This source file includes following definitions.
- mask_irq
- unmask_irq
- disable_irq
- enable_irq
- no_action
- math_error_irq
- get_irq_list
- get_smp_prof_list
- do_IRQ
- do_fast_IRQ
- request_irq
- free_irq
- probe_irq_on
- probe_irq_off
- init_IRQ
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18 #include <linux/ptrace.h>
19 #include <linux/errno.h>
20 #include <linux/kernel_stat.h>
21 #include <linux/signal.h>
22 #include <linux/sched.h>
23 #include <linux/ioport.h>
24 #include <linux/interrupt.h>
25 #include <linux/timex.h>
26 #include <linux/malloc.h>
27 #include <linux/random.h>
28
29 #include <asm/system.h>
30 #include <asm/io.h>
31 #include <asm/irq.h>
32 #include <asm/bitops.h>
33 #include <asm/smp.h>
34
35 #define CR0_NE 32
36
37 static unsigned char cache_21 = 0xff;
38 static unsigned char cache_A1 = 0xff;
39
40 #ifdef __SMP_PROF__
41 static unsigned int int_count[NR_CPUS][NR_IRQS] = {{0},};
42 #endif
43
44 static inline void mask_irq(unsigned int irq_nr)
45 {
46 unsigned char mask;
47
48 mask = 1 << (irq_nr & 7);
49 if (irq_nr < 8) {
50 cache_21 |= mask;
51 outb(cache_21,0x21);
52 } else {
53 cache_A1 |= mask;
54 outb(cache_A1,0xA1);
55 }
56 }
57
58 static inline void unmask_irq(unsigned int irq_nr)
59 {
60 unsigned char mask;
61
62 mask = ~(1 << (irq_nr & 7));
63 if (irq_nr < 8) {
64 cache_21 &= mask;
65 outb(cache_21,0x21);
66 } else {
67 cache_A1 &= mask;
68 outb(cache_A1,0xA1);
69 }
70 }
71
72 void disable_irq(unsigned int irq_nr)
73 {
74 unsigned long flags;
75
76 save_flags(flags);
77 cli();
78 mask_irq(irq_nr);
79 restore_flags(flags);
80 }
81
82 void enable_irq(unsigned int irq_nr)
83 {
84 unsigned long flags;
85 save_flags(flags);
86 cli();
87 unmask_irq(irq_nr);
88 restore_flags(flags);
89 }
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114 BUILD_TIMER_IRQ(FIRST,0,0x01)
115 BUILD_IRQ(FIRST,1,0x02)
116 BUILD_IRQ(FIRST,2,0x04)
117 BUILD_IRQ(FIRST,3,0x08)
118 BUILD_IRQ(FIRST,4,0x10)
119 BUILD_IRQ(FIRST,5,0x20)
120 BUILD_IRQ(FIRST,6,0x40)
121 BUILD_IRQ(FIRST,7,0x80)
122 BUILD_IRQ(SECOND,8,0x01)
123 BUILD_IRQ(SECOND,9,0x02)
124 BUILD_IRQ(SECOND,10,0x04)
125 BUILD_IRQ(SECOND,11,0x08)
126 BUILD_IRQ(SECOND,12,0x10)
127 #ifdef __SMP__
128 BUILD_MSGIRQ(SECOND,13,0x20)
129 #else
130 BUILD_IRQ(SECOND,13,0x20)
131 #endif
132 BUILD_IRQ(SECOND,14,0x40)
133 BUILD_IRQ(SECOND,15,0x80)
134 #ifdef __SMP__
135 BUILD_RESCHEDIRQ(16)
136 #endif
137
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139
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141
142 static void (*interrupt[17])(void) = {
143 IRQ0_interrupt, IRQ1_interrupt, IRQ2_interrupt, IRQ3_interrupt,
144 IRQ4_interrupt, IRQ5_interrupt, IRQ6_interrupt, IRQ7_interrupt,
145 IRQ8_interrupt, IRQ9_interrupt, IRQ10_interrupt, IRQ11_interrupt,
146 IRQ12_interrupt, IRQ13_interrupt, IRQ14_interrupt, IRQ15_interrupt
147 #ifdef __SMP__
148 ,IRQ16_interrupt
149 #endif
150 };
151
152 static void (*fast_interrupt[16])(void) = {
153 fast_IRQ0_interrupt, fast_IRQ1_interrupt,
154 fast_IRQ2_interrupt, fast_IRQ3_interrupt,
155 fast_IRQ4_interrupt, fast_IRQ5_interrupt,
156 fast_IRQ6_interrupt, fast_IRQ7_interrupt,
157 fast_IRQ8_interrupt, fast_IRQ9_interrupt,
158 fast_IRQ10_interrupt, fast_IRQ11_interrupt,
159 fast_IRQ12_interrupt, fast_IRQ13_interrupt,
160 fast_IRQ14_interrupt, fast_IRQ15_interrupt
161 };
162
163 static void (*bad_interrupt[16])(void) = {
164 bad_IRQ0_interrupt, bad_IRQ1_interrupt,
165 bad_IRQ2_interrupt, bad_IRQ3_interrupt,
166 bad_IRQ4_interrupt, bad_IRQ5_interrupt,
167 bad_IRQ6_interrupt, bad_IRQ7_interrupt,
168 bad_IRQ8_interrupt, bad_IRQ9_interrupt,
169 bad_IRQ10_interrupt, bad_IRQ11_interrupt,
170 bad_IRQ12_interrupt, bad_IRQ13_interrupt,
171 bad_IRQ14_interrupt, bad_IRQ15_interrupt
172 };
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178 static void no_action(int cpl, void *dev_id, struct pt_regs *regs) { }
179
180 #ifdef __SMP__
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185 static struct irqaction irq13 = { smp_message_irq, SA_INTERRUPT, 0, "IPI", NULL, NULL }:
186
187 #else
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202 static void math_error_irq(int cpl, void *dev_id, struct pt_regs *regs)
203 {
204 outb(0,0xF0);
205 if (ignore_irq13 || !hard_math)
206 return;
207 math_error();
208 }
209
210 static struct irqaction irq13 = { math_error_irq, 0, 0, "math error", NULL, NULL };
211
212 #endif
213
214
215
216
217 extern struct irqaction irq0;
218 static struct irqaction irq2 = { no_action, 0, 0, "cascade", NULL, NULL};
219
220 static struct irqaction *irq_action[16] = {
221 &irq0, NULL, &irq2, NULL,
222 NULL, NULL, NULL, NULL,
223 NULL, NULL, NULL, NULL,
224 NULL, &irq13 , NULL, NULL
225 };
226
227 int get_irq_list(char *buf)
228 {
229 int i, len = 0;
230 struct irqaction * action;
231
232 for (i = 0 ; i < 16 ; i++) {
233 action = irq_action[i];
234 if (!action)
235 continue;
236 len += sprintf(buf+len, "%2d: %8d %c %s",
237 i, kstat.interrupts[i],
238 (action->flags & SA_INTERRUPT) ? '+' : ' ',
239 action->name);
240 for (action=action->next; action; action = action->next) {
241 len += sprintf(buf+len, ",%s %s",
242 (action->flags & SA_INTERRUPT) ? " +" : "",
243 action->name);
244 }
245 len += sprintf(buf+len, "\n");
246 }
247
248
249
250 #ifdef __SMP_PROF__
251 len+=sprintf(buf+len, "IPI: %8lu received\n",
252 ipi_count);
253 #endif
254 return len;
255 }
256
257 #ifdef __SMP_PROF__
258
259 int get_smp_prof_list(char *buf) {
260 int i,j, len = 0;
261 struct irqaction * action;
262 unsigned long sum_spins = 0;
263 unsigned long sum_spins_syscall = 0;
264 unsigned long sum_spins_sys_idle = 0;
265 unsigned long sum_smp_idle_count = 0;
266
267 for (i=0;i<=smp_num_cpus;i++) {
268 sum_spins+=smp_spins[i];
269 sum_spins_syscall+=smp_spins_syscall[i];
270 sum_spins_sys_idle+=smp_spins_sys_idle[i];
271 sum_smp_idle_count+=smp_idle_count[i];
272 }
273
274 len += sprintf(buf+len,"CPUS: %10i \n",
275 0==smp_num_cpus?1:smp_num_cpus);
276 len += sprintf(buf+len," SUM ");
277 for (i=0;i<smp_num_cpus;i++)
278 len += sprintf(buf+len," P%1d ",i);
279 len += sprintf(buf+len,"\n");
280 for (i = 0 ; i < NR_IRQS ; i++) {
281 action = *(i + irq_action);
282 if (!action->handler)
283 continue;
284 len += sprintf(buf+len, "%3d: %10d ",
285 i, kstat.interrupts[i]);
286 for (j=0;j<smp_num_cpus;j++)
287 len+=sprintf(buf+len, "%10d ",int_count[j][i]);
288 len += sprintf(buf+len, "%c %s\n",
289 (action->flags & SA_INTERRUPT) ? '+' : ' ',
290 action->name);
291 for (action=action->next; action; action = action->next) {
292 len += sprintf(buf+len, ",%s %s",
293 (action->flags & SA_INTERRUPT) ? " +" : "",
294 action->name);
295 }
296 }
297 len+=sprintf(buf+len, "LCK: %10lu",
298 sum_spins);
299
300 for (i=0;i<smp_num_cpus;i++)
301 len+=sprintf(buf+len," %10lu",smp_spins[i]);
302
303 len +=sprintf(buf+len," spins from int\n");
304
305 len+=sprintf(buf+len, "LCK: %10lu",
306 sum_spins_syscall);
307
308 for (i=0;i<smp_num_cpus;i++)
309 len+=sprintf(buf+len," %10lu",smp_spins_syscall[i]);
310
311 len +=sprintf(buf+len," spins from syscall\n");
312
313 len+=sprintf(buf+len, "LCK: %10lu",
314 sum_spins_sys_idle);
315
316 for (i=0;i<smp_num_cpus;i++)
317 len+=sprintf(buf+len," %10lu",smp_spins_sys_idle[i]);
318
319 len +=sprintf(buf+len," spins from sysidle\n");
320 len+=sprintf(buf+len,"IDLE %10lu",sum_smp_idle_count);
321
322 for (i=0;i<smp_num_cpus;i++)
323 len+=sprintf(buf+len," %10lu",smp_idle_count[i]);
324
325 len +=sprintf(buf+len," idle ticks\n");
326
327 len+=sprintf(buf+len, "IPI: %10lu received\n",
328 ipi_count);
329
330 return len;
331 }
332 #endif
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342
343 asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
344 {
345 struct irqaction * action = *(irq + irq_action);
346
347 #ifdef __SMP__
348 if(smp_threads_ready && active_kernel_processor!=smp_processor_id())
349 panic("IRQ %d: active processor set wrongly(%d not %d).\n", irq, active_kernel_processor, smp_processor_id());
350 #endif
351
352 kstat.interrupts[irq]++;
353 #ifdef __SMP_PROF__
354 int_count[smp_processor_id()][irq]++;
355 #endif
356 while (action) {
357 if (action->flags & SA_SAMPLE_RANDOM)
358 add_interrupt_randomness(irq);
359 action->handler(irq, action->dev_id, regs);
360 action = action->next;
361 }
362 }
363
364
365
366
367
368
369 asmlinkage void do_fast_IRQ(int irq)
370 {
371 struct irqaction * action = *(irq + irq_action);
372 #ifdef __SMP__
373
374 if(smp_threads_ready && active_kernel_processor!=smp_processor_id() && irq!=13)
375 panic("fast_IRQ %d: active processor set wrongly(%d not %d).\n", irq, active_kernel_processor, smp_processor_id());
376 #endif
377
378 kstat.interrupts[irq]++;
379 #ifdef __SMP_PROF__
380 int_count[smp_processor_id()][irq]++;
381 #endif
382 while (action) {
383 action->handler(irq, action->dev_id, NULL);
384 action = action->next;
385 }
386 }
387
388 int request_irq(unsigned int irq,
389 void (*handler)(int, void *, struct pt_regs *),
390 unsigned long irqflags,
391 const char * devname,
392 void *dev_id)
393 {
394 int shared = 0;
395 struct irqaction * action, **p;
396 unsigned long flags;
397
398 if (irq > 15)
399 return -EINVAL;
400 if (!handler)
401 return -EINVAL;
402 p = irq_action + irq;
403 action = *p;
404 if (action) {
405
406 if (!(action->flags & irqflags & SA_SHIRQ))
407 return -EBUSY;
408
409
410 if ((action->flags ^ irqflags) & SA_INTERRUPT)
411 return -EBUSY;
412
413
414 do {
415 p = &action->next;
416 action = *p;
417 } while (action);
418 shared = 1;
419 }
420
421 action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
422 if (!action)
423 return -ENOMEM;
424
425 if (irqflags & SA_SAMPLE_RANDOM)
426 rand_initialize_irq(irq);
427
428 action->handler = handler;
429 action->flags = irqflags;
430 action->mask = 0;
431 action->name = devname;
432 action->next = NULL;
433 action->dev_id = dev_id;
434
435 save_flags(flags);
436 cli();
437 *p = action;
438
439 if (!shared) {
440 if (action->flags & SA_INTERRUPT)
441 set_intr_gate(0x20+irq,fast_interrupt[irq]);
442 else
443 set_intr_gate(0x20+irq,interrupt[irq]);
444 unmask_irq(irq);
445 }
446 restore_flags(flags);
447 return 0;
448 }
449
450 void free_irq(unsigned int irq, void *dev_id)
451 {
452 struct irqaction * action, **p;
453 unsigned long flags;
454
455 if (irq > 15) {
456 printk("Trying to free IRQ%d\n",irq);
457 return;
458 }
459 for (p = irq + irq_action; (action = *p) != NULL; p = &action->next) {
460 if (action->dev_id != dev_id)
461 continue;
462
463
464 save_flags(flags);
465 cli();
466 *p = action->next;
467 if (!irq[irq_action]) {
468 mask_irq(irq);
469 set_intr_gate(0x20+irq,bad_interrupt[irq]);
470 }
471 restore_flags(flags);
472 kfree(action);
473 return;
474 }
475 printk("Trying to free free IRQ%d\n",irq);
476 }
477
478 unsigned long probe_irq_on (void)
479 {
480 unsigned int i, irqs = 0, irqmask;
481 unsigned long delay;
482
483
484 for (i = 15; i > 0; i--) {
485 if (!irq_action[i]) {
486 enable_irq(i);
487 irqs |= (1 << i);
488 }
489 }
490
491
492 for (delay = jiffies + HZ/10; delay > jiffies; )
493 ;
494
495
496 irqmask = (((unsigned int)cache_A1)<<8) | (unsigned int)cache_21;
497 return irqs & ~irqmask;
498 }
499
500 int probe_irq_off (unsigned long irqs)
501 {
502 unsigned int i, irqmask;
503
504 irqmask = (((unsigned int)cache_A1)<<8) | (unsigned int)cache_21;
505 #ifdef DEBUG
506 printk("probe_irq_off: irqs=0x%04x irqmask=0x%04x\n", irqs, irqmask);
507 #endif
508 irqs &= irqmask;
509 if (!irqs)
510 return 0;
511 i = ffz(~irqs);
512 if (irqs != (irqs & (1 << i)))
513 i = -i;
514 return i;
515 }
516
517 void init_IRQ(void)
518 {
519 int i;
520 static unsigned char smptrap=0;
521 if(smptrap)
522 return;
523 smptrap=1;
524
525
526 outb_p(0x34,0x43);
527 outb_p(LATCH & 0xff , 0x40);
528 outb(LATCH >> 8 , 0x40);
529 for (i = 0; i < 16 ; i++)
530 set_intr_gate(0x20+i,bad_interrupt[i]);
531
532
533 #ifdef __SMP__
534 set_intr_gate(0x20+i, interrupt[i]);
535 #endif
536 request_region(0x20,0x20,"pic1");
537 request_region(0xa0,0x20,"pic2");
538 enable_irq(2);
539 enable_irq(13);
540 }