70 lines
1.7 KiB
ArmAsm
70 lines
1.7 KiB
ArmAsm
|
/*
|
||
|
|
* Carsten Langgaard, carstenl@mips.com
|
||
|
|
* Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved.
|
||
|
|
*
|
||
|
|
* This program is free software; you can distribute it and/or modify it
|
||
|
|
* under the terms of the GNU General Public License (Version 2) as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
||
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
|
|
* for more details.
|
||
|
|
*
|
||
|
|
* 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.,
|
||
|
|
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
|
||
|
|
*
|
||
|
|
* Interrupt exception dispatch code.
|
||
|
|
*/
|
||
|
|
#include <asm/asm.h>
|
||
|
|
#include <asm/mipsregs.h>
|
||
|
|
#include <asm/regdef.h>
|
||
|
|
#include <asm/stackframe.h>
|
||
|
|
|
||
|
|
.text
|
||
|
|
.set noreorder
|
||
|
|
.align 5
|
||
|
|
NESTED(lasatIRQ, PT_SIZE, sp)
|
||
|
|
.set noat
|
||
|
|
SAVE_ALL
|
||
|
|
CLI
|
||
|
|
.set at
|
||
|
|
.set noreorder
|
||
|
|
|
||
|
|
mfc0 s0, CP0_CAUSE # get irq mask
|
||
|
|
|
||
|
|
/* First we check for r4k counter/timer IRQ. */
|
||
|
|
andi a0, s0, CAUSEF_IP7
|
||
|
|
beq a0, zero, 1f
|
||
|
|
andi a0, s0, CAUSEF_IP2 # delay slot, check hw0 interrupt
|
||
|
|
|
||
|
|
/* Wheee, a timer interrupt. */
|
||
|
|
li a0, 7
|
||
|
|
jal ll_timer_interrupt
|
||
|
|
move a1, sp
|
||
|
|
|
||
|
|
j ret_from_irq
|
||
|
|
nop
|
||
|
|
|
||
|
|
1:
|
||
|
|
/* Wheee, combined hardware level zero interrupt. */
|
||
|
|
jal lasat_hw0_irqdispatch
|
||
|
|
move a0, sp # delay slot
|
||
|
|
|
||
|
|
j ret_from_irq
|
||
|
|
nop # delay slot
|
||
|
|
|
||
|
|
1:
|
||
|
|
/*
|
||
|
|
* Here by mistake? This is possible, what can happen is that by the
|
||
|
|
* time we take the exception the IRQ pin goes low, so just leave if
|
||
|
|
* this is the case.
|
||
|
|
*/
|
||
|
|
move a1,s0
|
||
|
|
mfc0 a1, CP0_EPC
|
||
|
|
|
||
|
|
j ret_from_irq
|
||
|
|
nop
|
||
|
|
END(lasatIRQ)
|