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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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#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
 
623 jermar 57
SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
624 jermar 58
LIST_INITIALIZE(threads_head);      /**< List of all threads. */
1 jermar 59
 
623 jermar 60
SPINLOCK_INITIALIZE(tidlock);
1 jermar 61
__u32 last_tid = 0;
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107 decky 63
 
64
/** Thread wrapper
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 *
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 * 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
 */
452 decky 73
static void cushion(void)
1 jermar 74
{
15 jermar 75
    void (*f)(void *) = THREAD->thread_code;
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    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 */
87
}
88
 
107 decky 89
 
90
/** Initialize threads
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 *
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 * Initialize kernel threads support.
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 *
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 */
1 jermar 95
void thread_init(void)
96
{
15 jermar 97
    THREAD = NULL;
625 palkovsky 98
    atomic_set(&nrdy,0);
1 jermar 99
}
100
 
107 decky 101
 
102
/** Make thread ready
103
 *
104
 * Switch thread t to the ready state.
105
 *
106
 * @param t Thread to make ready.
107
 *
108
 */
1 jermar 109
void thread_ready(thread_t *t)
110
{
111
    cpu_t *cpu;
112
    runq_t *r;
413 jermar 113
    ipl_t ipl;
625 palkovsky 114
    int i, avg;
1 jermar 115
 
413 jermar 116
    ipl = interrupts_disable();
1 jermar 117
 
118
    spinlock_lock(&t->lock);
119
 
413 jermar 120
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
1 jermar 121
 
16 jermar 122
    cpu = CPU;
1 jermar 123
    if (t->flags & X_WIRED) {
124
        cpu = t->cpu;
125
    }
126
    spinlock_unlock(&t->lock);
127
 
107 decky 128
    /*
1 jermar 129
     * Append t to respective ready queue on respective processor.
130
     */
131
    r = &cpu->rq[i];
132
    spinlock_lock(&r->lock);
133
    list_append(&t->rq_link, &r->rq_head);
134
    r->n++;
135
    spinlock_unlock(&r->lock);
136
 
475 jermar 137
    atomic_inc(&nrdy);
625 palkovsky 138
    avg = atomic_get(&nrdy) / config.cpu_active;
1 jermar 139
 
140
    spinlock_lock(&cpu->lock);
10 jermar 141
    if ((++cpu->nrdy) > avg) {
7 jermar 142
        /*
143
         * If there are idle halted CPU's, this will wake them up.
144
         */
8 jermar 145
        ipi_broadcast(VECTOR_WAKEUP_IPI);
7 jermar 146
    }  
1 jermar 147
    spinlock_unlock(&cpu->lock);
125 jermar 148
 
413 jermar 149
    interrupts_restore(ipl);
1 jermar 150
}
151
 
107 decky 152
 
153
/** Create new thread
154
 *
155
 * Create a new thread.
156
 *
157
 * @param func  Thread's implementing function.
158
 * @param arg   Thread's implementing function argument.
159
 * @param task  Task to which the thread belongs.
160
 * @param flags Thread flags.
161
 *
162
 * @return New thread's structure on success, NULL on failure.
163
 *
164
 */
1 jermar 165
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
166
{
167
    thread_t *t;
168
    __address frame_ks, frame_us = NULL;
169
 
170
    t = (thread_t *) malloc(sizeof(thread_t));
171
    if (t) {
413 jermar 172
        ipl_t ipl;
1 jermar 173
 
552 palkovsky 174
        spinlock_initialize(&t->lock, "thread_t_lock");
1 jermar 175
 
548 jermar 176
        frame_ks = frame_alloc(FRAME_KA, ONE_FRAME);
1 jermar 177
        if (THREAD_USER_STACK & flags) {
548 jermar 178
            frame_us = frame_alloc(FRAME_KA, ONE_FRAME);
1 jermar 179
        }
180
 
413 jermar 181
        ipl = interrupts_disable();
1 jermar 182
        spinlock_lock(&tidlock);
183
        t->tid = ++last_tid;
184
        spinlock_unlock(&tidlock);
413 jermar 185
        interrupts_restore(ipl);
210 decky 186
 
1 jermar 187
        memsetb(frame_ks, THREAD_STACK_SIZE, 0);
188
        link_initialize(&t->rq_link);
189
        link_initialize(&t->wq_link);
190
        link_initialize(&t->th_link);
191
        link_initialize(&t->threads_link);
192
        t->kstack = (__u8 *) frame_ks;
193
        t->ustack = (__u8 *) frame_us;
194
 
195
        context_save(&t->saved_context);
414 jermar 196
        context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
184 jermar 197
 
198
        the_initialize((the_t *) t->kstack);
1 jermar 199
 
413 jermar 200
        ipl = interrupts_disable();
201
        t->saved_context.ipl = interrupts_read();
202
        interrupts_restore(ipl);
1 jermar 203
 
204
        t->thread_code = func;
205
        t->thread_arg = arg;
206
        t->ticks = -1;
413 jermar 207
        t->priority = -1;       /* start in rq[0] */
1 jermar 208
        t->cpu = NULL;
209
        t->flags = 0;
210
        t->state = Entering;
211
        t->call_me = NULL;
212
        t->call_me_with = NULL;
213
 
214
        timeout_initialize(&t->sleep_timeout);
215
        t->sleep_queue = NULL;
216
        t->timeout_pending = 0;
217
 
218
        t->rwlock_holder_type = RWLOCK_NONE;
219
 
220
        t->task = task;
221
 
73 vana 222
        t->fpu_context_exists=0;
223
        t->fpu_context_engaged=0;
224
 
1 jermar 225
        /*
226
         * Register this thread in the system-wide list.
227
         */
413 jermar 228
        ipl = interrupts_disable();    
1 jermar 229
        spinlock_lock(&threads_lock);
230
        list_append(&t->threads_link, &threads_head);
231
        spinlock_unlock(&threads_lock);
232
 
233
        /*
234
         * Attach to the containing task.
235
         */
236
        spinlock_lock(&task->lock);
237
        list_append(&t->th_link, &task->th_head);
238
        spinlock_unlock(&task->lock);
239
 
413 jermar 240
        interrupts_restore(ipl);
1 jermar 241
    }
242
 
243
    return t;
244
}
245
 
107 decky 246
 
247
/** Make thread exiting
248
 *
249
 * End current thread execution and switch it to the exiting
250
 * state. All pending timeouts are executed.
251
 *
252
 */
1 jermar 253
void thread_exit(void)
254
{
413 jermar 255
    ipl_t ipl;
1 jermar 256
 
257
restart:
413 jermar 258
    ipl = interrupts_disable();
15 jermar 259
    spinlock_lock(&THREAD->lock);
260
    if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
261
        spinlock_unlock(&THREAD->lock);
413 jermar 262
        interrupts_restore(ipl);
1 jermar 263
        goto restart;
264
    }
15 jermar 265
    THREAD->state = Exiting;
266
    spinlock_unlock(&THREAD->lock);
1 jermar 267
    scheduler();
268
}
269
 
107 decky 270
 
271
/** Thread sleep
272
 *
273
 * Suspend execution of the current thread.
274
 *
275
 * @param sec Number of seconds to sleep.
276
 *
277
 */
1 jermar 278
void thread_sleep(__u32 sec)
279
{
125 jermar 280
    thread_usleep(sec*1000000);
1 jermar 281
}
107 decky 282
 
283
 
284
/** Thread usleep
285
 *
286
 * Suspend execution of the current thread.
287
 *
288
 * @param usec Number of microseconds to sleep.
289
 *
290
 */
1 jermar 291
void thread_usleep(__u32 usec)
292
{
293
    waitq_t wq;
294
 
295
    waitq_initialize(&wq);
296
 
297
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
298
}
299
 
107 decky 300
 
301
/** Register thread out-of-context invocation
302
 *
303
 * Register a function and its argument to be executed
304
 * on next context switch to the current thread.
305
 *
306
 * @param call_me      Out-of-context function.
307
 * @param call_me_with Out-of-context function argument.
308
 *
309
 */
1 jermar 310
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
311
{
413 jermar 312
    ipl_t ipl;
1 jermar 313
 
413 jermar 314
    ipl = interrupts_disable();
15 jermar 315
    spinlock_lock(&THREAD->lock);
316
    THREAD->call_me = call_me;
317
    THREAD->call_me_with = call_me_with;
318
    spinlock_unlock(&THREAD->lock);
413 jermar 319
    interrupts_restore(ipl);
1 jermar 320
}