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#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>

        .text
        .set    macro
        .set    noat
        .align  5

NESTED(it8172_IRQ, PT_SIZE, sp)
        SAVE_ALL
        CLI                             # Important: mark KERNEL mode !

        /* We're working with 'reorder' set at this point. */
        /*
         * Get pending interrupts
         */

        mfc0    t0,CP0_CAUSE            # get pending interrupts
        mfc0    t1,CP0_STATUS           # get enabled interrupts
        and     t0,t1                   # isolate allowed ones

        andi    t0,0xff00               # isolate pending bits
        beqz    t0, 3f                  # spurious interrupt

        andi    a0, t0, CAUSEF_IP7
        beq     a0, zero, 1f

        li      a0, 127                 # MIPS_CPU_TIMER_IRQ = (NR_IRQS-1)
        move    a1, sp
        jal     ll_timer_interrupt
        j       ret_from_irq
        nop

1:
        andi    a0, t0, CAUSEF_IP2      # the only int we expect at this time
        beq     a0, zero, 3f
        move    a0,sp
        jal     it8172_hw0_irqdispatch

        mfc0    t0,CP0_STATUS           # disable interrupts
        ori     t0,1
        xori    t0,1
        mtc0    t0,CP0_STATUS
        nop
        nop
        nop

        la      a1, ret_from_irq
        jr      a1
        nop

3:
        move a0, sp
        jal     mips_spurious_interrupt
        nop
        la      a1, ret_from_irq
        jr      a1
        nop

END(it8172_IRQ)