Commit | Line | Data |
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85f455f7 ED |
1 | /* |
2 | * 8259 interrupt controller emulation | |
3 | * | |
4 | * Copyright (c) 2003-2004 Fabrice Bellard | |
5 | * Copyright (c) 2007 Intel Corporation | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | * Authors: | |
25 | * Yaozu (Eddie) Dong <Eddie.dong@intel.com> | |
26 | * Port from Qemu. | |
27 | */ | |
28 | #include <linux/mm.h> | |
3f353858 | 29 | #include <linux/bitops.h> |
85f455f7 | 30 | #include "irq.h" |
edf88417 AK |
31 | |
32 | #include <linux/kvm_host.h> | |
85f455f7 | 33 | |
3f353858 AK |
34 | static void pic_lock(struct kvm_pic *s) |
35 | { | |
36 | spin_lock(&s->lock); | |
37 | } | |
38 | ||
39 | static void pic_unlock(struct kvm_pic *s) | |
40 | { | |
41 | struct kvm *kvm = s->kvm; | |
42 | unsigned acks = s->pending_acks; | |
43 | bool wakeup = s->wakeup_needed; | |
44 | struct kvm_vcpu *vcpu; | |
45 | ||
46 | s->pending_acks = 0; | |
47 | s->wakeup_needed = false; | |
48 | ||
49 | spin_unlock(&s->lock); | |
50 | ||
51 | while (acks) { | |
44882eed MT |
52 | kvm_notify_acked_irq(kvm, SELECT_PIC(__ffs(acks)), |
53 | __ffs(acks)); | |
3f353858 AK |
54 | acks &= acks - 1; |
55 | } | |
56 | ||
57 | if (wakeup) { | |
58 | vcpu = s->kvm->vcpus[0]; | |
59 | if (vcpu) | |
60 | kvm_vcpu_kick(vcpu); | |
61 | } | |
62 | } | |
63 | ||
7edd0ce0 AK |
64 | static void pic_clear_isr(struct kvm_kpic_state *s, int irq) |
65 | { | |
66 | s->isr &= ~(1 << irq); | |
e4825800 MT |
67 | s->isr_ack |= (1 << irq); |
68 | } | |
69 | ||
70 | void kvm_pic_clear_isr_ack(struct kvm *kvm) | |
71 | { | |
72 | struct kvm_pic *s = pic_irqchip(kvm); | |
73 | s->pics[0].isr_ack = 0xff; | |
74 | s->pics[1].isr_ack = 0xff; | |
7edd0ce0 AK |
75 | } |
76 | ||
85f455f7 ED |
77 | /* |
78 | * set irq level. If an edge is detected, then the IRR is set to 1 | |
79 | */ | |
80 | static inline void pic_set_irq1(struct kvm_kpic_state *s, int irq, int level) | |
81 | { | |
82 | int mask; | |
83 | mask = 1 << irq; | |
84 | if (s->elcr & mask) /* level triggered */ | |
85 | if (level) { | |
86 | s->irr |= mask; | |
87 | s->last_irr |= mask; | |
88 | } else { | |
89 | s->irr &= ~mask; | |
90 | s->last_irr &= ~mask; | |
91 | } | |
92 | else /* edge triggered */ | |
93 | if (level) { | |
94 | if ((s->last_irr & mask) == 0) | |
95 | s->irr |= mask; | |
96 | s->last_irr |= mask; | |
97 | } else | |
98 | s->last_irr &= ~mask; | |
99 | } | |
100 | ||
101 | /* | |
102 | * return the highest priority found in mask (highest = smallest | |
103 | * number). Return 8 if no irq | |
104 | */ | |
105 | static inline int get_priority(struct kvm_kpic_state *s, int mask) | |
106 | { | |
107 | int priority; | |
108 | if (mask == 0) | |
109 | return 8; | |
110 | priority = 0; | |
111 | while ((mask & (1 << ((priority + s->priority_add) & 7))) == 0) | |
112 | priority++; | |
113 | return priority; | |
114 | } | |
115 | ||
116 | /* | |
117 | * return the pic wanted interrupt. return -1 if none | |
118 | */ | |
119 | static int pic_get_irq(struct kvm_kpic_state *s) | |
120 | { | |
121 | int mask, cur_priority, priority; | |
122 | ||
123 | mask = s->irr & ~s->imr; | |
124 | priority = get_priority(s, mask); | |
125 | if (priority == 8) | |
126 | return -1; | |
127 | /* | |
128 | * compute current priority. If special fully nested mode on the | |
129 | * master, the IRQ coming from the slave is not taken into account | |
130 | * for the priority computation. | |
131 | */ | |
132 | mask = s->isr; | |
133 | if (s->special_fully_nested_mode && s == &s->pics_state->pics[0]) | |
134 | mask &= ~(1 << 2); | |
135 | cur_priority = get_priority(s, mask); | |
136 | if (priority < cur_priority) | |
137 | /* | |
138 | * higher priority found: an irq should be generated | |
139 | */ | |
140 | return (priority + s->priority_add) & 7; | |
141 | else | |
142 | return -1; | |
143 | } | |
144 | ||
145 | /* | |
146 | * raise irq to CPU if necessary. must be called every time the active | |
147 | * irq may change | |
148 | */ | |
149 | static void pic_update_irq(struct kvm_pic *s) | |
150 | { | |
151 | int irq2, irq; | |
152 | ||
153 | irq2 = pic_get_irq(&s->pics[1]); | |
154 | if (irq2 >= 0) { | |
155 | /* | |
156 | * if irq request by slave pic, signal master PIC | |
157 | */ | |
158 | pic_set_irq1(&s->pics[0], 2, 1); | |
159 | pic_set_irq1(&s->pics[0], 2, 0); | |
160 | } | |
161 | irq = pic_get_irq(&s->pics[0]); | |
162 | if (irq >= 0) | |
163 | s->irq_request(s->irq_request_opaque, 1); | |
164 | else | |
165 | s->irq_request(s->irq_request_opaque, 0); | |
166 | } | |
167 | ||
6ceb9d79 HQ |
168 | void kvm_pic_update_irq(struct kvm_pic *s) |
169 | { | |
3f353858 | 170 | pic_lock(s); |
6ceb9d79 | 171 | pic_update_irq(s); |
3f353858 | 172 | pic_unlock(s); |
6ceb9d79 HQ |
173 | } |
174 | ||
85f455f7 ED |
175 | void kvm_pic_set_irq(void *opaque, int irq, int level) |
176 | { | |
177 | struct kvm_pic *s = opaque; | |
178 | ||
3f353858 | 179 | pic_lock(s); |
c65bbfa1 BAY |
180 | if (irq >= 0 && irq < PIC_NUM_PINS) { |
181 | pic_set_irq1(&s->pics[irq >> 3], irq & 7, level); | |
182 | pic_update_irq(s); | |
183 | } | |
3f353858 | 184 | pic_unlock(s); |
85f455f7 ED |
185 | } |
186 | ||
187 | /* | |
188 | * acknowledge interrupt 'irq' | |
189 | */ | |
190 | static inline void pic_intack(struct kvm_kpic_state *s, int irq) | |
191 | { | |
7edd0ce0 | 192 | s->isr |= 1 << irq; |
85f455f7 ED |
193 | if (s->auto_eoi) { |
194 | if (s->rotate_on_auto_eoi) | |
195 | s->priority_add = (irq + 1) & 7; | |
7edd0ce0 AK |
196 | pic_clear_isr(s, irq); |
197 | } | |
85f455f7 ED |
198 | /* |
199 | * We don't clear a level sensitive interrupt here | |
200 | */ | |
201 | if (!(s->elcr & (1 << irq))) | |
202 | s->irr &= ~(1 << irq); | |
203 | } | |
204 | ||
f5244726 | 205 | int kvm_pic_read_irq(struct kvm *kvm) |
85f455f7 ED |
206 | { |
207 | int irq, irq2, intno; | |
f5244726 | 208 | struct kvm_pic *s = pic_irqchip(kvm); |
85f455f7 | 209 | |
3f353858 | 210 | pic_lock(s); |
85f455f7 ED |
211 | irq = pic_get_irq(&s->pics[0]); |
212 | if (irq >= 0) { | |
213 | pic_intack(&s->pics[0], irq); | |
214 | if (irq == 2) { | |
215 | irq2 = pic_get_irq(&s->pics[1]); | |
216 | if (irq2 >= 0) | |
217 | pic_intack(&s->pics[1], irq2); | |
218 | else | |
219 | /* | |
220 | * spurious IRQ on slave controller | |
221 | */ | |
222 | irq2 = 7; | |
223 | intno = s->pics[1].irq_base + irq2; | |
224 | irq = irq2 + 8; | |
225 | } else | |
226 | intno = s->pics[0].irq_base + irq; | |
227 | } else { | |
228 | /* | |
229 | * spurious IRQ on host controller | |
230 | */ | |
231 | irq = 7; | |
232 | intno = s->pics[0].irq_base + irq; | |
233 | } | |
234 | pic_update_irq(s); | |
3f353858 | 235 | pic_unlock(s); |
44882eed | 236 | kvm_notify_acked_irq(kvm, SELECT_PIC(irq), irq); |
85f455f7 ED |
237 | |
238 | return intno; | |
239 | } | |
240 | ||
2fcceae1 | 241 | void kvm_pic_reset(struct kvm_kpic_state *s) |
85f455f7 | 242 | { |
3f353858 | 243 | int irq, irqbase, n; |
f5244726 | 244 | struct kvm *kvm = s->pics_state->irq_request_opaque; |
85428ac7 | 245 | struct kvm_vcpu *vcpu0 = kvm->vcpus[0]; |
f5244726 | 246 | |
85428ac7 MT |
247 | if (s == &s->pics_state->pics[0]) |
248 | irqbase = 0; | |
249 | else | |
250 | irqbase = 8; | |
251 | ||
252 | for (irq = 0; irq < PIC_NUM_PINS/2; irq++) { | |
253 | if (vcpu0 && kvm_apic_accept_pic_intr(vcpu0)) | |
3f353858 AK |
254 | if (s->irr & (1 << irq) || s->isr & (1 << irq)) { |
255 | n = irq + irqbase; | |
256 | s->pics_state->pending_acks |= 1 << n; | |
257 | } | |
f5244726 | 258 | } |
85f455f7 ED |
259 | s->last_irr = 0; |
260 | s->irr = 0; | |
261 | s->imr = 0; | |
262 | s->isr = 0; | |
e4825800 | 263 | s->isr_ack = 0xff; |
85f455f7 ED |
264 | s->priority_add = 0; |
265 | s->irq_base = 0; | |
266 | s->read_reg_select = 0; | |
267 | s->poll = 0; | |
268 | s->special_mask = 0; | |
269 | s->init_state = 0; | |
270 | s->auto_eoi = 0; | |
271 | s->rotate_on_auto_eoi = 0; | |
272 | s->special_fully_nested_mode = 0; | |
273 | s->init4 = 0; | |
274 | } | |
275 | ||
276 | static void pic_ioport_write(void *opaque, u32 addr, u32 val) | |
277 | { | |
278 | struct kvm_kpic_state *s = opaque; | |
279 | int priority, cmd, irq; | |
280 | ||
281 | addr &= 1; | |
282 | if (addr == 0) { | |
283 | if (val & 0x10) { | |
2fcceae1 | 284 | kvm_pic_reset(s); /* init */ |
85f455f7 ED |
285 | /* |
286 | * deassert a pending interrupt | |
287 | */ | |
288 | s->pics_state->irq_request(s->pics_state-> | |
289 | irq_request_opaque, 0); | |
290 | s->init_state = 1; | |
291 | s->init4 = val & 1; | |
292 | if (val & 0x02) | |
293 | printk(KERN_ERR "single mode not supported"); | |
294 | if (val & 0x08) | |
295 | printk(KERN_ERR | |
296 | "level sensitive irq not supported"); | |
297 | } else if (val & 0x08) { | |
298 | if (val & 0x04) | |
299 | s->poll = 1; | |
300 | if (val & 0x02) | |
301 | s->read_reg_select = val & 1; | |
302 | if (val & 0x40) | |
303 | s->special_mask = (val >> 5) & 1; | |
304 | } else { | |
305 | cmd = val >> 5; | |
306 | switch (cmd) { | |
307 | case 0: | |
308 | case 4: | |
309 | s->rotate_on_auto_eoi = cmd >> 2; | |
310 | break; | |
311 | case 1: /* end of interrupt */ | |
312 | case 5: | |
313 | priority = get_priority(s, s->isr); | |
314 | if (priority != 8) { | |
315 | irq = (priority + s->priority_add) & 7; | |
7edd0ce0 | 316 | pic_clear_isr(s, irq); |
85f455f7 ED |
317 | if (cmd == 5) |
318 | s->priority_add = (irq + 1) & 7; | |
319 | pic_update_irq(s->pics_state); | |
320 | } | |
321 | break; | |
322 | case 3: | |
323 | irq = val & 7; | |
7edd0ce0 | 324 | pic_clear_isr(s, irq); |
85f455f7 ED |
325 | pic_update_irq(s->pics_state); |
326 | break; | |
327 | case 6: | |
328 | s->priority_add = (val + 1) & 7; | |
329 | pic_update_irq(s->pics_state); | |
330 | break; | |
331 | case 7: | |
332 | irq = val & 7; | |
85f455f7 | 333 | s->priority_add = (irq + 1) & 7; |
7edd0ce0 | 334 | pic_clear_isr(s, irq); |
85f455f7 ED |
335 | pic_update_irq(s->pics_state); |
336 | break; | |
337 | default: | |
338 | break; /* no operation */ | |
339 | } | |
340 | } | |
341 | } else | |
342 | switch (s->init_state) { | |
343 | case 0: /* normal mode */ | |
344 | s->imr = val; | |
345 | pic_update_irq(s->pics_state); | |
346 | break; | |
347 | case 1: | |
348 | s->irq_base = val & 0xf8; | |
349 | s->init_state = 2; | |
350 | break; | |
351 | case 2: | |
352 | if (s->init4) | |
353 | s->init_state = 3; | |
354 | else | |
355 | s->init_state = 0; | |
356 | break; | |
357 | case 3: | |
358 | s->special_fully_nested_mode = (val >> 4) & 1; | |
359 | s->auto_eoi = (val >> 1) & 1; | |
360 | s->init_state = 0; | |
361 | break; | |
362 | } | |
363 | } | |
364 | ||
365 | static u32 pic_poll_read(struct kvm_kpic_state *s, u32 addr1) | |
366 | { | |
367 | int ret; | |
368 | ||
369 | ret = pic_get_irq(s); | |
370 | if (ret >= 0) { | |
371 | if (addr1 >> 7) { | |
372 | s->pics_state->pics[0].isr &= ~(1 << 2); | |
373 | s->pics_state->pics[0].irr &= ~(1 << 2); | |
374 | } | |
375 | s->irr &= ~(1 << ret); | |
7edd0ce0 | 376 | pic_clear_isr(s, ret); |
85f455f7 ED |
377 | if (addr1 >> 7 || ret != 2) |
378 | pic_update_irq(s->pics_state); | |
379 | } else { | |
380 | ret = 0x07; | |
381 | pic_update_irq(s->pics_state); | |
382 | } | |
383 | ||
384 | return ret; | |
385 | } | |
386 | ||
387 | static u32 pic_ioport_read(void *opaque, u32 addr1) | |
388 | { | |
389 | struct kvm_kpic_state *s = opaque; | |
390 | unsigned int addr; | |
391 | int ret; | |
392 | ||
393 | addr = addr1; | |
394 | addr &= 1; | |
395 | if (s->poll) { | |
396 | ret = pic_poll_read(s, addr1); | |
397 | s->poll = 0; | |
398 | } else | |
399 | if (addr == 0) | |
400 | if (s->read_reg_select) | |
401 | ret = s->isr; | |
402 | else | |
403 | ret = s->irr; | |
404 | else | |
405 | ret = s->imr; | |
406 | return ret; | |
407 | } | |
408 | ||
409 | static void elcr_ioport_write(void *opaque, u32 addr, u32 val) | |
410 | { | |
411 | struct kvm_kpic_state *s = opaque; | |
412 | s->elcr = val & s->elcr_mask; | |
413 | } | |
414 | ||
415 | static u32 elcr_ioport_read(void *opaque, u32 addr1) | |
416 | { | |
417 | struct kvm_kpic_state *s = opaque; | |
418 | return s->elcr; | |
419 | } | |
420 | ||
92760499 LV |
421 | static int picdev_in_range(struct kvm_io_device *this, gpa_t addr, |
422 | int len, int is_write) | |
85f455f7 ED |
423 | { |
424 | switch (addr) { | |
425 | case 0x20: | |
426 | case 0x21: | |
427 | case 0xa0: | |
428 | case 0xa1: | |
429 | case 0x4d0: | |
430 | case 0x4d1: | |
431 | return 1; | |
432 | default: | |
433 | return 0; | |
434 | } | |
435 | } | |
436 | ||
437 | static void picdev_write(struct kvm_io_device *this, | |
438 | gpa_t addr, int len, const void *val) | |
439 | { | |
440 | struct kvm_pic *s = this->private; | |
441 | unsigned char data = *(unsigned char *)val; | |
442 | ||
443 | if (len != 1) { | |
444 | if (printk_ratelimit()) | |
445 | printk(KERN_ERR "PIC: non byte write\n"); | |
446 | return; | |
447 | } | |
3f353858 | 448 | pic_lock(s); |
85f455f7 ED |
449 | switch (addr) { |
450 | case 0x20: | |
451 | case 0x21: | |
452 | case 0xa0: | |
453 | case 0xa1: | |
454 | pic_ioport_write(&s->pics[addr >> 7], addr, data); | |
455 | break; | |
456 | case 0x4d0: | |
457 | case 0x4d1: | |
458 | elcr_ioport_write(&s->pics[addr & 1], addr, data); | |
459 | break; | |
460 | } | |
3f353858 | 461 | pic_unlock(s); |
85f455f7 ED |
462 | } |
463 | ||
464 | static void picdev_read(struct kvm_io_device *this, | |
465 | gpa_t addr, int len, void *val) | |
466 | { | |
467 | struct kvm_pic *s = this->private; | |
468 | unsigned char data = 0; | |
469 | ||
470 | if (len != 1) { | |
471 | if (printk_ratelimit()) | |
472 | printk(KERN_ERR "PIC: non byte read\n"); | |
473 | return; | |
474 | } | |
3f353858 | 475 | pic_lock(s); |
85f455f7 ED |
476 | switch (addr) { |
477 | case 0x20: | |
478 | case 0x21: | |
479 | case 0xa0: | |
480 | case 0xa1: | |
481 | data = pic_ioport_read(&s->pics[addr >> 7], addr); | |
482 | break; | |
483 | case 0x4d0: | |
484 | case 0x4d1: | |
485 | data = elcr_ioport_read(&s->pics[addr & 1], addr); | |
486 | break; | |
487 | } | |
488 | *(unsigned char *)val = data; | |
3f353858 | 489 | pic_unlock(s); |
85f455f7 ED |
490 | } |
491 | ||
492 | /* | |
493 | * callback when PIC0 irq status changed | |
494 | */ | |
495 | static void pic_irq_request(void *opaque, int level) | |
496 | { | |
497 | struct kvm *kvm = opaque; | |
b6958ce4 | 498 | struct kvm_vcpu *vcpu = kvm->vcpus[0]; |
e4825800 MT |
499 | struct kvm_pic *s = pic_irqchip(kvm); |
500 | int irq = pic_get_irq(&s->pics[0]); | |
85f455f7 | 501 | |
e4825800 MT |
502 | s->output = level; |
503 | if (vcpu && level && (s->pics[0].isr_ack & (1 << irq))) { | |
504 | s->pics[0].isr_ack &= ~(1 << irq); | |
3f353858 | 505 | s->wakeup_needed = true; |
e4825800 | 506 | } |
85f455f7 ED |
507 | } |
508 | ||
509 | struct kvm_pic *kvm_create_pic(struct kvm *kvm) | |
510 | { | |
511 | struct kvm_pic *s; | |
512 | s = kzalloc(sizeof(struct kvm_pic), GFP_KERNEL); | |
513 | if (!s) | |
514 | return NULL; | |
3f353858 AK |
515 | spin_lock_init(&s->lock); |
516 | s->kvm = kvm; | |
85f455f7 ED |
517 | s->pics[0].elcr_mask = 0xf8; |
518 | s->pics[1].elcr_mask = 0xde; | |
519 | s->irq_request = pic_irq_request; | |
520 | s->irq_request_opaque = kvm; | |
521 | s->pics[0].pics_state = s; | |
522 | s->pics[1].pics_state = s; | |
523 | ||
524 | /* | |
525 | * Initialize PIO device | |
526 | */ | |
527 | s->dev.read = picdev_read; | |
528 | s->dev.write = picdev_write; | |
529 | s->dev.in_range = picdev_in_range; | |
530 | s->dev.private = s; | |
531 | kvm_io_bus_register_dev(&kvm->pio_bus, &s->dev); | |
532 | return s; | |
533 | } |