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70 lines
1.7 KiB
70 lines
1.7 KiB
20 years ago
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/*
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Interrupt exception dispatch code.
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*/
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#include <asm/asm.h>
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#include <asm/mipsregs.h>
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#include <asm/regdef.h>
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#include <asm/stackframe.h>
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.text
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.set noreorder
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.align 5
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NESTED(lasatIRQ, PT_SIZE, sp)
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.set noat
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SAVE_ALL
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CLI
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.set at
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.set noreorder
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mfc0 s0, CP0_CAUSE # get irq mask
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/* First we check for r4k counter/timer IRQ. */
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andi a0, s0, CAUSEF_IP7
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beq a0, zero, 1f
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andi a0, s0, CAUSEF_IP2 # delay slot, check hw0 interrupt
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/* Wheee, a timer interrupt. */
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li a0, 7
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jal ll_timer_interrupt
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move a1, sp
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j ret_from_irq
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nop
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1:
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/* Wheee, combined hardware level zero interrupt. */
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jal lasat_hw0_irqdispatch
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move a0, sp # delay slot
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j ret_from_irq
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nop # delay slot
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1:
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/*
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* Here by mistake? This is possible, what can happen is that by the
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* time we take the exception the IRQ pin goes low, so just leave if
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* this is the case.
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*/
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move a1,s0
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mfc0 a1, CP0_EPC
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j ret_from_irq
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nop
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END(lasatIRQ)
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