2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved.
5 * ########################################################################
7 * This program is free software; you can distribute it and/or modify it
8 * under the terms of the GNU General Public License (Version 2) as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
20 * ########################################################################
22 * Interrupt exception dispatch code.
25 #include <linux/config.h>
28 #include <asm/mipsregs.h>
29 #include <asm/regdef.h>
30 #include <asm/stackframe.h>
36 NESTED(mipsIRQ, PT_SIZE, sp)
41 mfc0 s0, CP0_CAUSE # get irq mask
43 /* First we check for r4k counter/timer IRQ. */
44 andi a0, s0, CAUSEF_IP7
46 andi a0, s0, CAUSEF_IP2 # delay slot, check hw0 interrupt
48 /* Wheee, a timer interrupt. */
50 jal lasat_timer_interrupt
57 /* Wheee, combined hardware level zero interrupt. */
58 jal lasat_hw0_irqdispatch
59 move a0, sp # delay slot
66 * Here by mistake? This is possible, what can happen is that by the
67 * time we take the exception the IRQ pin goes low, so just leave if