root / hw / irq.c @ 7bc3018b
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1 | d537cf6c | pbrook | /*
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2 | d537cf6c | pbrook | * QEMU IRQ/GPIO common code.
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3 | 5fafdf24 | ths | *
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4 | d537cf6c | pbrook | * Copyright (c) 2007 CodeSourcery.
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5 | 5fafdf24 | ths | *
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6 | d537cf6c | pbrook | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | d537cf6c | pbrook | * of this software and associated documentation files (the "Software"), to deal
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8 | d537cf6c | pbrook | * in the Software without restriction, including without limitation the rights
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9 | d537cf6c | pbrook | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | d537cf6c | pbrook | * copies of the Software, and to permit persons to whom the Software is
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11 | d537cf6c | pbrook | * furnished to do so, subject to the following conditions:
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12 | d537cf6c | pbrook | *
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13 | d537cf6c | pbrook | * The above copyright notice and this permission notice shall be included in
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14 | d537cf6c | pbrook | * all copies or substantial portions of the Software.
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15 | d537cf6c | pbrook | *
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16 | d537cf6c | pbrook | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | d537cf6c | pbrook | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | d537cf6c | pbrook | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | d537cf6c | pbrook | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | d537cf6c | pbrook | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | d537cf6c | pbrook | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | d537cf6c | pbrook | * THE SOFTWARE.
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23 | d537cf6c | pbrook | */
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24 | 87ecb68b | pbrook | #include "qemu-common.h" |
25 | 87ecb68b | pbrook | #include "irq.h" |
26 | d537cf6c | pbrook | |
27 | d537cf6c | pbrook | struct IRQState {
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28 | d537cf6c | pbrook | qemu_irq_handler handler; |
29 | d537cf6c | pbrook | void *opaque;
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30 | d537cf6c | pbrook | int n;
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31 | d537cf6c | pbrook | }; |
32 | d537cf6c | pbrook | |
33 | d537cf6c | pbrook | void qemu_set_irq(qemu_irq irq, int level) |
34 | d537cf6c | pbrook | { |
35 | d537cf6c | pbrook | if (!irq)
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36 | d537cf6c | pbrook | return;
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37 | d537cf6c | pbrook | |
38 | d537cf6c | pbrook | irq->handler(irq->opaque, irq->n, level); |
39 | d537cf6c | pbrook | } |
40 | d537cf6c | pbrook | |
41 | d537cf6c | pbrook | qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n) |
42 | d537cf6c | pbrook | { |
43 | d537cf6c | pbrook | qemu_irq *s; |
44 | d537cf6c | pbrook | struct IRQState *p;
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45 | d537cf6c | pbrook | int i;
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46 | d537cf6c | pbrook | |
47 | 7267c094 | Anthony Liguori | s = (qemu_irq *)g_malloc0(sizeof(qemu_irq) * n);
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48 | 7267c094 | Anthony Liguori | p = (struct IRQState *)g_malloc0(sizeof(struct IRQState) * n); |
49 | d537cf6c | pbrook | for (i = 0; i < n; i++) { |
50 | d537cf6c | pbrook | p->handler = handler; |
51 | d537cf6c | pbrook | p->opaque = opaque; |
52 | d537cf6c | pbrook | p->n = i; |
53 | d537cf6c | pbrook | s[i] = p; |
54 | d537cf6c | pbrook | p++; |
55 | d537cf6c | pbrook | } |
56 | d537cf6c | pbrook | return s;
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57 | d537cf6c | pbrook | } |
58 | d537cf6c | pbrook | |
59 | 51bf9e7e | aliguori | void qemu_free_irqs(qemu_irq *s)
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60 | 51bf9e7e | aliguori | { |
61 | 7267c094 | Anthony Liguori | g_free(s[0]);
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62 | 7267c094 | Anthony Liguori | g_free(s); |
63 | 51bf9e7e | aliguori | } |
64 | 51bf9e7e | aliguori | |
65 | b50a6563 | balrog | static void qemu_notirq(void *opaque, int line, int level) |
66 | b50a6563 | balrog | { |
67 | b50a6563 | balrog | struct IRQState *irq = opaque;
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68 | b50a6563 | balrog | |
69 | b50a6563 | balrog | irq->handler(irq->opaque, irq->n, !level); |
70 | b50a6563 | balrog | } |
71 | b50a6563 | balrog | |
72 | b50a6563 | balrog | qemu_irq qemu_irq_invert(qemu_irq irq) |
73 | b50a6563 | balrog | { |
74 | cf0dbb21 | pbrook | /* The default state for IRQs is low, so raise the output now. */
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75 | cf0dbb21 | pbrook | qemu_irq_raise(irq); |
76 | b50a6563 | balrog | return qemu_allocate_irqs(qemu_notirq, irq, 1)[0]; |
77 | b50a6563 | balrog | } |
78 | 9793212b | Peter Maydell | |
79 | 9793212b | Peter Maydell | static void qemu_splitirq(void *opaque, int line, int level) |
80 | 9793212b | Peter Maydell | { |
81 | 9793212b | Peter Maydell | struct IRQState **irq = opaque;
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82 | 9793212b | Peter Maydell | irq[0]->handler(irq[0]->opaque, irq[0]->n, level); |
83 | 9793212b | Peter Maydell | irq[1]->handler(irq[1]->opaque, irq[1]->n, level); |
84 | 9793212b | Peter Maydell | } |
85 | 9793212b | Peter Maydell | |
86 | 9793212b | Peter Maydell | qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2) |
87 | 9793212b | Peter Maydell | { |
88 | 7267c094 | Anthony Liguori | qemu_irq *s = g_malloc0(2 * sizeof(qemu_irq)); |
89 | 9793212b | Peter Maydell | s[0] = irq1;
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90 | 9793212b | Peter Maydell | s[1] = irq2;
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91 | 9793212b | Peter Maydell | return qemu_allocate_irqs(qemu_splitirq, s, 1)[0]; |
92 | 9793212b | Peter Maydell | } |
93 | 22ec3283 | Avi Kivity | |
94 | 22ec3283 | Avi Kivity | static void proxy_irq_handler(void *opaque, int n, int level) |
95 | 22ec3283 | Avi Kivity | { |
96 | 22ec3283 | Avi Kivity | qemu_irq **target = opaque; |
97 | 22ec3283 | Avi Kivity | |
98 | 22ec3283 | Avi Kivity | if (*target) {
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99 | 22ec3283 | Avi Kivity | qemu_set_irq((*target)[n], level); |
100 | 22ec3283 | Avi Kivity | } |
101 | 22ec3283 | Avi Kivity | } |
102 | 22ec3283 | Avi Kivity | |
103 | 22ec3283 | Avi Kivity | qemu_irq *qemu_irq_proxy(qemu_irq **target, int n)
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104 | 22ec3283 | Avi Kivity | { |
105 | 22ec3283 | Avi Kivity | return qemu_allocate_irqs(proxy_irq_handler, target, n);
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106 | 22ec3283 | Avi Kivity | } |
107 | 20288345 | Paolo Bonzini | |
108 | 20288345 | Paolo Bonzini | void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n) |
109 | 20288345 | Paolo Bonzini | { |
110 | 20288345 | Paolo Bonzini | int i;
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111 | 20288345 | Paolo Bonzini | qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n); |
112 | 20288345 | Paolo Bonzini | for (i = 0; i < n; i++) { |
113 | 20288345 | Paolo Bonzini | *old_irqs[i] = *gpio_in[i]; |
114 | 20288345 | Paolo Bonzini | gpio_in[i]->handler = handler; |
115 | 20288345 | Paolo Bonzini | gpio_in[i]->opaque = old_irqs; |
116 | 20288345 | Paolo Bonzini | } |
117 | 20288345 | Paolo Bonzini | } |
118 | 20288345 | Paolo Bonzini | |
119 | 20288345 | Paolo Bonzini | void qemu_irq_intercept_out(qemu_irq **gpio_out, qemu_irq_handler handler, int n) |
120 | 20288345 | Paolo Bonzini | { |
121 | 20288345 | Paolo Bonzini | qemu_irq *old_irqs = *gpio_out; |
122 | 20288345 | Paolo Bonzini | *gpio_out = qemu_allocate_irqs(handler, old_irqs, n); |
123 | 20288345 | Paolo Bonzini | } |