1/*	$NetBSD: irq_dispatch.S,v 1.10 2008/04/27 18:58:44 matt Exp $	*/
2
3/*
4 * Copyright (c) 2002 Fujitsu Component Limited
5 * Copyright (c) 2002 Genetec Corporation
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The Fujitsu Component Limited nor the name of
17 *    Genetec corporation may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC
21 * CORPORATION ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
22 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED.  IN NO EVENT SHALL FUJITSU COMPONENT LIMITED OR GENETEC
25 * CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
29 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35/*
36 * Copyright (c) 2002, 2003 Wasabi Systems, Inc.
37 * All rights reserved.
38 *
39 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 *    notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 *    notice, this list of conditions and the following disclaimer in the
48 *    documentation and/or other materials provided with the distribution.
49 * 3. All advertising materials mentioning features or use of this software
50 *    must display the following acknowledgement:
51 *	This product includes software developed for the NetBSD Project by
52 *	Wasabi Systems, Inc.
53 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
54 *    or promote products derived from this software without specific prior
55 *    written permission.
56 *
57 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
59 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
60 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
61 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
62 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
63 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
64 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
65 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
66 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
67 * POSSIBILITY OF SUCH DAMAGE.
68 */
69
70#include "assym.h"
71
72#include <machine/asm.h>
73#include <machine/cpu.h>
74#include <machine/frame.h>
75
76#include "opt_arm_intr_impl.h"
77#ifdef ARM_INTR_IMPL
78#include ARM_INTR_IMPL
79#else
80#error ARM_INTR_IMPL not defined
81#endif
82
83#ifndef ARM_IRQ_HANDLER
84#error ARM_IRQ_HANDLER not defined
85#endif
86
87/*
88 * irq_entry:
89 *	Main entry point for the IRQ vector.  This is a generic version
90 *	which can be used by different platforms.
91 */
92	.text
93	.align	0
94
95LOCK_CAS_CHECK_LOCALS
96
97AST_ALIGNMENT_FAULT_LOCALS
98
99ASENTRY_NP(irq_entry)
100	sub	lr, lr, #0x00000004	/* Adjust the lr */
101
102	PUSHFRAMEINSVC			/* Push an interrupt frame */
103	ENABLE_ALIGNMENT_FAULTS		/* finishes with curcpu() in r4 */
104
105	/*
106	 * Increment the interrupt nesting depth and call the interrupt
107	 * dispatch routine.  We've pushed a frame, so we can safely use
108	 * callee-saved regs here.  We use the following registers, which
109	 * we expect to persist:
110	 *
111	 *	r4	address of current cpu_info
112	 *	r6	old value of `ci_intr_depth'
113	 */
114	mov	r0, sp			/* arg for dispatcher */
115	ldr	r6, [r4, #CI_INTR_DEPTH]
116	add	r1, r6, #1
117	str	r1, [r4, #CI_INTR_DEPTH]
118
119	bl	ARM_IRQ_HANDLER
120
121	/*
122	 * Restore the old interrupt depth value (which should be the
123	 * same as decrementing it at this point).
124	 */
125	str	r6, [r4, #CI_INTR_DEPTH]
126
127	LOCK_CAS_CHECK
128
129	DO_AST_AND_RESTORE_ALIGNMENT_FAULTS
130	PULLFRAMEFROMSVCANDEXIT
131	movs	pc, lr			/* Exit */
132