1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/linkage.h>
3 #include <linux/errno.h>
4 #include <linux/signal.h>
5 #include <linux/sched.h>
6 #include <linux/ioport.h>
7 #include <linux/interrupt.h>
9 #include <linux/timex.h>
10 #include <linux/random.h>
11 #include <linux/kprobes.h>
12 #include <linux/init.h>
13 #include <linux/kernel_stat.h>
14 #include <linux/device.h>
15 #include <linux/bitops.h>
16 #include <linux/acpi.h>
18 #include <linux/delay.h>
20 #include <linux/atomic.h>
21 #include <asm/timer.h>
22 #include <asm/hw_irq.h>
23 #include <asm/pgtable.h>
26 #include <asm/setup.h>
27 #include <asm/i8259.h>
28 #include <asm/traps.h>
32 * ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
33 * (these are usually mapped to vectors 0x30-0x3f)
37 * The IO-APIC gives us many more interrupt sources. Most of these
38 * are unused but an SMP system is supposed to have enough memory ...
39 * sometimes (mostly wrt. hw bugs) we get corrupted vectors all
40 * across the spectrum, so we really want to be prepared to get all
41 * of these. Plus, more powerful systems might have more than 64
44 * (these are usually mapped into the 0x30-0xff vector range)
48 * IRQ2 is cascade interrupt to second interrupt controller
50 static struct irqaction irq2
= {
53 .flags
= IRQF_NO_THREAD
,
56 DEFINE_PER_CPU(vector_irq_t
, vector_irq
) = {
57 [0 ... NR_VECTORS
- 1] = VECTOR_UNUSED
,
60 void __init
init_ISA_irqs(void)
62 struct irq_chip
*chip
= legacy_pic
->chip
;
65 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
70 for (i
= 0; i
< nr_legacy_irqs(); i
++)
71 irq_set_chip_and_handler(i
, chip
, handle_level_irq
);
74 void __init
init_IRQ(void)
79 * On cpu 0, Assign ISA_IRQ_VECTOR(irq) to IRQ 0..15.
80 * If these IRQ's are handled by legacy interrupt-controllers like PIC,
81 * then this configuration will likely be static after the boot. If
82 * these IRQ's are handled by more mordern controllers like IO-APIC,
83 * then this vector space can be freed and re-used dynamically as the
86 for (i
= 0; i
< nr_legacy_irqs(); i
++)
87 per_cpu(vector_irq
, 0)[ISA_IRQ_VECTOR(i
)] = irq_to_desc(i
);
89 x86_init
.irqs
.intr_init();
92 void __init
native_init_IRQ(void)
94 /* Execute any quirks before the call gates are initialised: */
95 x86_init
.irqs
.pre_vector_init();
97 idt_setup_apic_and_irq_gates();
99 if (!acpi_ioapic
&& !of_ioapic
&& nr_legacy_irqs())
102 irq_ctx_init(smp_processor_id());