arch/mips/qemu/q-irq.c

   1 #include <linux/init.h>
   2 #include <linux/linkage.h>
   3
   4 #include <asm/i8259.h>
   5 #include <asm/mipsregs.h>
   6 #include <asm/qemu.h>
   7 #include <asm/system.h>
   8 #include <asm/time.h>
   9
  10 extern asmlinkage void qemu_handle_int(void);
  11
  12 asmlinkage void do_qemu_int(struct pt_regs *regs)
  13 {
  14         unsigned int pending = read_c0_status() & read_c0_cause();
  15
  16         if (pending & 0x8000) {
  17                 ll_timer_interrupt(Q_COUNT_COMPARE_IRQ, regs);
  18                 return;
  19         }
  20         if (pending & 0x0400) {
  21                 int irq = i8259_irq();
  22
  23                 if (likely(irq >= 0))
  24                         do_IRQ(irq, regs);
  25
  26                 return;
  27         }
  28 }
  29
  30 void __init arch_init_irq(void)
  31 {
  32         set_except_vector(0, qemu_handle_int);
  33         mips_hpt_frequency = QEMU_C0_COUNTER_CLOCK;             /* 100MHz */
  34
  35         init_i8259_irqs();
  36         set_c0_status(0x8400);
  37 }