1 #include <linux/linkage.h>
2 #include <linux/errno.h>
3 #include <linux/signal.h>
4 #include <linux/sched.h>
5 #include <linux/ioport.h>
6 #include <linux/interrupt.h>
7 #include <linux/timex.h>
8 #include <linux/slab.h>
9 #include <linux/random.h>
10 #include <linux/init.h>
11 #include <linux/kernel_stat.h>
12 #include <linux/sysdev.h>
13 #include <linux/bitops.h>
16 #include <asm/atomic.h>
17 #include <asm/system.h>
19 #include <asm/hw_irq.h>
20 #include <asm/pgtable.h>
21 #include <asm/delay.h>
24 #include <asm/i8259.h>
27 * ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
28 * (these are usually mapped to vectors 0x30-0x3f)
32 * The IO-APIC gives us many more interrupt sources. Most of these
33 * are unused but an SMP system is supposed to have enough memory ...
34 * sometimes (mostly wrt. hw bugs) we get corrupted vectors all
35 * across the spectrum, so we really want to be prepared to get all
36 * of these. Plus, more powerful systems might have more than 64
39 * (these are usually mapped into the 0x30-0xff vector range)
43 * IRQ2 is cascade interrupt to second interrupt controller
46 static struct irqaction irq2
= {
48 .mask
= CPU_MASK_NONE
,
51 DEFINE_PER_CPU(vector_irq_t
, vector_irq
) = {
52 [0 ... IRQ0_VECTOR
- 1] = -1,
69 [IRQ15_VECTOR
+ 1 ... NR_VECTORS
- 1] = -1
72 void __init
init_ISA_irqs(void)
79 for (i
= 0; i
< 16; i
++) {
80 /* first time call this irq_desc */
81 struct irq_desc
*desc
= irq_to_desc(i
);
83 desc
->status
= IRQ_DISABLED
;
88 * 16 old-style INTA-cycle interrupts:
90 set_irq_chip_and_handler_name(i
, &i8259A_chip
,
91 handle_level_irq
, "XT");
95 void init_IRQ(void) __attribute__((weak
, alias("native_init_IRQ")));
97 static void __init
smp_intr_init(void)
101 * The reschedule interrupt is a CPU-to-CPU reschedule-helper
102 * IPI, driven by wakeup.
104 alloc_intr_gate(RESCHEDULE_VECTOR
, reschedule_interrupt
);
106 /* IPIs for invalidation */
107 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+0, invalidate_interrupt0
);
108 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+1, invalidate_interrupt1
);
109 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+2, invalidate_interrupt2
);
110 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+3, invalidate_interrupt3
);
111 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+4, invalidate_interrupt4
);
112 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+5, invalidate_interrupt5
);
113 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+6, invalidate_interrupt6
);
114 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+7, invalidate_interrupt7
);
116 /* IPI for generic function call */
117 alloc_intr_gate(CALL_FUNCTION_VECTOR
, call_function_interrupt
);
119 /* IPI for generic single function call */
120 alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR
,
121 call_function_single_interrupt
);
123 /* Low priority IPI to cleanup after moving an irq */
124 set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR
, irq_move_cleanup_interrupt
);
128 static void __init
apic_intr_init(void)
132 alloc_intr_gate(THERMAL_APIC_VECTOR
, thermal_interrupt
);
133 alloc_intr_gate(THRESHOLD_APIC_VECTOR
, threshold_interrupt
);
135 /* self generated IPI for local APIC timer */
136 alloc_intr_gate(LOCAL_TIMER_VECTOR
, apic_timer_interrupt
);
138 /* IPI vectors for APIC spurious and error interrupts */
139 alloc_intr_gate(SPURIOUS_APIC_VECTOR
, spurious_interrupt
);
140 alloc_intr_gate(ERROR_APIC_VECTOR
, error_interrupt
);
143 void __init
native_init_IRQ(void)
149 * Cover the whole vector space, no vector can escape
150 * us. (some of these will be overridden and become
151 * 'special' SMP interrupts)
153 for (i
= 0; i
< (NR_VECTORS
- FIRST_EXTERNAL_VECTOR
); i
++) {
154 int vector
= FIRST_EXTERNAL_VECTOR
+ i
;
155 if (vector
!= IA32_SYSCALL_VECTOR
)
156 set_intr_gate(vector
, interrupt
[i
]);