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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __ISR_H
#define __ISR_H
#include <stdbool.h>
#include <stdint.h>
#include <cpu.h>
#include <list.h>
#include <util.h>
#include <seos.h>
struct ChainedInterrupt {
link_t isrs;
void (*const enable)(struct ChainedInterrupt *);
void (*const disable)(struct ChainedInterrupt *);
};
struct ChainedIsr {
link_t node;
uint32_t maxLatencyNs;
bool (*func)(struct ChainedIsr *);
uint16_t tid;
};
static inline void chainIsr(struct ChainedInterrupt *interrupt, struct ChainedIsr *isr)
{
interrupt->disable(interrupt);
list_add_tail(&interrupt->isrs, &isr->node);
interrupt->enable(interrupt);
}
static inline void unchainIsr(struct ChainedInterrupt *interrupt, struct ChainedIsr *isr)
{
interrupt->disable(interrupt);
isr->tid = 0;
list_delete(&isr->node);
if (!list_is_empty(&interrupt->isrs))
interrupt->enable(interrupt);
}
static inline bool dispatchIsr(struct ChainedInterrupt *interrupt)
{
struct link_t *cur, *tmp;
bool handled = false;
uint16_t oldTid = osGetCurrentTid();
list_iterate(&interrupt->isrs, cur, tmp) {
struct ChainedIsr *curIsr = container_of(cur, struct ChainedIsr, node);
osSetCurrentTid(curIsr->tid);
handled = curIsr->func(curIsr);
if (handled)
break;
}
osSetCurrentTid(oldTid);
return handled;
}
static inline int unchainIsrAll(struct ChainedInterrupt *interrupt, uint32_t tid)
{
int count = 0;
struct link_t *cur, *tmp;
list_iterate(&interrupt->isrs, cur, tmp) {
struct ChainedIsr *curIsr = container_of(cur, struct ChainedIsr, node);
if (curIsr->tid == tid) {
unchainIsr(interrupt, curIsr);
count++;
}
}
return count;
}
static inline uint32_t maxLatencyIsr(struct ChainedInterrupt *interrupt)
{
struct link_t *cur, *tmp;
uint32_t latency = 0;
list_iterate(&interrupt->isrs, cur, tmp) {
struct ChainedIsr *curIsr = container_of(cur, struct ChainedIsr, node);
if (!latency || (curIsr->maxLatencyNs && curIsr->maxLatencyNs < latency))
latency = curIsr->maxLatencyNs;
}
return latency;
}
#endif /* __ISR_H */
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