
291 | s->priority_add = (val + 1) & 7; | |
292 | pic_update_irq(s); | |
293 | break; | |
294 | case 7: | |
295 | irq = val & 7; | |
296 | s->isr &= ~(1 << irq); | |
297 | s->priority_add = (irq + 1) & 7; | |
298 | pic_update_irq(s); | |
299 | break; | |
300 | default: | |
301 | /* no operation */ | |
302 | break; | |
303 | } | |
304 | } | |
305 | } else { | |
306 | switch (s->init_state) { | |
307 | case 0: | |
308 | /* normal mode */ | |
309 | s->imr = val; | |
310 | pic_update_irq(s); | |
311 | break; | |
312 | case 1: | |
313 | s->irq_base = val & 0xf8; | |
314 | s->init_state = s->single_mode ? (s->init4 ? 3 : 0) : 2; | |
315 | break; | |
316 | case 2: | |
317 | if (s->init4) { | |
318 | s->init_state = 3; | |
319 | } else { | |
320 | s->init_state = 0; | |
321 | } | |
322 | break; | |
323 | case 3: | |
324 | s->special_fully_nested_mode = (val >> 4) & 1; | |
325 | s->auto_eoi = (val >> 1) & 1; | |
326 | s->init_state = 0; | |
327 | break; | |
328 | } | |
329 | } | |
330 | } | |
331 | ||
332 | static uint64_t pic_ioport_read(void *opaque, hwaddr addr, | |
333 | unsigned size) | |
334 | { | |
335 | PICCommonState *s = opaque; | |
336 | int ret; | |
337 | ||
338 | if (s->poll) { | |
339 | ret = pic_get_irq(s); | |
340 | if (ret >= 0) { | |
341 | pic_intack(s, ret); | |
342 | ret |= 0x80; | |
343 | } else { | |
344 | ret = 0; | |
345 | } | |
346 | s->poll = 0; | |
347 | } else { | |
348 | if (addr == 0) { | |
349 | if (s->read_reg_select) { | |
350 | ret = s->isr; | |
351 | } else { | |
352 | ret = s->irr; | |
353 | } | |
354 | } else { | |
355 | ret = s->imr; | |
356 | } | |
357 | } | |
358 | DPRINTF("read: addr=0x%02x val=0x%02x\n", addr, ret); | |
359 | return ret; | |
360 | } | |
361 | ||
362 | int pic_get_output(DeviceState *d) | |
363 | { | |
364 | PICCommonState *s = DO_UPCAST(PICCommonState, dev.qdev, d); | |
365 | ||
366 | return (pic_get_irq(s) >= 0); | |
367 | } | |
368 | ||
369 | static void elcr_ioport_write(void *opaque, hwaddr addr, | |
370 | uint64_t val, unsigned size) | |
371 | { | |
372 | PICCommonState *s = opaque; | |
373 | s->elcr = val & s->elcr_mask; | |
374 | } | |
375 | ||
376 | static uint64_t elcr_ioport_read(void *opaque, hwaddr addr, | |
377 | unsigned size) | |
378 | { | |
379 | PICCommonState *s = opaque; | |
380 | return s->elcr; | |
381 | } | |
382 | ||
383 | static const MemoryRegionOps pic_base_ioport_ops = { | |
384 | .read = pic_ioport_read, | |
385 | .write = pic_ioport_write, | |
386 | .impl = { | |
387 | .min_access_size = 1, | |
388 | .max_access_size = 1, | |
389 | }, | |
390 | }; | |
391 | ||
392 | static const MemoryRegionOps pic_elcr_ioport_ops = { | |
393 | .read = elcr_ioport_read, | |
394 | .write = elcr_ioport_write, | |
395 | .impl = { | |
396 | .min_access_size = 1, | |
397 | .max_access_size = 1, | |
398 | }, | |
399 | }; | |
400 | ||
401 | static void pic_init(PICCommonState *s) | |
402 | { | |
403 | memory_region_init_io(&s->base_io, &pic_base_ioport_ops, s, "pic", 2); | |
404 | memory_region_init_io(&s->elcr_io, &pic_elcr_ioport_ops, s, "elcr", 1); | |
405 | ||
406 | qdev_init_gpio_out(&s->dev.qdev, s->int_out, ARRAY_SIZE(s->int_out)); | |
407 | qdev_init_gpio_in(&s->dev.qdev, pic_set_irq, 8); | |
408 | } | |
409 | ||
410 | void pic_info(Monitor *mon) | |
411 | { | |
412 | int i; | |
413 | PICCommonState *s; | |
414 | ||
415 | if (!isa_pic) { | |
416 | return; | |
417 | } | |
418 | for (i = 0; i < 2; i++) { | |
419 | s = i == 0 ? DO_UPCAST(PICCommonState, dev.qdev, isa_pic) : slave_pic; | |
420 | monitor_printf(mon, "pic%d: irr=%02x imr=%02x isr=%02x hprio=%d " | |
421 | "irq_base=%02x rr_sel=%d elcr=%02x fnm=%d\n", | |
422 | i, s->irr, s->imr, s->isr, s->priority_add, | |
423 | s->irq_base, s->read_reg_select, s->elcr, | |
424 | s->special_fully_nested_mode); | |
425 | } | |
426 | } | |
427 | ||
428 | void irq_info(Monitor *mon) | |
429 | { | |
430 | #ifndef DEBUG_IRQ_COUNT | |
431 | monitor_printf(mon, "irq statistic code not compiled.\n"); | |
432 | #else | |
433 | int i; | |
434 | int64_t count; | |
435 | ||
436 | monitor_printf(mon, "IRQ statistics:\n"); | |
437 | for (i = 0; i < 16; i++) { | |
438 | count = irq_count[i]; | |
439 | if (count > 0) { | |
440 | monitor_printf(mon, "%2d: %" PRId64 "\n", i, count); | |
441 | } | |
442 | } | |
443 | #endif | |
444 | } | |
445 | ||
446 | qemu_irq *i8259_init(ISABus *bus, qemu_irq parent_irq) | |
447 | { | |
448 | qemu_irq *irq_set; | |
449 | ISADevice *dev; | |
450 | int i; | |
451 | ||
452 | irq_set = g_malloc(ISA_NUM_IRQS * sizeof(qemu_irq)); | |
453 | ||
454 | dev = i8259_init_chip("isa-i8259", bus, true); | |
455 | ||
456 | qdev_connect_gpio_out(&dev->qdev, 0, parent_irq); | |
457 | for (i = 0 ; i < 8; i++) { | |
458 | irq_set[i] = qdev_get_gpio_in(&dev->qdev, i); | |
459 | } | |
460 | ||
461 | isa_pic = &dev->qdev; | |
462 | ||
463 | dev = i8259_init_chip("isa-i8259", bus, false); | |
464 | ||
465 | qdev_connect_gpio_out(&dev->qdev, 0, irq_set[2]); | |
466 | for (i = 0 ; i < 8; i++) { | |
467 | irq_set[i + 8] = qdev_get_gpio_in(&dev->qdev, i); | |
468 | } | |
469 | ||
470 | slave_pic = DO_UPCAST(PICCommonState, dev, dev); | |
471 | ||
472 | return irq_set; | |
473 | } | |
474 | ||
475 | static void i8259_class_init(ObjectClass *klass, void *data) | |
476 | { | |
477 | PICCommonClass *k = PIC_COMMON_CLASS(klass); | |
478 | DeviceClass *dc = DEVICE_CLASS(klass); | |
479 | ||
480 | k->init = pic_init; | |
481 | dc->reset = pic_reset; | |
482 | } | |
483 | ||
484 | static TypeInfo i8259_info = { | |
485 | .name = "isa-i8259", | |
486 | .instance_size = sizeof(PICCommonState), | |
487 | .parent = TYPE_PIC_COMMON, | |
488 | .class_init = i8259_class_init, | |
489 | }; | |
490 | ||
491 | static void pic_register_types(void) | |
492 | { | |
493 | type_register_static(&i8259_info); | |
494 | } | |
495 | ||
496 | type_init(pic_register_types) |