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1 jermar 1
/*
2
 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
#include <proc/scheduler.h>
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#include <proc/thread.h>
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#include <proc/task.h>
32
#include <mm/heap.h>
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#include <mm/frame.h>
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#include <mm/page.h>
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#include <arch/asm.h>
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#include <arch.h>
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#include <synch/synch.h>
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#include <synch/spinlock.h>
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#include <synch/waitq.h>
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#include <synch/rwlock.h>
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#include <cpu.h>
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#include <func.h>
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#include <context.h>
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#include <list.h>
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#include <typedefs.h>
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#include <time/clock.h>
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#include <list.h>
7 jermar 48
#include <config.h>
49
#include <arch/interrupt.h>
10 jermar 50
#include <smp/ipi.h>
76 jermar 51
#include <arch/faddr.h>
111 palkovsky 52
#include <arch/atomic.h>
195 vana 53
#include <memstr.h>
777 palkovsky 54
#include <print.h>
7 jermar 55
 
107 decky 56
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
1 jermar 57
 
623 jermar 58
SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
624 jermar 59
LIST_INITIALIZE(threads_head);      /**< List of all threads. */
1 jermar 60
 
623 jermar 61
SPINLOCK_INITIALIZE(tidlock);
1 jermar 62
__u32 last_tid = 0;
63
 
107 decky 64
 
65
/** Thread wrapper
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 *
67
 * This wrapper is provided to ensure that every thread
1 jermar 68
 * makes a call to thread_exit() when its implementing
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 * function returns.
70
 *
413 jermar 71
 * interrupts_disable() is assumed.
107 decky 72
 *
1 jermar 73
 */
452 decky 74
static void cushion(void)
1 jermar 75
{
15 jermar 76
    void (*f)(void *) = THREAD->thread_code;
77
    void *arg = THREAD->thread_arg;
1 jermar 78
 
213 jermar 79
    /* this is where each thread wakes up after its creation */
22 jermar 80
    before_thread_runs();
81
 
15 jermar 82
    spinlock_unlock(&THREAD->lock);
413 jermar 83
    interrupts_enable();
1 jermar 84
 
85
    f(arg);
86
    thread_exit();
87
    /* not reached */
88
}
89
 
107 decky 90
 
91
/** Initialize threads
92
 *
93
 * Initialize kernel threads support.
94
 *
95
 */
1 jermar 96
void thread_init(void)
97
{
15 jermar 98
    THREAD = NULL;
625 palkovsky 99
    atomic_set(&nrdy,0);
1 jermar 100
}
101
 
107 decky 102
 
103
/** Make thread ready
104
 *
105
 * Switch thread t to the ready state.
106
 *
107
 * @param t Thread to make ready.
108
 *
109
 */
1 jermar 110
void thread_ready(thread_t *t)
111
{
112
    cpu_t *cpu;
113
    runq_t *r;
413 jermar 114
    ipl_t ipl;
625 palkovsky 115
    int i, avg;
1 jermar 116
 
413 jermar 117
    ipl = interrupts_disable();
1 jermar 118
 
119
    spinlock_lock(&t->lock);
120
 
413 jermar 121
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
1 jermar 122
 
16 jermar 123
    cpu = CPU;
1 jermar 124
    if (t->flags & X_WIRED) {
125
        cpu = t->cpu;
126
    }
127
    spinlock_unlock(&t->lock);
128
 
107 decky 129
    /*
1 jermar 130
     * Append t to respective ready queue on respective processor.
131
     */
132
    r = &cpu->rq[i];
133
    spinlock_lock(&r->lock);
134
    list_append(&t->rq_link, &r->rq_head);
135
    r->n++;
136
    spinlock_unlock(&r->lock);
137
 
475 jermar 138
    atomic_inc(&nrdy);
625 palkovsky 139
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 140
    atomic_inc(&cpu->nrdy);
1 jermar 141
 
413 jermar 142
    interrupts_restore(ipl);
1 jermar 143
}
144
 
107 decky 145
 
146
/** Create new thread
147
 *
148
 * Create a new thread.
149
 *
150
 * @param func  Thread's implementing function.
151
 * @param arg   Thread's implementing function argument.
152
 * @param task  Task to which the thread belongs.
153
 * @param flags Thread flags.
154
 *
155
 * @return New thread's structure on success, NULL on failure.
156
 *
157
 */
1 jermar 158
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
159
{
160
    thread_t *t;
161
    __address frame_ks, frame_us = NULL;
162
 
163
    t = (thread_t *) malloc(sizeof(thread_t));
164
    if (t) {
413 jermar 165
        ipl_t ipl;
1 jermar 166
 
552 palkovsky 167
        spinlock_initialize(&t->lock, "thread_t_lock");
1 jermar 168
 
762 palkovsky 169
        frame_ks = frame_alloc(FRAME_KA, ONE_FRAME, NULL, NULL);
1 jermar 170
        if (THREAD_USER_STACK & flags) {
762 palkovsky 171
            frame_us = frame_alloc(FRAME_KA, ONE_FRAME, NULL,NULL);
1 jermar 172
        }
173
 
413 jermar 174
        ipl = interrupts_disable();
1 jermar 175
        spinlock_lock(&tidlock);
176
        t->tid = ++last_tid;
177
        spinlock_unlock(&tidlock);
413 jermar 178
        interrupts_restore(ipl);
210 decky 179
 
1 jermar 180
        memsetb(frame_ks, THREAD_STACK_SIZE, 0);
181
        link_initialize(&t->rq_link);
182
        link_initialize(&t->wq_link);
183
        link_initialize(&t->th_link);
184
        link_initialize(&t->threads_link);
185
        t->kstack = (__u8 *) frame_ks;
186
        t->ustack = (__u8 *) frame_us;
187
 
188
        context_save(&t->saved_context);
414 jermar 189
        context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
184 jermar 190
 
191
        the_initialize((the_t *) t->kstack);
1 jermar 192
 
413 jermar 193
        ipl = interrupts_disable();
194
        t->saved_context.ipl = interrupts_read();
195
        interrupts_restore(ipl);
1 jermar 196
 
197
        t->thread_code = func;
198
        t->thread_arg = arg;
199
        t->ticks = -1;
413 jermar 200
        t->priority = -1;       /* start in rq[0] */
1 jermar 201
        t->cpu = NULL;
202
        t->flags = 0;
203
        t->state = Entering;
204
        t->call_me = NULL;
205
        t->call_me_with = NULL;
206
 
207
        timeout_initialize(&t->sleep_timeout);
208
        t->sleep_queue = NULL;
209
        t->timeout_pending = 0;
210
 
211
        t->rwlock_holder_type = RWLOCK_NONE;
212
 
213
        t->task = task;
214
 
73 vana 215
        t->fpu_context_exists=0;
216
        t->fpu_context_engaged=0;
217
 
1 jermar 218
        /*
219
         * Register this thread in the system-wide list.
220
         */
413 jermar 221
        ipl = interrupts_disable();    
1 jermar 222
        spinlock_lock(&threads_lock);
223
        list_append(&t->threads_link, &threads_head);
224
        spinlock_unlock(&threads_lock);
225
 
226
        /*
227
         * Attach to the containing task.
228
         */
229
        spinlock_lock(&task->lock);
230
        list_append(&t->th_link, &task->th_head);
231
        spinlock_unlock(&task->lock);
232
 
413 jermar 233
        interrupts_restore(ipl);
1 jermar 234
    }
235
 
236
    return t;
237
}
238
 
107 decky 239
 
240
/** Make thread exiting
241
 *
242
 * End current thread execution and switch it to the exiting
243
 * state. All pending timeouts are executed.
244
 *
245
 */
1 jermar 246
void thread_exit(void)
247
{
413 jermar 248
    ipl_t ipl;
1 jermar 249
 
250
restart:
413 jermar 251
    ipl = interrupts_disable();
15 jermar 252
    spinlock_lock(&THREAD->lock);
253
    if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
254
        spinlock_unlock(&THREAD->lock);
413 jermar 255
        interrupts_restore(ipl);
1 jermar 256
        goto restart;
257
    }
15 jermar 258
    THREAD->state = Exiting;
259
    spinlock_unlock(&THREAD->lock);
1 jermar 260
    scheduler();
261
}
262
 
107 decky 263
 
264
/** Thread sleep
265
 *
266
 * Suspend execution of the current thread.
267
 *
268
 * @param sec Number of seconds to sleep.
269
 *
270
 */
1 jermar 271
void thread_sleep(__u32 sec)
272
{
125 jermar 273
    thread_usleep(sec*1000000);
1 jermar 274
}
107 decky 275
 
276
 
277
/** Thread usleep
278
 *
279
 * Suspend execution of the current thread.
280
 *
281
 * @param usec Number of microseconds to sleep.
282
 *
283
 */
1 jermar 284
void thread_usleep(__u32 usec)
285
{
286
    waitq_t wq;
287
 
288
    waitq_initialize(&wq);
289
 
290
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
291
}
292
 
107 decky 293
 
294
/** Register thread out-of-context invocation
295
 *
296
 * Register a function and its argument to be executed
297
 * on next context switch to the current thread.
298
 *
299
 * @param call_me      Out-of-context function.
300
 * @param call_me_with Out-of-context function argument.
301
 *
302
 */
1 jermar 303
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
304
{
413 jermar 305
    ipl_t ipl;
1 jermar 306
 
413 jermar 307
    ipl = interrupts_disable();
15 jermar 308
    spinlock_lock(&THREAD->lock);
309
    THREAD->call_me = call_me;
310
    THREAD->call_me_with = call_me_with;
311
    spinlock_unlock(&THREAD->lock);
413 jermar 312
    interrupts_restore(ipl);
1 jermar 313
}
777 palkovsky 314
 
315
/** Print list of threads debug info */
316
void thread_print_list(void)
317
{
318
    link_t *cur;
319
    thread_t *t;
320
    ipl_t ipl;
321
 
322
    /* Messing with thread structures, avoid deadlock */
323
    ipl = interrupts_disable();
324
    spinlock_lock(&threads_lock);
325
 
326
    for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
327
        t = list_get_instance(cur, thread_t, threads_link);
328
        printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
329
        if (t->cpu)
330
            printf("cpu%d ", t->cpu->id);
331
 
332
        printf("\n");
333
    }
334
 
335
    spinlock_unlock(&threads_lock);
336
    interrupts_enable();
337
}