1 #include <linux/errno.h>
2 #include <linux/signal.h>
3 #include <linux/sched.h>
4 #include <linux/ioport.h>
5 #include <linux/interrupt.h>
6 #include <linux/slab.h>
7 #include <linux/random.h>
8 #include <linux/init.h>
9 #include <linux/kernel_stat.h>
10 #include <linux/sysdev.h>
11 #include <linux/bitops.h>
12 #include <linux/io.h>
13 #include <linux/delay.h>
14
15 #include <asm/atomic.h>
16 #include <asm/system.h>
17 #include <asm/timer.h>
18 #include <asm/pgtable.h>
19 #include <asm/desc.h>
20 #include <asm/apic.h>
21 #include <asm/arch_hooks.h>
22 #include <asm/i8259.h>
23 #include <asm/traps.h>
24
25
26 /*
27 * Note that on a 486, we don't want to do a SIGFPE on an irq13
28 * as the irq is unreliable, and exception 16 works correctly
29 * (ie as explained in the intel literature). On a 386, you
30 * can't use exception 16 due to bad IBM design, so we have to
31 * rely on the less exact irq13.
32 *
33 * Careful.. Not only is IRQ13 unreliable, but it is also
34 * leads to races. IBM designers who came up with it should
35 * be shot.
36 */
37
math_error_irq(int cpl,void * dev_id)38 static irqreturn_t math_error_irq(int cpl, void *dev_id)
39 {
40 outb(0, 0xF0);
41 if (ignore_fpu_irq || !boot_cpu_data.hard_math)
42 return IRQ_NONE;
43 math_error((void __user *)get_irq_regs()->ip);
44 return IRQ_HANDLED;
45 }
46
47 /*
48 * New motherboards sometimes make IRQ 13 be a PCI interrupt,
49 * so allow interrupt sharing.
50 */
51 static struct irqaction fpu_irq = {
52 .handler = math_error_irq,
53 .mask = CPU_MASK_NONE,
54 .name = "fpu",
55 };
56
init_ISA_irqs(void)57 void __init init_ISA_irqs(void)
58 {
59 int i;
60
61 #ifdef CONFIG_X86_LOCAL_APIC
62 init_bsp_APIC();
63 #endif
64 init_8259A(0);
65
66 /*
67 * 16 old-style INTA-cycle interrupts:
68 */
69 for (i = 0; i < NR_IRQS_LEGACY; i++) {
70 struct irq_desc *desc = irq_to_desc(i);
71
72 desc->status = IRQ_DISABLED;
73 desc->action = NULL;
74 desc->depth = 1;
75
76 set_irq_chip_and_handler_name(i, &i8259A_chip,
77 handle_level_irq, "XT");
78 }
79 }
80
81 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
82 [0 ... IRQ0_VECTOR - 1] = -1,
83 [IRQ0_VECTOR] = 0,
84 [IRQ1_VECTOR] = 1,
85 [IRQ2_VECTOR] = 2,
86 [IRQ3_VECTOR] = 3,
87 [IRQ4_VECTOR] = 4,
88 [IRQ5_VECTOR] = 5,
89 [IRQ6_VECTOR] = 6,
90 [IRQ7_VECTOR] = 7,
91 [IRQ8_VECTOR] = 8,
92 [IRQ9_VECTOR] = 9,
93 [IRQ10_VECTOR] = 10,
94 [IRQ11_VECTOR] = 11,
95 [IRQ12_VECTOR] = 12,
96 [IRQ13_VECTOR] = 13,
97 [IRQ14_VECTOR] = 14,
98 [IRQ15_VECTOR] = 15,
99 [IRQ15_VECTOR + 1 ... NR_VECTORS - 1] = -1
100 };
101
vector_used_by_percpu_irq(unsigned int vector)102 int vector_used_by_percpu_irq(unsigned int vector)
103 {
104 int cpu;
105
106 for_each_online_cpu(cpu) {
107 if (per_cpu(vector_irq, cpu)[vector] != -1)
108 return 1;
109 }
110
111 return 0;
112 }
113
114 /* Overridden in paravirt.c */
115 void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
116
native_init_IRQ(void)117 void __init native_init_IRQ(void)
118 {
119 int i;
120
121 /* all the set up before the call gates are initialised */
122 pre_intr_init_hook();
123
124 /*
125 * Cover the whole vector space, no vector can escape
126 * us. (some of these will be overridden and become
127 * 'special' SMP interrupts)
128 */
129 for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) {
130 /* SYSCALL_VECTOR was reserved in trap_init. */
131 if (i != SYSCALL_VECTOR)
132 set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]);
133 }
134
135
136 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_SMP)
137 /*
138 * The reschedule interrupt is a CPU-to-CPU reschedule-helper
139 * IPI, driven by wakeup.
140 */
141 alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
142
143 /* IPI for invalidation */
144 alloc_intr_gate(INVALIDATE_TLB_VECTOR, invalidate_interrupt);
145
146 /* IPI for generic function call */
147 alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
148
149 /* IPI for single call function */
150 alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
151 call_function_single_interrupt);
152
153 /* Low priority IPI to cleanup after moving an irq */
154 set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
155 set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
156 #endif
157
158 #ifdef CONFIG_X86_LOCAL_APIC
159 /* self generated IPI for local APIC timer */
160 alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
161
162 /* IPI vectors for APIC spurious and error interrupts */
163 alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
164 alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
165 #endif
166
167 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_MCE_P4THERMAL)
168 /* thermal monitor LVT interrupt */
169 alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
170 #endif
171
172 /* setup after call gates are initialised (usually add in
173 * the architecture specific gates)
174 */
175 intr_init_hook();
176
177 /*
178 * External FPU? Set up irq13 if so, for
179 * original braindamaged IBM FERR coupling.
180 */
181 if (boot_cpu_data.hard_math && !cpu_has_fpu)
182 setup_irq(FPU_IRQ, &fpu_irq);
183
184 irq_ctx_init(smp_processor_id());
185 }
186