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 static 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_through_8259 __initdata
;
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
);
435 * Find the IRQ entry number of a certain pin.
437 static int find_irq_entry(int apic
, int pin
, int type
)
441 for (i
= 0; i
< mp_irq_entries
; i
++)
442 if (mp_irqs
[i
].mpc_irqtype
== type
&&
443 (mp_irqs
[i
].mpc_dstapic
== mp_ioapics
[apic
].mpc_apicid
||
444 mp_irqs
[i
].mpc_dstapic
== MP_APIC_ALL
) &&
445 mp_irqs
[i
].mpc_dstirq
== pin
)
452 * Find the pin to which IRQ[irq] (ISA) is connected
454 static int __init
find_isa_irq_pin(int irq
, int type
)
458 for (i
= 0; i
< mp_irq_entries
; i
++) {
459 int lbus
= mp_irqs
[i
].mpc_srcbus
;
461 if (test_bit(lbus
, mp_bus_not_pci
) &&
462 (mp_irqs
[i
].mpc_irqtype
== type
) &&
463 (mp_irqs
[i
].mpc_srcbusirq
== irq
))
465 return mp_irqs
[i
].mpc_dstirq
;
470 static int __init
find_isa_irq_apic(int irq
, int type
)
474 for (i
= 0; i
< mp_irq_entries
; i
++) {
475 int lbus
= mp_irqs
[i
].mpc_srcbus
;
477 if (test_bit(lbus
, mp_bus_not_pci
) &&
478 (mp_irqs
[i
].mpc_irqtype
== type
) &&
479 (mp_irqs
[i
].mpc_srcbusirq
== irq
))
482 if (i
< mp_irq_entries
) {
484 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
485 if (mp_ioapics
[apic
].mpc_apicid
== mp_irqs
[i
].mpc_dstapic
)
494 * Find a specific PCI IRQ entry.
495 * Not an __init, possibly needed by modules
497 static int pin_2_irq(int idx
, int apic
, int pin
);
499 int IO_APIC_get_PCI_irq_vector(int bus
, int slot
, int pin
)
501 int apic
, i
, best_guess
= -1;
503 apic_printk(APIC_DEBUG
, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
505 if (mp_bus_id_to_pci_bus
[bus
] == -1) {
506 apic_printk(APIC_VERBOSE
, "PCI BIOS passed nonexistent PCI bus %d!\n", bus
);
509 for (i
= 0; i
< mp_irq_entries
; i
++) {
510 int lbus
= mp_irqs
[i
].mpc_srcbus
;
512 for (apic
= 0; apic
< nr_ioapics
; apic
++)
513 if (mp_ioapics
[apic
].mpc_apicid
== mp_irqs
[i
].mpc_dstapic
||
514 mp_irqs
[i
].mpc_dstapic
== MP_APIC_ALL
)
517 if (!test_bit(lbus
, mp_bus_not_pci
) &&
518 !mp_irqs
[i
].mpc_irqtype
&&
520 (slot
== ((mp_irqs
[i
].mpc_srcbusirq
>> 2) & 0x1f))) {
521 int irq
= pin_2_irq(i
,apic
,mp_irqs
[i
].mpc_dstirq
);
523 if (!(apic
|| IO_APIC_IRQ(irq
)))
526 if (pin
== (mp_irqs
[i
].mpc_srcbusirq
& 3))
529 * Use the first all-but-pin matching entry as a
530 * best-guess fuzzy result for broken mptables.
536 BUG_ON(best_guess
>= NR_IRQS
);
540 /* ISA interrupts are always polarity zero edge triggered,
541 * when listed as conforming in the MP table. */
543 #define default_ISA_trigger(idx) (0)
544 #define default_ISA_polarity(idx) (0)
546 /* PCI interrupts are always polarity one level triggered,
547 * when listed as conforming in the MP table. */
549 #define default_PCI_trigger(idx) (1)
550 #define default_PCI_polarity(idx) (1)
552 static int MPBIOS_polarity(int idx
)
554 int bus
= mp_irqs
[idx
].mpc_srcbus
;
558 * Determine IRQ line polarity (high active or low active):
560 switch (mp_irqs
[idx
].mpc_irqflag
& 3)
562 case 0: /* conforms, ie. bus-type dependent polarity */
563 if (test_bit(bus
, mp_bus_not_pci
))
564 polarity
= default_ISA_polarity(idx
);
566 polarity
= default_PCI_polarity(idx
);
568 case 1: /* high active */
573 case 2: /* reserved */
575 printk(KERN_WARNING
"broken BIOS!!\n");
579 case 3: /* low active */
584 default: /* invalid */
586 printk(KERN_WARNING
"broken BIOS!!\n");
594 static int MPBIOS_trigger(int idx
)
596 int bus
= mp_irqs
[idx
].mpc_srcbus
;
600 * Determine IRQ trigger mode (edge or level sensitive):
602 switch ((mp_irqs
[idx
].mpc_irqflag
>>2) & 3)
604 case 0: /* conforms, ie. bus-type dependent */
605 if (test_bit(bus
, mp_bus_not_pci
))
606 trigger
= default_ISA_trigger(idx
);
608 trigger
= default_PCI_trigger(idx
);
615 case 2: /* reserved */
617 printk(KERN_WARNING
"broken BIOS!!\n");
626 default: /* invalid */
628 printk(KERN_WARNING
"broken BIOS!!\n");
636 static inline int irq_polarity(int idx
)
638 return MPBIOS_polarity(idx
);
641 static inline int irq_trigger(int idx
)
643 return MPBIOS_trigger(idx
);
646 static int pin_2_irq(int idx
, int apic
, int pin
)
649 int bus
= mp_irqs
[idx
].mpc_srcbus
;
652 * Debugging check, we are in big trouble if this message pops up!
654 if (mp_irqs
[idx
].mpc_dstirq
!= pin
)
655 printk(KERN_ERR
"broken BIOS or MPTABLE parser, ayiee!!\n");
657 if (test_bit(bus
, mp_bus_not_pci
)) {
658 irq
= mp_irqs
[idx
].mpc_srcbusirq
;
661 * PCI IRQs are mapped in order
665 irq
+= nr_ioapic_registers
[i
++];
668 BUG_ON(irq
>= NR_IRQS
);
672 static int __assign_irq_vector(int irq
, cpumask_t mask
)
675 * NOTE! The local APIC isn't very good at handling
676 * multiple interrupts at the same interrupt level.
677 * As the interrupt level is determined by taking the
678 * vector number and shifting that right by 4, we
679 * want to spread these out a bit so that they don't
680 * all fall in the same interrupt level.
682 * Also, we've got to be careful not to trash gate
683 * 0x80, because int 0x80 is hm, kind of importantish. ;)
685 static int current_vector
= FIRST_DEVICE_VECTOR
, current_offset
= 0;
686 unsigned int old_vector
;
690 BUG_ON((unsigned)irq
>= NR_IRQS
);
693 /* Only try and allocate irqs on cpus that are present */
694 cpus_and(mask
, mask
, cpu_online_map
);
696 if ((cfg
->move_in_progress
) || cfg
->move_cleanup_count
)
699 old_vector
= cfg
->vector
;
702 cpus_and(tmp
, cfg
->domain
, mask
);
703 if (!cpus_empty(tmp
))
707 for_each_cpu_mask(cpu
, mask
) {
708 cpumask_t domain
, new_mask
;
712 domain
= vector_allocation_domain(cpu
);
713 cpus_and(new_mask
, domain
, cpu_online_map
);
715 vector
= current_vector
;
716 offset
= current_offset
;
719 if (vector
>= FIRST_SYSTEM_VECTOR
) {
720 /* If we run out of vectors on large boxen, must share them. */
721 offset
= (offset
+ 1) % 8;
722 vector
= FIRST_DEVICE_VECTOR
+ offset
;
724 if (unlikely(current_vector
== vector
))
726 if (vector
== IA32_SYSCALL_VECTOR
)
728 for_each_cpu_mask(new_cpu
, new_mask
)
729 if (per_cpu(vector_irq
, new_cpu
)[vector
] != -1)
732 current_vector
= vector
;
733 current_offset
= offset
;
735 cfg
->move_in_progress
= 1;
736 cfg
->old_domain
= cfg
->domain
;
738 for_each_cpu_mask(new_cpu
, new_mask
)
739 per_cpu(vector_irq
, new_cpu
)[vector
] = irq
;
740 cfg
->vector
= vector
;
741 cfg
->domain
= domain
;
747 static int assign_irq_vector(int irq
, cpumask_t mask
)
752 spin_lock_irqsave(&vector_lock
, flags
);
753 err
= __assign_irq_vector(irq
, mask
);
754 spin_unlock_irqrestore(&vector_lock
, flags
);
758 static void __clear_irq_vector(int irq
)
764 BUG_ON((unsigned)irq
>= NR_IRQS
);
766 BUG_ON(!cfg
->vector
);
768 vector
= cfg
->vector
;
769 cpus_and(mask
, cfg
->domain
, cpu_online_map
);
770 for_each_cpu_mask(cpu
, mask
)
771 per_cpu(vector_irq
, cpu
)[vector
] = -1;
774 cpus_clear(cfg
->domain
);
777 void __setup_vector_irq(int cpu
)
779 /* Initialize vector_irq on a new cpu */
780 /* This function must be called with vector_lock held */
783 /* Mark the inuse vectors */
784 for (irq
= 0; irq
< NR_IRQS
; ++irq
) {
785 if (!cpu_isset(cpu
, irq_cfg
[irq
].domain
))
787 vector
= irq_cfg
[irq
].vector
;
788 per_cpu(vector_irq
, cpu
)[vector
] = irq
;
790 /* Mark the free vectors */
791 for (vector
= 0; vector
< NR_VECTORS
; ++vector
) {
792 irq
= per_cpu(vector_irq
, cpu
)[vector
];
795 if (!cpu_isset(cpu
, irq_cfg
[irq
].domain
))
796 per_cpu(vector_irq
, cpu
)[vector
] = -1;
801 static struct irq_chip ioapic_chip
;
803 static void ioapic_register_intr(int irq
, unsigned long trigger
)
806 irq_desc
[irq
].status
|= IRQ_LEVEL
;
807 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
808 handle_fasteoi_irq
, "fasteoi");
810 irq_desc
[irq
].status
&= ~IRQ_LEVEL
;
811 set_irq_chip_and_handler_name(irq
, &ioapic_chip
,
812 handle_edge_irq
, "edge");
816 static void setup_IO_APIC_irq(int apic
, int pin
, unsigned int irq
,
817 int trigger
, int polarity
)
819 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
820 struct IO_APIC_route_entry entry
;
823 if (!IO_APIC_IRQ(irq
))
827 if (assign_irq_vector(irq
, mask
))
830 cpus_and(mask
, cfg
->domain
, mask
);
832 apic_printk(APIC_VERBOSE
,KERN_DEBUG
833 "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
834 "IRQ %d Mode:%i Active:%i)\n",
835 apic
, mp_ioapics
[apic
].mpc_apicid
, pin
, cfg
->vector
,
836 irq
, trigger
, polarity
);
839 * add it to the IO-APIC irq-routing table:
841 memset(&entry
,0,sizeof(entry
));
843 entry
.delivery_mode
= INT_DELIVERY_MODE
;
844 entry
.dest_mode
= INT_DEST_MODE
;
845 entry
.dest
= cpu_mask_to_apicid(mask
);
846 entry
.mask
= 0; /* enable IRQ */
847 entry
.trigger
= trigger
;
848 entry
.polarity
= polarity
;
849 entry
.vector
= cfg
->vector
;
851 /* Mask level triggered irqs.
852 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
857 ioapic_register_intr(irq
, trigger
);
859 disable_8259A_irq(irq
);
861 ioapic_write_entry(apic
, pin
, entry
);
864 static void __init
setup_IO_APIC_irqs(void)
866 int apic
, pin
, idx
, irq
, first_notcon
= 1;
868 apic_printk(APIC_VERBOSE
, KERN_DEBUG
"init IO_APIC IRQs\n");
870 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
871 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
873 idx
= find_irq_entry(apic
,pin
,mp_INT
);
876 apic_printk(APIC_VERBOSE
, KERN_DEBUG
" IO-APIC (apicid-pin) %d-%d", mp_ioapics
[apic
].mpc_apicid
, pin
);
879 apic_printk(APIC_VERBOSE
, ", %d-%d", mp_ioapics
[apic
].mpc_apicid
, pin
);
883 apic_printk(APIC_VERBOSE
, " not connected.\n");
887 irq
= pin_2_irq(idx
, apic
, pin
);
888 add_pin_to_irq(irq
, apic
, pin
);
890 setup_IO_APIC_irq(apic
, pin
, irq
,
891 irq_trigger(idx
), irq_polarity(idx
));
896 apic_printk(APIC_VERBOSE
, " not connected.\n");
900 * Set up the timer pin, possibly with the 8259A-master behind.
902 static void __init
setup_timer_IRQ0_pin(unsigned int apic
, unsigned int pin
,
905 struct IO_APIC_route_entry entry
;
907 memset(&entry
, 0, sizeof(entry
));
910 * We use logical delivery to get the timer IRQ
913 entry
.dest_mode
= INT_DEST_MODE
;
914 entry
.mask
= 1; /* mask IRQ now */
915 entry
.dest
= cpu_mask_to_apicid(TARGET_CPUS
);
916 entry
.delivery_mode
= INT_DELIVERY_MODE
;
919 entry
.vector
= vector
;
922 * The timer IRQ doesn't have to know that behind the
923 * scene we may have a 8259A-master in AEOI mode ...
925 set_irq_chip_and_handler_name(0, &ioapic_chip
, handle_edge_irq
, "edge");
928 * Add it to the IO-APIC irq-routing table:
930 ioapic_write_entry(apic
, pin
, entry
);
933 void __apicdebuginit
print_IO_APIC(void)
936 union IO_APIC_reg_00 reg_00
;
937 union IO_APIC_reg_01 reg_01
;
938 union IO_APIC_reg_02 reg_02
;
941 if (apic_verbosity
== APIC_QUIET
)
944 printk(KERN_DEBUG
"number of MP IRQ sources: %d.\n", mp_irq_entries
);
945 for (i
= 0; i
< nr_ioapics
; i
++)
946 printk(KERN_DEBUG
"number of IO-APIC #%d registers: %d.\n",
947 mp_ioapics
[i
].mpc_apicid
, nr_ioapic_registers
[i
]);
950 * We are a bit conservative about what we expect. We have to
951 * know about every hardware change ASAP.
953 printk(KERN_INFO
"testing the IO APIC.......................\n");
955 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
957 spin_lock_irqsave(&ioapic_lock
, flags
);
958 reg_00
.raw
= io_apic_read(apic
, 0);
959 reg_01
.raw
= io_apic_read(apic
, 1);
960 if (reg_01
.bits
.version
>= 0x10)
961 reg_02
.raw
= io_apic_read(apic
, 2);
962 spin_unlock_irqrestore(&ioapic_lock
, flags
);
965 printk(KERN_DEBUG
"IO APIC #%d......\n", mp_ioapics
[apic
].mpc_apicid
);
966 printk(KERN_DEBUG
".... register #00: %08X\n", reg_00
.raw
);
967 printk(KERN_DEBUG
"....... : physical APIC id: %02X\n", reg_00
.bits
.ID
);
969 printk(KERN_DEBUG
".... register #01: %08X\n", *(int *)®_01
);
970 printk(KERN_DEBUG
"....... : max redirection entries: %04X\n", reg_01
.bits
.entries
);
972 printk(KERN_DEBUG
"....... : PRQ implemented: %X\n", reg_01
.bits
.PRQ
);
973 printk(KERN_DEBUG
"....... : IO APIC version: %04X\n", reg_01
.bits
.version
);
975 if (reg_01
.bits
.version
>= 0x10) {
976 printk(KERN_DEBUG
".... register #02: %08X\n", reg_02
.raw
);
977 printk(KERN_DEBUG
"....... : arbitration: %02X\n", reg_02
.bits
.arbitration
);
980 printk(KERN_DEBUG
".... IRQ redirection table:\n");
982 printk(KERN_DEBUG
" NR Dst Mask Trig IRR Pol"
983 " Stat Dmod Deli Vect: \n");
985 for (i
= 0; i
<= reg_01
.bits
.entries
; i
++) {
986 struct IO_APIC_route_entry entry
;
988 entry
= ioapic_read_entry(apic
, i
);
990 printk(KERN_DEBUG
" %02x %03X ",
995 printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
1000 entry
.delivery_status
,
1002 entry
.delivery_mode
,
1007 printk(KERN_DEBUG
"IRQ to pin mappings:\n");
1008 for (i
= 0; i
< NR_IRQS
; i
++) {
1009 struct irq_pin_list
*entry
= irq_2_pin
+ i
;
1012 printk(KERN_DEBUG
"IRQ%d ", i
);
1014 printk("-> %d:%d", entry
->apic
, entry
->pin
);
1017 entry
= irq_2_pin
+ entry
->next
;
1022 printk(KERN_INFO
".................................... done.\n");
1029 static __apicdebuginit
void print_APIC_bitfield (int base
)
1034 if (apic_verbosity
== APIC_QUIET
)
1037 printk(KERN_DEBUG
"0123456789abcdef0123456789abcdef\n" KERN_DEBUG
);
1038 for (i
= 0; i
< 8; i
++) {
1039 v
= apic_read(base
+ i
*0x10);
1040 for (j
= 0; j
< 32; j
++) {
1050 void __apicdebuginit
print_local_APIC(void * dummy
)
1052 unsigned int v
, ver
, maxlvt
;
1054 if (apic_verbosity
== APIC_QUIET
)
1057 printk("\n" KERN_DEBUG
"printing local APIC contents on CPU#%d/%d:\n",
1058 smp_processor_id(), hard_smp_processor_id());
1059 printk(KERN_INFO
"... APIC ID: %08x (%01x)\n", v
, GET_APIC_ID(read_apic_id()));
1060 v
= apic_read(APIC_LVR
);
1061 printk(KERN_INFO
"... APIC VERSION: %08x\n", v
);
1062 ver
= GET_APIC_VERSION(v
);
1063 maxlvt
= lapic_get_maxlvt();
1065 v
= apic_read(APIC_TASKPRI
);
1066 printk(KERN_DEBUG
"... APIC TASKPRI: %08x (%02x)\n", v
, v
& APIC_TPRI_MASK
);
1068 v
= apic_read(APIC_ARBPRI
);
1069 printk(KERN_DEBUG
"... APIC ARBPRI: %08x (%02x)\n", v
,
1070 v
& APIC_ARBPRI_MASK
);
1071 v
= apic_read(APIC_PROCPRI
);
1072 printk(KERN_DEBUG
"... APIC PROCPRI: %08x\n", v
);
1074 v
= apic_read(APIC_EOI
);
1075 printk(KERN_DEBUG
"... APIC EOI: %08x\n", v
);
1076 v
= apic_read(APIC_RRR
);
1077 printk(KERN_DEBUG
"... APIC RRR: %08x\n", v
);
1078 v
= apic_read(APIC_LDR
);
1079 printk(KERN_DEBUG
"... APIC LDR: %08x\n", v
);
1080 v
= apic_read(APIC_DFR
);
1081 printk(KERN_DEBUG
"... APIC DFR: %08x\n", v
);
1082 v
= apic_read(APIC_SPIV
);
1083 printk(KERN_DEBUG
"... APIC SPIV: %08x\n", v
);
1085 printk(KERN_DEBUG
"... APIC ISR field:\n");
1086 print_APIC_bitfield(APIC_ISR
);
1087 printk(KERN_DEBUG
"... APIC TMR field:\n");
1088 print_APIC_bitfield(APIC_TMR
);
1089 printk(KERN_DEBUG
"... APIC IRR field:\n");
1090 print_APIC_bitfield(APIC_IRR
);
1092 v
= apic_read(APIC_ESR
);
1093 printk(KERN_DEBUG
"... APIC ESR: %08x\n", v
);
1095 v
= apic_read(APIC_ICR
);
1096 printk(KERN_DEBUG
"... APIC ICR: %08x\n", v
);
1097 v
= apic_read(APIC_ICR2
);
1098 printk(KERN_DEBUG
"... APIC ICR2: %08x\n", v
);
1100 v
= apic_read(APIC_LVTT
);
1101 printk(KERN_DEBUG
"... APIC LVTT: %08x\n", v
);
1103 if (maxlvt
> 3) { /* PC is LVT#4. */
1104 v
= apic_read(APIC_LVTPC
);
1105 printk(KERN_DEBUG
"... APIC LVTPC: %08x\n", v
);
1107 v
= apic_read(APIC_LVT0
);
1108 printk(KERN_DEBUG
"... APIC LVT0: %08x\n", v
);
1109 v
= apic_read(APIC_LVT1
);
1110 printk(KERN_DEBUG
"... APIC LVT1: %08x\n", v
);
1112 if (maxlvt
> 2) { /* ERR is LVT#3. */
1113 v
= apic_read(APIC_LVTERR
);
1114 printk(KERN_DEBUG
"... APIC LVTERR: %08x\n", v
);
1117 v
= apic_read(APIC_TMICT
);
1118 printk(KERN_DEBUG
"... APIC TMICT: %08x\n", v
);
1119 v
= apic_read(APIC_TMCCT
);
1120 printk(KERN_DEBUG
"... APIC TMCCT: %08x\n", v
);
1121 v
= apic_read(APIC_TDCR
);
1122 printk(KERN_DEBUG
"... APIC TDCR: %08x\n", v
);
1126 void print_all_local_APICs (void)
1128 on_each_cpu(print_local_APIC
, NULL
, 1, 1);
1131 void __apicdebuginit
print_PIC(void)
1134 unsigned long flags
;
1136 if (apic_verbosity
== APIC_QUIET
)
1139 printk(KERN_DEBUG
"\nprinting PIC contents\n");
1141 spin_lock_irqsave(&i8259A_lock
, flags
);
1143 v
= inb(0xa1) << 8 | inb(0x21);
1144 printk(KERN_DEBUG
"... PIC IMR: %04x\n", v
);
1146 v
= inb(0xa0) << 8 | inb(0x20);
1147 printk(KERN_DEBUG
"... PIC IRR: %04x\n", v
);
1151 v
= inb(0xa0) << 8 | inb(0x20);
1155 spin_unlock_irqrestore(&i8259A_lock
, flags
);
1157 printk(KERN_DEBUG
"... PIC ISR: %04x\n", v
);
1159 v
= inb(0x4d1) << 8 | inb(0x4d0);
1160 printk(KERN_DEBUG
"... PIC ELCR: %04x\n", v
);
1165 void __init
enable_IO_APIC(void)
1167 union IO_APIC_reg_01 reg_01
;
1168 int i8259_apic
, i8259_pin
;
1170 unsigned long flags
;
1172 for (i
= 0; i
< PIN_MAP_SIZE
; i
++) {
1173 irq_2_pin
[i
].pin
= -1;
1174 irq_2_pin
[i
].next
= 0;
1178 * The number of IO-APIC IRQ registers (== #pins):
1180 for (apic
= 0; apic
< nr_ioapics
; apic
++) {
1181 spin_lock_irqsave(&ioapic_lock
, flags
);
1182 reg_01
.raw
= io_apic_read(apic
, 1);
1183 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1184 nr_ioapic_registers
[apic
] = reg_01
.bits
.entries
+1;
1186 for(apic
= 0; apic
< nr_ioapics
; apic
++) {
1188 /* See if any of the pins is in ExtINT mode */
1189 for (pin
= 0; pin
< nr_ioapic_registers
[apic
]; pin
++) {
1190 struct IO_APIC_route_entry entry
;
1191 entry
= ioapic_read_entry(apic
, pin
);
1193 /* If the interrupt line is enabled and in ExtInt mode
1194 * I have found the pin where the i8259 is connected.
1196 if ((entry
.mask
== 0) && (entry
.delivery_mode
== dest_ExtINT
)) {
1197 ioapic_i8259
.apic
= apic
;
1198 ioapic_i8259
.pin
= pin
;
1204 /* Look to see what if the MP table has reported the ExtINT */
1205 i8259_pin
= find_isa_irq_pin(0, mp_ExtINT
);
1206 i8259_apic
= find_isa_irq_apic(0, mp_ExtINT
);
1207 /* Trust the MP table if nothing is setup in the hardware */
1208 if ((ioapic_i8259
.pin
== -1) && (i8259_pin
>= 0)) {
1209 printk(KERN_WARNING
"ExtINT not setup in hardware but reported by MP table\n");
1210 ioapic_i8259
.pin
= i8259_pin
;
1211 ioapic_i8259
.apic
= i8259_apic
;
1213 /* Complain if the MP table and the hardware disagree */
1214 if (((ioapic_i8259
.apic
!= i8259_apic
) || (ioapic_i8259
.pin
!= i8259_pin
)) &&
1215 (i8259_pin
>= 0) && (ioapic_i8259
.pin
>= 0))
1217 printk(KERN_WARNING
"ExtINT in hardware and MP table differ\n");
1221 * Do not trust the IO-APIC being empty at bootup
1227 * Not an __init, needed by the reboot code
1229 void disable_IO_APIC(void)
1232 * Clear the IO-APIC before rebooting:
1237 * If the i8259 is routed through an IOAPIC
1238 * Put that IOAPIC in virtual wire mode
1239 * so legacy interrupts can be delivered.
1241 if (ioapic_i8259
.pin
!= -1) {
1242 struct IO_APIC_route_entry entry
;
1244 memset(&entry
, 0, sizeof(entry
));
1245 entry
.mask
= 0; /* Enabled */
1246 entry
.trigger
= 0; /* Edge */
1248 entry
.polarity
= 0; /* High */
1249 entry
.delivery_status
= 0;
1250 entry
.dest_mode
= 0; /* Physical */
1251 entry
.delivery_mode
= dest_ExtINT
; /* ExtInt */
1253 entry
.dest
= GET_APIC_ID(read_apic_id());
1256 * Add it to the IO-APIC irq-routing table:
1258 ioapic_write_entry(ioapic_i8259
.apic
, ioapic_i8259
.pin
, entry
);
1261 disconnect_bsp_APIC(ioapic_i8259
.pin
!= -1);
1265 * There is a nasty bug in some older SMP boards, their mptable lies
1266 * about the timer IRQ. We do the following to work around the situation:
1268 * - timer IRQ defaults to IO-APIC IRQ
1269 * - if this function detects that timer IRQs are defunct, then we fall
1270 * back to ISA timer IRQs
1272 static int __init
timer_irq_works(void)
1274 unsigned long t1
= jiffies
;
1275 unsigned long flags
;
1277 local_save_flags(flags
);
1279 /* Let ten ticks pass... */
1280 mdelay((10 * 1000) / HZ
);
1281 local_irq_restore(flags
);
1284 * Expect a few ticks at least, to be sure some possible
1285 * glue logic does not lock up after one or two first
1286 * ticks in a non-ExtINT mode. Also the local APIC
1287 * might have cached one ExtINT interrupt. Finally, at
1288 * least one tick may be lost due to delays.
1292 if (time_after(jiffies
, t1
+ 4))
1298 * In the SMP+IOAPIC case it might happen that there are an unspecified
1299 * number of pending IRQ events unhandled. These cases are very rare,
1300 * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1301 * better to do it this way as thus we do not have to be aware of
1302 * 'pending' interrupts in the IRQ path, except at this point.
1305 * Edge triggered needs to resend any interrupt
1306 * that was delayed but this is now handled in the device
1311 * Starting up a edge-triggered IO-APIC interrupt is
1312 * nasty - we need to make sure that we get the edge.
1313 * If it is already asserted for some reason, we need
1314 * return 1 to indicate that is was pending.
1316 * This is not complete - we should be able to fake
1317 * an edge even if it isn't on the 8259A...
1320 static unsigned int startup_ioapic_irq(unsigned int irq
)
1322 int was_pending
= 0;
1323 unsigned long flags
;
1325 spin_lock_irqsave(&ioapic_lock
, flags
);
1327 disable_8259A_irq(irq
);
1328 if (i8259A_irq_pending(irq
))
1331 __unmask_IO_APIC_irq(irq
);
1332 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1337 static int ioapic_retrigger_irq(unsigned int irq
)
1339 struct irq_cfg
*cfg
= &irq_cfg
[irq
];
1341 unsigned long flags
;
1343 spin_lock_irqsave(&vector_lock
, flags
);
1344 mask
= cpumask_of_cpu(first_cpu(cfg
->domain
));
1345 send_IPI_mask(mask
, cfg
->vector
);
1346 spin_unlock_irqrestore(&vector_lock
, flags
);
1352 * Level and edge triggered IO-APIC interrupts need different handling,
1353 * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1354 * handled with the level-triggered descriptor, but that one has slightly
1355 * more overhead. Level-triggered interrupts cannot be handled with the
1356 * edge-triggered handler, without risking IRQ storms and other ugly
1361 asmlinkage
void smp_irq_move_cleanup_interrupt(void)
1363 unsigned vector
, me
;
1368 me
= smp_processor_id();
1369 for (vector
= FIRST_EXTERNAL_VECTOR
; vector
< NR_VECTORS
; vector
++) {
1371 struct irq_desc
*desc
;
1372 struct irq_cfg
*cfg
;
1373 irq
= __get_cpu_var(vector_irq
)[vector
];
1377 desc
= irq_desc
+ irq
;
1378 cfg
= irq_cfg
+ irq
;
1379 spin_lock(&desc
->lock
);
1380 if (!cfg
->move_cleanup_count
)
1383 if ((vector
== cfg
->vector
) && cpu_isset(me
, cfg
->domain
))
1386 __get_cpu_var(vector_irq
)[vector
] = -1;
1387 cfg
->move_cleanup_count
--;
1389 spin_unlock(&desc
->lock
);
1395 static void irq_complete_move(unsigned int irq
)
1397 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
1398 unsigned vector
, me
;
1400 if (likely(!cfg
->move_in_progress
))
1403 vector
= ~get_irq_regs()->orig_ax
;
1404 me
= smp_processor_id();
1405 if ((vector
== cfg
->vector
) && cpu_isset(me
, cfg
->domain
)) {
1406 cpumask_t cleanup_mask
;
1408 cpus_and(cleanup_mask
, cfg
->old_domain
, cpu_online_map
);
1409 cfg
->move_cleanup_count
= cpus_weight(cleanup_mask
);
1410 send_IPI_mask(cleanup_mask
, IRQ_MOVE_CLEANUP_VECTOR
);
1411 cfg
->move_in_progress
= 0;
1415 static inline void irq_complete_move(unsigned int irq
) {}
1418 static void ack_apic_edge(unsigned int irq
)
1420 irq_complete_move(irq
);
1421 move_native_irq(irq
);
1425 static void ack_apic_level(unsigned int irq
)
1427 int do_unmask_irq
= 0;
1429 irq_complete_move(irq
);
1430 #ifdef CONFIG_GENERIC_PENDING_IRQ
1431 /* If we are moving the irq we need to mask it */
1432 if (unlikely(irq_desc
[irq
].status
& IRQ_MOVE_PENDING
)) {
1434 mask_IO_APIC_irq(irq
);
1439 * We must acknowledge the irq before we move it or the acknowledge will
1440 * not propagate properly.
1444 /* Now we can move and renable the irq */
1445 if (unlikely(do_unmask_irq
)) {
1446 /* Only migrate the irq if the ack has been received.
1448 * On rare occasions the broadcast level triggered ack gets
1449 * delayed going to ioapics, and if we reprogram the
1450 * vector while Remote IRR is still set the irq will never
1453 * To prevent this scenario we read the Remote IRR bit
1454 * of the ioapic. This has two effects.
1455 * - On any sane system the read of the ioapic will
1456 * flush writes (and acks) going to the ioapic from
1458 * - We get to see if the ACK has actually been delivered.
1460 * Based on failed experiments of reprogramming the
1461 * ioapic entry from outside of irq context starting
1462 * with masking the ioapic entry and then polling until
1463 * Remote IRR was clear before reprogramming the
1464 * ioapic I don't trust the Remote IRR bit to be
1465 * completey accurate.
1467 * However there appears to be no other way to plug
1468 * this race, so if the Remote IRR bit is not
1469 * accurate and is causing problems then it is a hardware bug
1470 * and you can go talk to the chipset vendor about it.
1472 if (!io_apic_level_ack_pending(irq
))
1473 move_masked_irq(irq
);
1474 unmask_IO_APIC_irq(irq
);
1478 static struct irq_chip ioapic_chip __read_mostly
= {
1480 .startup
= startup_ioapic_irq
,
1481 .mask
= mask_IO_APIC_irq
,
1482 .unmask
= unmask_IO_APIC_irq
,
1483 .ack
= ack_apic_edge
,
1484 .eoi
= ack_apic_level
,
1486 .set_affinity
= set_ioapic_affinity_irq
,
1488 .retrigger
= ioapic_retrigger_irq
,
1491 static inline void init_IO_APIC_traps(void)
1496 * NOTE! The local APIC isn't very good at handling
1497 * multiple interrupts at the same interrupt level.
1498 * As the interrupt level is determined by taking the
1499 * vector number and shifting that right by 4, we
1500 * want to spread these out a bit so that they don't
1501 * all fall in the same interrupt level.
1503 * Also, we've got to be careful not to trash gate
1504 * 0x80, because int 0x80 is hm, kind of importantish. ;)
1506 for (irq
= 0; irq
< NR_IRQS
; irq
++) {
1507 if (IO_APIC_IRQ(irq
) && !irq_cfg
[irq
].vector
) {
1509 * Hmm.. We don't have an entry for this,
1510 * so default to an old-fashioned 8259
1511 * interrupt if we can..
1514 make_8259A_irq(irq
);
1516 /* Strange. Oh, well.. */
1517 irq_desc
[irq
].chip
= &no_irq_chip
;
1522 static void enable_lapic_irq (unsigned int irq
)
1526 v
= apic_read(APIC_LVT0
);
1527 apic_write(APIC_LVT0
, v
& ~APIC_LVT_MASKED
);
1530 static void disable_lapic_irq (unsigned int irq
)
1534 v
= apic_read(APIC_LVT0
);
1535 apic_write(APIC_LVT0
, v
| APIC_LVT_MASKED
);
1538 static void ack_lapic_irq (unsigned int irq
)
1543 static void end_lapic_irq (unsigned int i
) { /* nothing */ }
1545 static struct hw_interrupt_type lapic_irq_type __read_mostly
= {
1546 .name
= "local-APIC",
1547 .typename
= "local-APIC-edge",
1548 .startup
= NULL
, /* startup_irq() not used for IRQ0 */
1549 .shutdown
= NULL
, /* shutdown_irq() not used for IRQ0 */
1550 .enable
= enable_lapic_irq
,
1551 .disable
= disable_lapic_irq
,
1552 .ack
= ack_lapic_irq
,
1553 .end
= end_lapic_irq
,
1556 static void __init
setup_nmi(void)
1559 * Dirty trick to enable the NMI watchdog ...
1560 * We put the 8259A master into AEOI mode and
1561 * unmask on all local APICs LVT0 as NMI.
1563 * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1564 * is from Maciej W. Rozycki - so we do not have to EOI from
1565 * the NMI handler or the timer interrupt.
1567 printk(KERN_INFO
"activating NMI Watchdog ...");
1569 enable_NMI_through_LVT0();
1575 * This looks a bit hackish but it's about the only one way of sending
1576 * a few INTA cycles to 8259As and any associated glue logic. ICR does
1577 * not support the ExtINT mode, unfortunately. We need to send these
1578 * cycles as some i82489DX-based boards have glue logic that keeps the
1579 * 8259A interrupt line asserted until INTA. --macro
1581 static inline void __init
unlock_ExtINT_logic(void)
1584 struct IO_APIC_route_entry entry0
, entry1
;
1585 unsigned char save_control
, save_freq_select
;
1587 pin
= find_isa_irq_pin(8, mp_INT
);
1588 apic
= find_isa_irq_apic(8, mp_INT
);
1592 entry0
= ioapic_read_entry(apic
, pin
);
1594 clear_IO_APIC_pin(apic
, pin
);
1596 memset(&entry1
, 0, sizeof(entry1
));
1598 entry1
.dest_mode
= 0; /* physical delivery */
1599 entry1
.mask
= 0; /* unmask IRQ now */
1600 entry1
.dest
= hard_smp_processor_id();
1601 entry1
.delivery_mode
= dest_ExtINT
;
1602 entry1
.polarity
= entry0
.polarity
;
1606 ioapic_write_entry(apic
, pin
, entry1
);
1608 save_control
= CMOS_READ(RTC_CONTROL
);
1609 save_freq_select
= CMOS_READ(RTC_FREQ_SELECT
);
1610 CMOS_WRITE((save_freq_select
& ~RTC_RATE_SELECT
) | 0x6,
1612 CMOS_WRITE(save_control
| RTC_PIE
, RTC_CONTROL
);
1617 if ((CMOS_READ(RTC_INTR_FLAGS
) & RTC_PF
) == RTC_PF
)
1621 CMOS_WRITE(save_control
, RTC_CONTROL
);
1622 CMOS_WRITE(save_freq_select
, RTC_FREQ_SELECT
);
1623 clear_IO_APIC_pin(apic
, pin
);
1625 ioapic_write_entry(apic
, pin
, entry0
);
1629 * This code may look a bit paranoid, but it's supposed to cooperate with
1630 * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
1631 * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
1632 * fanatically on his truly buggy board.
1634 * FIXME: really need to revamp this for modern platforms only.
1636 static inline void __init
check_timer(void)
1638 struct irq_cfg
*cfg
= irq_cfg
+ 0;
1639 int apic1
, pin1
, apic2
, pin2
;
1640 unsigned long flags
;
1643 local_irq_save(flags
);
1646 * get/set the timer IRQ vector:
1648 disable_8259A_irq(0);
1649 assign_irq_vector(0, TARGET_CPUS
);
1652 * As IRQ0 is to be enabled in the 8259A, the virtual
1653 * wire has to be disabled in the local APIC.
1655 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_EXTINT
);
1658 pin1
= find_isa_irq_pin(0, mp_INT
);
1659 apic1
= find_isa_irq_apic(0, mp_INT
);
1660 pin2
= ioapic_i8259
.pin
;
1661 apic2
= ioapic_i8259
.apic
;
1663 apic_printk(APIC_VERBOSE
,KERN_INFO
"..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
1664 cfg
->vector
, apic1
, pin1
, apic2
, pin2
);
1667 * Some BIOS writers are clueless and report the ExtINTA
1668 * I/O APIC input from the cascaded 8259A as the timer
1669 * interrupt input. So just in case, if only one pin
1670 * was found above, try it both directly and through the
1677 } else if (pin2
== -1) {
1684 * Ok, does IRQ0 through the IOAPIC work?
1687 add_pin_to_irq(0, apic1
, pin1
);
1688 setup_timer_IRQ0_pin(apic1
, pin1
, cfg
->vector
);
1690 unmask_IO_APIC_irq(0);
1691 if (!no_timer_check
&& timer_irq_works()) {
1692 nmi_watchdog_default();
1693 if (nmi_watchdog
== NMI_IO_APIC
) {
1695 enable_8259A_irq(0);
1697 if (disable_timer_pin_1
> 0)
1698 clear_IO_APIC_pin(0, pin1
);
1701 clear_IO_APIC_pin(apic1
, pin1
);
1703 apic_printk(APIC_QUIET
,KERN_ERR
"..MP-BIOS bug: "
1704 "8254 timer not connected to IO-APIC\n");
1706 apic_printk(APIC_VERBOSE
,KERN_INFO
1707 "...trying to set up timer (IRQ0) "
1708 "through the 8259A ... ");
1709 apic_printk(APIC_VERBOSE
,"\n..... (found apic %d pin %d) ...",
1712 * legacy devices should be connected to IO APIC #0
1714 /* replace_pin_at_irq(0, apic1, pin1, apic2, pin2); */
1715 setup_timer_IRQ0_pin(apic2
, pin2
, cfg
->vector
);
1716 unmask_IO_APIC_irq(0);
1717 enable_8259A_irq(0);
1718 if (timer_irq_works()) {
1719 apic_printk(APIC_VERBOSE
," works.\n");
1720 timer_through_8259
= 1;
1721 nmi_watchdog_default();
1722 if (nmi_watchdog
== NMI_IO_APIC
) {
1723 disable_8259A_irq(0);
1725 enable_8259A_irq(0);
1730 * Cleanup, just in case ...
1732 disable_8259A_irq(0);
1733 clear_IO_APIC_pin(apic2
, pin2
);
1734 apic_printk(APIC_VERBOSE
," failed.\n");
1737 if (nmi_watchdog
== NMI_IO_APIC
) {
1738 printk(KERN_WARNING
"timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
1739 nmi_watchdog
= NMI_NONE
;
1742 apic_printk(APIC_VERBOSE
, KERN_INFO
"...trying to set up timer as Virtual Wire IRQ...");
1744 irq_desc
[0].chip
= &lapic_irq_type
;
1745 apic_write(APIC_LVT0
, APIC_DM_FIXED
| cfg
->vector
); /* Fixed mode */
1746 enable_8259A_irq(0);
1748 if (timer_irq_works()) {
1749 apic_printk(APIC_VERBOSE
," works.\n");
1752 disable_8259A_irq(0);
1753 apic_write(APIC_LVT0
, APIC_LVT_MASKED
| APIC_DM_FIXED
| cfg
->vector
);
1754 apic_printk(APIC_VERBOSE
," failed.\n");
1756 apic_printk(APIC_VERBOSE
, KERN_INFO
"...trying to set up timer as ExtINT IRQ...");
1760 apic_write(APIC_LVT0
, APIC_DM_EXTINT
);
1762 unlock_ExtINT_logic();
1764 if (timer_irq_works()) {
1765 apic_printk(APIC_VERBOSE
," works.\n");
1768 apic_printk(APIC_VERBOSE
," failed :(.\n");
1769 panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
1771 local_irq_restore(flags
);
1774 static int __init
notimercheck(char *s
)
1779 __setup("no_timer_check", notimercheck
);
1783 * IRQs that are handled by the PIC in the MPS IOAPIC case.
1784 * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
1785 * Linux doesn't really care, as it's not actually used
1786 * for any interrupt handling anyway.
1788 #define PIC_IRQS (1<<2)
1790 void __init
setup_IO_APIC(void)
1794 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
1798 io_apic_irqs
= ~0; /* all IRQs go through IOAPIC */
1800 io_apic_irqs
= ~PIC_IRQS
;
1802 apic_printk(APIC_VERBOSE
, "ENABLING IO-APIC IRQs\n");
1805 setup_IO_APIC_irqs();
1806 init_IO_APIC_traps();
1812 struct sysfs_ioapic_data
{
1813 struct sys_device dev
;
1814 struct IO_APIC_route_entry entry
[0];
1816 static struct sysfs_ioapic_data
* mp_ioapic_data
[MAX_IO_APICS
];
1818 static int ioapic_suspend(struct sys_device
*dev
, pm_message_t state
)
1820 struct IO_APIC_route_entry
*entry
;
1821 struct sysfs_ioapic_data
*data
;
1824 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
1825 entry
= data
->entry
;
1826 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++, entry
++ )
1827 *entry
= ioapic_read_entry(dev
->id
, i
);
1832 static int ioapic_resume(struct sys_device
*dev
)
1834 struct IO_APIC_route_entry
*entry
;
1835 struct sysfs_ioapic_data
*data
;
1836 unsigned long flags
;
1837 union IO_APIC_reg_00 reg_00
;
1840 data
= container_of(dev
, struct sysfs_ioapic_data
, dev
);
1841 entry
= data
->entry
;
1843 spin_lock_irqsave(&ioapic_lock
, flags
);
1844 reg_00
.raw
= io_apic_read(dev
->id
, 0);
1845 if (reg_00
.bits
.ID
!= mp_ioapics
[dev
->id
].mpc_apicid
) {
1846 reg_00
.bits
.ID
= mp_ioapics
[dev
->id
].mpc_apicid
;
1847 io_apic_write(dev
->id
, 0, reg_00
.raw
);
1849 spin_unlock_irqrestore(&ioapic_lock
, flags
);
1850 for (i
= 0; i
< nr_ioapic_registers
[dev
->id
]; i
++)
1851 ioapic_write_entry(dev
->id
, i
, entry
[i
]);
1856 static struct sysdev_class ioapic_sysdev_class
= {
1858 .suspend
= ioapic_suspend
,
1859 .resume
= ioapic_resume
,
1862 static int __init
ioapic_init_sysfs(void)
1864 struct sys_device
* dev
;
1867 error
= sysdev_class_register(&ioapic_sysdev_class
);
1871 for (i
= 0; i
< nr_ioapics
; i
++ ) {
1872 size
= sizeof(struct sys_device
) + nr_ioapic_registers
[i
]
1873 * sizeof(struct IO_APIC_route_entry
);
1874 mp_ioapic_data
[i
] = kzalloc(size
, GFP_KERNEL
);
1875 if (!mp_ioapic_data
[i
]) {
1876 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
1879 dev
= &mp_ioapic_data
[i
]->dev
;
1881 dev
->cls
= &ioapic_sysdev_class
;
1882 error
= sysdev_register(dev
);
1884 kfree(mp_ioapic_data
[i
]);
1885 mp_ioapic_data
[i
] = NULL
;
1886 printk(KERN_ERR
"Can't suspend/resume IOAPIC %d\n", i
);
1894 device_initcall(ioapic_init_sysfs
);
1897 * Dynamic irq allocate and deallocation
1899 int create_irq(void)
1901 /* Allocate an unused irq */
1904 unsigned long flags
;
1907 spin_lock_irqsave(&vector_lock
, flags
);
1908 for (new = (NR_IRQS
- 1); new >= 0; new--) {
1909 if (platform_legacy_irq(new))
1911 if (irq_cfg
[new].vector
!= 0)
1913 if (__assign_irq_vector(new, TARGET_CPUS
) == 0)
1917 spin_unlock_irqrestore(&vector_lock
, flags
);
1920 dynamic_irq_init(irq
);
1925 void destroy_irq(unsigned int irq
)
1927 unsigned long flags
;
1929 dynamic_irq_cleanup(irq
);
1931 spin_lock_irqsave(&vector_lock
, flags
);
1932 __clear_irq_vector(irq
);
1933 spin_unlock_irqrestore(&vector_lock
, flags
);
1937 * MSI message composition
1939 #ifdef CONFIG_PCI_MSI
1940 static int msi_compose_msg(struct pci_dev
*pdev
, unsigned int irq
, struct msi_msg
*msg
)
1942 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
1948 err
= assign_irq_vector(irq
, tmp
);
1950 cpus_and(tmp
, cfg
->domain
, tmp
);
1951 dest
= cpu_mask_to_apicid(tmp
);
1953 msg
->address_hi
= MSI_ADDR_BASE_HI
;
1956 ((INT_DEST_MODE
== 0) ?
1957 MSI_ADDR_DEST_MODE_PHYSICAL
:
1958 MSI_ADDR_DEST_MODE_LOGICAL
) |
1959 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
1960 MSI_ADDR_REDIRECTION_CPU
:
1961 MSI_ADDR_REDIRECTION_LOWPRI
) |
1962 MSI_ADDR_DEST_ID(dest
);
1965 MSI_DATA_TRIGGER_EDGE
|
1966 MSI_DATA_LEVEL_ASSERT
|
1967 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
1968 MSI_DATA_DELIVERY_FIXED
:
1969 MSI_DATA_DELIVERY_LOWPRI
) |
1970 MSI_DATA_VECTOR(cfg
->vector
);
1976 static void set_msi_irq_affinity(unsigned int irq
, cpumask_t mask
)
1978 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
1983 cpus_and(tmp
, mask
, cpu_online_map
);
1984 if (cpus_empty(tmp
))
1987 if (assign_irq_vector(irq
, mask
))
1990 cpus_and(tmp
, cfg
->domain
, mask
);
1991 dest
= cpu_mask_to_apicid(tmp
);
1993 read_msi_msg(irq
, &msg
);
1995 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
1996 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
1997 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
1998 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
2000 write_msi_msg(irq
, &msg
);
2001 irq_desc
[irq
].affinity
= mask
;
2003 #endif /* CONFIG_SMP */
2006 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
2007 * which implement the MSI or MSI-X Capability Structure.
2009 static struct irq_chip msi_chip
= {
2011 .unmask
= unmask_msi_irq
,
2012 .mask
= mask_msi_irq
,
2013 .ack
= ack_apic_edge
,
2015 .set_affinity
= set_msi_irq_affinity
,
2017 .retrigger
= ioapic_retrigger_irq
,
2020 int arch_setup_msi_irq(struct pci_dev
*dev
, struct msi_desc
*desc
)
2028 ret
= msi_compose_msg(dev
, irq
, &msg
);
2034 set_irq_msi(irq
, desc
);
2035 write_msi_msg(irq
, &msg
);
2037 set_irq_chip_and_handler_name(irq
, &msi_chip
, handle_edge_irq
, "edge");
2042 void arch_teardown_msi_irq(unsigned int irq
)
2049 static void dmar_msi_set_affinity(unsigned int irq
, cpumask_t mask
)
2051 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
2056 cpus_and(tmp
, mask
, cpu_online_map
);
2057 if (cpus_empty(tmp
))
2060 if (assign_irq_vector(irq
, mask
))
2063 cpus_and(tmp
, cfg
->domain
, mask
);
2064 dest
= cpu_mask_to_apicid(tmp
);
2066 dmar_msi_read(irq
, &msg
);
2068 msg
.data
&= ~MSI_DATA_VECTOR_MASK
;
2069 msg
.data
|= MSI_DATA_VECTOR(cfg
->vector
);
2070 msg
.address_lo
&= ~MSI_ADDR_DEST_ID_MASK
;
2071 msg
.address_lo
|= MSI_ADDR_DEST_ID(dest
);
2073 dmar_msi_write(irq
, &msg
);
2074 irq_desc
[irq
].affinity
= mask
;
2076 #endif /* CONFIG_SMP */
2078 struct irq_chip dmar_msi_type
= {
2080 .unmask
= dmar_msi_unmask
,
2081 .mask
= dmar_msi_mask
,
2082 .ack
= ack_apic_edge
,
2084 .set_affinity
= dmar_msi_set_affinity
,
2086 .retrigger
= ioapic_retrigger_irq
,
2089 int arch_setup_dmar_msi(unsigned int irq
)
2094 ret
= msi_compose_msg(NULL
, irq
, &msg
);
2097 dmar_msi_write(irq
, &msg
);
2098 set_irq_chip_and_handler_name(irq
, &dmar_msi_type
, handle_edge_irq
,
2104 #endif /* CONFIG_PCI_MSI */
2106 * Hypertransport interrupt support
2108 #ifdef CONFIG_HT_IRQ
2112 static void target_ht_irq(unsigned int irq
, unsigned int dest
, u8 vector
)
2114 struct ht_irq_msg msg
;
2115 fetch_ht_irq_msg(irq
, &msg
);
2117 msg
.address_lo
&= ~(HT_IRQ_LOW_VECTOR_MASK
| HT_IRQ_LOW_DEST_ID_MASK
);
2118 msg
.address_hi
&= ~(HT_IRQ_HIGH_DEST_ID_MASK
);
2120 msg
.address_lo
|= HT_IRQ_LOW_VECTOR(vector
) | HT_IRQ_LOW_DEST_ID(dest
);
2121 msg
.address_hi
|= HT_IRQ_HIGH_DEST_ID(dest
);
2123 write_ht_irq_msg(irq
, &msg
);
2126 static void set_ht_irq_affinity(unsigned int irq
, cpumask_t mask
)
2128 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
2132 cpus_and(tmp
, mask
, cpu_online_map
);
2133 if (cpus_empty(tmp
))
2136 if (assign_irq_vector(irq
, mask
))
2139 cpus_and(tmp
, cfg
->domain
, mask
);
2140 dest
= cpu_mask_to_apicid(tmp
);
2142 target_ht_irq(irq
, dest
, cfg
->vector
);
2143 irq_desc
[irq
].affinity
= mask
;
2147 static struct irq_chip ht_irq_chip
= {
2149 .mask
= mask_ht_irq
,
2150 .unmask
= unmask_ht_irq
,
2151 .ack
= ack_apic_edge
,
2153 .set_affinity
= set_ht_irq_affinity
,
2155 .retrigger
= ioapic_retrigger_irq
,
2158 int arch_setup_ht_irq(unsigned int irq
, struct pci_dev
*dev
)
2160 struct irq_cfg
*cfg
= irq_cfg
+ irq
;
2165 err
= assign_irq_vector(irq
, tmp
);
2167 struct ht_irq_msg msg
;
2170 cpus_and(tmp
, cfg
->domain
, tmp
);
2171 dest
= cpu_mask_to_apicid(tmp
);
2173 msg
.address_hi
= HT_IRQ_HIGH_DEST_ID(dest
);
2177 HT_IRQ_LOW_DEST_ID(dest
) |
2178 HT_IRQ_LOW_VECTOR(cfg
->vector
) |
2179 ((INT_DEST_MODE
== 0) ?
2180 HT_IRQ_LOW_DM_PHYSICAL
:
2181 HT_IRQ_LOW_DM_LOGICAL
) |
2182 HT_IRQ_LOW_RQEOI_EDGE
|
2183 ((INT_DELIVERY_MODE
!= dest_LowestPrio
) ?
2184 HT_IRQ_LOW_MT_FIXED
:
2185 HT_IRQ_LOW_MT_ARBITRATED
) |
2186 HT_IRQ_LOW_IRQ_MASKED
;
2188 write_ht_irq_msg(irq
, &msg
);
2190 set_irq_chip_and_handler_name(irq
, &ht_irq_chip
,
2191 handle_edge_irq
, "edge");
2195 #endif /* CONFIG_HT_IRQ */
2197 /* --------------------------------------------------------------------------
2198 ACPI-based IOAPIC Configuration
2199 -------------------------------------------------------------------------- */
2203 #define IO_APIC_MAX_ID 0xFE
2205 int __init
io_apic_get_redir_entries (int ioapic
)
2207 union IO_APIC_reg_01 reg_01
;
2208 unsigned long flags
;
2210 spin_lock_irqsave(&ioapic_lock
, flags
);
2211 reg_01
.raw
= io_apic_read(ioapic
, 1);
2212 spin_unlock_irqrestore(&ioapic_lock
, flags
);
2214 return reg_01
.bits
.entries
;
2218 int io_apic_set_pci_routing (int ioapic
, int pin
, int irq
, int triggering
, int polarity
)
2220 if (!IO_APIC_IRQ(irq
)) {
2221 apic_printk(APIC_QUIET
,KERN_ERR
"IOAPIC[%d]: Invalid reference to IRQ 0\n",
2227 * IRQs < 16 are already in the irq_2_pin[] map
2230 add_pin_to_irq(irq
, ioapic
, pin
);
2232 setup_IO_APIC_irq(ioapic
, pin
, irq
, triggering
, polarity
);
2238 int acpi_get_override_irq(int bus_irq
, int *trigger
, int *polarity
)
2242 if (skip_ioapic_setup
)
2245 for (i
= 0; i
< mp_irq_entries
; i
++)
2246 if (mp_irqs
[i
].mpc_irqtype
== mp_INT
&&
2247 mp_irqs
[i
].mpc_srcbusirq
== bus_irq
)
2249 if (i
>= mp_irq_entries
)
2252 *trigger
= irq_trigger(i
);
2253 *polarity
= irq_polarity(i
);
2257 #endif /* CONFIG_ACPI */
2260 * This function currently is only a helper for the i386 smp boot process where
2261 * we need to reprogram the ioredtbls to cater for the cpus which have come online
2262 * so mask in all cases should simply be TARGET_CPUS
2265 void __init
setup_ioapic_dest(void)
2267 int pin
, ioapic
, irq
, irq_entry
;
2269 if (skip_ioapic_setup
== 1)
2272 for (ioapic
= 0; ioapic
< nr_ioapics
; ioapic
++) {
2273 for (pin
= 0; pin
< nr_ioapic_registers
[ioapic
]; pin
++) {
2274 irq_entry
= find_irq_entry(ioapic
, pin
, mp_INT
);
2275 if (irq_entry
== -1)
2277 irq
= pin_2_irq(irq_entry
, ioapic
, pin
);
2279 /* setup_IO_APIC_irqs could fail to get vector for some device
2280 * when you have too many devices, because at that time only boot
2283 if (!irq_cfg
[irq
].vector
)
2284 setup_IO_APIC_irq(ioapic
, pin
, irq
,
2285 irq_trigger(irq_entry
),
2286 irq_polarity(irq_entry
));
2288 set_ioapic_affinity_irq(irq
, TARGET_CPUS
);
2295 #define IOAPIC_RESOURCE_NAME_SIZE 11
2297 static struct resource
*ioapic_resources
;
2299 static struct resource
* __init
ioapic_setup_resources(void)
2302 struct resource
*res
;
2306 if (nr_ioapics
<= 0)
2309 n
= IOAPIC_RESOURCE_NAME_SIZE
+ sizeof(struct resource
);
2312 mem
= alloc_bootmem(n
);
2316 mem
+= sizeof(struct resource
) * nr_ioapics
;
2318 for (i
= 0; i
< nr_ioapics
; i
++) {
2320 res
[i
].flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
2321 sprintf(mem
, "IOAPIC %u", i
);
2322 mem
+= IOAPIC_RESOURCE_NAME_SIZE
;
2326 ioapic_resources
= res
;
2331 void __init
ioapic_init_mappings(void)
2333 unsigned long ioapic_phys
, idx
= FIX_IO_APIC_BASE_0
;
2334 struct resource
*ioapic_res
;
2337 ioapic_res
= ioapic_setup_resources();
2338 for (i
= 0; i
< nr_ioapics
; i
++) {
2339 if (smp_found_config
) {
2340 ioapic_phys
= mp_ioapics
[i
].mpc_apicaddr
;
2342 ioapic_phys
= (unsigned long)
2343 alloc_bootmem_pages(PAGE_SIZE
);
2344 ioapic_phys
= __pa(ioapic_phys
);
2346 set_fixmap_nocache(idx
, ioapic_phys
);
2347 apic_printk(APIC_VERBOSE
,
2348 "mapped IOAPIC to %016lx (%016lx)\n",
2349 __fix_to_virt(idx
), ioapic_phys
);
2352 if (ioapic_res
!= NULL
) {
2353 ioapic_res
->start
= ioapic_phys
;
2354 ioapic_res
->end
= ioapic_phys
+ (4 * 1024) - 1;
2360 static int __init
ioapic_insert_resources(void)
2363 struct resource
*r
= ioapic_resources
;
2367 "IO APIC resources could be not be allocated.\n");
2371 for (i
= 0; i
< nr_ioapics
; i
++) {
2372 insert_resource(&iomem_resource
, r
);
2379 /* Insert the IO APIC resources after PCI initialization has occured to handle
2380 * IO APICS that are mapped in on a BAR in PCI space. */
2381 late_initcall(ioapic_insert_resources
);