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q-irq.c

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/linkage.h>

#include <asm/i8259.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <asm/qemu.h>
#include <asm/system.h>
#include <asm/time.h>

asmlinkage void plat_irq_dispatch(void)
{
      unsigned int pending = read_c0_status() & read_c0_cause();

      if (pending & 0x8000) {
            do_IRQ(Q_COUNT_COMPARE_IRQ);
            return;
      }
      if (pending & 0x0400) {
            int irq = i8259_irq();

            if (likely(irq >= 0))
                  do_IRQ(irq);

            return;
      }
}

void __init arch_init_irq(void)
{
      mips_hpt_frequency = QEMU_C0_COUNTER_CLOCK;           /* 100MHz */

      mips_cpu_irq_init();
      init_i8259_irqs();
      set_c0_status(0x400);
}

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