1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/* $Id$
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1999 Ralf Baechle
* Copyright (C) 1999 Silicon Graphics, Inc.
*/
#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
.text
.set noat
.align 5
NESTED(ip27_irq, PT_SIZE, sp)
SAVE_ALL
CLI
.set at
/* IP27 may signal interrupt which we're not interested in.
Mask them out. */
mfc0 s0, CP0_CAUSE
mfc0 t0, CP0_STATUS
and s0, t0
/* First check for RT interrupt. */
andi a0, s0, CAUSEF_IP4
beqz a0, 1f
/* Ok, a timer interrupt. */
move a0, sp
jal rt_timer_interrupt
j ret_from_irq
1: andi a0, s0, (CAUSEF_IP2 | CAUSEF_IP3)
beqz a0, 1f
/* ... a device interrupt ... */
move a0, sp
jal ip27_do_irq
j ret_from_irq
1:
#if 1
mfc0 a1, CP0_STATUS
srl a1, a1, 8
andi a1, 0xff
mfc0 a2, CP0_CAUSE
srl a2, a2, 8
andi a2, 0xff
move a3, s0
PRINT("Spurious interrupt, c0_status = %02x, c0_cause = %02x, pending %02x.\n")
ld a1, PT_EPC(sp)
0: b 0b
#endif
j ret_from_irq
END(ip27_irq)
|
