asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs;
struct irq_desc *desc = irq_desc + irq;
unsigned short pending, other_ints;
old_regs = set_irq_regs(regs);
/*
* Some hardware gives randomly wrong interrupts. Rather
* than crashing, do something sensible.
*/
if (irq >= NR_IRQS)
desc = &bad_irq_desc;
irq_enter();
generic_handle_irq(irq);
/* If we're the only interrupt running (ignoring IRQ15 which is for
syscalls), lower our priority to IRQ14 so that softirqs run at
that level. If there's another, lower-level interrupt, irq_exit
will defer softirqs to that. */
CSYNC();
pending = bfin_read_IPEND() & ~0x8000;
other_ints = pending & (pending - 1);
if (other_ints == 0)
lower_to_irq14();
irq_exit();
set_irq_regs(old_regs);
}
asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs;
struct irq_desc *desc = irq_desc + irq;
#ifndef CONFIG_IPIPE
unsigned short pending, other_ints;
#endif
old_regs = set_irq_regs(regs);
/*
* Some hardware gives randomly wrong interrupts. Rather
* than crashing, do something sensible.
*/
if (irq >= NR_IRQS)
desc = &bad_irq_desc;
irq_enter();
#ifdef CONFIG_DEBUG_STACKOVERFLOW
/* Debugging check for stack overflow: is there less than STACK_WARN free? */
{
long sp;
sp = __get_SP() & (THREAD_SIZE-1);
if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
dump_stack();
printk(KERN_EMERG "%s: possible stack overflow while handling irq %i "
" only %ld bytes free\n",
__func__, irq, sp - sizeof(struct thread_info));
}
}
#endif
generic_handle_irq(irq);
#ifndef CONFIG_IPIPE
/*
* If we're the only interrupt running (ignoring IRQ15 which
* is for syscalls), lower our priority to IRQ14 so that
* softirqs run at that level. If there's another,
* lower-level interrupt, irq_exit will defer softirqs to
* that. If the interrupt pipeline is enabled, we are already
* running at IRQ14 priority, so we don't need this code.
*/
CSYNC();
pending = bfin_read_IPEND() & ~0x8000;
other_ints = pending & (pending - 1);
if (other_ints == 0)
lower_to_irq14();
#endif /* !CONFIG_IPIPE */
irq_exit();
set_irq_regs(old_regs);
}
static void maybe_lower_to_irq14(void)
{
unsigned short pending, other_ints;
/*
* If we're the only interrupt running (ignoring IRQ15 which
* is for syscalls), lower our priority to IRQ14 so that
* softirqs run at that level. If there's another,
* lower-level interrupt, irq_exit will defer softirqs to
* that. If the interrupt pipeline is enabled, we are already
* running at IRQ14 priority, so we don't need this code.
*/
CSYNC();
pending = bfin_read_IPEND() & ~0x8000;
other_ints = pending & (pending - 1);
if (other_ints == 0)
lower_to_irq14();
}
