~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/parisc/kernel/irq.c

Version: ~ [ linux-5.16 ] ~ [ linux-5.15.13 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.90 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.170 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.224 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.261 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.296 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.298 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /* 
  3  * Code to handle x86 style IRQs plus some generic interrupt stuff.
  4  *
  5  * Copyright (C) 1992 Linus Torvalds
  6  * Copyright (C) 1994, 1995, 1996, 1997, 1998 Ralf Baechle
  7  * Copyright (C) 1999 SuSE GmbH (Philipp Rumpf, prumpf@tux.org)
  8  * Copyright (C) 1999-2000 Grant Grundler
  9  * Copyright (c) 2005 Matthew Wilcox
 10  */
 11 #include <linux/bitops.h>
 12 #include <linux/errno.h>
 13 #include <linux/init.h>
 14 #include <linux/interrupt.h>
 15 #include <linux/kernel_stat.h>
 16 #include <linux/seq_file.h>
 17 #include <linux/types.h>
 18 #include <asm/io.h>
 19 
 20 #include <asm/smp.h>
 21 #include <asm/ldcw.h>
 22 
 23 #undef PARISC_IRQ_CR16_COUNTS
 24 
 25 extern irqreturn_t timer_interrupt(int, void *);
 26 extern irqreturn_t ipi_interrupt(int, void *);
 27 
 28 #define EIEM_MASK(irq)       (1UL<<(CPU_IRQ_MAX - irq))
 29 
 30 /* Bits in EIEM correlate with cpu_irq_action[].
 31 ** Numbered *Big Endian*! (ie bit 0 is MSB)
 32 */
 33 static volatile unsigned long cpu_eiem = 0;
 34 
 35 /*
 36 ** local ACK bitmap ... habitually set to 1, but reset to zero
 37 ** between ->ack() and ->end() of the interrupt to prevent
 38 ** re-interruption of a processing interrupt.
 39 */
 40 static DEFINE_PER_CPU(unsigned long, local_ack_eiem) = ~0UL;
 41 
 42 static void cpu_mask_irq(struct irq_data *d)
 43 {
 44         unsigned long eirr_bit = EIEM_MASK(d->irq);
 45 
 46         cpu_eiem &= ~eirr_bit;
 47         /* Do nothing on the other CPUs.  If they get this interrupt,
 48          * The & cpu_eiem in the do_cpu_irq_mask() ensures they won't
 49          * handle it, and the set_eiem() at the bottom will ensure it
 50          * then gets disabled */
 51 }
 52 
 53 static void __cpu_unmask_irq(unsigned int irq)
 54 {
 55         unsigned long eirr_bit = EIEM_MASK(irq);
 56 
 57         cpu_eiem |= eirr_bit;
 58 
 59         /* This is just a simple NOP IPI.  But what it does is cause
 60          * all the other CPUs to do a set_eiem(cpu_eiem) at the end
 61          * of the interrupt handler */
 62         smp_send_all_nop();
 63 }
 64 
 65 static void cpu_unmask_irq(struct irq_data *d)
 66 {
 67         __cpu_unmask_irq(d->irq);
 68 }
 69 
 70 void cpu_ack_irq(struct irq_data *d)
 71 {
 72         unsigned long mask = EIEM_MASK(d->irq);
 73         int cpu = smp_processor_id();
 74 
 75         /* Clear in EIEM so we can no longer process */
 76         per_cpu(local_ack_eiem, cpu) &= ~mask;
 77 
 78         /* disable the interrupt */
 79         set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu));
 80 
 81         /* and now ack it */
 82         mtctl(mask, 23);
 83 }
 84 
 85 void cpu_eoi_irq(struct irq_data *d)
 86 {
 87         unsigned long mask = EIEM_MASK(d->irq);
 88         int cpu = smp_processor_id();
 89 
 90         /* set it in the eiems---it's no longer in process */
 91         per_cpu(local_ack_eiem, cpu) |= mask;
 92 
 93         /* enable the interrupt */
 94         set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu));
 95 }
 96 
 97 #ifdef CONFIG_SMP
 98 int cpu_check_affinity(struct irq_data *d, const struct cpumask *dest)
 99 {
100         int cpu_dest;
101 
102         /* timer and ipi have to always be received on all CPUs */
103         if (irqd_is_per_cpu(d))
104                 return -EINVAL;
105 
106         /* whatever mask they set, we just allow one CPU */
107         cpu_dest = cpumask_next_and(d->irq & (num_online_cpus()-1),
108                                         dest, cpu_online_mask);
109         if (cpu_dest >= nr_cpu_ids)
110                 cpu_dest = cpumask_first_and(dest, cpu_online_mask);
111 
112         return cpu_dest;
113 }
114 
115 static int cpu_set_affinity_irq(struct irq_data *d, const struct cpumask *dest,
116                                 bool force)
117 {
118         int cpu_dest;
119 
120         cpu_dest = cpu_check_affinity(d, dest);
121         if (cpu_dest < 0)
122                 return -1;
123 
124         cpumask_copy(irq_data_get_affinity_mask(d), dest);
125 
126         return 0;
127 }
128 #endif
129 
130 static struct irq_chip cpu_interrupt_type = {
131         .name                   = "CPU",
132         .irq_mask               = cpu_mask_irq,
133         .irq_unmask             = cpu_unmask_irq,
134         .irq_ack                = cpu_ack_irq,
135         .irq_eoi                = cpu_eoi_irq,
136 #ifdef CONFIG_SMP
137         .irq_set_affinity       = cpu_set_affinity_irq,
138 #endif
139         /* XXX: Needs to be written.  We managed without it so far, but
140          * we really ought to write it.
141          */
142         .irq_retrigger  = NULL,
143 };
144 
145 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
146 #define irq_stats(x)            (&per_cpu(irq_stat, x))
147 
148 /*
149  * /proc/interrupts printing for arch specific interrupts
150  */
151 int arch_show_interrupts(struct seq_file *p, int prec)
152 {
153         int j;
154 
155 #ifdef CONFIG_DEBUG_STACKOVERFLOW
156         seq_printf(p, "%*s: ", prec, "STK");
157         for_each_online_cpu(j)
158                 seq_printf(p, "%10u ", irq_stats(j)->kernel_stack_usage);
159         seq_puts(p, "  Kernel stack usage\n");
160 # ifdef CONFIG_IRQSTACKS
161         seq_printf(p, "%*s: ", prec, "IST");
162         for_each_online_cpu(j)
163                 seq_printf(p, "%10u ", irq_stats(j)->irq_stack_usage);
164         seq_puts(p, "  Interrupt stack usage\n");
165 # endif
166 #endif
167 #ifdef CONFIG_SMP
168         if (num_online_cpus() > 1) {
169                 seq_printf(p, "%*s: ", prec, "RES");
170                 for_each_online_cpu(j)
171                         seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
172                 seq_puts(p, "  Rescheduling interrupts\n");
173                 seq_printf(p, "%*s: ", prec, "CAL");
174                 for_each_online_cpu(j)
175                         seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
176                 seq_puts(p, "  Function call interrupts\n");
177         }
178 #endif
179         seq_printf(p, "%*s: ", prec, "UAH");
180         for_each_online_cpu(j)
181                 seq_printf(p, "%10u ", irq_stats(j)->irq_unaligned_count);
182         seq_puts(p, "  Unaligned access handler traps\n");
183         seq_printf(p, "%*s: ", prec, "FPA");
184         for_each_online_cpu(j)
185                 seq_printf(p, "%10u ", irq_stats(j)->irq_fpassist_count);
186         seq_puts(p, "  Floating point assist traps\n");
187         seq_printf(p, "%*s: ", prec, "TLB");
188         for_each_online_cpu(j)
189                 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
190         seq_puts(p, "  TLB shootdowns\n");
191         return 0;
192 }
193 
194 int show_interrupts(struct seq_file *p, void *v)
195 {
196         int i = *(loff_t *) v, j;
197         unsigned long flags;
198 
199         if (i == 0) {
200                 seq_puts(p, "    ");
201                 for_each_online_cpu(j)
202                         seq_printf(p, "       CPU%d", j);
203 
204 #ifdef PARISC_IRQ_CR16_COUNTS
205                 seq_printf(p, " [min/avg/max] (CPU cycle counts)");
206 #endif
207                 seq_putc(p, '\n');
208         }
209 
210         if (i < NR_IRQS) {
211                 struct irq_desc *desc = irq_to_desc(i);
212                 struct irqaction *action;
213 
214                 raw_spin_lock_irqsave(&desc->lock, flags);
215                 action = desc->action;
216                 if (!action)
217                         goto skip;
218                 seq_printf(p, "%3d: ", i);
219 #ifdef CONFIG_SMP
220                 for_each_online_cpu(j)
221                         seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
222 #else
223                 seq_printf(p, "%10u ", kstat_irqs(i));
224 #endif
225 
226                 seq_printf(p, " %14s", irq_desc_get_chip(desc)->name);
227 #ifndef PARISC_IRQ_CR16_COUNTS
228                 seq_printf(p, "  %s", action->name);
229 
230                 while ((action = action->next))
231                         seq_printf(p, ", %s", action->name);
232 #else
233                 for ( ;action; action = action->next) {
234                         unsigned int k, avg, min, max;
235 
236                         min = max = action->cr16_hist[0];
237 
238                         for (avg = k = 0; k < PARISC_CR16_HIST_SIZE; k++) {
239                                 int hist = action->cr16_hist[k];
240 
241                                 if (hist) {
242                                         avg += hist;
243                                 } else
244                                         break;
245 
246                                 if (hist > max) max = hist;
247                                 if (hist < min) min = hist;
248                         }
249 
250                         avg /= k;
251                         seq_printf(p, " %s[%d/%d/%d]", action->name,
252                                         min,avg,max);
253                 }
254 #endif
255 
256                 seq_putc(p, '\n');
257  skip:
258                 raw_spin_unlock_irqrestore(&desc->lock, flags);
259         }
260 
261         if (i == NR_IRQS)
262                 arch_show_interrupts(p, 3);
263 
264         return 0;
265 }
266 
267 
268 
269 /*
270 ** The following form a "set": Virtual IRQ, Transaction Address, Trans Data.
271 ** Respectively, these map to IRQ region+EIRR, Processor HPA, EIRR bit.
272 **
273 ** To use txn_XXX() interfaces, get a Virtual IRQ first.
274 ** Then use that to get the Transaction address and data.
275 */
276 
277 int cpu_claim_irq(unsigned int irq, struct irq_chip *type, void *data)
278 {
279         if (irq_has_action(irq))
280                 return -EBUSY;
281         if (irq_get_chip(irq) != &cpu_interrupt_type)
282                 return -EBUSY;
283 
284         /* for iosapic interrupts */
285         if (type) {
286                 irq_set_chip_and_handler(irq, type, handle_percpu_irq);
287                 irq_set_chip_data(irq, data);
288                 __cpu_unmask_irq(irq);
289         }
290         return 0;
291 }
292 
293 int txn_claim_irq(int irq)
294 {
295         return cpu_claim_irq(irq, NULL, NULL) ? -1 : irq;
296 }
297 
298 /*
299  * The bits_wide parameter accommodates the limitations of the HW/SW which
300  * use these bits:
301  * Legacy PA I/O (GSC/NIO): 5 bits (architected EIM register)
302  * V-class (EPIC):          6 bits
303  * N/L/A-class (iosapic):   8 bits
304  * PCI 2.2 MSI:            16 bits
305  * Some PCI devices:       32 bits (Symbios SCSI/ATM/HyperFabric)
306  *
307  * On the service provider side:
308  * o PA 1.1 (and PA2.0 narrow mode)     5-bits (width of EIR register)
309  * o PA 2.0 wide mode                   6-bits (per processor)
310  * o IA64                               8-bits (0-256 total)
311  *
312  * So a Legacy PA I/O device on a PA 2.0 box can't use all the bits supported
313  * by the processor...and the N/L-class I/O subsystem supports more bits than
314  * PA2.0 has. The first case is the problem.
315  */
316 int txn_alloc_irq(unsigned int bits_wide)
317 {
318         int irq;
319 
320         /* never return irq 0 cause that's the interval timer */
321         for (irq = CPU_IRQ_BASE + 1; irq <= CPU_IRQ_MAX; irq++) {
322                 if (cpu_claim_irq(irq, NULL, NULL) < 0)
323                         continue;
324                 if ((irq - CPU_IRQ_BASE) >= (1 << bits_wide))
325                         continue;
326                 return irq;
327         }
328 
329         /* unlikely, but be prepared */
330         return -1;
331 }
332 
333 
334 unsigned long txn_affinity_addr(unsigned int irq, int cpu)
335 {
336 #ifdef CONFIG_SMP
337         struct irq_data *d = irq_get_irq_data(irq);
338         cpumask_copy(irq_data_get_affinity_mask(d), cpumask_of(cpu));
339 #endif
340 
341         return per_cpu(cpu_data, cpu).txn_addr;
342 }
343 
344 
345 unsigned long txn_alloc_addr(unsigned int virt_irq)
346 {
347         static int next_cpu = -1;
348 
349         next_cpu++; /* assign to "next" CPU we want this bugger on */
350 
351         /* validate entry */
352         while ((next_cpu < nr_cpu_ids) &&
353                 (!per_cpu(cpu_data, next_cpu).txn_addr ||
354                  !cpu_online(next_cpu)))
355                 next_cpu++;
356 
357         if (next_cpu >= nr_cpu_ids) 
358                 next_cpu = 0;   /* nothing else, assign monarch */
359 
360         return txn_affinity_addr(virt_irq, next_cpu);
361 }
362 
363 
364 unsigned int txn_alloc_data(unsigned int virt_irq)
365 {
366         return virt_irq - CPU_IRQ_BASE;
367 }
368 
369 static inline int eirr_to_irq(unsigned long eirr)
370 {
371         int bit = fls_long(eirr);
372         return (BITS_PER_LONG - bit) + TIMER_IRQ;
373 }
374 
375 #ifdef CONFIG_IRQSTACKS
376 /*
377  * IRQ STACK - used for irq handler
378  */
379 #define IRQ_STACK_SIZE      (4096 << 3) /* 32k irq stack size */
380 
381 union irq_stack_union {
382         unsigned long stack[IRQ_STACK_SIZE/sizeof(unsigned long)];
383         volatile unsigned int slock[4];
384         volatile unsigned int lock[1];
385 };
386 
387 DEFINE_PER_CPU(union irq_stack_union, irq_stack_union) = {
388                 .slock = { 1,1,1,1 },
389         };
390 #endif
391 
392 
393 int sysctl_panic_on_stackoverflow = 1;
394 
395 static inline void stack_overflow_check(struct pt_regs *regs)
396 {
397 #ifdef CONFIG_DEBUG_STACKOVERFLOW
398         #define STACK_MARGIN    (256*6)
399 
400         /* Our stack starts directly behind the thread_info struct. */
401         unsigned long stack_start = (unsigned long) current_thread_info();
402         unsigned long sp = regs->gr[30];
403         unsigned long stack_usage;
404         unsigned int *last_usage;
405         int cpu = smp_processor_id();
406 
407         /* if sr7 != 0, we interrupted a userspace process which we do not want
408          * to check for stack overflow. We will only check the kernel stack. */
409         if (regs->sr[7])
410                 return;
411 
412         /* exit if already in panic */
413         if (sysctl_panic_on_stackoverflow < 0)
414                 return;
415 
416         /* calculate kernel stack usage */
417         stack_usage = sp - stack_start;
418 #ifdef CONFIG_IRQSTACKS
419         if (likely(stack_usage <= THREAD_SIZE))
420                 goto check_kernel_stack; /* found kernel stack */
421 
422         /* check irq stack usage */
423         stack_start = (unsigned long) &per_cpu(irq_stack_union, cpu).stack;
424         stack_usage = sp - stack_start;
425 
426         last_usage = &per_cpu(irq_stat.irq_stack_usage, cpu);
427         if (unlikely(stack_usage > *last_usage))
428                 *last_usage = stack_usage;
429 
430         if (likely(stack_usage < (IRQ_STACK_SIZE - STACK_MARGIN)))
431                 return;
432 
433         pr_emerg("stackcheck: %s will most likely overflow irq stack "
434                  "(sp:%lx, stk bottom-top:%lx-%lx)\n",
435                 current->comm, sp, stack_start, stack_start + IRQ_STACK_SIZE);
436         goto panic_check;
437 
438 check_kernel_stack:
439 #endif
440 
441         /* check kernel stack usage */
442         last_usage = &per_cpu(irq_stat.kernel_stack_usage, cpu);
443 
444         if (unlikely(stack_usage > *last_usage))
445                 *last_usage = stack_usage;
446 
447         if (likely(stack_usage < (THREAD_SIZE - STACK_MARGIN)))
448                 return;
449 
450         pr_emerg("stackcheck: %s will most likely overflow kernel stack "
451                  "(sp:%lx, stk bottom-top:%lx-%lx)\n",
452                 current->comm, sp, stack_start, stack_start + THREAD_SIZE);
453 
454 #ifdef CONFIG_IRQSTACKS
455 panic_check:
456 #endif
457         if (sysctl_panic_on_stackoverflow) {
458                 sysctl_panic_on_stackoverflow = -1; /* disable further checks */
459                 panic("low stack detected by irq handler - check messages\n");
460         }
461 #endif
462 }
463 
464 #ifdef CONFIG_IRQSTACKS
465 /* in entry.S: */
466 void call_on_stack(unsigned long p1, void *func, unsigned long new_stack);
467 
468 static void execute_on_irq_stack(void *func, unsigned long param1)
469 {
470         union irq_stack_union *union_ptr;
471         unsigned long irq_stack;
472         volatile unsigned int *irq_stack_in_use;
473 
474         union_ptr = &per_cpu(irq_stack_union, smp_processor_id());
475         irq_stack = (unsigned long) &union_ptr->stack;
476         irq_stack = ALIGN(irq_stack + sizeof(irq_stack_union.slock),
477                          64); /* align for stack frame usage */
478 
479         /* We may be called recursive. If we are already using the irq stack,
480          * just continue to use it. Use spinlocks to serialize
481          * the irq stack usage.
482          */
483         irq_stack_in_use = (volatile unsigned int *)__ldcw_align(union_ptr);
484         if (!__ldcw(irq_stack_in_use)) {
485                 void (*direct_call)(unsigned long p1) = func;
486 
487                 /* We are using the IRQ stack already.
488                  * Do direct call on current stack. */
489                 direct_call(param1);
490                 return;
491         }
492 
493         /* This is where we switch to the IRQ stack. */
494         call_on_stack(param1, func, irq_stack);
495 
496         /* free up irq stack usage. */
497         *irq_stack_in_use = 1;
498 }
499 
500 void do_softirq_own_stack(void)
501 {
502         execute_on_irq_stack(__do_softirq, 0);
503 }
504 #endif /* CONFIG_IRQSTACKS */
505 
506 /* ONLY called from entry.S:intr_extint() */
507 void do_cpu_irq_mask(struct pt_regs *regs)
508 {
509         struct pt_regs *old_regs;
510         unsigned long eirr_val;
511         int irq, cpu = smp_processor_id();
512         struct irq_data *irq_data;
513 #ifdef CONFIG_SMP
514         cpumask_t dest;
515 #endif
516 
517         old_regs = set_irq_regs(regs);
518         local_irq_disable();
519         irq_enter();
520 
521         eirr_val = mfctl(23) & cpu_eiem & per_cpu(local_ack_eiem, cpu);
522         if (!eirr_val)
523                 goto set_out;
524         irq = eirr_to_irq(eirr_val);
525 
526         irq_data = irq_get_irq_data(irq);
527 
528         /* Filter out spurious interrupts, mostly from serial port at bootup */
529         if (unlikely(!irq_desc_has_action(irq_data_to_desc(irq_data))))
530                 goto set_out;
531 
532 #ifdef CONFIG_SMP
533         cpumask_copy(&dest, irq_data_get_affinity_mask(irq_data));
534         if (irqd_is_per_cpu(irq_data) &&
535             !cpumask_test_cpu(smp_processor_id(), &dest)) {
536                 int cpu = cpumask_first(&dest);
537 
538                 printk(KERN_DEBUG "redirecting irq %d from CPU %d to %d\n",
539                        irq, smp_processor_id(), cpu);
540                 gsc_writel(irq + CPU_IRQ_BASE,
541                            per_cpu(cpu_data, cpu).hpa);
542                 goto set_out;
543         }
544 #endif
545         stack_overflow_check(regs);
546 
547 #ifdef CONFIG_IRQSTACKS
548         execute_on_irq_stack(&generic_handle_irq, irq);
549 #else
550         generic_handle_irq(irq);
551 #endif /* CONFIG_IRQSTACKS */
552 
553  out:
554         irq_exit();
555         set_irq_regs(old_regs);
556         return;
557 
558  set_out:
559         set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu));
560         goto out;
561 }
562 
563 static struct irqaction timer_action = {
564         .handler = timer_interrupt,
565         .name = "timer",
566         .flags = IRQF_TIMER | IRQF_PERCPU | IRQF_IRQPOLL,
567 };
568 
569 #ifdef CONFIG_SMP
570 static struct irqaction ipi_action = {
571         .handler = ipi_interrupt,
572         .name = "IPI",
573         .flags = IRQF_PERCPU,
574 };
575 #endif
576 
577 static void claim_cpu_irqs(void)
578 {
579         int i;
580         for (i = CPU_IRQ_BASE; i <= CPU_IRQ_MAX; i++) {
581                 irq_set_chip_and_handler(i, &cpu_interrupt_type,
582                                          handle_percpu_irq);
583         }
584 
585         irq_set_handler(TIMER_IRQ, handle_percpu_irq);
586         setup_irq(TIMER_IRQ, &timer_action);
587 #ifdef CONFIG_SMP
588         irq_set_handler(IPI_IRQ, handle_percpu_irq);
589         setup_irq(IPI_IRQ, &ipi_action);
590 #endif
591 }
592 
593 void __init init_IRQ(void)
594 {
595         local_irq_disable();    /* PARANOID - should already be disabled */
596         mtctl(~0UL, 23);        /* EIRR : clear all pending external intr */
597 #ifdef CONFIG_SMP
598         if (!cpu_eiem) {
599                 claim_cpu_irqs();
600                 cpu_eiem = EIEM_MASK(IPI_IRQ) | EIEM_MASK(TIMER_IRQ);
601         }
602 #else
603         claim_cpu_irqs();
604         cpu_eiem = EIEM_MASK(TIMER_IRQ);
605 #endif
606         set_eiem(cpu_eiem);     /* EIEM : enable all external intr */
607 }
608 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp