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>
13 #include <linux/delay.h>
15 #include <asm/atomic.h>
16 #include <asm/system.h>
17 #include <asm/timer.h>
18 #include <asm/pgtable.h>
21 #include <asm/arch_hooks.h>
22 #include <asm/i8259.h>
23 #include <asm/traps.h>
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.
33 * Careful.. Not only is IRQ13 unreliable, but it is also
34 * leads to races. IBM designers who came up with it should
38 static irqreturn_t math_error_irq(int cpl, void *dev_id)
41 if (ignore_fpu_irq || !boot_cpu_data.hard_math)
43 math_error((void __user *)get_irq_regs()->ip);
48 * New motherboards sometimes make IRQ 13 be a PCI interrupt,
49 * so allow interrupt sharing.
51 static struct irqaction fpu_irq = {
52 .handler = math_error_irq,
53 .mask = CPU_MASK_NONE,
57 void __init init_ISA_irqs(void)
61 #ifdef CONFIG_X86_LOCAL_APIC
67 * 16 old-style INTA-cycle interrupts:
69 for (i = 0; i < NR_IRQS_LEGACY; i++) {
70 struct irq_desc *desc = irq_to_desc(i);
72 desc->status = IRQ_DISABLED;
76 set_irq_chip_and_handler_name(i, &i8259A_chip,
77 handle_level_irq, "XT");
82 * IRQ2 is cascade interrupt to second interrupt controller
84 static struct irqaction irq2 = {
86 .mask = CPU_MASK_NONE,
90 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
91 [0 ... IRQ0_VECTOR - 1] = -1,
108 [IRQ15_VECTOR + 1 ... NR_VECTORS - 1] = -1
111 int vector_used_by_percpu_irq(unsigned int vector)
115 for_each_online_cpu(cpu) {
116 if (per_cpu(vector_irq, cpu)[vector] != -1)
123 /* Overridden in paravirt.c */
124 void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
126 void __init native_init_IRQ(void)
130 /* all the set up before the call gates are initialised */
131 pre_intr_init_hook();
134 * Cover the whole vector space, no vector can escape
135 * us. (some of these will be overridden and become
136 * 'special' SMP interrupts)
138 for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) {
139 /* SYSCALL_VECTOR was reserved in trap_init. */
140 if (i != SYSCALL_VECTOR)
141 set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]);
145 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_SMP)
147 * The reschedule interrupt is a CPU-to-CPU reschedule-helper
148 * IPI, driven by wakeup.
150 alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
152 /* IPIs for invalidation */
153 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+0, invalidate_interrupt0);
154 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+1, invalidate_interrupt1);
155 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+2, invalidate_interrupt2);
156 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+3, invalidate_interrupt3);
157 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+4, invalidate_interrupt4);
158 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+5, invalidate_interrupt5);
159 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+6, invalidate_interrupt6);
160 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+7, invalidate_interrupt7);
162 /* IPI for generic function call */
163 alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
165 /* IPI for single call function */
166 alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
167 call_function_single_interrupt);
169 /* Low priority IPI to cleanup after moving an irq */
170 set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
171 set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
174 #ifdef CONFIG_X86_LOCAL_APIC
175 /* self generated IPI for local APIC timer */
176 alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
178 /* IPI vectors for APIC spurious and error interrupts */
179 alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
180 alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
183 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_MCE_P4THERMAL)
184 /* thermal monitor LVT interrupt */
185 alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
191 /* setup after call gates are initialised (usually add in
192 * the architecture specific gates)
197 * External FPU? Set up irq13 if so, for
198 * original braindamaged IBM FERR coupling.
200 if (boot_cpu_data.hard_math && !cpu_has_fpu)
201 setup_irq(FPU_IRQ, &fpu_irq);
203 irq_ctx_init(smp_processor_id());