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/*
* Copyright (c) 2012 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <kern/error.h>
#include <kern/init.h>
#include <kern/kmem.h>
#include <kern/list.h>
#include <kern/macros.h>
#include <kern/param.h>
#include <kern/stddef.h>
#include <kern/string.h>
#include <kern/thread.h>
#include <machine/cpu.h>
#include <machine/tcb.h>
/*
* Make sure thread stacks are properly aligned.
*/
#define THREAD_STACK_ALIGN 8
/*
* Per processor run queue.
*/
struct thread_runq {
struct list threads;
} __aligned(CPU_L1_SIZE);
/*
* Per-processor run queues.
*/
static struct thread_runq thread_runqs[MAX_CPUS];
/*
* Caches for allocated threads and their stacks.
*/
static struct kmem_cache thread_cache;
static struct kmem_cache thread_stack_cache;
static void __init
thread_runq_init(struct thread_runq *runq)
{
list_init(&runq->threads);
}
void __init
thread_setup(void)
{
size_t i;
tcb_setup();
kmem_cache_init(&thread_cache, "thread", sizeof(struct thread),
0, NULL, NULL, NULL, 0);
kmem_cache_init(&thread_stack_cache, "thread_stack", STACK_SIZE,
THREAD_STACK_ALIGN, NULL, NULL, NULL, 0);
for (i = 0; i < ARRAY_SIZE(thread_runqs); i++)
thread_runq_init(&thread_runqs[i]);
}
int
thread_create(struct thread **threadp, const char *name, struct task *task,
thread_run_fn_t run_fn, void *arg)
{
struct thread *thread;
struct tcb *tcb;
void *stack;
int error;
thread = kmem_cache_alloc(&thread_cache);
if (thread == NULL) {
error = ERROR_NOMEM;
goto error_thread;
}
stack = kmem_cache_alloc(&thread_stack_cache);
if (stack == NULL) {
error = ERROR_NOMEM;
goto error_stack;
}
error = tcb_create(&tcb, stack, thread);
if (error)
goto error_tcb;
if (name == NULL)
name = task->name;
/* XXX Assign all threads to the main processor for now */
thread->tcb = tcb;
list_insert_tail(&thread_runqs[0].threads, &thread->runq_node);
task_add_thread(task, thread);
thread->task = task;
thread->stack = stack;
strlcpy(thread->name, name, sizeof(thread->name));
thread->run_fn = run_fn;
thread->arg = arg;
*threadp = thread;
return 0;
error_tcb:
kmem_cache_free(&thread_stack_cache, stack);
error_stack:
kmem_cache_free(&thread_cache, thread);
error_thread:
return error;
}
void __init
thread_load(struct thread *thread)
{
tcb_load(thread->tcb);
}
void
thread_main(struct thread *thread)
{
thread->run_fn(thread->arg);
for (;;)
cpu_idle();
}
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