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1 jermar 1
/*
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 * 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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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * 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
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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29
#include <proc/scheduler.h>
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#include <proc/thread.h>
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#include <proc/task.h>
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#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>
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#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>
7 jermar 54
 
107 decky 55
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
1 jermar 56
 
57
spinlock_t threads_lock;
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link_t threads_head;
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60
static spinlock_t tidlock;
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__u32 last_tid = 0;
62
 
107 decky 63
 
64
/** Thread wrapper
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 *
66
 * This wrapper is provided to ensure that every thread
1 jermar 67
 * makes a call to thread_exit() when its implementing
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 * function returns.
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 *
413 jermar 70
 * interrupts_disable() is assumed.
107 decky 71
 *
1 jermar 72
 */
73
void cushion(void)
74
{
15 jermar 75
    void (*f)(void *) = THREAD->thread_code;
76
    void *arg = THREAD->thread_arg;
1 jermar 77
 
213 jermar 78
    /* this is where each thread wakes up after its creation */
22 jermar 79
    before_thread_runs();
80
 
15 jermar 81
    spinlock_unlock(&THREAD->lock);
413 jermar 82
    interrupts_enable();
1 jermar 83
 
84
    f(arg);
85
    thread_exit();
86
    /* not reached */
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}
88
 
107 decky 89
 
90
/** Initialize threads
91
 *
92
 * Initialize kernel threads support.
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 *
94
 */
1 jermar 95
void thread_init(void)
96
{
15 jermar 97
    THREAD = NULL;
1 jermar 98
    nrdy = 0;
99
    spinlock_initialize(&threads_lock);
100
    list_initialize(&threads_head);
101
}
102
 
107 decky 103
 
104
/** Make thread ready
105
 *
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 * Switch thread t to the ready state.
107
 *
108
 * @param t Thread to make ready.
109
 *
110
 */
1 jermar 111
void thread_ready(thread_t *t)
112
{
113
    cpu_t *cpu;
114
    runq_t *r;
413 jermar 115
    ipl_t ipl;
7 jermar 116
    int i, avg, send_ipi = 0;
1 jermar 117
 
413 jermar 118
    ipl = interrupts_disable();
1 jermar 119
 
120
    spinlock_lock(&t->lock);
121
 
413 jermar 122
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
1 jermar 123
 
16 jermar 124
    cpu = CPU;
1 jermar 125
    if (t->flags & X_WIRED) {
126
        cpu = t->cpu;
127
    }
128
    spinlock_unlock(&t->lock);
129
 
107 decky 130
    /*
1 jermar 131
     * Append t to respective ready queue on respective processor.
132
     */
133
    r = &cpu->rq[i];
134
    spinlock_lock(&r->lock);
135
    list_append(&t->rq_link, &r->rq_head);
136
    r->n++;
137
    spinlock_unlock(&r->lock);
138
 
248 jermar 139
    atomic_inc((int *) &nrdy);
111 palkovsky 140
    avg = nrdy / config.cpu_active;
1 jermar 141
 
142
    spinlock_lock(&cpu->lock);
10 jermar 143
    if ((++cpu->nrdy) > avg) {
7 jermar 144
        /*
145
         * If there are idle halted CPU's, this will wake them up.
146
         */
8 jermar 147
        ipi_broadcast(VECTOR_WAKEUP_IPI);
7 jermar 148
    }  
1 jermar 149
    spinlock_unlock(&cpu->lock);
125 jermar 150
 
413 jermar 151
    interrupts_restore(ipl);
1 jermar 152
}
153
 
107 decky 154
 
155
/** Create new thread
156
 *
157
 * Create a new thread.
158
 *
159
 * @param func  Thread's implementing function.
160
 * @param arg   Thread's implementing function argument.
161
 * @param task  Task to which the thread belongs.
162
 * @param flags Thread flags.
163
 *
164
 * @return New thread's structure on success, NULL on failure.
165
 *
166
 */
1 jermar 167
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
168
{
169
    thread_t *t;
170
    __address frame_ks, frame_us = NULL;
171
 
172
    t = (thread_t *) malloc(sizeof(thread_t));
173
    if (t) {
413 jermar 174
        ipl_t ipl;
1 jermar 175
 
176
        spinlock_initialize(&t->lock);
177
 
178
        frame_ks = frame_alloc(FRAME_KA);
179
        if (THREAD_USER_STACK & flags) {
115 jermar 180
            frame_us = frame_alloc(FRAME_KA);
1 jermar 181
        }
182
 
413 jermar 183
        ipl = interrupts_disable();
1 jermar 184
        spinlock_lock(&tidlock);
185
        t->tid = ++last_tid;
186
        spinlock_unlock(&tidlock);
413 jermar 187
        interrupts_restore(ipl);
210 decky 188
 
1 jermar 189
        memsetb(frame_ks, THREAD_STACK_SIZE, 0);
190
        link_initialize(&t->rq_link);
191
        link_initialize(&t->wq_link);
192
        link_initialize(&t->th_link);
193
        link_initialize(&t->threads_link);
194
        t->kstack = (__u8 *) frame_ks;
195
        t->ustack = (__u8 *) frame_us;
196
 
197
        context_save(&t->saved_context);
97 jermar 198
        context_set(&t->saved_context, FADDR(cushion), t->kstack, THREAD_STACK_SIZE);
184 jermar 199
 
200
        the_initialize((the_t *) t->kstack);
1 jermar 201
 
413 jermar 202
        ipl = interrupts_disable();
203
        t->saved_context.ipl = interrupts_read();
204
        interrupts_restore(ipl);
1 jermar 205
 
206
        t->thread_code = func;
207
        t->thread_arg = arg;
208
        t->ticks = -1;
413 jermar 209
        t->priority = -1;       /* start in rq[0] */
1 jermar 210
        t->cpu = NULL;
211
        t->flags = 0;
212
        t->state = Entering;
213
        t->call_me = NULL;
214
        t->call_me_with = NULL;
215
 
216
        timeout_initialize(&t->sleep_timeout);
217
        t->sleep_queue = NULL;
218
        t->timeout_pending = 0;
219
 
220
        t->rwlock_holder_type = RWLOCK_NONE;
221
 
222
        t->task = task;
223
 
73 vana 224
        t->fpu_context_exists=0;
225
        t->fpu_context_engaged=0;
226
 
1 jermar 227
        /*
228
         * Register this thread in the system-wide list.
229
         */
413 jermar 230
        ipl = interrupts_disable();    
1 jermar 231
        spinlock_lock(&threads_lock);
232
        list_append(&t->threads_link, &threads_head);
233
        spinlock_unlock(&threads_lock);
234
 
235
        /*
236
         * Attach to the containing task.
237
         */
238
        spinlock_lock(&task->lock);
239
        list_append(&t->th_link, &task->th_head);
240
        spinlock_unlock(&task->lock);
241
 
413 jermar 242
        interrupts_restore(ipl);
1 jermar 243
    }
244
 
245
    return t;
246
}
247
 
107 decky 248
 
249
/** Make thread exiting
250
 *
251
 * End current thread execution and switch it to the exiting
252
 * state. All pending timeouts are executed.
253
 *
254
 */
1 jermar 255
void thread_exit(void)
256
{
413 jermar 257
    ipl_t ipl;
1 jermar 258
 
259
restart:
413 jermar 260
    ipl = interrupts_disable();
15 jermar 261
    spinlock_lock(&THREAD->lock);
262
    if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
263
        spinlock_unlock(&THREAD->lock);
413 jermar 264
        interrupts_restore(ipl);
1 jermar 265
        goto restart;
266
    }
15 jermar 267
    THREAD->state = Exiting;
268
    spinlock_unlock(&THREAD->lock);
1 jermar 269
    scheduler();
270
}
271
 
107 decky 272
 
273
/** Thread sleep
274
 *
275
 * Suspend execution of the current thread.
276
 *
277
 * @param sec Number of seconds to sleep.
278
 *
279
 */
1 jermar 280
void thread_sleep(__u32 sec)
281
{
125 jermar 282
    thread_usleep(sec*1000000);
1 jermar 283
}
107 decky 284
 
285
 
286
/** Thread usleep
287
 *
288
 * Suspend execution of the current thread.
289
 *
290
 * @param usec Number of microseconds to sleep.
291
 *
292
 */
1 jermar 293
void thread_usleep(__u32 usec)
294
{
295
    waitq_t wq;
296
 
297
    waitq_initialize(&wq);
298
 
299
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
300
}
301
 
107 decky 302
 
303
/** Register thread out-of-context invocation
304
 *
305
 * Register a function and its argument to be executed
306
 * on next context switch to the current thread.
307
 *
308
 * @param call_me      Out-of-context function.
309
 * @param call_me_with Out-of-context function argument.
310
 *
311
 */
1 jermar 312
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
313
{
413 jermar 314
    ipl_t ipl;
1 jermar 315
 
413 jermar 316
    ipl = interrupts_disable();
15 jermar 317
    spinlock_lock(&THREAD->lock);
318
    THREAD->call_me = call_me;
319
    THREAD->call_me_with = call_me_with;
320
    spinlock_unlock(&THREAD->lock);
413 jermar 321
    interrupts_restore(ipl);
1 jermar 322
}