178 строки
4.5 KiB
C
178 строки
4.5 KiB
C
#include <linux/linkage.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/random.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/sysdev.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/io.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <asm/atomic.h>
|
|
#include <asm/system.h>
|
|
#include <asm/hw_irq.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/desc.h>
|
|
#include <asm/apic.h>
|
|
#include <asm/i8259.h>
|
|
|
|
/*
|
|
* ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
|
|
* (these are usually mapped to vectors 0x30-0x3f)
|
|
*/
|
|
|
|
/*
|
|
* The IO-APIC gives us many more interrupt sources. Most of these
|
|
* are unused but an SMP system is supposed to have enough memory ...
|
|
* sometimes (mostly wrt. hw bugs) we get corrupted vectors all
|
|
* across the spectrum, so we really want to be prepared to get all
|
|
* of these. Plus, more powerful systems might have more than 64
|
|
* IO-APIC registers.
|
|
*
|
|
* (these are usually mapped into the 0x30-0xff vector range)
|
|
*/
|
|
|
|
/*
|
|
* IRQ2 is cascade interrupt to second interrupt controller
|
|
*/
|
|
|
|
static struct irqaction irq2 = {
|
|
.handler = no_action,
|
|
.name = "cascade",
|
|
};
|
|
DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
|
|
[0 ... IRQ0_VECTOR - 1] = -1,
|
|
[IRQ0_VECTOR] = 0,
|
|
[IRQ1_VECTOR] = 1,
|
|
[IRQ2_VECTOR] = 2,
|
|
[IRQ3_VECTOR] = 3,
|
|
[IRQ4_VECTOR] = 4,
|
|
[IRQ5_VECTOR] = 5,
|
|
[IRQ6_VECTOR] = 6,
|
|
[IRQ7_VECTOR] = 7,
|
|
[IRQ8_VECTOR] = 8,
|
|
[IRQ9_VECTOR] = 9,
|
|
[IRQ10_VECTOR] = 10,
|
|
[IRQ11_VECTOR] = 11,
|
|
[IRQ12_VECTOR] = 12,
|
|
[IRQ13_VECTOR] = 13,
|
|
[IRQ14_VECTOR] = 14,
|
|
[IRQ15_VECTOR] = 15,
|
|
[IRQ15_VECTOR + 1 ... NR_VECTORS - 1] = -1
|
|
};
|
|
|
|
int vector_used_by_percpu_irq(unsigned int vector)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_online_cpu(cpu) {
|
|
if (per_cpu(vector_irq, cpu)[vector] != -1)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __init init_ISA_irqs(void)
|
|
{
|
|
int i;
|
|
|
|
init_bsp_APIC();
|
|
init_8259A(0);
|
|
|
|
for (i = 0; i < NR_IRQS_LEGACY; i++) {
|
|
struct irq_desc *desc = irq_to_desc(i);
|
|
|
|
desc->status = IRQ_DISABLED;
|
|
desc->action = NULL;
|
|
desc->depth = 1;
|
|
|
|
/*
|
|
* 16 old-style INTA-cycle interrupts:
|
|
*/
|
|
set_irq_chip_and_handler_name(i, &i8259A_chip,
|
|
handle_level_irq, "XT");
|
|
}
|
|
}
|
|
|
|
void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
|
|
|
|
static void __init smp_intr_init(void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* The reschedule interrupt is a CPU-to-CPU reschedule-helper
|
|
* IPI, driven by wakeup.
|
|
*/
|
|
alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
|
|
|
|
/* IPIs for invalidation */
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+0, invalidate_interrupt0);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+1, invalidate_interrupt1);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+2, invalidate_interrupt2);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+3, invalidate_interrupt3);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+4, invalidate_interrupt4);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+5, invalidate_interrupt5);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+6, invalidate_interrupt6);
|
|
alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+7, invalidate_interrupt7);
|
|
|
|
/* IPI for generic function call */
|
|
alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
|
|
|
|
/* IPI for generic single function call */
|
|
alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
|
|
call_function_single_interrupt);
|
|
|
|
/* Low priority IPI to cleanup after moving an irq */
|
|
set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
|
|
set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
|
|
#endif
|
|
}
|
|
|
|
static void __init apic_intr_init(void)
|
|
{
|
|
smp_intr_init();
|
|
|
|
alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
|
|
alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
|
|
|
|
/* self generated IPI for local APIC timer */
|
|
alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
|
|
|
|
/* generic IPI for platform specific use */
|
|
alloc_intr_gate(GENERIC_INTERRUPT_VECTOR, generic_interrupt);
|
|
|
|
/* IPI vectors for APIC spurious and error interrupts */
|
|
alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
|
|
alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
|
|
}
|
|
|
|
void __init native_init_IRQ(void)
|
|
{
|
|
int i;
|
|
|
|
init_ISA_irqs();
|
|
/*
|
|
* Cover the whole vector space, no vector can escape
|
|
* us. (some of these will be overridden and become
|
|
* 'special' SMP interrupts)
|
|
*/
|
|
for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
|
|
int vector = FIRST_EXTERNAL_VECTOR + i;
|
|
if (vector != IA32_SYSCALL_VECTOR)
|
|
set_intr_gate(vector, interrupt[i]);
|
|
}
|
|
|
|
apic_intr_init();
|
|
|
|
if (!acpi_ioapic)
|
|
setup_irq(2, &irq2);
|
|
}
|