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1 jermar 1
/*
2
 * Copyright (C) 2001-2004 Jakub Jermar
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
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.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (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>
30
#include <proc/thread.h>
31
#include <proc/task.h>
32
#include <mm/frame.h>
33
#include <mm/page.h>
34
#include <arch/asm.h>
35
#include <arch.h>
36
#include <synch/synch.h>
37
#include <synch/spinlock.h>
38
#include <synch/waitq.h>
39
#include <synch/rwlock.h>
40
#include <cpu.h>
41
#include <func.h>
42
#include <context.h>
788 jermar 43
#include <adt/list.h>
1 jermar 44
#include <typedefs.h>
45
#include <time/clock.h>
788 jermar 46
#include <adt/list.h>
7 jermar 47
#include <config.h>
48
#include <arch/interrupt.h>
10 jermar 49
#include <smp/ipi.h>
76 jermar 50
#include <arch/faddr.h>
111 palkovsky 51
#include <arch/atomic.h>
195 vana 52
#include <memstr.h>
777 palkovsky 53
#include <print.h>
787 palkovsky 54
#include <mm/slab.h>
55
#include <debug.h>
1066 jermar 56
#include <main/uinit.h>
7 jermar 57
 
107 decky 58
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
1 jermar 59
 
623 jermar 60
SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
624 jermar 61
LIST_INITIALIZE(threads_head);      /**< List of all threads. */
1 jermar 62
 
623 jermar 63
SPINLOCK_INITIALIZE(tidlock);
1 jermar 64
__u32 last_tid = 0;
65
 
787 palkovsky 66
static slab_cache_t *thread_slab;
906 palkovsky 67
#ifdef ARCH_HAS_FPU
68
slab_cache_t *fpu_context_slab;
69
#endif
107 decky 70
 
787 palkovsky 71
 
107 decky 72
/** Thread wrapper
73
 *
74
 * This wrapper is provided to ensure that every thread
1 jermar 75
 * makes a call to thread_exit() when its implementing
76
 * function returns.
77
 *
413 jermar 78
 * interrupts_disable() is assumed.
107 decky 79
 *
1 jermar 80
 */
452 decky 81
static void cushion(void)
1 jermar 82
{
15 jermar 83
    void (*f)(void *) = THREAD->thread_code;
84
    void *arg = THREAD->thread_arg;
1 jermar 85
 
213 jermar 86
    /* this is where each thread wakes up after its creation */
22 jermar 87
    before_thread_runs();
88
 
15 jermar 89
    spinlock_unlock(&THREAD->lock);
413 jermar 90
    interrupts_enable();
1 jermar 91
 
92
    f(arg);
93
    thread_exit();
94
    /* not reached */
95
}
96
 
787 palkovsky 97
/** Initialization and allocation for thread_t structure */
98
static int thr_constructor(void *obj, int kmflags)
99
{
100
    thread_t *t = (thread_t *)obj;
814 palkovsky 101
    pfn_t pfn;
842 palkovsky 102
    int status;
107 decky 103
 
787 palkovsky 104
    spinlock_initialize(&t->lock, "thread_t_lock");
105
    link_initialize(&t->rq_link);
106
    link_initialize(&t->wq_link);
107
    link_initialize(&t->th_link);
108
    link_initialize(&t->threads_link);
109
 
906 palkovsky 110
#ifdef ARCH_HAS_FPU
111
#  ifdef CONFIG_FPU_LAZY
112
    t->saved_fpu_context = NULL;
113
#  else
114
    t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
115
    if (!t->saved_fpu_context)
116
        return -1;
117
#  endif
118
#endif  
119
 
935 vana 120
    pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA | kmflags,&status);
906 palkovsky 121
    if (status) {
122
#ifdef ARCH_HAS_FPU
123
        if (t->saved_fpu_context)
124
            slab_free(fpu_context_slab,t->saved_fpu_context);
125
#endif
842 palkovsky 126
        return -1;
906 palkovsky 127
    }
814 palkovsky 128
    t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
787 palkovsky 129
 
130
    return 0;
131
}
132
 
133
/** Destruction of thread_t object */
134
static int thr_destructor(void *obj)
135
{
136
    thread_t *t = (thread_t *)obj;
137
 
814 palkovsky 138
    frame_free(ADDR2PFN(KA2PA(t->kstack)));
906 palkovsky 139
#ifdef ARCH_HAS_FPU
140
    if (t->saved_fpu_context)
141
        slab_free(fpu_context_slab,t->saved_fpu_context);
142
#endif
787 palkovsky 143
    return 1; /* One page freed */
144
}
145
 
107 decky 146
/** Initialize threads
147
 *
148
 * Initialize kernel threads support.
149
 *
150
 */
1 jermar 151
void thread_init(void)
152
{
15 jermar 153
    THREAD = NULL;
625 palkovsky 154
    atomic_set(&nrdy,0);
787 palkovsky 155
    thread_slab = slab_cache_create("thread_slab",
156
                    sizeof(thread_t),0,
157
                    thr_constructor, thr_destructor, 0);
906 palkovsky 158
#ifdef ARCH_HAS_FPU
159
    fpu_context_slab = slab_cache_create("fpu_slab",
160
                         sizeof(fpu_context_t),
161
                         FPU_CONTEXT_ALIGN,
162
                         NULL, NULL, 0);
163
#endif
1 jermar 164
}
165
 
107 decky 166
 
167
/** Make thread ready
168
 *
169
 * Switch thread t to the ready state.
170
 *
171
 * @param t Thread to make ready.
172
 *
173
 */
1 jermar 174
void thread_ready(thread_t *t)
175
{
176
    cpu_t *cpu;
177
    runq_t *r;
413 jermar 178
    ipl_t ipl;
625 palkovsky 179
    int i, avg;
1 jermar 180
 
413 jermar 181
    ipl = interrupts_disable();
1 jermar 182
 
183
    spinlock_lock(&t->lock);
184
 
413 jermar 185
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
1 jermar 186
 
16 jermar 187
    cpu = CPU;
1 jermar 188
    if (t->flags & X_WIRED) {
189
        cpu = t->cpu;
190
    }
191
    spinlock_unlock(&t->lock);
192
 
107 decky 193
    /*
1 jermar 194
     * Append t to respective ready queue on respective processor.
195
     */
196
    r = &cpu->rq[i];
197
    spinlock_lock(&r->lock);
198
    list_append(&t->rq_link, &r->rq_head);
199
    r->n++;
200
    spinlock_unlock(&r->lock);
201
 
475 jermar 202
    atomic_inc(&nrdy);
625 palkovsky 203
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 204
    atomic_inc(&cpu->nrdy);
1 jermar 205
 
413 jermar 206
    interrupts_restore(ipl);
1 jermar 207
}
208
 
107 decky 209
 
787 palkovsky 210
/** Destroy thread memory structure
211
 *
212
 * Detach thread from all queues, cpus etc. and destroy it.
213
 *
214
 * Assume thread->lock is held!!
215
 */
216
void thread_destroy(thread_t *t)
217
{
218
    ASSERT(t->state == Exiting);
219
    ASSERT(t->task);
220
    ASSERT(t->cpu);
221
 
222
    spinlock_lock(&t->cpu->lock);
223
    if(t->cpu->fpu_owner==t)
224
        t->cpu->fpu_owner=NULL;
225
    spinlock_unlock(&t->cpu->lock);
226
 
227
    /*
228
     * Detach from the containing task.
229
     */
230
    spinlock_lock(&t->task->lock);
231
    list_remove(&t->th_link);
232
    spinlock_unlock(&t->task->lock);
233
 
234
    spinlock_unlock(&t->lock);
235
 
236
    spinlock_lock(&threads_lock);
237
    list_remove(&t->threads_link);
238
    spinlock_unlock(&threads_lock);
239
 
240
    slab_free(thread_slab, t);
241
}
242
 
243
 
107 decky 244
/** Create new thread
245
 *
246
 * Create a new thread.
247
 *
248
 * @param func  Thread's implementing function.
249
 * @param arg   Thread's implementing function argument.
250
 * @param task  Task to which the thread belongs.
251
 * @param flags Thread flags.
1062 jermar 252
 * @param name  Symbolic name.
107 decky 253
 *
254
 * @return New thread's structure on success, NULL on failure.
255
 *
256
 */
1062 jermar 257
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name)
1 jermar 258
{
259
    thread_t *t;
822 palkovsky 260
    ipl_t ipl;
261
 
787 palkovsky 262
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 263
    if (!t)
264
        return NULL;
1 jermar 265
 
822 palkovsky 266
    /* Not needed, but good for debugging */
267
    memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
268
 
269
    ipl = interrupts_disable();
270
    spinlock_lock(&tidlock);
271
    t->tid = ++last_tid;
272
    spinlock_unlock(&tidlock);
273
    interrupts_restore(ipl);
274
 
275
    context_save(&t->saved_context);
276
    context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
277
 
278
    the_initialize((the_t *) t->kstack);
279
 
280
    ipl = interrupts_disable();
281
    t->saved_context.ipl = interrupts_read();
282
    interrupts_restore(ipl);
283
 
1066 jermar 284
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
285
 
822 palkovsky 286
    t->thread_code = func;
287
    t->thread_arg = arg;
288
    t->ticks = -1;
289
    t->priority = -1;       /* start in rq[0] */
290
    t->cpu = NULL;
291
    t->flags = 0;
292
    t->state = Entering;
293
    t->call_me = NULL;
294
    t->call_me_with = NULL;
295
 
296
    timeout_initialize(&t->sleep_timeout);
297
    t->sleep_queue = NULL;
298
    t->timeout_pending = 0;
299
 
300
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 301
 
822 palkovsky 302
    t->task = task;
303
 
860 decky 304
    t->fpu_context_exists = 0;
305
    t->fpu_context_engaged = 0;
822 palkovsky 306
 
307
    /*
308
     * Register this thread in the system-wide list.
309
     */
310
    ipl = interrupts_disable();
311
    spinlock_lock(&threads_lock);
312
    list_append(&t->threads_link, &threads_head);
313
    spinlock_unlock(&threads_lock);
314
 
315
    /*
316
     * Attach to the containing task.
317
     */
318
    spinlock_lock(&task->lock);
319
    list_append(&t->th_link, &task->th_head);
320
    spinlock_unlock(&task->lock);
321
 
322
    interrupts_restore(ipl);
860 decky 323
 
1 jermar 324
    return t;
325
}
326
 
107 decky 327
 
328
/** Make thread exiting
329
 *
330
 * End current thread execution and switch it to the exiting
331
 * state. All pending timeouts are executed.
332
 *
333
 */
1 jermar 334
void thread_exit(void)
335
{
413 jermar 336
    ipl_t ipl;
1 jermar 337
 
338
restart:
413 jermar 339
    ipl = interrupts_disable();
15 jermar 340
    spinlock_lock(&THREAD->lock);
341
    if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
342
        spinlock_unlock(&THREAD->lock);
413 jermar 343
        interrupts_restore(ipl);
1 jermar 344
        goto restart;
345
    }
15 jermar 346
    THREAD->state = Exiting;
347
    spinlock_unlock(&THREAD->lock);
1 jermar 348
    scheduler();
349
}
350
 
107 decky 351
 
352
/** Thread sleep
353
 *
354
 * Suspend execution of the current thread.
355
 *
356
 * @param sec Number of seconds to sleep.
357
 *
358
 */
1 jermar 359
void thread_sleep(__u32 sec)
360
{
125 jermar 361
    thread_usleep(sec*1000000);
1 jermar 362
}
107 decky 363
 
364
 
365
/** Thread usleep
366
 *
367
 * Suspend execution of the current thread.
368
 *
369
 * @param usec Number of microseconds to sleep.
370
 *
371
 */
1 jermar 372
void thread_usleep(__u32 usec)
373
{
374
    waitq_t wq;
375
 
376
    waitq_initialize(&wq);
377
 
378
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
379
}
380
 
107 decky 381
 
382
/** Register thread out-of-context invocation
383
 *
384
 * Register a function and its argument to be executed
385
 * on next context switch to the current thread.
386
 *
387
 * @param call_me      Out-of-context function.
388
 * @param call_me_with Out-of-context function argument.
389
 *
390
 */
1 jermar 391
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
392
{
413 jermar 393
    ipl_t ipl;
1 jermar 394
 
413 jermar 395
    ipl = interrupts_disable();
15 jermar 396
    spinlock_lock(&THREAD->lock);
397
    THREAD->call_me = call_me;
398
    THREAD->call_me_with = call_me_with;
399
    spinlock_unlock(&THREAD->lock);
413 jermar 400
    interrupts_restore(ipl);
1 jermar 401
}
777 palkovsky 402
 
403
/** Print list of threads debug info */
404
void thread_print_list(void)
405
{
406
    link_t *cur;
407
    thread_t *t;
408
    ipl_t ipl;
409
 
410
    /* Messing with thread structures, avoid deadlock */
411
    ipl = interrupts_disable();
412
    spinlock_lock(&threads_lock);
413
 
414
    for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
415
        t = list_get_instance(cur, thread_t, threads_link);
1062 jermar 416
        printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",
417
            t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
777 palkovsky 418
        if (t->cpu)
419
            printf("cpu%d ", t->cpu->id);
1062 jermar 420
        else
421
            printf("none");
777 palkovsky 422
        printf("\n");
423
    }
424
 
425
    spinlock_unlock(&threads_lock);
1060 palkovsky 426
    interrupts_restore(ipl);
777 palkovsky 427
}
1066 jermar 428
 
429
/** Process syscall to create new thread.
430
 *
431
 */
432
__native sys_thread_create(__address function, void *arg, void *stack, char *name)
433
{
434
        thread_t *t;
435
        char namebuf[THREAD_NAME_BUFLEN];
436
    uspace_arg_t *uarg;
437
    __u32 tid;
438
 
439
        copy_from_uspace(namebuf, name, THREAD_NAME_BUFLEN);
440
    uarg = (uspace_arg_t *) malloc(sizeof(uarg), 0);
441
 
442
    uarg->uspace_entry = function;
443
    uarg->uspace_stack = (__address) stack;
444
 
445
        if ((t = thread_create(uinit, uarg, TASK, 0, namebuf))) {
446
        tid = t->tid;
447
                thread_ready(t);
448
        return (__native) tid;
449
        } else {
450
                free(namebuf);
451
        }
452
 
453
        return (__native) -1;
454
}
455
 
456
/** Process syscall to terminate thread.
457
 *
458
 */
459
__native sys_thread_exit(int status)
460
{
461
        thread_exit();
462
        /* Unreachable */
463
        return 0;
464
}