xref: /openbmc/linux/arch/ia64/kernel/irq_ia64.c (revision e23feb16)
1 /*
2  * linux/arch/ia64/kernel/irq_ia64.c
3  *
4  * Copyright (C) 1998-2001 Hewlett-Packard Co
5  *	Stephane Eranian <eranian@hpl.hp.com>
6  *	David Mosberger-Tang <davidm@hpl.hp.com>
7  *
8  *  6/10/99: Updated to bring in sync with x86 version to facilitate
9  *	     support for SMP and different interrupt controllers.
10  *
11  * 09/15/00 Goutham Rao <goutham.rao@intel.com> Implemented pci_irq_to_vector
12  *                      PCI to vector allocation routine.
13  * 04/14/2004 Ashok Raj <ashok.raj@intel.com>
14  *						Added CPU Hotplug handling for IPF.
15  */
16 
17 #include <linux/module.h>
18 
19 #include <linux/jiffies.h>
20 #include <linux/errno.h>
21 #include <linux/init.h>
22 #include <linux/interrupt.h>
23 #include <linux/ioport.h>
24 #include <linux/kernel_stat.h>
25 #include <linux/ptrace.h>
26 #include <linux/signal.h>
27 #include <linux/smp.h>
28 #include <linux/threads.h>
29 #include <linux/bitops.h>
30 #include <linux/irq.h>
31 #include <linux/ratelimit.h>
32 #include <linux/acpi.h>
33 #include <linux/sched.h>
34 
35 #include <asm/delay.h>
36 #include <asm/intrinsics.h>
37 #include <asm/io.h>
38 #include <asm/hw_irq.h>
39 #include <asm/machvec.h>
40 #include <asm/pgtable.h>
41 #include <asm/tlbflush.h>
42 
43 #ifdef CONFIG_PERFMON
44 # include <asm/perfmon.h>
45 #endif
46 
47 #define IRQ_DEBUG	0
48 
49 #define IRQ_VECTOR_UNASSIGNED	(0)
50 
51 #define IRQ_UNUSED		(0)
52 #define IRQ_USED		(1)
53 #define IRQ_RSVD		(2)
54 
55 /* These can be overridden in platform_irq_init */
56 int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR;
57 int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR;
58 
59 /* default base addr of IPI table */
60 void __iomem *ipi_base_addr = ((void __iomem *)
61 			       (__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR));
62 
63 static cpumask_t vector_allocation_domain(int cpu);
64 
65 /*
66  * Legacy IRQ to IA-64 vector translation table.
67  */
68 __u8 isa_irq_to_vector_map[16] = {
69 	/* 8259 IRQ translation, first 16 entries */
70 	0x2f, 0x20, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29,
71 	0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21
72 };
73 EXPORT_SYMBOL(isa_irq_to_vector_map);
74 
75 DEFINE_SPINLOCK(vector_lock);
76 
77 struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
78 	[0 ... NR_IRQS - 1] = {
79 		.vector = IRQ_VECTOR_UNASSIGNED,
80 		.domain = CPU_MASK_NONE
81 	}
82 };
83 
84 DEFINE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq) = {
85 	[0 ... IA64_NUM_VECTORS - 1] = -1
86 };
87 
88 static cpumask_t vector_table[IA64_NUM_VECTORS] = {
89 	[0 ... IA64_NUM_VECTORS - 1] = CPU_MASK_NONE
90 };
91 
92 static int irq_status[NR_IRQS] = {
93 	[0 ... NR_IRQS -1] = IRQ_UNUSED
94 };
95 
96 int check_irq_used(int irq)
97 {
98 	if (irq_status[irq] == IRQ_USED)
99 		return 1;
100 
101 	return -1;
102 }
103 
104 static inline int find_unassigned_irq(void)
105 {
106 	int irq;
107 
108 	for (irq = IA64_FIRST_DEVICE_VECTOR; irq < NR_IRQS; irq++)
109 		if (irq_status[irq] == IRQ_UNUSED)
110 			return irq;
111 	return -ENOSPC;
112 }
113 
114 static inline int find_unassigned_vector(cpumask_t domain)
115 {
116 	cpumask_t mask;
117 	int pos, vector;
118 
119 	cpumask_and(&mask, &domain, cpu_online_mask);
120 	if (cpus_empty(mask))
121 		return -EINVAL;
122 
123 	for (pos = 0; pos < IA64_NUM_DEVICE_VECTORS; pos++) {
124 		vector = IA64_FIRST_DEVICE_VECTOR + pos;
125 		cpus_and(mask, domain, vector_table[vector]);
126 		if (!cpus_empty(mask))
127 			continue;
128 		return vector;
129 	}
130 	return -ENOSPC;
131 }
132 
133 static int __bind_irq_vector(int irq, int vector, cpumask_t domain)
134 {
135 	cpumask_t mask;
136 	int cpu;
137 	struct irq_cfg *cfg = &irq_cfg[irq];
138 
139 	BUG_ON((unsigned)irq >= NR_IRQS);
140 	BUG_ON((unsigned)vector >= IA64_NUM_VECTORS);
141 
142 	cpumask_and(&mask, &domain, cpu_online_mask);
143 	if (cpus_empty(mask))
144 		return -EINVAL;
145 	if ((cfg->vector == vector) && cpus_equal(cfg->domain, domain))
146 		return 0;
147 	if (cfg->vector != IRQ_VECTOR_UNASSIGNED)
148 		return -EBUSY;
149 	for_each_cpu_mask(cpu, mask)
150 		per_cpu(vector_irq, cpu)[vector] = irq;
151 	cfg->vector = vector;
152 	cfg->domain = domain;
153 	irq_status[irq] = IRQ_USED;
154 	cpus_or(vector_table[vector], vector_table[vector], domain);
155 	return 0;
156 }
157 
158 int bind_irq_vector(int irq, int vector, cpumask_t domain)
159 {
160 	unsigned long flags;
161 	int ret;
162 
163 	spin_lock_irqsave(&vector_lock, flags);
164 	ret = __bind_irq_vector(irq, vector, domain);
165 	spin_unlock_irqrestore(&vector_lock, flags);
166 	return ret;
167 }
168 
169 static void __clear_irq_vector(int irq)
170 {
171 	int vector, cpu;
172 	cpumask_t mask;
173 	cpumask_t domain;
174 	struct irq_cfg *cfg = &irq_cfg[irq];
175 
176 	BUG_ON((unsigned)irq >= NR_IRQS);
177 	BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED);
178 	vector = cfg->vector;
179 	domain = cfg->domain;
180 	cpumask_and(&mask, &cfg->domain, cpu_online_mask);
181 	for_each_cpu_mask(cpu, mask)
182 		per_cpu(vector_irq, cpu)[vector] = -1;
183 	cfg->vector = IRQ_VECTOR_UNASSIGNED;
184 	cfg->domain = CPU_MASK_NONE;
185 	irq_status[irq] = IRQ_UNUSED;
186 	cpus_andnot(vector_table[vector], vector_table[vector], domain);
187 }
188 
189 static void clear_irq_vector(int irq)
190 {
191 	unsigned long flags;
192 
193 	spin_lock_irqsave(&vector_lock, flags);
194 	__clear_irq_vector(irq);
195 	spin_unlock_irqrestore(&vector_lock, flags);
196 }
197 
198 int
199 ia64_native_assign_irq_vector (int irq)
200 {
201 	unsigned long flags;
202 	int vector, cpu;
203 	cpumask_t domain = CPU_MASK_NONE;
204 
205 	vector = -ENOSPC;
206 
207 	spin_lock_irqsave(&vector_lock, flags);
208 	for_each_online_cpu(cpu) {
209 		domain = vector_allocation_domain(cpu);
210 		vector = find_unassigned_vector(domain);
211 		if (vector >= 0)
212 			break;
213 	}
214 	if (vector < 0)
215 		goto out;
216 	if (irq == AUTO_ASSIGN)
217 		irq = vector;
218 	BUG_ON(__bind_irq_vector(irq, vector, domain));
219  out:
220 	spin_unlock_irqrestore(&vector_lock, flags);
221 	return vector;
222 }
223 
224 void
225 ia64_native_free_irq_vector (int vector)
226 {
227 	if (vector < IA64_FIRST_DEVICE_VECTOR ||
228 	    vector > IA64_LAST_DEVICE_VECTOR)
229 		return;
230 	clear_irq_vector(vector);
231 }
232 
233 int
234 reserve_irq_vector (int vector)
235 {
236 	if (vector < IA64_FIRST_DEVICE_VECTOR ||
237 	    vector > IA64_LAST_DEVICE_VECTOR)
238 		return -EINVAL;
239 	return !!bind_irq_vector(vector, vector, CPU_MASK_ALL);
240 }
241 
242 /*
243  * Initialize vector_irq on a new cpu. This function must be called
244  * with vector_lock held.
245  */
246 void __setup_vector_irq(int cpu)
247 {
248 	int irq, vector;
249 
250 	/* Clear vector_irq */
251 	for (vector = 0; vector < IA64_NUM_VECTORS; ++vector)
252 		per_cpu(vector_irq, cpu)[vector] = -1;
253 	/* Mark the inuse vectors */
254 	for (irq = 0; irq < NR_IRQS; ++irq) {
255 		if (!cpu_isset(cpu, irq_cfg[irq].domain))
256 			continue;
257 		vector = irq_to_vector(irq);
258 		per_cpu(vector_irq, cpu)[vector] = irq;
259 	}
260 }
261 
262 #if defined(CONFIG_SMP) && (defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG))
263 
264 static enum vector_domain_type {
265 	VECTOR_DOMAIN_NONE,
266 	VECTOR_DOMAIN_PERCPU
267 } vector_domain_type = VECTOR_DOMAIN_NONE;
268 
269 static cpumask_t vector_allocation_domain(int cpu)
270 {
271 	if (vector_domain_type == VECTOR_DOMAIN_PERCPU)
272 		return cpumask_of_cpu(cpu);
273 	return CPU_MASK_ALL;
274 }
275 
276 static int __irq_prepare_move(int irq, int cpu)
277 {
278 	struct irq_cfg *cfg = &irq_cfg[irq];
279 	int vector;
280 	cpumask_t domain;
281 
282 	if (cfg->move_in_progress || cfg->move_cleanup_count)
283 		return -EBUSY;
284 	if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
285 		return -EINVAL;
286 	if (cpu_isset(cpu, cfg->domain))
287 		return 0;
288 	domain = vector_allocation_domain(cpu);
289 	vector = find_unassigned_vector(domain);
290 	if (vector < 0)
291 		return -ENOSPC;
292 	cfg->move_in_progress = 1;
293 	cfg->old_domain = cfg->domain;
294 	cfg->vector = IRQ_VECTOR_UNASSIGNED;
295 	cfg->domain = CPU_MASK_NONE;
296 	BUG_ON(__bind_irq_vector(irq, vector, domain));
297 	return 0;
298 }
299 
300 int irq_prepare_move(int irq, int cpu)
301 {
302 	unsigned long flags;
303 	int ret;
304 
305 	spin_lock_irqsave(&vector_lock, flags);
306 	ret = __irq_prepare_move(irq, cpu);
307 	spin_unlock_irqrestore(&vector_lock, flags);
308 	return ret;
309 }
310 
311 void irq_complete_move(unsigned irq)
312 {
313 	struct irq_cfg *cfg = &irq_cfg[irq];
314 	cpumask_t cleanup_mask;
315 	int i;
316 
317 	if (likely(!cfg->move_in_progress))
318 		return;
319 
320 	if (unlikely(cpu_isset(smp_processor_id(), cfg->old_domain)))
321 		return;
322 
323 	cpumask_and(&cleanup_mask, &cfg->old_domain, cpu_online_mask);
324 	cfg->move_cleanup_count = cpus_weight(cleanup_mask);
325 	for_each_cpu_mask(i, cleanup_mask)
326 		platform_send_ipi(i, IA64_IRQ_MOVE_VECTOR, IA64_IPI_DM_INT, 0);
327 	cfg->move_in_progress = 0;
328 }
329 
330 static irqreturn_t smp_irq_move_cleanup_interrupt(int irq, void *dev_id)
331 {
332 	int me = smp_processor_id();
333 	ia64_vector vector;
334 	unsigned long flags;
335 
336 	for (vector = IA64_FIRST_DEVICE_VECTOR;
337 	     vector < IA64_LAST_DEVICE_VECTOR; vector++) {
338 		int irq;
339 		struct irq_desc *desc;
340 		struct irq_cfg *cfg;
341 		irq = __get_cpu_var(vector_irq)[vector];
342 		if (irq < 0)
343 			continue;
344 
345 		desc = irq_to_desc(irq);
346 		cfg = irq_cfg + irq;
347 		raw_spin_lock(&desc->lock);
348 		if (!cfg->move_cleanup_count)
349 			goto unlock;
350 
351 		if (!cpu_isset(me, cfg->old_domain))
352 			goto unlock;
353 
354 		spin_lock_irqsave(&vector_lock, flags);
355 		__get_cpu_var(vector_irq)[vector] = -1;
356 		cpu_clear(me, vector_table[vector]);
357 		spin_unlock_irqrestore(&vector_lock, flags);
358 		cfg->move_cleanup_count--;
359 	unlock:
360 		raw_spin_unlock(&desc->lock);
361 	}
362 	return IRQ_HANDLED;
363 }
364 
365 static struct irqaction irq_move_irqaction = {
366 	.handler =	smp_irq_move_cleanup_interrupt,
367 	.flags =	IRQF_DISABLED,
368 	.name =		"irq_move"
369 };
370 
371 static int __init parse_vector_domain(char *arg)
372 {
373 	if (!arg)
374 		return -EINVAL;
375 	if (!strcmp(arg, "percpu")) {
376 		vector_domain_type = VECTOR_DOMAIN_PERCPU;
377 		no_int_routing = 1;
378 	}
379 	return 0;
380 }
381 early_param("vector", parse_vector_domain);
382 #else
383 static cpumask_t vector_allocation_domain(int cpu)
384 {
385 	return CPU_MASK_ALL;
386 }
387 #endif
388 
389 
390 void destroy_and_reserve_irq(unsigned int irq)
391 {
392 	unsigned long flags;
393 
394 	dynamic_irq_cleanup(irq);
395 
396 	spin_lock_irqsave(&vector_lock, flags);
397 	__clear_irq_vector(irq);
398 	irq_status[irq] = IRQ_RSVD;
399 	spin_unlock_irqrestore(&vector_lock, flags);
400 }
401 
402 /*
403  * Dynamic irq allocate and deallocation for MSI
404  */
405 int create_irq(void)
406 {
407 	unsigned long flags;
408 	int irq, vector, cpu;
409 	cpumask_t domain = CPU_MASK_NONE;
410 
411 	irq = vector = -ENOSPC;
412 	spin_lock_irqsave(&vector_lock, flags);
413 	for_each_online_cpu(cpu) {
414 		domain = vector_allocation_domain(cpu);
415 		vector = find_unassigned_vector(domain);
416 		if (vector >= 0)
417 			break;
418 	}
419 	if (vector < 0)
420 		goto out;
421 	irq = find_unassigned_irq();
422 	if (irq < 0)
423 		goto out;
424 	BUG_ON(__bind_irq_vector(irq, vector, domain));
425  out:
426 	spin_unlock_irqrestore(&vector_lock, flags);
427 	if (irq >= 0)
428 		dynamic_irq_init(irq);
429 	return irq;
430 }
431 
432 void destroy_irq(unsigned int irq)
433 {
434 	dynamic_irq_cleanup(irq);
435 	clear_irq_vector(irq);
436 }
437 
438 #ifdef CONFIG_SMP
439 #	define IS_RESCHEDULE(vec)	(vec == IA64_IPI_RESCHEDULE)
440 #	define IS_LOCAL_TLB_FLUSH(vec)	(vec == IA64_IPI_LOCAL_TLB_FLUSH)
441 #else
442 #	define IS_RESCHEDULE(vec)	(0)
443 #	define IS_LOCAL_TLB_FLUSH(vec)	(0)
444 #endif
445 /*
446  * That's where the IVT branches when we get an external
447  * interrupt. This branches to the correct hardware IRQ handler via
448  * function ptr.
449  */
450 void
451 ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
452 {
453 	struct pt_regs *old_regs = set_irq_regs(regs);
454 	unsigned long saved_tpr;
455 
456 #if IRQ_DEBUG
457 	{
458 		unsigned long bsp, sp;
459 
460 		/*
461 		 * Note: if the interrupt happened while executing in
462 		 * the context switch routine (ia64_switch_to), we may
463 		 * get a spurious stack overflow here.  This is
464 		 * because the register and the memory stack are not
465 		 * switched atomically.
466 		 */
467 		bsp = ia64_getreg(_IA64_REG_AR_BSP);
468 		sp = ia64_getreg(_IA64_REG_SP);
469 
470 		if ((sp - bsp) < 1024) {
471 			static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
472 
473 			if (__ratelimit(&ratelimit)) {
474 				printk("ia64_handle_irq: DANGER: less than "
475 				       "1KB of free stack space!!\n"
476 				       "(bsp=0x%lx, sp=%lx)\n", bsp, sp);
477 			}
478 		}
479 	}
480 #endif /* IRQ_DEBUG */
481 
482 	/*
483 	 * Always set TPR to limit maximum interrupt nesting depth to
484 	 * 16 (without this, it would be ~240, which could easily lead
485 	 * to kernel stack overflows).
486 	 */
487 	irq_enter();
488 	saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
489 	ia64_srlz_d();
490 	while (vector != IA64_SPURIOUS_INT_VECTOR) {
491 		int irq = local_vector_to_irq(vector);
492 		struct irq_desc *desc = irq_to_desc(irq);
493 
494 		if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
495 			smp_local_flush_tlb();
496 			kstat_incr_irqs_this_cpu(irq, desc);
497 		} else if (unlikely(IS_RESCHEDULE(vector))) {
498 			scheduler_ipi();
499 			kstat_incr_irqs_this_cpu(irq, desc);
500 		} else {
501 			ia64_setreg(_IA64_REG_CR_TPR, vector);
502 			ia64_srlz_d();
503 
504 			if (unlikely(irq < 0)) {
505 				printk(KERN_ERR "%s: Unexpected interrupt "
506 				       "vector %d on CPU %d is not mapped "
507 				       "to any IRQ!\n", __func__, vector,
508 				       smp_processor_id());
509 			} else
510 				generic_handle_irq(irq);
511 
512 			/*
513 			 * Disable interrupts and send EOI:
514 			 */
515 			local_irq_disable();
516 			ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
517 		}
518 		ia64_eoi();
519 		vector = ia64_get_ivr();
520 	}
521 	/*
522 	 * This must be done *after* the ia64_eoi().  For example, the keyboard softirq
523 	 * handler needs to be able to wait for further keyboard interrupts, which can't
524 	 * come through until ia64_eoi() has been done.
525 	 */
526 	irq_exit();
527 	set_irq_regs(old_regs);
528 }
529 
530 #ifdef CONFIG_HOTPLUG_CPU
531 /*
532  * This function emulates a interrupt processing when a cpu is about to be
533  * brought down.
534  */
535 void ia64_process_pending_intr(void)
536 {
537 	ia64_vector vector;
538 	unsigned long saved_tpr;
539 	extern unsigned int vectors_in_migration[NR_IRQS];
540 
541 	vector = ia64_get_ivr();
542 
543 	irq_enter();
544 	saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
545 	ia64_srlz_d();
546 
547 	 /*
548 	  * Perform normal interrupt style processing
549 	  */
550 	while (vector != IA64_SPURIOUS_INT_VECTOR) {
551 		int irq = local_vector_to_irq(vector);
552 		struct irq_desc *desc = irq_to_desc(irq);
553 
554 		if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
555 			smp_local_flush_tlb();
556 			kstat_incr_irqs_this_cpu(irq, desc);
557 		} else if (unlikely(IS_RESCHEDULE(vector))) {
558 			kstat_incr_irqs_this_cpu(irq, desc);
559 		} else {
560 			struct pt_regs *old_regs = set_irq_regs(NULL);
561 
562 			ia64_setreg(_IA64_REG_CR_TPR, vector);
563 			ia64_srlz_d();
564 
565 			/*
566 			 * Now try calling normal ia64_handle_irq as it would have got called
567 			 * from a real intr handler. Try passing null for pt_regs, hopefully
568 			 * it will work. I hope it works!.
569 			 * Probably could shared code.
570 			 */
571 			if (unlikely(irq < 0)) {
572 				printk(KERN_ERR "%s: Unexpected interrupt "
573 				       "vector %d on CPU %d not being mapped "
574 				       "to any IRQ!!\n", __func__, vector,
575 				       smp_processor_id());
576 			} else {
577 				vectors_in_migration[irq]=0;
578 				generic_handle_irq(irq);
579 			}
580 			set_irq_regs(old_regs);
581 
582 			/*
583 			 * Disable interrupts and send EOI
584 			 */
585 			local_irq_disable();
586 			ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
587 		}
588 		ia64_eoi();
589 		vector = ia64_get_ivr();
590 	}
591 	irq_exit();
592 }
593 #endif
594 
595 
596 #ifdef CONFIG_SMP
597 
598 static irqreturn_t dummy_handler (int irq, void *dev_id)
599 {
600 	BUG();
601 }
602 
603 static struct irqaction ipi_irqaction = {
604 	.handler =	handle_IPI,
605 	.flags =	IRQF_DISABLED,
606 	.name =		"IPI"
607 };
608 
609 /*
610  * KVM uses this interrupt to force a cpu out of guest mode
611  */
612 static struct irqaction resched_irqaction = {
613 	.handler =	dummy_handler,
614 	.flags =	IRQF_DISABLED,
615 	.name =		"resched"
616 };
617 
618 static struct irqaction tlb_irqaction = {
619 	.handler =	dummy_handler,
620 	.flags =	IRQF_DISABLED,
621 	.name =		"tlb_flush"
622 };
623 
624 #endif
625 
626 void
627 ia64_native_register_percpu_irq (ia64_vector vec, struct irqaction *action)
628 {
629 	unsigned int irq;
630 
631 	irq = vec;
632 	BUG_ON(bind_irq_vector(irq, vec, CPU_MASK_ALL));
633 	irq_set_status_flags(irq, IRQ_PER_CPU);
634 	irq_set_chip(irq, &irq_type_ia64_lsapic);
635 	if (action)
636 		setup_irq(irq, action);
637 	irq_set_handler(irq, handle_percpu_irq);
638 }
639 
640 void __init
641 ia64_native_register_ipi(void)
642 {
643 #ifdef CONFIG_SMP
644 	register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
645 	register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction);
646 	register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &tlb_irqaction);
647 #endif
648 }
649 
650 void __init
651 init_IRQ (void)
652 {
653 #ifdef CONFIG_ACPI
654 	acpi_boot_init();
655 #endif
656 	ia64_register_ipi();
657 	register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL);
658 #ifdef CONFIG_SMP
659 #if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG)
660 	if (vector_domain_type != VECTOR_DOMAIN_NONE)
661 		register_percpu_irq(IA64_IRQ_MOVE_VECTOR, &irq_move_irqaction);
662 #endif
663 #endif
664 #ifdef CONFIG_PERFMON
665 	pfm_init_percpu();
666 #endif
667 	platform_irq_init();
668 }
669 
670 void
671 ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect)
672 {
673 	void __iomem *ipi_addr;
674 	unsigned long ipi_data;
675 	unsigned long phys_cpu_id;
676 
677 	phys_cpu_id = cpu_physical_id(cpu);
678 
679 	/*
680 	 * cpu number is in 8bit ID and 8bit EID
681 	 */
682 
683 	ipi_data = (delivery_mode << 8) | (vector & 0xff);
684 	ipi_addr = ipi_base_addr + ((phys_cpu_id << 4) | ((redirect & 1) << 3));
685 
686 	writeq(ipi_data, ipi_addr);
687 }
688