1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/sched.h>
#include <sys/schedvar.h>
#include <sys/cdefs.h>
#include <sys/syslog.h>
#include <machine/frame.h>
#include <dev/timer.h>
#include <assert.h>
#define pr_trace(fmt, ...) kprintf("ksched: " fmt, ##__VA_ARGS__)
void sched_switch(struct trapframe *tf);
static sched_policy_t policy = SCHED_POLICY_RR;
/*
* Thread ready queues - all threads ready to be
* scheduled should be added to the toplevel queue.
*/
static struct sched_queue qlist[SCHED_NQUEUE];
/*
* Perform timer oneshot
*/
static inline void
sched_oneshot(bool now)
{
struct timer timer;
size_t usec = now ? SHORT_TIMESLICE_USEC : DEFAULT_TIMESLICE_USEC;
tmrr_status_t tmr_status;
tmr_status = req_timer(TIMER_SCHED, &timer);
__assert(tmr_status == TMRR_SUCCESS);
timer.oneshot_us(usec);
}
/*
* Perform a context switch.
*
* TODO
*/
void
sched_switch(struct trapframe *tf)
{
static struct spinlock lock = {0};
spinlock_acquire(&lock);
spinlock_release(&lock);
sched_oneshot(false);
}
/*
* Main scheduler loop
*/
void
sched_enter(void)
{
sched_oneshot(false);
for (;;);
}
void
sched_init(void)
{
/* Setup the queues */
for (int i = 0; i < SCHED_NQUEUE; ++i) {
TAILQ_INIT(&qlist[i].q);
}
pr_trace("Prepared %d queues (policy=0x%x)\n",
SCHED_NQUEUE, policy);
}
|
