tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved.
4 *
5 * This program is free software; you can distribute it and/or modify it
6 * under the terms of the GNU General Public License (Version 2) as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
17 *
18 * Interrupt exception dispatch code.
19 */
20#include <asm/asm.h>
21#include <asm/mipsregs.h>
22#include <asm/regdef.h>
23#include <asm/stackframe.h>
24
25 .text
26 .set noreorder
27 .align 5
28 NESTED(lasatIRQ, PT_SIZE, sp)
29 .set noat
30 SAVE_ALL
31 CLI
32 .set at
33 .set noreorder
34
35 mfc0 s0, CP0_CAUSE # get irq mask
36
37 /* First we check for r4k counter/timer IRQ. */
38 andi a0, s0, CAUSEF_IP7
39 beq a0, zero, 1f
40 andi a0, s0, CAUSEF_IP2 # delay slot, check hw0 interrupt
41
42 /* Wheee, a timer interrupt. */
43 li a0, 7
44 jal ll_timer_interrupt
45 move a1, sp
46
47 j ret_from_irq
48 nop
49
501:
51 /* Wheee, combined hardware level zero interrupt. */
52 jal lasat_hw0_irqdispatch
53 move a0, sp # delay slot
54
55 j ret_from_irq
56 nop # delay slot
57
581:
59 /*
60 * Here by mistake? This is possible, what can happen is that by the
61 * time we take the exception the IRQ pin goes low, so just leave if
62 * this is the case.
63 */
64 move a1,s0
65 mfc0 a1, CP0_EPC
66
67 j ret_from_irq
68 nop
69 END(lasatIRQ)