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Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6
[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / irqinit_64.c
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>
14
15 #include <asm/acpi.h>
16 #include <asm/atomic.h>
17 #include <asm/system.h>
18 #include <asm/io.h>
19 #include <asm/hw_irq.h>
20 #include <asm/pgtable.h>
21 #include <asm/delay.h>
22 #include <asm/desc.h>
23 #include <asm/apic.h>
24 #include <asm/i8259.h>
25
26 /*
27  * ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
28  * (these are usually mapped to vectors 0x30-0x3f)
29  */
30
31 /*
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
37  * IO-APIC registers.
38  *
39  * (these are usually mapped into the 0x30-0xff vector range)
40  */
41
42 /*
43  * IRQ2 is cascade interrupt to second interrupt controller
44  */
45
46 static struct irqaction irq2 = {
47         .handler = no_action,
48         .mask = CPU_MASK_NONE,
49         .name = "cascade",
50 };
51 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
52         [0 ... IRQ0_VECTOR - 1] = -1,
53         [IRQ0_VECTOR] = 0,
54         [IRQ1_VECTOR] = 1,
55         [IRQ2_VECTOR] = 2,
56         [IRQ3_VECTOR] = 3,
57         [IRQ4_VECTOR] = 4,
58         [IRQ5_VECTOR] = 5,
59         [IRQ6_VECTOR] = 6,
60         [IRQ7_VECTOR] = 7,
61         [IRQ8_VECTOR] = 8,
62         [IRQ9_VECTOR] = 9,
63         [IRQ10_VECTOR] = 10,
64         [IRQ11_VECTOR] = 11,
65         [IRQ12_VECTOR] = 12,
66         [IRQ13_VECTOR] = 13,
67         [IRQ14_VECTOR] = 14,
68         [IRQ15_VECTOR] = 15,
69         [IRQ15_VECTOR + 1 ... NR_VECTORS - 1] = -1
70 };
71
72 int vector_used_by_percpu_irq(unsigned int vector)
73 {
74         int cpu;
75
76         for_each_online_cpu(cpu) {
77                 if (per_cpu(vector_irq, cpu)[vector] != -1)
78                         return 1;
79         }
80
81         return 0;
82 }
83
84 void __init init_ISA_irqs(void)
85 {
86         int i;
87
88         init_bsp_APIC();
89         init_8259A(0);
90
91         for (i = 0; i < NR_IRQS_LEGACY; i++) {
92                 struct irq_desc *desc = irq_to_desc(i);
93
94                 desc->status = IRQ_DISABLED;
95                 desc->action = NULL;
96                 desc->depth = 1;
97
98                 /*
99                  * 16 old-style INTA-cycle interrupts:
100                  */
101                 set_irq_chip_and_handler_name(i, &i8259A_chip,
102                                                       handle_level_irq, "XT");
103         }
104 }
105
106 void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
107
108 static void __init smp_intr_init(void)
109 {
110 #ifdef CONFIG_SMP
111         /*
112          * The reschedule interrupt is a CPU-to-CPU reschedule-helper
113          * IPI, driven by wakeup.
114          */
115         alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
116
117         /* IPIs for invalidation */
118         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+0, invalidate_interrupt0);
119         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+1, invalidate_interrupt1);
120         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+2, invalidate_interrupt2);
121         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+3, invalidate_interrupt3);
122         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+4, invalidate_interrupt4);
123         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+5, invalidate_interrupt5);
124         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+6, invalidate_interrupt6);
125         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+7, invalidate_interrupt7);
126
127         /* IPI for generic function call */
128         alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
129
130         /* IPI for generic single function call */
131         alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
132                         call_function_single_interrupt);
133
134         /* Low priority IPI to cleanup after moving an irq */
135         set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
136         set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
137 #endif
138 }
139
140 static void __init apic_intr_init(void)
141 {
142         smp_intr_init();
143
144         alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
145         alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
146
147         /* self generated IPI for local APIC timer */
148         alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
149
150         /* IPI vectors for APIC spurious and error interrupts */
151         alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
152         alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
153 }
154
155 void __init native_init_IRQ(void)
156 {
157         int i;
158
159         init_ISA_irqs();
160         /*
161          * Cover the whole vector space, no vector can escape
162          * us. (some of these will be overridden and become
163          * 'special' SMP interrupts)
164          */
165         for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
166                 int vector = FIRST_EXTERNAL_VECTOR + i;
167                 if (vector != IA32_SYSCALL_VECTOR)
168                         set_intr_gate(vector, interrupt[i]);
169         }
170
171         apic_intr_init();
172
173         if (!acpi_ioapic)
174                 setup_irq(2, &irq2);
175 }