summaryrefslogtreecommitdiffstats
path: root/sys/arm/sa11x0/sa11x0_irq.S
blob: 8f85012c595e96dc94e5718c19c3fec5f183a213 (plain)
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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*	$NetBSD: sa11x0_irq.S,v 1.5 2003/03/31 19:52:35 chris Exp $	*/

/*
 * Copyright (c) 1998 Mark Brinicombe.
 * Copyright (c) 1998 Causality Limited
 * All rights reserved.
 *
 * This code is derived from software contributed to the NetBSD Foundation
 * by IWAMOTO Toshihiro.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Mark Brinicombe
 *      for the NetBSD Project.
 * 4. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include "assym.s"
#include <machine/asm.h>
#include <machine/armreg.h>
#include <machine/asmacros.h>
#include <arm/sa11x0/sa11x0_reg.h>
__FBSDID("$FreeBSD$");
Lcurrent_intr_depth:
	.word	_C_LABEL(current_intr_depth)

	.globl	_C_LABEL(saipic_base)
_C_LABEL(saipic_base):
	.word	0x00000000

#ifdef INTR_DEBUG
Ldbg_str:
	.asciz	"irq_entry %x %x\n"
#endif

AST_LOCALS
/*
 * Regsister usage
 *
 *  r6  - Address of current handler
 *  r7  - Pointer to handler pointer list
 *  r8  - Current IRQ requests.
 *  r9  - Used to count through possible IRQ bits.
 *  r10 - Base address of SAIP
 */

ASENTRY_NP(irq_entry)
	sub	lr, lr, #0x00000004	/* Adjust the lr */

	PUSHFRAMEINSVC			/* Push an interrupt frame */

	/* Load r8 with the SAIPIC interrupt requests */

	ldr	r10, _C_LABEL(saipic_base)
	ldr	r8, [r10, #(SAIPIC_IP)]	/* Load IRQ pending register */

#ifdef INTR_DEBUG
	ldr	r2, [r10, #(SAIPIC_MR)]
	adr	r0, Ldbg_str
	mov	r1, r8
	bl	_C_LABEL(printf)
#endif
	/*
	 * Note that we have entered the IRQ handler.
	 * We are in SVC mode so we cannot use the processor mode
	 * to determine if we are in an IRQ. Instead we will count the
	 * each time the interrupt handler is nested.
	 */

	ldr	r0, Lcurrent_intr_depth
	ldr	r1, [r0]
	add	r1, r1, #1
	str	r1, [r0]

	mov	r0, sp
	mov	r1, r8
	bl	_C_LABEL(arm_handler_execute)

#ifdef INTR_DEBUG
	adr	r0, Ldbg_str
	mov	r1, #3
	ldr	r2, [r10, #(SAIPIC_MR)]
	bl	_C_LABEL(printf)
#endif

	/* Decrement the nest count */
	ldr	r0, Lcurrent_intr_depth
	ldr	r1, [r0]
	sub	r1, r1, #1
	str	r1, [r0]

	DO_AST
	PULLFRAMEFROMSVCANDEXIT

	/* NOT REACHED */
	b	. - 8
Lcnt:
	.word	_C_LABEL(cnt)

ENTRY(sa11x0_activateirqs)
	ldr	r0, _C_LABEL(saipic_base)
	mov	r1, #0xffffffff
	str	r1, [r0, #(SAIPIC_MR)]
	mov	pc, lr
#ifdef IRQSTATS
Lintrcnt:
	.word	_C_LABEL(intrcnt)
#endif

	.global _C_LABEL(intrnames), _C_LABEL(eintrnames)
	.global _C_LABEL(eintrcnt)
_C_LABEL(intrnames): 
_C_LABEL(eintrnames):
_C_LABEL(eintrcnt):

	.globl	_C_LABEL(intrcnt), _C_LABEL(sintrcnt)

_C_LABEL(intrcnt):
	.space	ICU_LEN*4  /* XXX Should be linked to number of interrupts */

_C_LABEL(sintrcnt):
	.space 32*4
OpenPOWER on IntegriCloud