forked from Minki/linux
f20b11e716
The leftovers of the i8259 unification have nothing to do with i8259 at all. They contain interrupt init code and the i8259_xx name is just misleading now. Rename them to initirq_32/64.c Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
#include <linux/errno.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/interrupt.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 <asm/atomic.h>
|
|
#include <asm/system.h>
|
|
#include <asm/io.h>
|
|
#include <asm/timer.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/delay.h>
|
|
#include <asm/desc.h>
|
|
#include <asm/apic.h>
|
|
#include <asm/arch_hooks.h>
|
|
#include <asm/i8259.h>
|
|
|
|
|
|
|
|
/*
|
|
* Note that on a 486, we don't want to do a SIGFPE on an irq13
|
|
* as the irq is unreliable, and exception 16 works correctly
|
|
* (ie as explained in the intel literature). On a 386, you
|
|
* can't use exception 16 due to bad IBM design, so we have to
|
|
* rely on the less exact irq13.
|
|
*
|
|
* Careful.. Not only is IRQ13 unreliable, but it is also
|
|
* leads to races. IBM designers who came up with it should
|
|
* be shot.
|
|
*/
|
|
|
|
|
|
static irqreturn_t math_error_irq(int cpl, void *dev_id)
|
|
{
|
|
extern void math_error(void __user *);
|
|
outb(0,0xF0);
|
|
if (ignore_fpu_irq || !boot_cpu_data.hard_math)
|
|
return IRQ_NONE;
|
|
math_error((void __user *)get_irq_regs()->ip);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* New motherboards sometimes make IRQ 13 be a PCI interrupt,
|
|
* so allow interrupt sharing.
|
|
*/
|
|
static struct irqaction fpu_irq = {
|
|
.handler = math_error_irq,
|
|
.mask = CPU_MASK_NONE,
|
|
.name = "fpu",
|
|
};
|
|
|
|
void __init init_ISA_irqs (void)
|
|
{
|
|
int i;
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
init_bsp_APIC();
|
|
#endif
|
|
init_8259A(0);
|
|
|
|
/*
|
|
* 16 old-style INTA-cycle interrupts:
|
|
*/
|
|
for (i = 0; i < 16; i++) {
|
|
set_irq_chip_and_handler_name(i, &i8259A_chip,
|
|
handle_level_irq, "XT");
|
|
}
|
|
}
|
|
|
|
/* Overridden in paravirt.c */
|
|
void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
|
|
|
|
void __init native_init_IRQ(void)
|
|
{
|
|
int i;
|
|
|
|
/* all the set up before the call gates are initialised */
|
|
pre_intr_init_hook();
|
|
|
|
/*
|
|
* 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 (i >= NR_IRQS)
|
|
break;
|
|
/* SYSCALL_VECTOR was reserved in trap_init. */
|
|
if (!test_bit(vector, used_vectors))
|
|
set_intr_gate(vector, interrupt[i]);
|
|
}
|
|
|
|
/* setup after call gates are initialised (usually add in
|
|
* the architecture specific gates)
|
|
*/
|
|
intr_init_hook();
|
|
|
|
/*
|
|
* External FPU? Set up irq13 if so, for
|
|
* original braindamaged IBM FERR coupling.
|
|
*/
|
|
if (boot_cpu_data.hard_math && !cpu_has_fpu)
|
|
setup_irq(FPU_IRQ, &fpu_irq);
|
|
|
|
irq_ctx_init(smp_processor_id());
|
|
}
|