1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef __ISR_H
18 #define __ISR_H
19
20 #include <stdbool.h>
21 #include <stdint.h>
22
23 #include <cpu.h>
24 #include <list.h>
25 #include <util.h>
26 #include <seos.h>
27
28 struct ChainedInterrupt {
29 link_t isrs;
30
31 void (*const enable)(struct ChainedInterrupt *);
32 void (*const disable)(struct ChainedInterrupt *);
33 };
34
35 struct ChainedIsr {
36 link_t node;
37 bool (*func)(struct ChainedIsr *);
38 uint16_t tid;
39 };
40
chainIsr(struct ChainedInterrupt * interrupt,struct ChainedIsr * isr)41 static inline void chainIsr(struct ChainedInterrupt *interrupt, struct ChainedIsr *isr)
42 {
43 interrupt->disable(interrupt);
44 list_add_tail(&interrupt->isrs, &isr->node);
45 interrupt->enable(interrupt);
46 }
47
unchainIsr(struct ChainedInterrupt * interrupt,struct ChainedIsr * isr)48 static inline void unchainIsr(struct ChainedInterrupt *interrupt, struct ChainedIsr *isr)
49 {
50 interrupt->disable(interrupt);
51 isr->tid = 0;
52 list_delete(&isr->node);
53 if (!list_is_empty(&interrupt->isrs))
54 interrupt->enable(interrupt);
55 }
56
dispatchIsr(struct ChainedInterrupt * interrupt)57 static inline bool dispatchIsr(struct ChainedInterrupt *interrupt)
58 {
59 struct link_t *cur, *tmp;
60 bool handled = false;
61 uint16_t oldTid = osGetCurrentTid();
62
63 list_iterate(&interrupt->isrs, cur, tmp) {
64 struct ChainedIsr *curIsr = container_of(cur, struct ChainedIsr, node);
65 osSetCurrentTid(curIsr->tid);
66 handled = curIsr->func(curIsr);
67 if (handled)
68 break;
69 }
70 osSetCurrentTid(oldTid);
71
72 return handled;
73 }
74
unchainIsrAll(struct ChainedInterrupt * interrupt,uint32_t tid)75 static inline int unchainIsrAll(struct ChainedInterrupt *interrupt, uint32_t tid)
76 {
77 int count = 0;
78 struct link_t *cur, *tmp;
79
80 list_iterate(&interrupt->isrs, cur, tmp) {
81 struct ChainedIsr *curIsr = container_of(cur, struct ChainedIsr, node);
82 if (curIsr->tid == tid) {
83 unchainIsr(interrupt, curIsr);
84 count++;
85 }
86 }
87
88 return count;
89 }
90
91 #endif /* __ISR_H */
92