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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.
27
 */
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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
 
623 jermar 57
SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
58
link_t threads_head;            /**< List of all threads. */
1 jermar 59
 
623 jermar 60
SPINLOCK_INITIALIZE(tidlock);
1 jermar 61
__u32 last_tid = 0;
62
 
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;
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 */
87
}
88
 
107 decky 89
 
90
/** Initialize threads
91
 *
92
 * Initialize kernel threads support.
93
 *
94
 */
1 jermar 95
void thread_init(void)
96
{
15 jermar 97
    THREAD = NULL;
1 jermar 98
    nrdy = 0;
99
    list_initialize(&threads_head);
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;
7 jermar 115
    int i, avg, send_ipi = 0;
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);
111 palkovsky 139
    avg = nrdy / config.cpu_active;
1 jermar 140
 
141
    spinlock_lock(&cpu->lock);
10 jermar 142
    if ((++cpu->nrdy) > avg) {
7 jermar 143
        /*
144
         * If there are idle halted CPU's, this will wake them up.
145
         */
8 jermar 146
        ipi_broadcast(VECTOR_WAKEUP_IPI);
7 jermar 147
    }  
1 jermar 148
    spinlock_unlock(&cpu->lock);
125 jermar 149
 
413 jermar 150
    interrupts_restore(ipl);
1 jermar 151
}
152
 
107 decky 153
 
154
/** Create new thread
155
 *
156
 * Create a new thread.
157
 *
158
 * @param func  Thread's implementing function.
159
 * @param arg   Thread's implementing function argument.
160
 * @param task  Task to which the thread belongs.
161
 * @param flags Thread flags.
162
 *
163
 * @return New thread's structure on success, NULL on failure.
164
 *
165
 */
1 jermar 166
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
167
{
168
    thread_t *t;
169
    __address frame_ks, frame_us = NULL;
170
 
171
    t = (thread_t *) malloc(sizeof(thread_t));
172
    if (t) {
413 jermar 173
        ipl_t ipl;
1 jermar 174
 
552 palkovsky 175
        spinlock_initialize(&t->lock, "thread_t_lock");
1 jermar 176
 
548 jermar 177
        frame_ks = frame_alloc(FRAME_KA, ONE_FRAME);
1 jermar 178
        if (THREAD_USER_STACK & flags) {
548 jermar 179
            frame_us = frame_alloc(FRAME_KA, ONE_FRAME);
1 jermar 180
        }
181
 
413 jermar 182
        ipl = interrupts_disable();
1 jermar 183
        spinlock_lock(&tidlock);
184
        t->tid = ++last_tid;
185
        spinlock_unlock(&tidlock);
413 jermar 186
        interrupts_restore(ipl);
210 decky 187
 
1 jermar 188
        memsetb(frame_ks, THREAD_STACK_SIZE, 0);
189
        link_initialize(&t->rq_link);
190
        link_initialize(&t->wq_link);
191
        link_initialize(&t->th_link);
192
        link_initialize(&t->threads_link);
193
        t->kstack = (__u8 *) frame_ks;
194
        t->ustack = (__u8 *) frame_us;
195
 
196
        context_save(&t->saved_context);
414 jermar 197
        context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
184 jermar 198
 
199
        the_initialize((the_t *) t->kstack);
1 jermar 200
 
413 jermar 201
        ipl = interrupts_disable();
202
        t->saved_context.ipl = interrupts_read();
203
        interrupts_restore(ipl);
1 jermar 204
 
205
        t->thread_code = func;
206
        t->thread_arg = arg;
207
        t->ticks = -1;
413 jermar 208
        t->priority = -1;       /* start in rq[0] */
1 jermar 209
        t->cpu = NULL;
210
        t->flags = 0;
211
        t->state = Entering;
212
        t->call_me = NULL;
213
        t->call_me_with = NULL;
214
 
215
        timeout_initialize(&t->sleep_timeout);
216
        t->sleep_queue = NULL;
217
        t->timeout_pending = 0;
218
 
219
        t->rwlock_holder_type = RWLOCK_NONE;
220
 
221
        t->task = task;
222
 
73 vana 223
        t->fpu_context_exists=0;
224
        t->fpu_context_engaged=0;
225
 
1 jermar 226
        /*
227
         * Register this thread in the system-wide list.
228
         */
413 jermar 229
        ipl = interrupts_disable();    
1 jermar 230
        spinlock_lock(&threads_lock);
231
        list_append(&t->threads_link, &threads_head);
232
        spinlock_unlock(&threads_lock);
233
 
234
        /*
235
         * Attach to the containing task.
236
         */
237
        spinlock_lock(&task->lock);
238
        list_append(&t->th_link, &task->th_head);
239
        spinlock_unlock(&task->lock);
240
 
413 jermar 241
        interrupts_restore(ipl);
1 jermar 242
    }
243
 
244
    return t;
245
}
246
 
107 decky 247
 
248
/** Make thread exiting
249
 *
250
 * End current thread execution and switch it to the exiting
251
 * state. All pending timeouts are executed.
252
 *
253
 */
1 jermar 254
void thread_exit(void)
255
{
413 jermar 256
    ipl_t ipl;
1 jermar 257
 
258
restart:
413 jermar 259
    ipl = interrupts_disable();
15 jermar 260
    spinlock_lock(&THREAD->lock);
261
    if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
262
        spinlock_unlock(&THREAD->lock);
413 jermar 263
        interrupts_restore(ipl);
1 jermar 264
        goto restart;
265
    }
15 jermar 266
    THREAD->state = Exiting;
267
    spinlock_unlock(&THREAD->lock);
1 jermar 268
    scheduler();
269
}
270
 
107 decky 271
 
272
/** Thread sleep
273
 *
274
 * Suspend execution of the current thread.
275
 *
276
 * @param sec Number of seconds to sleep.
277
 *
278
 */
1 jermar 279
void thread_sleep(__u32 sec)
280
{
125 jermar 281
    thread_usleep(sec*1000000);
1 jermar 282
}
107 decky 283
 
284
 
285
/** Thread usleep
286
 *
287
 * Suspend execution of the current thread.
288
 *
289
 * @param usec Number of microseconds to sleep.
290
 *
291
 */
1 jermar 292
void thread_usleep(__u32 usec)
293
{
294
    waitq_t wq;
295
 
296
    waitq_initialize(&wq);
297
 
298
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
299
}
300
 
107 decky 301
 
302
/** Register thread out-of-context invocation
303
 *
304
 * Register a function and its argument to be executed
305
 * on next context switch to the current thread.
306
 *
307
 * @param call_me      Out-of-context function.
308
 * @param call_me_with Out-of-context function argument.
309
 *
310
 */
1 jermar 311
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
312
{
413 jermar 313
    ipl_t ipl;
1 jermar 314
 
413 jermar 315
    ipl = interrupts_disable();
15 jermar 316
    spinlock_lock(&THREAD->lock);
317
    THREAD->call_me = call_me;
318
    THREAD->call_me_with = call_me_with;
319
    spinlock_unlock(&THREAD->lock);
413 jermar 320
    interrupts_restore(ipl);
1 jermar 321
}