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95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/*
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* Scheduler and runqueue API definitions.
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#ifndef __SCHEDULER_H__
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#define __SCHEDULER_H__
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#include <l4/generic/tcb.h>
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#include <l4/generic/smp.h>
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#include INC_SUBARCH(cpu.h)
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#include INC_SUBARCH(mm.h)
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#include INC_GLUE(memory.h)
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#include INC_GLUE(smp.h)
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/* Task priorities */
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#define TASK_PRIO_MAX 10
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#define TASK_PRIO_REALTIME 10
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#define TASK_PRIO_PAGER 8
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#define TASK_PRIO_SERVER 6
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#define TASK_PRIO_NORMAL 4
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#define TASK_PRIO_LOW 2
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#define TASK_PRIO_TOTAL 30
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/*
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* CONFIG_SCHED_TICKS gives ticks per second.
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* try ticks = 1000, and timeslice = 1 for regressed preemption test.
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*/
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/*
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* A task can run continuously at this granularity,
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* even if it has a greater total time slice.
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*/
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#define SCHED_GRANULARITY CONFIG_SCHED_TICKS/10
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static inline struct ktcb *current_task(void)
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{
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register u32 stack asm("sp");
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return (struct ktcb *)(stack & (~PAGE_MASK));
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}
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#define current current_task()
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#define need_resched (current->ts_need_resched)
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#define SCHED_RQ_TOTAL 4
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/* A basic runqueue */
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struct runqueue {
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struct scheduler *sched;
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struct spinlock lock; /* Lock */
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struct link task_list; /* List of tasks in rq */
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unsigned int total; /* Total tasks */
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};
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/*
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* Hints and flags to scheduler
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*/
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enum sched_flags {
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/* Schedule idle at a convenient time */
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SCHED_RUN_IDLE = (1 << 0),
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};
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/* Contains per-container scheduling structures */
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struct scheduler {
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unsigned int flags;
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unsigned int task_select_counter;
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struct runqueue sched_rq[SCHED_RQ_TOTAL];
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/* Regular runqueues */
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struct runqueue *rq_runnable;
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struct runqueue *rq_expired;
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struct ktcb *idle_task;
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/* Total priority of all tasks in container */
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int prio_total;
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};
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DECLARE_PERCPU(extern struct scheduler, scheduler);
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void sched_init_runqueue(struct scheduler *sched, struct runqueue *rq);
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void sched_init_task(struct ktcb *task, int priority);
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void sched_prepare_sleep(void);
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void sched_suspend_sync(void);
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void sched_suspend_async(void);
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void sched_resume_sync(struct ktcb *task);
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void sched_resume_async(struct ktcb *task);
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void sched_enqueue_task(struct ktcb *first_time_runner, int sync);
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void scheduler_start(void);
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void schedule(void);
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void sched_init(void);
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void idle_task(void);
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#endif /* __SCHEDULER_H__ */
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