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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* O(1) Priority Bitmap Scheduling Class
*/
#include <lume/sched.h>
#include <lume/sched_class.h>
#include <lume/task.h>
#include <lume/bitops.h>
#include <kernel/sched_internal.h>
static void o1_init_rq(RunQueue* rq)
{
rq->o1().init();
}
static void o1_enqueue_task(RunQueue* rq, TaskControlBlock* task)
{
rq->o1().enqueue(task);
rq->inc_running();
}
static void o1_dequeue_task(RunQueue* rq, TaskControlBlock* task)
{
rq->o1().dequeue(task);
rq->dec_running();
}
static TaskControlBlock* o1_pick_next_task(RunQueue* rq)
{
return rq->o1().pick_next();
}
static void o1_put_prev_task(RunQueue* /*rq*/, TaskControlBlock* /*task*/) {}
int32 priority_to_timeslice(uint8 priority)
{
int32 ts = 20 - static_cast<int32>(priority) * 19 / 31;
if (ts < 1) ts = 1;
return ts;
}
static void o1_task_tick(RunQueue* rq, TaskControlBlock* curr)
{
if (curr == rq->idle()) {
/* Idle task: if anything is runnable, yield immediately */
if (rq->nr_running() > 0) {
rq->set_need_resched(true);
}
return;
}
curr->time_slice--;
if (curr->time_slice <= 0) {
curr->time_slice = priority_to_timeslice(curr->priority);
rq->set_need_resched(true);
}
}
static void o1_yield_task(RunQueue* rq, TaskControlBlock* curr)
{
if (curr == rq->idle())
return;
curr->time_slice = 0;
rq->set_need_resched(true);
}
const SchedClass g_sched_class_o1 = {
.name = "o1",
.next = &g_sched_class_idle,
.init_rq = o1_init_rq,
.enqueue_task = o1_enqueue_task,
.dequeue_task = o1_dequeue_task,
.pick_next_task = o1_pick_next_task,
.put_prev_task = o1_put_prev_task,
.task_tick = o1_task_tick,
.yield_task = o1_yield_task,
};
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