Subversion Repositories or1k

/*
 * FILE NAME
 *      arch/mips/vr41xx/common/int-handler.S
 *
 * BRIEF MODULE DESCRIPTION
 *      Interrupt dispatcher for the NEC VR4100 series.
 *
 * Author: Yoichi Yuasa
 *         yyuasa@mvista.com or source@mvista.com
 *
 * Copyright 2001 MontaVista Software Inc.
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */
/*
 * Changes:
 *  MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
 *  - New creation, NEC VR4100 series are supported.
 *
 *  Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
 *  - Coped with INTASSIGN of NEC VR4133.
 */
#include <asm/asm.h>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/stackframe.h>

                .text
                .set    noreorder

                .align  5
                NESTED(vr41xx_handle_interrupt, PT_SIZE, ra)
                .set    noat
                SAVE_ALL
                CLI
                .set    at
                .set    noreorder

                /*
                 * Get the pending interrupts
                 */
                mfc0    t0, CP0_CAUSE
                mfc0    t1, CP0_STATUS
                andi    t0, 0xff00
                and     t0, t0, t1

                andi    t1, t0, CAUSEF_IP7      # MIPS timer interrupt
                bnez    t1, handle_irq
                li      a0, 7

                andi    t1, t0, 0x7800          # check for Int1-4
                beqz    t1, 1f

                andi    t1, t0, CAUSEF_IP3      # check for Int1
                bnez    t1, handle_int
                li      a0, 1

                andi    t1, t0, CAUSEF_IP4      # check for Int2
                bnez    t1, handle_int
                li      a0, 2

                andi    t1, t0, CAUSEF_IP5      # check for Int3
                bnez    t1, handle_int
                li      a0, 3

                andi    t1, t0, CAUSEF_IP6      # check for Int4
                bnez    t1, handle_int
                li      a0, 4

1:
                andi    t1, t0, CAUSEF_IP2      # check for Int0
                bnez    t1, handle_int
                li      a0, 0

                andi    t1, t0, CAUSEF_IP0      # check for IP0
                bnez    t1, handle_irq
                li      a0, 0

                andi    t1, t0, CAUSEF_IP1      # check for IP1
                bnez    t1, handle_irq
                li      a0, 1

                j       spurious_interrupt
                nop

handle_int:
                jal     irq_dispatch
                move    a1, sp
                j       ret_from_irq
                nop

handle_irq:
                jal     do_IRQ
                move    a1, sp
                j       ret_from_irq
                END(vr41xx_handle_interrupt)