2 * Intel IO-APIC support for multi-Pentium hosts.
4 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
6 * Many thanks to Stig Venaas for trying out countless experimental
7 * patches and reporting/debugging problems patiently!
9 * (c) 1999, Multiple IO-APIC support, developed by
10 * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
11 * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
12 * further tested and cleaned up by Zach Brown <zab@redhat.com>
13 * and Ingo Molnar <mingo@redhat.com>
16 * Maciej W. Rozycki : Bits for genuine 82489DX APICs;
17 * thanks to Eric Gilmore
19 * for testing these extensively
20 * Paul Diefenbaugh : Added full ACPI support
24 #include <linux/interrupt.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/sched.h>
28 #include <linux/pci.h>
29 #include <linux/mc146818rtc.h>
30 #include <linux/acpi.h>
31 #include <linux/sysdev.h>
32 #include <linux/msi.h>
33 #include <linux/htirq.h>
34 #include <linux/dmar.h>
35 #include <linux/jiffies.h>
37 #include <acpi/acpi_bus.h>
39 #include <linux/bootmem.h>
45 #include <asm/proto.h>
49 #include <asm/msidef.h>
50 #include <asm/hypertransport.h>
53 #include <mach_apic.h>
58 unsigned move_cleanup_count
;
60 u8 move_in_progress
: 1;
63 /* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
64 struct irq_cfg irq_cfg
[NR_IRQS
] __read_mostly
= {
65 [0] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ0_VECTOR
, },
66 [1] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ1_VECTOR
, },
67 [2] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ2_VECTOR
, },
68 [3] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ3_VECTOR
, },
69 [4] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ4_VECTOR
, },
70 [5] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ5_VECTOR
, },
71 [6] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ6_VECTOR
, },
72 [7] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ7_VECTOR
, },
73 [8] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ8_VECTOR
, },
74 [9] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ9_VECTOR
, },
75 [10] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ10_VECTOR
, },
76 [11] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ11_VECTOR
, },
77 [12] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ12_VECTOR
, },
78 [13] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ13_VECTOR
, },
79 [14] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ14_VECTOR
, },
80 [15] = { .domain
= CPU_MASK_ALL
, .vector
= IRQ15_VECTOR
, },
83 static int assign_irq_vector(int irq
, cpumask_t mask
);
85 #define __apicdebuginit __init
87 int sis_apic_bug
; /* not actually supported, dummy for compile */
89 static int no_timer_check
;
91 static int disable_timer_pin_1 __initdata
;
93 int timer_over_8254 __initdata
= 1;
95 /* Where if anywhere is the i8259 connect in external int mode */
96 static struct { int pin
, apic
; } ioapic_i8259
= { -1, -1 };
98 static DEFINE_SPINLOCK(ioapic_lock
);
99 DEFINE_SPINLOCK(vector_lock
);
102 * # of IRQ routing registers
104 int nr_ioapic_registers
[MAX_IO_APICS
];
106 /* I/O APIC entries */
107 struct mpc_config_ioapic mp_ioapics
[MAX_IO_APICS
];
110 /* MP IRQ source entries */
111 struct mpc_config_intsrc mp_irqs
[MAX_IRQ_SOURCES
];
113 /* # of MP IRQ source entries */
117 * Rough estimation of how many shared IRQs there are, can
118 * be changed anytime.
120 #define MAX_PLUS_SHARED_IRQS NR_IRQS
121 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
124 * This is performance-critical, we want to do it O(1)
126 * the indexing order of this array favors 1:1 mappings
127 * between pins and IRQs.
130 static struct irq_pin_list
{
131 short apic
, pin
, next
;
132 } irq_2_pin
[PIN_MAP_SIZE
];
136 unsigned int unused
[3];
140 static __attribute_const__
struct io_apic __iomem
*io_apic_base(int idx
)
142 return (void __iomem
*) __fix_to_virt(FIX_IO_APIC_BASE_0
+ idx
)
143 + (mp_ioapics
[idx
].mpc_apicaddr
& ~PAGE_MASK
);
146 static inline unsigned int io_apic_read(unsigned int apic
, unsigned int reg
)
148 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
149 writel(reg
, &io_apic
->index
);
150 return readl(&io_apic
->data
);
153 static inline void io_apic_write(unsigned int apic
, unsigned int reg
, unsigned int value
)
155 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
156 writel(reg
, &io_apic
->index
);
157 writel(value
, &io_apic
->data
);
161 * Re-write a value: to be used for read-modify-write
162 * cycles where the read already set up the index register.
164 static inline void io_apic_modify(unsigned int apic
, unsigned int value
)
166 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
167 writel(value
, &io_apic
->data
);
170 static bool io_apic_level_ack_pending(unsigned int irq
)
172 struct irq_pin_list
*entry
;
175 spin_lock_irqsave(&ioapic_lock
, flags
);
176 entry
= irq_2_pin
+ irq
;
184 reg
= io_apic_read(entry
->apic
, 0x10 + pin
*2);
185 /* Is the remote IRR bit set? */
186 if ((reg
>> 14) & 1) {
187 spin_unlock_irqrestore(&ioapic_lock
, flags
);
192 entry
= irq_2_pin
+ entry
->next
;
194 spin_unlock_irqrestore(&ioapic_lock
, flags
);
200 * Synchronize the IO-APIC and the CPU by doing
201 * a dummy read from the IO-APIC
203 static inline void io_apic_sync(unsigned int apic
)
205 struct io_apic __iomem
*io_apic
= io_apic_base(apic
);
206 readl(&io_apic
->data
);
209 #define __DO_ACTION(R, ACTION, FINAL) \
213 struct irq_pin_list *entry = irq_2_pin + irq; \
215 BUG_ON(irq >= NR_IRQS); \
221 reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
223 io_apic_modify(entry->apic, reg); \
227 entry = irq_2_pin + entry->next; \
232 struct { u32 w1
, w2
; };
233 struct IO_APIC_route_entry entry
;
236 static struct IO_APIC_route_entry
ioapic_read_entry(int apic
, int pin
)
238 union entry_union eu
;
240 spin_lock_irqsave(&ioapic_lock
, flags
);
241 eu
.w1
= io_apic_read(apic
, 0x10 + 2 * pin
);
242 eu
.w2
= io_apic_read(apic
, 0x11 + 2 * pin
);
243 spin_unlock_irqrestore(&ioapic_lock
, flags
);
248 * When we write a new IO APIC routing entry, we need to write the high
249 * word first! If the mask bit in the low word is clear, we will enable
250 * the interrupt, and we need to make sure the entry is fully populated
251 * before that happens.
254 __ioapic_write_entry(int apic
, int pin
, struct IO_APIC_route_entry e
)
256 union entry_union eu
;
258 io_apic_write(apic
, 0x11 + 2*pin
, eu
.w2
);
259 io_apic_write(apic
, 0x10 + 2*pin
, eu
.w1
);
262 static void ioapic_write_entry(int apic
, int pin
, struct IO_APIC_route_entry e
)
265 spin_lock_irqsave(&ioapic_lock
, flags
);
266 __ioapic_write_entry(apic
, pin
, e
);
267 spin_unlock_irqrestore(&ioapic_lock
, flags
);
271 * When we mask an IO APIC routing entry, we need to write the low
272 * word first, in order to set the mask bit before we change the
275 static void ioapic_mask_entry(int apic
, int pin
)
278 union entry_union eu
= { .entry
.mask
= 1 };
280 spin_lock_irqsave(&ioapic_lock
, flags
);
281 io_apic_write(apic
, 0x10 + 2*pin
, eu
.w1
);
282 io_apic_write(apic
, 0x11 + 2*pin
, eu
.w2
);
283 spin_unlock_irqrestore(&ioapic_lock
, flags
);
287 static void __target_IO_APIC_irq(unsigned int irq
, unsigned int dest
, u8 vector
)
290 struct irq_pin_list
*entry
= irq_2_pin
+ irq
;
292 BUG_ON(irq
>= NR_IRQS
);
299 io_apic_write(apic
, 0x11 + pin
*2, dest
);
300 reg
= io_apic_read(apic
, 0x10 + pin
*2);
303 io_apic_modify(apic
, reg
);
306 entry
= irq_2_pin
+ entry
->next
;
310 static void set_ioapic_affinity_irq(unsigned int irq
, cpumask_t mask
)
312 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
317 cpus_and(tmp
, mask
, cpu_online_map
);
321 if (assign_irq_vector(irq
, mask
))
324 cpus_and(tmp
, cfg
->domain
, mask
);
325 dest
= cpu_mask_to_apicid(tmp
);
328 * Only the high 8 bits are valid.
330 dest
= SET_APIC_LOGICAL_ID(dest
);
332 spin_lock_irqsave(&ioapic_lock
, flags
);
333 __target_IO_APIC_irq(irq
, dest
, cfg
->vector
);
334 irq_desc
[irq
].affinity
= mask
;
335 spin_unlock_irqrestore(&ioapic_lock
, flags
);
340 * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
341 * shared ISA-space IRQs, so we have to support them. We are super
342 * fast in the common case, and fast for shared ISA-space IRQs.
344 static void add_pin_to_irq(unsigned int irq
, int apic
, int pin
)
346 static int first_free_entry
= NR_IRQS
;
347 struct irq_pin_list
*entry
= irq_2_pin
+ irq
;
349 BUG_ON(irq
>= NR_IRQS
);
351 entry
= irq_2_pin
+ entry
->next
;
353 if (entry
->pin
!= -1) {
354 entry
->next
= first_free_entry
;
355 entry
= irq_2_pin
+ entry
->next
;
356 if (++first_free_entry
>= PIN_MAP_SIZE
)
357 panic("io_apic.c: ran out of irq_2_pin entries!");
364 #define DO_ACTION(name,R,ACTION, FINAL) \
366 static void name##_IO_APIC_irq (unsigned int irq) \
367 __DO_ACTION(R, ACTION, FINAL)
369 DO_ACTION( __mask
, 0, |= 0x00010000, io_apic_sync(entry
->apic
) )
371 DO_ACTION( __unmask
, 0, &= 0xfffeffff, )
374 static void mask_IO_APIC_irq (unsigned int irq
)
378 spin_lock_irqsave(&ioapic_lock
, flags
);
379 __mask_IO_APIC_irq(irq
);
380 spin_unlock_irqrestore(&ioapic_lock
, flags
);
383 static void unmask_IO_APIC_irq (unsigned int irq
)
387 spin_lock_irqsave(&ioapic_lock
, flags
);
388 __unmask_IO_APIC_irq(irq
);
389 spin_unlock_irqrestore(&ioapic_lock
, flags
);
392 static void clear_IO_APIC_pin(unsigned int apic
, unsigned int pin
)
394 struct IO_APIC_route_entry entry
;
396 /* Check delivery_mode to be sure we're not clearing an SMI pin */
397 entry
= ioapic_read_entry(apic
, pin
);
398 if (entry
.delivery_mode
== dest_SMI
)
401 * Disable it in the IO-APIC irq-routing table:
403 ioapic_mask_entry(apic
, pin
);
406 static void clear_IO_APIC (void)
410 for (apic
= 0; apic
< nr_ioapics
; apic
++)
411 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++)
412 clear_IO_APIC_pin(apic
, pin
);
415 int skip_ioapic_setup
;
418 static int __init
parse_noapic(char *str
)
420 disable_ioapic_setup();
423 early_param("noapic", parse_noapic
);
425 /* Actually the next is obsolete, but keep it for paranoid reasons -AK */
426 static int __init
disable_timer_pin_setup(char *arg
)
428 disable_timer_pin_1
= 1;
431 __setup("disable_timer_pin_1", disable_timer_pin_setup
);
433 static int __init
setup_disable_8254_timer(char *s
)
435 timer_over_8254
= -1;
438 static int __init
setup_enable_8254_timer(char *s
)
444 __setup("disable_8254_timer", setup_disable_8254_timer
);
445 __setup("enable_8254_timer", setup_enable_8254_timer
);
449 * Find the IRQ entry number of a certain pin.
451 static int find_irq_entry(int apic
, int pin
, int type
)
455 for (i
= 0; i
< mp_irq_entries
; i
++)
456 if (mp_irqs
[i
].mpc_irqtype
== type
&&
457 (mp_irqs
[i
].mpc_dstapic
== mp_ioapics
[apic
].mpc_apicid
||
458 mp_irqs
[i
].mpc_dstapic
== MP_APIC_ALL
) &&
459 mp_irqs
[i
].mpc_dstirq
== pin
)
466 * Find the pin to which IRQ[irq] (ISA) is connected
468 static int __init
find_isa_irq_pin(int irq
, int type
)
472 for (i
= 0; i
< mp_irq_entries
; i
++) {
473 int lbus
= mp_irqs
[i
].mpc_srcbus
;
475 if (test_bit(lbus
, mp_bus_not_pci
) &&
476 (mp_irqs
[i
].mpc_irqtype
== type
) &&
477 (mp_irqs
[i
].mpc_srcbusirq
== irq
))
479 return mp_irqs
[i
].mpc_dstirq
;
484 static int __init
find_isa_irq_apic(int irq
, int type
)
488 for (i
= 0; i
< mp_irq_entries
; i
++) {
489 int lbus
= mp_irqs
[i
].mpc_srcbus
;
491 if (test_bit(lbus
, mp_bus_not_pci
) &&
492 (mp_irqs
[i
].mpc_irqtype
== type
) &&
493 (mp_irqs
[i
].mpc_srcbusirq
== irq
))
496 if (i
< mp_irq_entries
) {
498 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
499 if (mp_ioapics
[apic
].mpc_apicid
== mp_irqs
[i
].mpc_dstapic
)
508 * Find a specific PCI IRQ entry.
509 * Not an __init, possibly needed by modules
511 static int pin_2_irq(int idx
, int apic
, int pin
);
513 int IO_APIC_get_PCI_irq_vector(int bus
, int slot
, int pin
)
515 int apic
, i
, best_guess
= -1;
517 apic_printk(APIC_DEBUG
, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
519 if (mp_bus_id_to_pci_bus
[bus
] == -1) {
520 apic_printk(APIC_VERBOSE
, "PCI BIOS passed nonexistent PCI bus %d!\n", bus
);
523 for (i
= 0; i
< mp_irq_entries
; i
++) {
524 int lbus
= mp_irqs
[i
].mpc_srcbus
;
526 for (apic
= 0; apic
< nr_ioapics
; apic
++)
527 if (mp_ioapics
[apic
].mpc_apicid
== mp_irqs
[i
].mpc_dstapic
||
528 mp_irqs
[i
].mpc_dstapic
== MP_APIC_ALL
)
531 if (!test_bit(lbus
, mp_bus_not_pci
) &&
532 !mp_irqs
[i
].mpc_irqtype
&&
534 (slot
== ((mp_irqs
[i
].mpc_srcbusirq
>> 2) & 0x1f))) {
535 int irq
= pin_2_irq(i
,apic
,mp_irqs
[i
].mpc_dstirq
);
537 if (!(apic
|| IO_APIC_IRQ(irq
)))
540 if (pin
== (mp_irqs
[i
].mpc_srcbusirq
& 3))
543 * Use the first all-but-pin matching entry as a
544 * best-guess fuzzy result for broken mptables.
550 BUG_ON(best_guess
>= NR_IRQS
);
554 /* ISA interrupts are always polarity zero edge triggered,
555 * when listed as conforming in the MP table. */
557 #define default_ISA_trigger(idx) (0)
558 #define default_ISA_polarity(idx) (0)
560 /* PCI interrupts are always polarity one level triggered,
561 * when listed as conforming in the MP table. */
563 #define default_PCI_trigger(idx) (1)
564 #define default_PCI_polarity(idx) (1)
566 static int MPBIOS_polarity(int idx
)
568 int bus
= mp_irqs
[idx
].mpc_srcbus
;
572 * Determine IRQ line polarity (high active or low active):
574 switch (mp_irqs
[idx
].mpc_irqflag
& 3)
576 case 0: /* conforms, ie. bus-type dependent polarity */
577 if (test_bit(bus
, mp_bus_not_pci
))
578 polarity
= default_ISA_polarity(idx
);
580 polarity
= default_PCI_polarity(idx
);
582 case 1: /* high active */
587 case 2: /* reserved */
589 printk(KERN_WARNING
"broken BIOS!!\n");
593 case 3: /* low active */
598 default: /* invalid */
600 printk(KERN_WARNING
"broken BIOS!!\n");
608 static int MPBIOS_trigger(int idx
)
610 int bus
= mp_irqs
[idx
].mpc_srcbus
;
614 * Determine IRQ trigger mode (edge or level sensitive):
616 switch ((mp_irqs
[idx
].mpc_irqflag
>>2) & 3)
618 case 0: /* conforms, ie. bus-type dependent */
619 if (test_bit(bus
, mp_bus_not_pci
))
620 trigger
= default_ISA_trigger(idx
);
622 trigger
= default_PCI_trigger(idx
);
629 case 2: /* reserved */
631 printk(KERN_WARNING
"broken BIOS!!\n");
640 default: /* invalid */
642 printk(KERN_WARNING
"broken BIOS!!\n");
650 static inline int irq_polarity(int idx
)
652 return MPBIOS_polarity(idx
);
655 static inline int irq_trigger(int idx
)
657 return MPBIOS_trigger(idx
);
660 static int pin_2_irq(int idx
, int apic
, int pin
)
663 int bus
= mp_irqs
[idx
].mpc_srcbus
;
666 * Debugging check, we are in big trouble if this message pops up!
668 if (mp_irqs
[idx
].mpc_dstirq
!= pin
)
669 printk(KERN_ERR
"broken BIOS or MPTABLE parser, ayiee!!\n");
671 if (test_bit(bus
, mp_bus_not_pci
)) {
672 irq
= mp_irqs
[idx
].mpc_srcbusirq
;
675 * PCI IRQs are mapped in order
679 irq
+= nr_ioapic_registers
[i
++];
682 BUG_ON(irq
>= NR_IRQS
);
686 static int __assign_irq_vector(int irq
, cpumask_t mask
)
689 * NOTE! The local APIC isn't very good at handling
690 * multiple interrupts at the same interrupt level.
691 * As the interrupt level is determined by taking the
692 * vector number and shifting that right by 4, we
693 * want to spread these out a bit so that they don't
694 * all fall in the same interrupt level.
696 * Also, we've got to be careful not to trash gate
697 * 0x80, because int 0x80 is hm, kind of importantish. ;)
699 static int current_vector
= FIRST_DEVICE_VECTOR
, current_offset
= 0;
700 unsigned int old_vector
;
704 BUG_ON((unsigned)irq
>= NR_IRQS
);
707 /* Only try and allocate irqs on cpus that are present */
708 cpus_and(mask
, mask
, cpu_online_map
);
710 if ((cfg
->move_in_progress
) || cfg
->move_cleanup_count
)
713 old_vector
= cfg
->vector
;
716 cpus_and(tmp
, cfg
->domain
, mask
);
717 if (!cpus_empty(tmp
))
721 for_each_cpu_mask(cpu
, mask
) {
722 cpumask_t domain
, new_mask
;
726 domain
= vector_allocation_domain(cpu
);
727 cpus_and(new_mask
, domain
, cpu_online_map
);
729 vector
= current_vector
;
730 offset
= current_offset
;
733 if (vector
>= FIRST_SYSTEM_VECTOR
) {
734 /* If we run out of vectors on large boxen, must share them. */
735 offset
= (offset
+ 1) % 8;
736 vector
= FIRST_DEVICE_VECTOR
+ offset
;
738 if (unlikely(current_vector
== vector
))
740 if (vector
== IA32_SYSCALL_VECTOR
)
742 for_each_cpu_mask(new_cpu
, new_mask
)
743 if (per_cpu(vector_irq
, new_cpu
)[vector
] != -1)
746 current_vector
= vector
;
747 current_offset
= offset
;
749 cfg
->move_in_progress
= 1;
750 cfg
->old_domain
= cfg
->domain
;
752 for_each_cpu_mask(new_cpu
, new_mask
)
753 per_cpu(vector_irq
, new_cpu
)[vector
] = irq
;
754 cfg
->vector
= vector
;
755 cfg
->domain
= domain
;
761 static int assign_irq_vector(int irq
, cpumask_t mask
)
766 spin_lock_irqsave(&vector_lock
, flags
);
767 err
= __assign_irq_vector(irq
, mask
);
768 spin_unlock_irqrestore(&vector_lock
, flags
);
772 static void __clear_irq_vector(int irq
)
778 BUG_ON((unsigned)irq
>= NR_IRQS
);
780 BUG_ON(!cfg
->vector
);
782 vector
= cfg
->vector
;
783 cpus_and(mask
, cfg
->domain
, cpu_online_map
);
784 for_each_cpu_mask(cpu
, mask
)
785 per_cpu(vector_irq
, cpu
)[vector
] = -1;
788 cfg
->domain
= CPU_MASK_NONE
;
791 void __setup_vector_irq(int cpu
)
793 /* Initialize vector_irq on a new cpu */
794 /* This function must be called with vector_lock held */
797 /* Mark the inuse vectors */
798 for (irq
= 0; irq
< NR_IRQS
; ++irq
) {
799 if (!cpu_isset(cpu
, irq_cfg
[irq
].domain
))
801 vector
= irq_cfg
[irq
].vector
;
802 per_cpu(vector_irq
, cpu
)[vector
] = irq
;
804 /* Mark the free vectors */
805 for (vector
= 0; vector
< NR_VECTORS
; ++vector
) {
806 irq
= per_cpu(vector_irq
, cpu
)[vector
];
809 if (!cpu_isset(cpu
, irq_cfg
[irq
].domain
))
810 per_cpu(vector_irq
, cpu
)[vector
] = -1;
815 static struct irq_chip ioapic_chip
;
817 static void ioapic_register_intr(int irq
, unsigned long trigger
)
820 irq_desc
[irq
].status
|= IRQ_LEVEL
;
821 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
822 handle_fasteoi_irq
, "fasteoi");
824 irq_desc
[irq
].status
&= ~IRQ_LEVEL
;
825 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
826 handle_edge_irq
, "edge");
830 static void setup_IO_APIC_irq(int apic
, int pin
, unsigned int irq
,
831 int trigger
, int polarity
)
833 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
834 struct IO_APIC_route_entry entry
;
837 if (!IO_APIC_IRQ(irq
))
841 if (assign_irq_vector(irq
, mask
))
844 cpus_and(mask
, cfg
->domain
, mask
);
846 apic_printk(APIC_VERBOSE
,KERN_DEBUG
847 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
848 "IRQ %d Mode:%i Active:%i)\n",
849 apic
, mp_ioapics
[apic
].mpc_apicid
, pin
, cfg
->vector
,
850 irq
, trigger
, polarity
);
853 * add it to the IO-APIC irq-routing table:
855 memset(&entry
,0,sizeof(entry
));
857 entry
.delivery_mode
= INT_DELIVERY_MODE
;
858 entry
.dest_mode
= INT_DEST_MODE
;
859 entry
.dest
= cpu_mask_to_apicid(mask
);
860 entry
.mask
= 0; /* enable IRQ */
861 entry
.trigger
= trigger
;
862 entry
.polarity
= polarity
;
863 entry
.vector
= cfg
->vector
;
865 /* Mask level triggered irqs.
866 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
871 ioapic_register_intr(irq
, trigger
);
873 disable_8259A_irq(irq
);
875 ioapic_write_entry(apic
, pin
, entry
);
878 static void __init
setup_IO_APIC_irqs(void)
880 int apic
, pin
, idx
, irq
, first_notcon
= 1;
882 apic_printk(APIC_VERBOSE
, KERN_DEBUG
"init IO_APIC IRQs\n");
884 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
885 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
887 idx
= find_irq_entry(apic
,pin
,mp_INT
);
890 apic_printk(APIC_VERBOSE
, KERN_DEBUG
" IO-APIC (apicid-pin) %d-%d", mp_ioapics
[apic
].mpc_apicid
, pin
);
893 apic_printk(APIC_VERBOSE
, ", %d-%d", mp_ioapics
[apic
].mpc_apicid
, pin
);
897 apic_printk(APIC_VERBOSE
, " not connected.\n");
901 irq
= pin_2_irq(idx
, apic
, pin
);
902 add_pin_to_irq(irq
, apic
, pin
);
904 setup_IO_APIC_irq(apic
, pin
, irq
,
905 irq_trigger(idx
), irq_polarity(idx
));
910 apic_printk(APIC_VERBOSE
, " not connected.\n");
914 * Set up the 8259A-master output pin as broadcast to all
917 static void __init
setup_ExtINT_IRQ0_pin(unsigned int apic
, unsigned int pin
, int vector
)
919 struct IO_APIC_route_entry entry
;
921 memset(&entry
, 0, sizeof(entry
));
923 disable_8259A_irq(0);
926 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_EXTINT
);
929 * We use logical delivery to get the timer IRQ
932 entry
.dest_mode
= INT_DEST_MODE
;
933 entry
.mask
= 0; /* unmask IRQ now */
934 entry
.dest
= cpu_mask_to_apicid(TARGET_CPUS
);
935 entry
.delivery_mode
= INT_DELIVERY_MODE
;
938 entry
.vector
= vector
;
941 * The timer IRQ doesn't have to know that behind the
942 * scene we have a 8259A-master in AEOI mode ...
944 set_irq_chip_and_handler_name(0, &ioapic_chip
, handle_edge_irq
, "edge");
947 * Add it to the IO-APIC irq-routing table:
949 ioapic_write_entry(apic
, pin
, entry
);
954 void __apicdebuginit
print_IO_APIC(void)
957 union IO_APIC_reg_00 reg_00
;
958 union IO_APIC_reg_01 reg_01
;
959 union IO_APIC_reg_02 reg_02
;
962 if (apic_verbosity
== APIC_QUIET
)
965 printk(KERN_DEBUG
"number of MP IRQ sources: %d.\n", mp_irq_entries
);
966 for (i
= 0; i
< nr_ioapics
; i
++)
967 printk(KERN_DEBUG
"number of IO-APIC #%d registers: %d.\n",
968 mp_ioapics
[i
].mpc_apicid
, nr_ioapic_registers
[i
]);
971 * We are a bit conservative about what we expect. We have to
972 * know about every hardware change ASAP.
974 printk(KERN_INFO
"testing the IO APIC.......................\n");
976 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
978 spin_lock_irqsave(&ioapic_lock
, flags
);
979 reg_00
.raw
= io_apic_read(apic
, 0);
980 reg_01
.raw
= io_apic_read(apic
, 1);
981 if (reg_01
.bits
.version
>= 0x10)
982 reg_02
.raw
= io_apic_read(apic
, 2);
983 spin_unlock_irqrestore(&ioapic_lock
, flags
);
986 printk(KERN_DEBUG
"IO APIC #%d......\n", mp_ioapics
[apic
].mpc_apicid
);
987 printk(KERN_DEBUG
".... register #00: %08X\n", reg_00
.raw
);
988 printk(KERN_DEBUG
"....... : physical APIC id: %02X\n", reg_00
.bits
.ID
);
990 printk(KERN_DEBUG
".... register #01: %08X\n", *(int *)®_01
);
991 printk(KERN_DEBUG
"....... : max redirection entries: %04X\n", reg_01
.bits
.entries
);
993 printk(KERN_DEBUG
"....... : PRQ implemented: %X\n", reg_01
.bits
.PRQ
);
994 printk(KERN_DEBUG
"....... : IO APIC version: %04X\n", reg_01
.bits
.version
);
996 if (reg_01
.bits
.version
>= 0x10) {
997 printk(KERN_DEBUG
".... register #02: %08X\n", reg_02
.raw
);
998 printk(KERN_DEBUG
"....... : arbitration: %02X\n", reg_02
.bits
.arbitration
);
1001 printk(KERN_DEBUG
".... IRQ redirection table:\n");
1003 printk(KERN_DEBUG
" NR Dst Mask Trig IRR Pol"
1004 " Stat Dmod Deli Vect: \n");
1006 for (i
= 0; i
<= reg_01
.bits
.entries
; i
++) {
1007 struct IO_APIC_route_entry entry
;
1009 entry
= ioapic_read_entry(apic
, i
);
1011 printk(KERN_DEBUG
" %02x %03X ",
1016 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1021 entry
.delivery_status
,
1023 entry
.delivery_mode
,
1028 printk(KERN_DEBUG
"IRQ to pin mappings:\n");
1029 for (i
= 0; i
< NR_IRQS
; i
++) {
1030 struct irq_pin_list
*entry
= irq_2_pin
+ i
;
1033 printk(KERN_DEBUG
"IRQ%d ", i
);
1035 printk("-> %d:%d", entry
->apic
, entry
->pin
);
1038 entry
= irq_2_pin
+ entry
->next
;
1043 printk(KERN_INFO
".................................... done.\n");
1050 static __apicdebuginit
void print_APIC_bitfield (int base
)
1055 if (apic_verbosity
== APIC_QUIET
)
1058 printk(KERN_DEBUG
"0123456789abcdef0123456789abcdef\n" KERN_DEBUG
);
1059 for (i
= 0; i
< 8; i
++) {
1060 v
= apic_read(base
+ i
*0x10);
1061 for (j
= 0; j
< 32; j
++) {
1071 void __apicdebuginit
print_local_APIC(void * dummy
)
1073 unsigned int v
, ver
, maxlvt
;
1075 if (apic_verbosity
== APIC_QUIET
)
1078 printk("\n" KERN_DEBUG
"printing local APIC contents on CPU#%d/%d:\n",
1079 smp_processor_id(), hard_smp_processor_id());
1080 printk(KERN_INFO
"... APIC ID: %08x (%01x)\n", v
, GET_APIC_ID(read_apic_id()));
1081 v
= apic_read(APIC_LVR
);
1082 printk(KERN_INFO
"... APIC VERSION: %08x\n", v
);
1083 ver
= GET_APIC_VERSION(v
);
1084 maxlvt
= lapic_get_maxlvt();
1086 v
= apic_read(APIC_TASKPRI
);
1087 printk(KERN_DEBUG
"... APIC TASKPRI: %08x (%02x)\n", v
, v
& APIC_TPRI_MASK
);
1089 v
= apic_read(APIC_ARBPRI
);
1090 printk(KERN_DEBUG
"... APIC ARBPRI: %08x (%02x)\n", v
,
1091 v
& APIC_ARBPRI_MASK
);
1092 v
= apic_read(APIC_PROCPRI
);
1093 printk(KERN_DEBUG
"... APIC PROCPRI: %08x\n", v
);
1095 v
= apic_read(APIC_EOI
);
1096 printk(KERN_DEBUG
"... APIC EOI: %08x\n", v
);
1097 v
= apic_read(APIC_RRR
);
1098 printk(KERN_DEBUG
"... APIC RRR: %08x\n", v
);
1099 v
= apic_read(APIC_LDR
);
1100 printk(KERN_DEBUG
"... APIC LDR: %08x\n", v
);
1101 v
= apic_read(APIC_DFR
);
1102 printk(KERN_DEBUG
"... APIC DFR: %08x\n", v
);
1103 v
= apic_read(APIC_SPIV
);
1104 printk(KERN_DEBUG
"... APIC SPIV: %08x\n", v
);
1106 printk(KERN_DEBUG
"... APIC ISR field:\n");
1107 print_APIC_bitfield(APIC_ISR
);
1108 printk(KERN_DEBUG
"... APIC TMR field:\n");
1109 print_APIC_bitfield(APIC_TMR
);
1110 printk(KERN_DEBUG
"... APIC IRR field:\n");
1111 print_APIC_bitfield(APIC_IRR
);
1113 v
= apic_read(APIC_ESR
);
1114 printk(KERN_DEBUG
"... APIC ESR: %08x\n", v
);
1116 v
= apic_read(APIC_ICR
);
1117 printk(KERN_DEBUG
"... APIC ICR: %08x\n", v
);
1118 v
= apic_read(APIC_ICR2
);
1119 printk(KERN_DEBUG
"... APIC ICR2: %08x\n", v
);
1121 v
= apic_read(APIC_LVTT
);
1122 printk(KERN_DEBUG
"... APIC LVTT: %08x\n", v
);
1124 if (maxlvt
> 3) { /* PC is LVT#4. */
1125 v
= apic_read(APIC_LVTPC
);
1126 printk(KERN_DEBUG
"... APIC LVTPC: %08x\n", v
);
1128 v
= apic_read(APIC_LVT0
);
1129 printk(KERN_DEBUG
"... APIC LVT0: %08x\n", v
);
1130 v
= apic_read(APIC_LVT1
);
1131 printk(KERN_DEBUG
"... APIC LVT1: %08x\n", v
);
1133 if (maxlvt
> 2) { /* ERR is LVT#3. */
1134 v
= apic_read(APIC_LVTERR
);
1135 printk(KERN_DEBUG
"... APIC LVTERR: %08x\n", v
);
1138 v
= apic_read(APIC_TMICT
);
1139 printk(KERN_DEBUG
"... APIC TMICT: %08x\n", v
);
1140 v
= apic_read(APIC_TMCCT
);
1141 printk(KERN_DEBUG
"... APIC TMCCT: %08x\n", v
);
1142 v
= apic_read(APIC_TDCR
);
1143 printk(KERN_DEBUG
"... APIC TDCR: %08x\n", v
);
1147 void print_all_local_APICs (void)
1149 on_each_cpu(print_local_APIC
, NULL
, 1, 1);
1152 void __apicdebuginit
print_PIC(void)
1155 unsigned long flags
;
1157 if (apic_verbosity
== APIC_QUIET
)
1160 printk(KERN_DEBUG
"\nprinting PIC contents\n");
1162 spin_lock_irqsave(&i8259A_lock
, flags
);
1164 v
= inb(0xa1) << 8 | inb(0x21);
1165 printk(KERN_DEBUG
"... PIC IMR: %04x\n", v
);
1167 v
= inb(0xa0) << 8 | inb(0x20);
1168 printk(KERN_DEBUG
"... PIC IRR: %04x\n", v
);
1172 v
= inb(0xa0) << 8 | inb(0x20);
1176 spin_unlock_irqrestore(&i8259A_lock
, flags
);
1178 printk(KERN_DEBUG
"... PIC ISR: %04x\n", v
);
1180 v
= inb(0x4d1) << 8 | inb(0x4d0);
1181 printk(KERN_DEBUG
"... PIC ELCR: %04x\n", v
);
1186 void __init
enable_IO_APIC(void)
1188 union IO_APIC_reg_01 reg_01
;
1189 int i8259_apic
, i8259_pin
;
1191 unsigned long flags
;
1193 for (i
= 0; i
< PIN_MAP_SIZE
; i
++) {
1194 irq_2_pin
[i
].pin
= -1;
1195 irq_2_pin
[i
].next
= 0;
1199 * The number of IO-APIC IRQ registers (== #pins):
1201 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1202 spin_lock_irqsave(&ioapic_lock
, flags
);
1203 reg_01
.raw
= io_apic_read(apic
, 1);
1204 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1205 nr_ioapic_registers
[apic
] = reg_01
.bits
.entries
+1;
1207 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
1209 /* See if any of the pins is in ExtINT mode */
1210 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
1211 struct IO_APIC_route_entry entry
;
1212 entry
= ioapic_read_entry(apic
, pin
);
1214 /* If the interrupt line is enabled and in ExtInt mode
1215 * I have found the pin where the i8259 is connected.
1217 if ((entry
.mask
== 0) && (entry
.delivery_mode
== dest_ExtINT
)) {
1218 ioapic_i8259
.apic
= apic
;
1219 ioapic_i8259
.pin
= pin
;
1225 /* Look to see what if the MP table has reported the ExtINT */
1226 i8259_pin
= find_isa_irq_pin(0, mp_ExtINT
);
1227 i8259_apic
= find_isa_irq_apic(0, mp_ExtINT
);
1228 /* Trust the MP table if nothing is setup in the hardware */
1229 if ((ioapic_i8259
.pin
== -1) && (i8259_pin
>= 0)) {
1230 printk(KERN_WARNING
"ExtINT not setup in hardware but reported by MP table\n");
1231 ioapic_i8259
.pin
= i8259_pin
;
1232 ioapic_i8259
.apic
= i8259_apic
;
1234 /* Complain if the MP table and the hardware disagree */
1235 if (((ioapic_i8259
.apic
!= i8259_apic
) || (ioapic_i8259
.pin
!= i8259_pin
)) &&
1236 (i8259_pin
>= 0) && (ioapic_i8259
.pin
>= 0))
1238 printk(KERN_WARNING
"ExtINT in hardware and MP table differ\n");
1242 * Do not trust the IO-APIC being empty at bootup
1248 * Not an __init, needed by the reboot code
1250 void disable_IO_APIC(void)
1253 * Clear the IO-APIC before rebooting:
1258 * If the i8259 is routed through an IOAPIC
1259 * Put that IOAPIC in virtual wire mode
1260 * so legacy interrupts can be delivered.
1262 if (ioapic_i8259
.pin
!= -1) {
1263 struct IO_APIC_route_entry entry
;
1265 memset(&entry
, 0, sizeof(entry
));
1266 entry
.mask
= 0; /* Enabled */
1267 entry
.trigger
= 0; /* Edge */
1269 entry
.polarity
= 0; /* High */
1270 entry
.delivery_status
= 0;
1271 entry
.dest_mode
= 0; /* Physical */
1272 entry
.delivery_mode
= dest_ExtINT
; /* ExtInt */
1274 entry
.dest
= GET_APIC_ID(read_apic_id());
1277 * Add it to the IO-APIC irq-routing table:
1279 ioapic_write_entry(ioapic_i8259
.apic
, ioapic_i8259
.pin
, entry
);
1282 disconnect_bsp_APIC(ioapic_i8259
.pin
!= -1);
1286 * There is a nasty bug in some older SMP boards, their mptable lies
1287 * about the timer IRQ. We do the following to work around the situation:
1289 * - timer IRQ defaults to IO-APIC IRQ
1290 * - if this function detects that timer IRQs are defunct, then we fall
1291 * back to ISA timer IRQs
1293 static int __init
timer_irq_works(void)
1295 unsigned long t1
= jiffies
;
1296 unsigned long flags
;
1298 local_save_flags(flags
);
1300 /* Let ten ticks pass... */
1301 mdelay((10 * 1000) / HZ
);
1302 local_irq_restore(flags
);
1305 * Expect a few ticks at least, to be sure some possible
1306 * glue logic does not lock up after one or two first
1307 * ticks in a non-ExtINT mode. Also the local APIC
1308 * might have cached one ExtINT interrupt. Finally, at
1309 * least one tick may be lost due to delays.
1313 if (time_after(jiffies
, t1
+ 4))
1319 * In the SMP+IOAPIC case it might happen that there are an unspecified
1320 * number of pending IRQ events unhandled. These cases are very rare,
1321 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1322 * better to do it this way as thus we do not have to be aware of
1323 * 'pending' interrupts in the IRQ path, except at this point.
1326 * Edge triggered needs to resend any interrupt
1327 * that was delayed but this is now handled in the device
1332 * Starting up a edge-triggered IO-APIC interrupt is
1333 * nasty - we need to make sure that we get the edge.
1334 * If it is already asserted for some reason, we need
1335 * return 1 to indicate that is was pending.
1337 * This is not complete - we should be able to fake
1338 * an edge even if it isn't on the 8259A...
1341 static unsigned int startup_ioapic_irq(unsigned int irq
)
1343 int was_pending
= 0;
1344 unsigned long flags
;
1346 spin_lock_irqsave(&ioapic_lock
, flags
);
1348 disable_8259A_irq(irq
);
1349 if (i8259A_irq_pending(irq
))
1352 __unmask_IO_APIC_irq(irq
);
1353 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1358 static int ioapic_retrigger_irq(unsigned int irq
)
1360 struct irq_cfg
*cfg
= &irq_cfg
[irq
];
1362 unsigned long flags
;
1364 spin_lock_irqsave(&vector_lock
, flags
);
1366 cpu_set(first_cpu(cfg
->domain
), mask
);
1368 send_IPI_mask(mask
, cfg
->vector
);
1369 spin_unlock_irqrestore(&vector_lock
, flags
);
1375 * Level and edge triggered IO-APIC interrupts need different handling,
1376 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1377 * handled with the level-triggered descriptor, but that one has slightly
1378 * more overhead. Level-triggered interrupts cannot be handled with the
1379 * edge-triggered handler, without risking IRQ storms and other ugly
1384 asmlinkage
void smp_irq_move_cleanup_interrupt(void)
1386 unsigned vector
, me
;
1391 me
= smp_processor_id();
1392 for (vector
= FIRST_EXTERNAL_VECTOR
; vector
< NR_VECTORS
; vector
++) {
1394 struct irq_desc
*desc
;
1395 struct irq_cfg
*cfg
;
1396 irq
= __get_cpu_var(vector_irq
)[vector
];
1400 desc
= irq_desc
+ irq
;
1401 cfg
= irq_cfg
+ irq
;
1402 spin_lock(&desc
->lock
);
1403 if (!cfg
->move_cleanup_count
)
1406 if ((vector
== cfg
->vector
) && cpu_isset(me
, cfg
->domain
))
1409 __get_cpu_var(vector_irq
)[vector
] = -1;
1410 cfg
->move_cleanup_count
--;
1412 spin_unlock(&desc
->lock
);
1418 static void irq_complete_move(unsigned int irq
)
1420 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
1421 unsigned vector
, me
;
1423 if (likely(!cfg
->move_in_progress
))
1426 vector
= ~get_irq_regs()->orig_ax
;
1427 me
= smp_processor_id();
1428 if ((vector
== cfg
->vector
) && cpu_isset(me
, cfg
->domain
)) {
1429 cpumask_t cleanup_mask
;
1431 cpus_and(cleanup_mask
, cfg
->old_domain
, cpu_online_map
);
1432 cfg
->move_cleanup_count
= cpus_weight(cleanup_mask
);
1433 send_IPI_mask(cleanup_mask
, IRQ_MOVE_CLEANUP_VECTOR
);
1434 cfg
->move_in_progress
= 0;
1438 static inline void irq_complete_move(unsigned int irq
) {}
1441 static void ack_apic_edge(unsigned int irq
)
1443 irq_complete_move(irq
);
1444 move_native_irq(irq
);
1448 static void ack_apic_level(unsigned int irq
)
1450 int do_unmask_irq
= 0;
1452 irq_complete_move(irq
);
1453 #ifdef CONFIG_GENERIC_PENDING_IRQ
1454 /* If we are moving the irq we need to mask it */
1455 if (unlikely(irq_desc
[irq
].status
& IRQ_MOVE_PENDING
)) {
1457 mask_IO_APIC_irq(irq
);
1462 * We must acknowledge the irq before we move it or the acknowledge will
1463 * not propagate properly.
1467 /* Now we can move and renable the irq */
1468 if (unlikely(do_unmask_irq
)) {
1469 /* Only migrate the irq if the ack has been received.
1471 * On rare occasions the broadcast level triggered ack gets
1472 * delayed going to ioapics, and if we reprogram the
1473 * vector while Remote IRR is still set the irq will never
1476 * To prevent this scenario we read the Remote IRR bit
1477 * of the ioapic. This has two effects.
1478 * - On any sane system the read of the ioapic will
1479 * flush writes (and acks) going to the ioapic from
1481 * - We get to see if the ACK has actually been delivered.
1483 * Based on failed experiments of reprogramming the
1484 * ioapic entry from outside of irq context starting
1485 * with masking the ioapic entry and then polling until
1486 * Remote IRR was clear before reprogramming the
1487 * ioapic I don't trust the Remote IRR bit to be
1488 * completey accurate.
1490 * However there appears to be no other way to plug
1491 * this race, so if the Remote IRR bit is not
1492 * accurate and is causing problems then it is a hardware bug
1493 * and you can go talk to the chipset vendor about it.
1495 if (!io_apic_level_ack_pending(irq
))
1496 move_masked_irq(irq
);
1497 unmask_IO_APIC_irq(irq
);
1501 static struct irq_chip ioapic_chip __read_mostly
= {
1503 .startup
= startup_ioapic_irq
,
1504 .mask
= mask_IO_APIC_irq
,
1505 .unmask
= unmask_IO_APIC_irq
,
1506 .ack
= ack_apic_edge
,
1507 .eoi
= ack_apic_level
,
1509 .set_affinity
= set_ioapic_affinity_irq
,
1511 .retrigger
= ioapic_retrigger_irq
,
1514 static inline void init_IO_APIC_traps(void)
1519 * NOTE! The local APIC isn't very good at handling
1520 * multiple interrupts at the same interrupt level.
1521 * As the interrupt level is determined by taking the
1522 * vector number and shifting that right by 4, we
1523 * want to spread these out a bit so that they don't
1524 * all fall in the same interrupt level.
1526 * Also, we've got to be careful not to trash gate
1527 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1529 for (irq
= 0; irq
< NR_IRQS
; irq
++) {
1530 if (IO_APIC_IRQ(irq
) && !irq_cfg
[irq
].vector
) {
1532 * Hmm.. We don't have an entry for this,
1533 * so default to an old-fashioned 8259
1534 * interrupt if we can..
1537 make_8259A_irq(irq
);
1539 /* Strange. Oh, well.. */
1540 irq_desc
[irq
].chip
= &no_irq_chip
;
1545 static void enable_lapic_irq (unsigned int irq
)
1549 v
= apic_read(APIC_LVT0
);
1550 apic_write(APIC_LVT0
, v
& ~APIC_LVT_MASKED
);
1553 static void disable_lapic_irq (unsigned int irq
)
1557 v
= apic_read(APIC_LVT0
);
1558 apic_write(APIC_LVT0
, v
| APIC_LVT_MASKED
);
1561 static void ack_lapic_irq (unsigned int irq
)
1566 static void end_lapic_irq (unsigned int i
) { /* nothing */ }
1568 static struct hw_interrupt_type lapic_irq_type __read_mostly
= {
1569 .name
= "local-APIC",
1570 .typename
= "local-APIC-edge",
1571 .startup
= NULL
, /* startup_irq() not used for IRQ0 */
1572 .shutdown
= NULL
, /* shutdown_irq() not used for IRQ0 */
1573 .enable
= enable_lapic_irq
,
1574 .disable
= disable_lapic_irq
,
1575 .ack
= ack_lapic_irq
,
1576 .end
= end_lapic_irq
,
1579 static void __init
setup_nmi(void)
1582 * Dirty trick to enable the NMI watchdog ...
1583 * We put the 8259A master into AEOI mode and
1584 * unmask on all local APICs LVT0 as NMI.
1586 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1587 * is from Maciej W. Rozycki - so we do not have to EOI from
1588 * the NMI handler or the timer interrupt.
1590 printk(KERN_INFO
"activating NMI Watchdog ...");
1592 enable_NMI_through_LVT0();
1598 * This looks a bit hackish but it's about the only one way of sending
1599 * a few INTA cycles to 8259As and any associated glue logic. ICR does
1600 * not support the ExtINT mode, unfortunately. We need to send these
1601 * cycles as some i82489DX-based boards have glue logic that keeps the
1602 * 8259A interrupt line asserted until INTA. --macro
1604 static inline void unlock_ExtINT_logic(void)
1607 struct IO_APIC_route_entry entry0
, entry1
;
1608 unsigned char save_control
, save_freq_select
;
1610 pin
= find_isa_irq_pin(8, mp_INT
);
1611 apic
= find_isa_irq_apic(8, mp_INT
);
1615 entry0
= ioapic_read_entry(apic
, pin
);
1617 clear_IO_APIC_pin(apic
, pin
);
1619 memset(&entry1
, 0, sizeof(entry1
));
1621 entry1
.dest_mode
= 0; /* physical delivery */
1622 entry1
.mask
= 0; /* unmask IRQ now */
1623 entry1
.dest
= hard_smp_processor_id();
1624 entry1
.delivery_mode
= dest_ExtINT
;
1625 entry1
.polarity
= entry0
.polarity
;
1629 ioapic_write_entry(apic
, pin
, entry1
);
1631 save_control
= CMOS_READ(RTC_CONTROL
);
1632 save_freq_select
= CMOS_READ(RTC_FREQ_SELECT
);
1633 CMOS_WRITE((save_freq_select
& ~RTC_RATE_SELECT
) | 0x6,
1635 CMOS_WRITE(save_control
| RTC_PIE
, RTC_CONTROL
);
1640 if ((CMOS_READ(RTC_INTR_FLAGS
) & RTC_PF
) == RTC_PF
)
1644 CMOS_WRITE(save_control
, RTC_CONTROL
);
1645 CMOS_WRITE(save_freq_select
, RTC_FREQ_SELECT
);
1646 clear_IO_APIC_pin(apic
, pin
);
1648 ioapic_write_entry(apic
, pin
, entry0
);
1652 * This code may look a bit paranoid, but it's supposed to cooperate with
1653 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
1654 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
1655 * fanatically on his truly buggy board.
1657 * FIXME: really need to revamp this for modern platforms only.
1659 static inline void __init
check_timer(void)
1661 struct irq_cfg
*cfg
= irq_cfg
+ 0;
1662 int apic1
, pin1
, apic2
, pin2
;
1663 unsigned long flags
;
1665 local_irq_save(flags
);
1668 * get/set the timer IRQ vector:
1670 disable_8259A_irq(0);
1671 assign_irq_vector(0, TARGET_CPUS
);
1674 * Subtle, code in do_timer_interrupt() expects an AEOI
1675 * mode for the 8259A whenever interrupts are routed
1676 * through I/O APICs. Also IRQ0 has to be enabled in
1677 * the 8259A which implies the virtual wire has to be
1678 * disabled in the local APIC.
1680 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_EXTINT
);
1682 if (timer_over_8254
> 0)
1683 enable_8259A_irq(0);
1685 pin1
= find_isa_irq_pin(0, mp_INT
);
1686 apic1
= find_isa_irq_apic(0, mp_INT
);
1687 pin2
= ioapic_i8259
.pin
;
1688 apic2
= ioapic_i8259
.apic
;
1690 apic_printk(APIC_VERBOSE
,KERN_INFO
"..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
1691 cfg
->vector
, apic1
, pin1
, apic2
, pin2
);
1695 * Ok, does IRQ0 through the IOAPIC work?
1697 unmask_IO_APIC_irq(0);
1698 if (!no_timer_check
&& timer_irq_works()) {
1699 nmi_watchdog_default();
1700 if (nmi_watchdog
== NMI_IO_APIC
) {
1701 disable_8259A_irq(0);
1703 enable_8259A_irq(0);
1705 if (disable_timer_pin_1
> 0)
1706 clear_IO_APIC_pin(0, pin1
);
1709 clear_IO_APIC_pin(apic1
, pin1
);
1710 apic_printk(APIC_QUIET
,KERN_ERR
"..MP-BIOS bug: 8254 timer not "
1711 "connected to IO-APIC\n");
1714 apic_printk(APIC_VERBOSE
,KERN_INFO
"...trying to set up timer (IRQ0) "
1715 "through the 8259A ... ");
1717 apic_printk(APIC_VERBOSE
,"\n..... (found apic %d pin %d) ...",
1720 * legacy devices should be connected to IO APIC #0
1722 setup_ExtINT_IRQ0_pin(apic2
, pin2
, cfg
->vector
);
1723 if (timer_irq_works()) {
1724 apic_printk(APIC_VERBOSE
," works.\n");
1725 nmi_watchdog_default();
1726 if (nmi_watchdog
== NMI_IO_APIC
) {
1732 * Cleanup, just in case ...
1734 clear_IO_APIC_pin(apic2
, pin2
);
1736 apic_printk(APIC_VERBOSE
," failed.\n");
1738 if (nmi_watchdog
== NMI_IO_APIC
) {
1739 printk(KERN_WARNING
"timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
1743 apic_printk(APIC_VERBOSE
, KERN_INFO
"...trying to set up timer as Virtual Wire IRQ...");
1745 disable_8259A_irq(0);
1746 irq_desc
[0].chip
= &lapic_irq_type
;
1747 apic_write(APIC_LVT0
, APIC_DM_FIXED
| cfg
->vector
); /* Fixed mode */
1748 enable_8259A_irq(0);
1750 if (timer_irq_works()) {
1751 apic_printk(APIC_VERBOSE
," works.\n");
1754 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_FIXED
| cfg
->vector
);
1755 apic_printk(APIC_VERBOSE
," failed.\n");
1757 apic_printk(APIC_VERBOSE
, KERN_INFO
"...trying to set up timer as ExtINT IRQ...");
1761 apic_write(APIC_LVT0
, APIC_DM_EXTINT
);
1763 unlock_ExtINT_logic();
1765 if (timer_irq_works()) {
1766 apic_printk(APIC_VERBOSE
," works.\n");
1769 apic_printk(APIC_VERBOSE
," failed :(.\n");
1770 panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
1772 local_irq_restore(flags
);
1775 static int __init
notimercheck(char *s
)
1780 __setup("no_timer_check", notimercheck
);
1784 * IRQs that are handled by the PIC in the MPS IOAPIC case.
1785 * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
1786 * Linux doesn't really care, as it's not actually used
1787 * for any interrupt handling anyway.
1789 #define PIC_IRQS (1<<2)
1791 void __init
setup_IO_APIC(void)
1795 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
1799 io_apic_irqs
= ~0; /* all IRQs go through IOAPIC */
1801 io_apic_irqs
= ~PIC_IRQS
;
1803 apic_printk(APIC_VERBOSE
, "ENABLING IO-APIC IRQs\n");
1806 setup_IO_APIC_irqs();
1807 init_IO_APIC_traps();
1813 struct sysfs_ioapic_data
{
1814 struct sys_device dev
;
1815 struct IO_APIC_route_entry entry
[0];
1817 static struct sysfs_ioapic_data
* mp_ioapic_data
[MAX_IO_APICS
];
1819 static int ioapic_suspend(struct sys_device
*dev
, pm_message_t state
)
1821 struct IO_APIC_route_entry
*entry
;
1822 struct sysfs_ioapic_data
*data
;
1825 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
1826 entry
= data
->entry
;
1827 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++, entry
++ )
1828 *entry
= ioapic_read_entry(dev
->id
, i
);
1833 static int ioapic_resume(struct sys_device
*dev
)
1835 struct IO_APIC_route_entry
*entry
;
1836 struct sysfs_ioapic_data
*data
;
1837 unsigned long flags
;
1838 union IO_APIC_reg_00 reg_00
;
1841 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
1842 entry
= data
->entry
;
1844 spin_lock_irqsave(&ioapic_lock
, flags
);
1845 reg_00
.raw
= io_apic_read(dev
->id
, 0);
1846 if (reg_00
.bits
.ID
!= mp_ioapics
[dev
->id
].mpc_apicid
) {
1847 reg_00
.bits
.ID
= mp_ioapics
[dev
->id
].mpc_apicid
;
1848 io_apic_write(dev
->id
, 0, reg_00
.raw
);
1850 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1851 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++)
1852 ioapic_write_entry(dev
->id
, i
, entry
[i
]);
1857 static struct sysdev_class ioapic_sysdev_class
= {
1859 .suspend
= ioapic_suspend
,
1860 .resume
= ioapic_resume
,
1863 static int __init
ioapic_init_sysfs(void)
1865 struct sys_device
* dev
;
1868 error
= sysdev_class_register(&ioapic_sysdev_class
);
1872 for (i
= 0; i
< nr_ioapics
; i
++ ) {
1873 size
= sizeof(struct sys_device
) + nr_ioapic_registers
[i
]
1874 * sizeof(struct IO_APIC_route_entry
);
1875 mp_ioapic_data
[i
] = kzalloc(size
, GFP_KERNEL
);
1876 if (!mp_ioapic_data
[i
]) {
1877 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
1880 dev
= &mp_ioapic_data
[i
]->dev
;
1882 dev
->cls
= &ioapic_sysdev_class
;
1883 error
= sysdev_register(dev
);
1885 kfree(mp_ioapic_data
[i
]);
1886 mp_ioapic_data
[i
] = NULL
;
1887 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
1895 device_initcall(ioapic_init_sysfs
);
1898 * Dynamic irq allocate and deallocation
1900 int create_irq(void)
1902 /* Allocate an unused irq */
1905 unsigned long flags
;
1908 spin_lock_irqsave(&vector_lock
, flags
);
1909 for (new = (NR_IRQS
- 1); new >= 0; new--) {
1910 if (platform_legacy_irq(new))
1912 if (irq_cfg
[new].vector
!= 0)
1914 if (__assign_irq_vector(new, TARGET_CPUS
) == 0)
1918 spin_unlock_irqrestore(&vector_lock
, flags
);
1921 dynamic_irq_init(irq
);
1926 void destroy_irq(unsigned int irq
)
1928 unsigned long flags
;
1930 dynamic_irq_cleanup(irq
);
1932 spin_lock_irqsave(&vector_lock
, flags
);
1933 __clear_irq_vector(irq
);
1934 spin_unlock_irqrestore(&vector_lock
, flags
);
1938 * MSI message composition
1940 #ifdef CONFIG_PCI_MSI
1941 static int msi_compose_msg(struct pci_dev
*pdev
, unsigned int irq
, struct msi_msg
*msg
)
1943 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
1949 err
= assign_irq_vector(irq
, tmp
);
1951 cpus_and(tmp
, cfg
->domain
, tmp
);
1952 dest
= cpu_mask_to_apicid(tmp
);
1954 msg
->address_hi
= MSI_ADDR_BASE_HI
;
1957 ((INT_DEST_MODE
== 0) ?
1958 MSI_ADDR_DEST_MODE_PHYSICAL
:
1959 MSI_ADDR_DEST_MODE_LOGICAL
) |
1960 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
1961 MSI_ADDR_REDIRECTION_CPU
:
1962 MSI_ADDR_REDIRECTION_LOWPRI
) |
1963 MSI_ADDR_DEST_ID(dest
);
1966 MSI_DATA_TRIGGER_EDGE
|
1967 MSI_DATA_LEVEL_ASSERT
|
1968 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
1969 MSI_DATA_DELIVERY_FIXED
:
1970 MSI_DATA_DELIVERY_LOWPRI
) |
1971 MSI_DATA_VECTOR(cfg
->vector
);
1977 static void set_msi_irq_affinity(unsigned int irq
, cpumask_t mask
)
1979 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
1984 cpus_and(tmp
, mask
, cpu_online_map
);
1985 if (cpus_empty(tmp
))
1988 if (assign_irq_vector(irq
, mask
))
1991 cpus_and(tmp
, cfg
->domain
, mask
);
1992 dest
= cpu_mask_to_apicid(tmp
);
1994 read_msi_msg(irq
, &msg
);
1996 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
1997 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
1998 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
1999 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
2001 write_msi_msg(irq
, &msg
);
2002 irq_desc
[irq
].affinity
= mask
;
2004 #endif /* CONFIG_SMP */
2007 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
2008 * which implement the MSI or MSI-X Capability Structure.
2010 static struct irq_chip msi_chip
= {
2012 .unmask
= unmask_msi_irq
,
2013 .mask
= mask_msi_irq
,
2014 .ack
= ack_apic_edge
,
2016 .set_affinity
= set_msi_irq_affinity
,
2018 .retrigger
= ioapic_retrigger_irq
,
2021 int arch_setup_msi_irq(struct pci_dev
*dev
, struct msi_desc
*desc
)
2029 ret
= msi_compose_msg(dev
, irq
, &msg
);
2035 set_irq_msi(irq
, desc
);
2036 write_msi_msg(irq
, &msg
);
2038 set_irq_chip_and_handler_name(irq
, &msi_chip
, handle_edge_irq
, "edge");
2043 void arch_teardown_msi_irq(unsigned int irq
)
2050 static void dmar_msi_set_affinity(unsigned int irq
, cpumask_t mask
)
2052 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
2057 cpus_and(tmp
, mask
, cpu_online_map
);
2058 if (cpus_empty(tmp
))
2061 if (assign_irq_vector(irq
, mask
))
2064 cpus_and(tmp
, cfg
->domain
, mask
);
2065 dest
= cpu_mask_to_apicid(tmp
);
2067 dmar_msi_read(irq
, &msg
);
2069 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
2070 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
2071 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
2072 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
2074 dmar_msi_write(irq
, &msg
);
2075 irq_desc
[irq
].affinity
= mask
;
2077 #endif /* CONFIG_SMP */
2079 struct irq_chip dmar_msi_type
= {
2081 .unmask
= dmar_msi_unmask
,
2082 .mask
= dmar_msi_mask
,
2083 .ack
= ack_apic_edge
,
2085 .set_affinity
= dmar_msi_set_affinity
,
2087 .retrigger
= ioapic_retrigger_irq
,
2090 int arch_setup_dmar_msi(unsigned int irq
)
2095 ret
= msi_compose_msg(NULL
, irq
, &msg
);
2098 dmar_msi_write(irq
, &msg
);
2099 set_irq_chip_and_handler_name(irq
, &dmar_msi_type
, handle_edge_irq
,
2105 #endif /* CONFIG_PCI_MSI */
2107 * Hypertransport interrupt support
2109 #ifdef CONFIG_HT_IRQ
2113 static void target_ht_irq(unsigned int irq
, unsigned int dest
, u8 vector
)
2115 struct ht_irq_msg msg
;
2116 fetch_ht_irq_msg(irq
, &msg
);
2118 msg
.address_lo
&= ~(HT_IRQ_LOW_VECTOR_MASK
| HT_IRQ_LOW_DEST_ID_MASK
);
2119 msg
.address_hi
&= ~(HT_IRQ_HIGH_DEST_ID_MASK
);
2121 msg
.address_lo
|= HT_IRQ_LOW_VECTOR(vector
) | HT_IRQ_LOW_DEST_ID(dest
);
2122 msg
.address_hi
|= HT_IRQ_HIGH_DEST_ID(dest
);
2124 write_ht_irq_msg(irq
, &msg
);
2127 static void set_ht_irq_affinity(unsigned int irq
, cpumask_t mask
)
2129 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
2133 cpus_and(tmp
, mask
, cpu_online_map
);
2134 if (cpus_empty(tmp
))
2137 if (assign_irq_vector(irq
, mask
))
2140 cpus_and(tmp
, cfg
->domain
, mask
);
2141 dest
= cpu_mask_to_apicid(tmp
);
2143 target_ht_irq(irq
, dest
, cfg
->vector
);
2144 irq_desc
[irq
].affinity
= mask
;
2148 static struct irq_chip ht_irq_chip
= {
2150 .mask
= mask_ht_irq
,
2151 .unmask
= unmask_ht_irq
,
2152 .ack
= ack_apic_edge
,
2154 .set_affinity
= set_ht_irq_affinity
,
2156 .retrigger
= ioapic_retrigger_irq
,
2159 int arch_setup_ht_irq(unsigned int irq
, struct pci_dev
*dev
)
2161 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
2166 err
= assign_irq_vector(irq
, tmp
);
2168 struct ht_irq_msg msg
;
2171 cpus_and(tmp
, cfg
->domain
, tmp
);
2172 dest
= cpu_mask_to_apicid(tmp
);
2174 msg
.address_hi
= HT_IRQ_HIGH_DEST_ID(dest
);
2178 HT_IRQ_LOW_DEST_ID(dest
) |
2179 HT_IRQ_LOW_VECTOR(cfg
->vector
) |
2180 ((INT_DEST_MODE
== 0) ?
2181 HT_IRQ_LOW_DM_PHYSICAL
:
2182 HT_IRQ_LOW_DM_LOGICAL
) |
2183 HT_IRQ_LOW_RQEOI_EDGE
|
2184 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
2185 HT_IRQ_LOW_MT_FIXED
:
2186 HT_IRQ_LOW_MT_ARBITRATED
) |
2187 HT_IRQ_LOW_IRQ_MASKED
;
2189 write_ht_irq_msg(irq
, &msg
);
2191 set_irq_chip_and_handler_name(irq
, &ht_irq_chip
,
2192 handle_edge_irq
, "edge");
2196 #endif /* CONFIG_HT_IRQ */
2198 /* --------------------------------------------------------------------------
2199 ACPI-based IOAPIC Configuration
2200 -------------------------------------------------------------------------- */
2204 #define IO_APIC_MAX_ID 0xFE
2206 int __init
io_apic_get_redir_entries (int ioapic
)
2208 union IO_APIC_reg_01 reg_01
;
2209 unsigned long flags
;
2211 spin_lock_irqsave(&ioapic_lock
, flags
);
2212 reg_01
.raw
= io_apic_read(ioapic
, 1);
2213 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2215 return reg_01
.bits
.entries
;
2219 int io_apic_set_pci_routing (int ioapic
, int pin
, int irq
, int triggering
, int polarity
)
2221 if (!IO_APIC_IRQ(irq
)) {
2222 apic_printk(APIC_QUIET
,KERN_ERR
"IOAPIC[%d]: Invalid reference to IRQ 0\n",
2228 * IRQs < 16 are already in the irq_2_pin[] map
2231 add_pin_to_irq(irq
, ioapic
, pin
);
2233 setup_IO_APIC_irq(ioapic
, pin
, irq
, triggering
, polarity
);
2239 int acpi_get_override_irq(int bus_irq
, int *trigger
, int *polarity
)
2243 if (skip_ioapic_setup
)
2246 for (i
= 0; i
< mp_irq_entries
; i
++)
2247 if (mp_irqs
[i
].mpc_irqtype
== mp_INT
&&
2248 mp_irqs
[i
].mpc_srcbusirq
== bus_irq
)
2250 if (i
>= mp_irq_entries
)
2253 *trigger
= irq_trigger(i
);
2254 *polarity
= irq_polarity(i
);
2258 #endif /* CONFIG_ACPI */
2261 * This function currently is only a helper for the i386 smp boot process where
2262 * we need to reprogram the ioredtbls to cater for the cpus which have come online
2263 * so mask in all cases should simply be TARGET_CPUS
2266 void __init
setup_ioapic_dest(void)
2268 int pin
, ioapic
, irq
, irq_entry
;
2270 if (skip_ioapic_setup
== 1)
2273 for (ioapic
= 0; ioapic
< nr_ioapics
; ioapic
++) {
2274 for (pin
= 0; pin
< nr_ioapic_registers
[ioapic
]; pin
++) {
2275 irq_entry
= find_irq_entry(ioapic
, pin
, mp_INT
);
2276 if (irq_entry
== -1)
2278 irq
= pin_2_irq(irq_entry
, ioapic
, pin
);
2280 /* setup_IO_APIC_irqs could fail to get vector for some device
2281 * when you have too many devices, because at that time only boot
2284 if (!irq_cfg
[irq
].vector
)
2285 setup_IO_APIC_irq(ioapic
, pin
, irq
,
2286 irq_trigger(irq_entry
),
2287 irq_polarity(irq_entry
));
2289 set_ioapic_affinity_irq(irq
, TARGET_CPUS
);
2296 #define IOAPIC_RESOURCE_NAME_SIZE 11
2298 static struct resource
*ioapic_resources
;
2300 static struct resource
* __init
ioapic_setup_resources(void)
2303 struct resource
*res
;
2307 if (nr_ioapics
<= 0)
2310 n
= IOAPIC_RESOURCE_NAME_SIZE
+ sizeof(struct resource
);
2313 mem
= alloc_bootmem(n
);
2317 mem
+= sizeof(struct resource
) * nr_ioapics
;
2319 for (i
= 0; i
< nr_ioapics
; i
++) {
2321 res
[i
].flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
2322 sprintf(mem
, "IOAPIC %u", i
);
2323 mem
+= IOAPIC_RESOURCE_NAME_SIZE
;
2327 ioapic_resources
= res
;
2332 void __init
ioapic_init_mappings(void)
2334 unsigned long ioapic_phys
, idx
= FIX_IO_APIC_BASE_0
;
2335 struct resource
*ioapic_res
;
2338 ioapic_res
= ioapic_setup_resources();
2339 for (i
= 0; i
< nr_ioapics
; i
++) {
2340 if (smp_found_config
) {
2341 ioapic_phys
= mp_ioapics
[i
].mpc_apicaddr
;
2343 ioapic_phys
= (unsigned long)
2344 alloc_bootmem_pages(PAGE_SIZE
);
2345 ioapic_phys
= __pa(ioapic_phys
);
2347 set_fixmap_nocache(idx
, ioapic_phys
);
2348 apic_printk(APIC_VERBOSE
,
2349 "mapped IOAPIC to %016lx (%016lx)\n",
2350 __fix_to_virt(idx
), ioapic_phys
);
2353 if (ioapic_res
!= NULL
) {
2354 ioapic_res
->start
= ioapic_phys
;
2355 ioapic_res
->end
= ioapic_phys
+ (4 * 1024) - 1;
2361 static int __init
ioapic_insert_resources(void)
2364 struct resource
*r
= ioapic_resources
;
2368 "IO APIC resources could be not be allocated.\n");
2372 for (i
= 0; i
< nr_ioapics
; i
++) {
2373 insert_resource(&iomem_resource
, r
);
2380 /* Insert the IO APIC resources after PCI initialization has occured to handle
2381 * IO APICS that are mapped in on a BAR in PCI space. */
2382 late_initcall(ioapic_insert_resources
);