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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>
1078 jermar 32
#include <proc/uarg.h>
1 jermar 33
#include <mm/frame.h>
34
#include <mm/page.h>
35
#include <arch/asm.h>
36
#include <arch.h>
37
#include <synch/synch.h>
38
#include <synch/spinlock.h>
39
#include <synch/waitq.h>
40
#include <synch/rwlock.h>
41
#include <cpu.h>
42
#include <func.h>
43
#include <context.h>
788 jermar 44
#include <adt/list.h>
1 jermar 45
#include <typedefs.h>
46
#include <time/clock.h>
788 jermar 47
#include <adt/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>
787 palkovsky 55
#include <mm/slab.h>
56
#include <debug.h>
1066 jermar 57
#include <main/uinit.h>
7 jermar 58
 
107 decky 59
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
1 jermar 60
 
623 jermar 61
SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
624 jermar 62
LIST_INITIALIZE(threads_head);      /**< List of all threads. */
1 jermar 63
 
623 jermar 64
SPINLOCK_INITIALIZE(tidlock);
1 jermar 65
__u32 last_tid = 0;
66
 
787 palkovsky 67
static slab_cache_t *thread_slab;
906 palkovsky 68
#ifdef ARCH_HAS_FPU
69
slab_cache_t *fpu_context_slab;
70
#endif
107 decky 71
 
787 palkovsky 72
 
107 decky 73
/** Thread wrapper
74
 *
75
 * This wrapper is provided to ensure that every thread
1 jermar 76
 * makes a call to thread_exit() when its implementing
77
 * function returns.
78
 *
413 jermar 79
 * interrupts_disable() is assumed.
107 decky 80
 *
1 jermar 81
 */
452 decky 82
static void cushion(void)
1 jermar 83
{
15 jermar 84
    void (*f)(void *) = THREAD->thread_code;
85
    void *arg = THREAD->thread_arg;
1 jermar 86
 
213 jermar 87
    /* this is where each thread wakes up after its creation */
22 jermar 88
    before_thread_runs();
89
 
15 jermar 90
    spinlock_unlock(&THREAD->lock);
413 jermar 91
    interrupts_enable();
1 jermar 92
 
93
    f(arg);
94
    thread_exit();
95
    /* not reached */
96
}
97
 
787 palkovsky 98
/** Initialization and allocation for thread_t structure */
99
static int thr_constructor(void *obj, int kmflags)
100
{
101
    thread_t *t = (thread_t *)obj;
814 palkovsky 102
    pfn_t pfn;
842 palkovsky 103
    int status;
107 decky 104
 
787 palkovsky 105
    spinlock_initialize(&t->lock, "thread_t_lock");
106
    link_initialize(&t->rq_link);
107
    link_initialize(&t->wq_link);
108
    link_initialize(&t->th_link);
109
    link_initialize(&t->threads_link);
110
 
906 palkovsky 111
#ifdef ARCH_HAS_FPU
112
#  ifdef CONFIG_FPU_LAZY
113
    t->saved_fpu_context = NULL;
114
#  else
115
    t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
116
    if (!t->saved_fpu_context)
117
        return -1;
118
#  endif
119
#endif  
120
 
935 vana 121
    pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA | kmflags,&status);
906 palkovsky 122
    if (status) {
123
#ifdef ARCH_HAS_FPU
124
        if (t->saved_fpu_context)
125
            slab_free(fpu_context_slab,t->saved_fpu_context);
126
#endif
842 palkovsky 127
        return -1;
906 palkovsky 128
    }
814 palkovsky 129
    t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
787 palkovsky 130
 
131
    return 0;
132
}
133
 
134
/** Destruction of thread_t object */
135
static int thr_destructor(void *obj)
136
{
137
    thread_t *t = (thread_t *)obj;
138
 
814 palkovsky 139
    frame_free(ADDR2PFN(KA2PA(t->kstack)));
906 palkovsky 140
#ifdef ARCH_HAS_FPU
141
    if (t->saved_fpu_context)
142
        slab_free(fpu_context_slab,t->saved_fpu_context);
143
#endif
787 palkovsky 144
    return 1; /* One page freed */
145
}
146
 
107 decky 147
/** Initialize threads
148
 *
149
 * Initialize kernel threads support.
150
 *
151
 */
1 jermar 152
void thread_init(void)
153
{
15 jermar 154
    THREAD = NULL;
625 palkovsky 155
    atomic_set(&nrdy,0);
787 palkovsky 156
    thread_slab = slab_cache_create("thread_slab",
157
                    sizeof(thread_t),0,
158
                    thr_constructor, thr_destructor, 0);
906 palkovsky 159
#ifdef ARCH_HAS_FPU
160
    fpu_context_slab = slab_cache_create("fpu_slab",
161
                         sizeof(fpu_context_t),
162
                         FPU_CONTEXT_ALIGN,
163
                         NULL, NULL, 0);
164
#endif
1 jermar 165
}
166
 
107 decky 167
 
168
/** Make thread ready
169
 *
170
 * Switch thread t to the ready state.
171
 *
172
 * @param t Thread to make ready.
173
 *
174
 */
1 jermar 175
void thread_ready(thread_t *t)
176
{
177
    cpu_t *cpu;
178
    runq_t *r;
413 jermar 179
    ipl_t ipl;
625 palkovsky 180
    int i, avg;
1 jermar 181
 
413 jermar 182
    ipl = interrupts_disable();
1 jermar 183
 
184
    spinlock_lock(&t->lock);
185
 
413 jermar 186
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
1 jermar 187
 
16 jermar 188
    cpu = CPU;
1 jermar 189
    if (t->flags & X_WIRED) {
190
        cpu = t->cpu;
191
    }
192
    spinlock_unlock(&t->lock);
193
 
107 decky 194
    /*
1 jermar 195
     * Append t to respective ready queue on respective processor.
196
     */
197
    r = &cpu->rq[i];
198
    spinlock_lock(&r->lock);
199
    list_append(&t->rq_link, &r->rq_head);
200
    r->n++;
201
    spinlock_unlock(&r->lock);
202
 
475 jermar 203
    atomic_inc(&nrdy);
625 palkovsky 204
    avg = atomic_get(&nrdy) / config.cpu_active;
783 palkovsky 205
    atomic_inc(&cpu->nrdy);
1 jermar 206
 
413 jermar 207
    interrupts_restore(ipl);
1 jermar 208
}
209
 
107 decky 210
 
787 palkovsky 211
/** Destroy thread memory structure
212
 *
213
 * Detach thread from all queues, cpus etc. and destroy it.
214
 *
215
 * Assume thread->lock is held!!
216
 */
217
void thread_destroy(thread_t *t)
218
{
219
    ASSERT(t->state == Exiting);
220
    ASSERT(t->task);
221
    ASSERT(t->cpu);
222
 
223
    spinlock_lock(&t->cpu->lock);
224
    if(t->cpu->fpu_owner==t)
225
        t->cpu->fpu_owner=NULL;
226
    spinlock_unlock(&t->cpu->lock);
227
 
228
    /*
229
     * Detach from the containing task.
230
     */
231
    spinlock_lock(&t->task->lock);
232
    list_remove(&t->th_link);
233
    spinlock_unlock(&t->task->lock);
234
 
235
    spinlock_unlock(&t->lock);
236
 
237
    spinlock_lock(&threads_lock);
238
    list_remove(&t->threads_link);
239
    spinlock_unlock(&threads_lock);
240
 
241
    slab_free(thread_slab, t);
242
}
243
 
244
 
107 decky 245
/** Create new thread
246
 *
247
 * Create a new thread.
248
 *
249
 * @param func  Thread's implementing function.
250
 * @param arg   Thread's implementing function argument.
251
 * @param task  Task to which the thread belongs.
252
 * @param flags Thread flags.
1062 jermar 253
 * @param name  Symbolic name.
107 decky 254
 *
255
 * @return New thread's structure on success, NULL on failure.
256
 *
257
 */
1062 jermar 258
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name)
1 jermar 259
{
260
    thread_t *t;
822 palkovsky 261
    ipl_t ipl;
262
 
787 palkovsky 263
    t = (thread_t *) slab_alloc(thread_slab, 0);
842 palkovsky 264
    if (!t)
265
        return NULL;
1 jermar 266
 
822 palkovsky 267
    /* Not needed, but good for debugging */
268
    memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
269
 
270
    ipl = interrupts_disable();
271
    spinlock_lock(&tidlock);
272
    t->tid = ++last_tid;
273
    spinlock_unlock(&tidlock);
274
    interrupts_restore(ipl);
275
 
276
    context_save(&t->saved_context);
277
    context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
278
 
279
    the_initialize((the_t *) t->kstack);
280
 
281
    ipl = interrupts_disable();
282
    t->saved_context.ipl = interrupts_read();
283
    interrupts_restore(ipl);
284
 
1066 jermar 285
    memcpy(t->name, name, THREAD_NAME_BUFLEN);
286
 
822 palkovsky 287
    t->thread_code = func;
288
    t->thread_arg = arg;
289
    t->ticks = -1;
290
    t->priority = -1;       /* start in rq[0] */
291
    t->cpu = NULL;
292
    t->flags = 0;
293
    t->state = Entering;
294
    t->call_me = NULL;
295
    t->call_me_with = NULL;
296
 
297
    timeout_initialize(&t->sleep_timeout);
298
    t->sleep_queue = NULL;
299
    t->timeout_pending = 0;
300
 
301
    t->rwlock_holder_type = RWLOCK_NONE;
210 decky 302
 
822 palkovsky 303
    t->task = task;
304
 
860 decky 305
    t->fpu_context_exists = 0;
306
    t->fpu_context_engaged = 0;
822 palkovsky 307
 
308
    /*
309
     * Register this thread in the system-wide list.
310
     */
311
    ipl = interrupts_disable();
312
    spinlock_lock(&threads_lock);
313
    list_append(&t->threads_link, &threads_head);
314
    spinlock_unlock(&threads_lock);
315
 
316
    /*
317
     * Attach to the containing task.
318
     */
319
    spinlock_lock(&task->lock);
320
    list_append(&t->th_link, &task->th_head);
321
    spinlock_unlock(&task->lock);
322
 
323
    interrupts_restore(ipl);
860 decky 324
 
1 jermar 325
    return t;
326
}
327
 
107 decky 328
 
329
/** Make thread exiting
330
 *
331
 * End current thread execution and switch it to the exiting
332
 * state. All pending timeouts are executed.
333
 *
334
 */
1 jermar 335
void thread_exit(void)
336
{
413 jermar 337
    ipl_t ipl;
1 jermar 338
 
339
restart:
413 jermar 340
    ipl = interrupts_disable();
15 jermar 341
    spinlock_lock(&THREAD->lock);
342
    if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
343
        spinlock_unlock(&THREAD->lock);
413 jermar 344
        interrupts_restore(ipl);
1 jermar 345
        goto restart;
346
    }
15 jermar 347
    THREAD->state = Exiting;
348
    spinlock_unlock(&THREAD->lock);
1 jermar 349
    scheduler();
350
}
351
 
107 decky 352
 
353
/** Thread sleep
354
 *
355
 * Suspend execution of the current thread.
356
 *
357
 * @param sec Number of seconds to sleep.
358
 *
359
 */
1 jermar 360
void thread_sleep(__u32 sec)
361
{
125 jermar 362
    thread_usleep(sec*1000000);
1 jermar 363
}
107 decky 364
 
365
 
366
/** Thread usleep
367
 *
368
 * Suspend execution of the current thread.
369
 *
370
 * @param usec Number of microseconds to sleep.
371
 *
372
 */
1 jermar 373
void thread_usleep(__u32 usec)
374
{
375
    waitq_t wq;
376
 
377
    waitq_initialize(&wq);
378
 
379
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
380
}
381
 
107 decky 382
 
383
/** Register thread out-of-context invocation
384
 *
385
 * Register a function and its argument to be executed
386
 * on next context switch to the current thread.
387
 *
388
 * @param call_me      Out-of-context function.
389
 * @param call_me_with Out-of-context function argument.
390
 *
391
 */
1 jermar 392
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
393
{
413 jermar 394
    ipl_t ipl;
1 jermar 395
 
413 jermar 396
    ipl = interrupts_disable();
15 jermar 397
    spinlock_lock(&THREAD->lock);
398
    THREAD->call_me = call_me;
399
    THREAD->call_me_with = call_me_with;
400
    spinlock_unlock(&THREAD->lock);
413 jermar 401
    interrupts_restore(ipl);
1 jermar 402
}
777 palkovsky 403
 
404
/** Print list of threads debug info */
405
void thread_print_list(void)
406
{
407
    link_t *cur;
408
    thread_t *t;
409
    ipl_t ipl;
410
 
411
    /* Messing with thread structures, avoid deadlock */
412
    ipl = interrupts_disable();
413
    spinlock_lock(&threads_lock);
414
 
415
    for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
416
        t = list_get_instance(cur, thread_t, threads_link);
1062 jermar 417
        printf("%s: address=%P, tid=%d, state=%s, task=%P, code=%P, stack=%P, cpu=",
418
            t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack);
777 palkovsky 419
        if (t->cpu)
420
            printf("cpu%d ", t->cpu->id);
1062 jermar 421
        else
422
            printf("none");
777 palkovsky 423
        printf("\n");
424
    }
425
 
426
    spinlock_unlock(&threads_lock);
1060 palkovsky 427
    interrupts_restore(ipl);
777 palkovsky 428
}
1066 jermar 429
 
430
/** Process syscall to create new thread.
431
 *
432
 */
1078 jermar 433
__native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name)
1066 jermar 434
{
435
        thread_t *t;
436
        char namebuf[THREAD_NAME_BUFLEN];
1078 jermar 437
    uspace_arg_t *kernel_uarg;      /* TODO: store kernel_uarg in thread_t */
1066 jermar 438
    __u32 tid;
439
 
1078 jermar 440
        copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN);
1066 jermar 441
 
1078 jermar 442
    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
443
    copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t));
444
 
445
        if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) {
1066 jermar 446
        tid = t->tid;
447
                thread_ready(t);
448
        return (__native) tid;
449
        } else {
1078 jermar 450
        free(kernel_uarg);
1066 jermar 451
        }
452
 
453
        return (__native) -1;
454
}
455
 
456
/** Process syscall to terminate thread.
457
 *
458
 */
1078 jermar 459
__native sys_thread_exit(int uspace_status)
1066 jermar 460
{
461
        thread_exit();
462
        /* Unreachable */
463
        return 0;
464
}