1 /* $NetBSD: sa11x0_irq.S,v 1.5 2003/03/31 19:52:35 chris Exp $ */
2
3 /*-
4 * Copyright (c) 1998 Mark Brinicombe.
5 * Copyright (c) 1998 Causality Limited
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to the NetBSD Foundation
9 * by IWAMOTO Toshihiro.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by Mark Brinicombe
22 * for the NetBSD Project.
23 * 4. The name of the company nor the name of the author may be used to
24 * endorse or promote products derived from this software without specific
25 * prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
28 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
29 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
30 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
31 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
32 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
33 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 */
40
41 #include "assym.s"
42 #include <machine/asm.h>
43 #include <machine/armreg.h>
44 #include <machine/asmacros.h>
45 #include <arm/sa11x0/sa11x0_reg.h>
46 __FBSDID("$FreeBSD: src/sys/arm/sa11x0/sa11x0_irq.S,v 1.3 2005/01/05 21:58:48 imp Exp $");
47 Lcurrent_intr_depth:
48 .word _C_LABEL(current_intr_depth)
49
50 .globl _C_LABEL(saipic_base)
51 _C_LABEL(saipic_base):
52 .word 0x00000000
53
54 #ifdef INTR_DEBUG
55 Ldbg_str:
56 .asciz "irq_entry %x %x\n"
57 #endif
58
59 AST_LOCALS
60 /*
61 * Regsister usage
62 *
63 * r6 - Address of current handler
64 * r7 - Pointer to handler pointer list
65 * r8 - Current IRQ requests.
66 * r9 - Used to count through possible IRQ bits.
67 * r10 - Base address of SAIP
68 */
69
70 ASENTRY_NP(irq_entry)
71 sub lr, lr, #0x00000004 /* Adjust the lr */
72
73 PUSHFRAMEINSVC /* Push an interrupt frame */
74
75 /* Load r8 with the SAIPIC interrupt requests */
76
77 ldr r10, _C_LABEL(saipic_base)
78 ldr r8, [r10, #(SAIPIC_IP)] /* Load IRQ pending register */
79
80 #ifdef INTR_DEBUG
81 ldr r2, [r10, #(SAIPIC_MR)]
82 adr r0, Ldbg_str
83 mov r1, r8
84 bl _C_LABEL(printf)
85 #endif
86 /*
87 * Note that we have entered the IRQ handler.
88 * We are in SVC mode so we cannot use the processor mode
89 * to determine if we are in an IRQ. Instead we will count the
90 * each time the interrupt handler is nested.
91 */
92
93 ldr r0, Lcurrent_intr_depth
94 ldr r1, [r0]
95 add r1, r1, #1
96 str r1, [r0]
97
98 mov r0, sp
99 mov r1, r8
100 bl _C_LABEL(arm_handler_execute)
101
102 #ifdef INTR_DEBUG
103 adr r0, Ldbg_str
104 mov r1, #3
105 ldr r2, [r10, #(SAIPIC_MR)]
106 bl _C_LABEL(printf)
107 #endif
108
109 /* Decrement the nest count */
110 ldr r0, Lcurrent_intr_depth
111 ldr r1, [r0]
112 sub r1, r1, #1
113 str r1, [r0]
114
115 DO_AST
116 PULLFRAMEFROMSVCANDEXIT
117
118 /* NOT REACHED */
119 b . - 8
120 Lcnt:
121 .word _C_LABEL(cnt)
122
123 ENTRY(sa11x0_activateirqs)
124 ldr r0, _C_LABEL(saipic_base)
125 mov r1, #0xffffffff
126 str r1, [r0, #(SAIPIC_MR)]
127 mov pc, lr
128 #ifdef IRQSTATS
129 Lintrcnt:
130 .word _C_LABEL(intrcnt)
131 #endif
132
133 .global _C_LABEL(intrnames), _C_LABEL(eintrnames)
134 .global _C_LABEL(eintrcnt)
135 _C_LABEL(intrnames):
136 _C_LABEL(eintrnames):
137 _C_LABEL(eintrcnt):
138
139 .globl _C_LABEL(intrcnt), _C_LABEL(sintrcnt)
140
141 _C_LABEL(intrcnt):
142 .space ICU_LEN*4 /* XXX Should be linked to number of interrupts */
143
144 _C_LABEL(sintrcnt):
145 .space 32*4
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