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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1999 Ralf Baechle
 * Copyright (C) 1999 Silicon Graphics, Inc.
 */
#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>

        .text
        .set    noat
        .align  5
NESTED(ip27_irq, PT_SIZE, sp)
        SAVE_ALL
        CLI
        .set    at

        /* IP27 may signal interrupt which we're not interested in.
           Mask them out.  */
        mfc0    s0, CP0_CAUSE
        mfc0    t0, CP0_STATUS
        and     s0, t0

        /* First check for RT interrupt.  */
        andi    a0, s0, CAUSEF_IP4
        beqz    a0, 1f

        /* Ok, a timer interrupt. */
        move    a0, sp
        jal     rt_timer_interrupt

        j       ret_from_irq

1:      andi    a0, s0, (CAUSEF_IP2 | CAUSEF_IP3)
        beqz    a0, 1f

        /* ... a device interrupt ...  */
        move    a0, sp
        jal     ip27_do_irq

        j       ret_from_irq

1:
#if 1
        mfc0    a1, CP0_STATUS
        srl     a1, a1, 8
        andi    a1, 0xff

        mfc0    a2, CP0_CAUSE
        srl     a2, a2, 8
        andi    a2, 0xff

        move    a3, s0
        PRINT("Spurious interrupt, c0_status = %02x, c0_cause = %02x, pending %02x.\n")
        ld      a1, PT_EPC(sp)
0:      b       0b
#endif

        j       ret_from_irq
        END(ip27_irq)