sched: add task and thread alloc functions

sched/task.c

@@ -0,0 +1,73 @@
+#include <socks/locks.h>
+#include <socks/sched.h>
+#include <socks/object.h>
+#include <socks/libc/stdio.h>
+
+static object_type_t task_type = {
+	.ob_name = "task",
+	.ob_size = sizeof(task_t),
+};
+
+static task_t *kernel_task;
+
+static spin_lock_t task_list_lock;
+static btree_t task_list;
+
+BTREE_DEFINE_SIMPLE_GET(task_t, unsigned int, t_tasklist, t_id, task_list_get)
+BTREE_DEFINE_SIMPLE_INSERT(task_t, t_tasklist, t_id, task_list_insert)
+
+kern_status_t setup_kernel_task(void)
+{
+	kernel_task = task_alloc();
+	if (!kernel_task) {
+		return KERN_NO_MEMORY;
+	}
+
+	kernel_task->t_id = 0;
+	kernel_task->t_pmap = get_kernel_pmap();
+	kernel_task->t_state = TASK_RUNNING;
+
+	snprintf(kernel_task->t_name, sizeof kernel_task->t_name, "kernel_task");
+
+	thread_t *kernel_thread = thread_alloc();
+	kernel_thread->tr_id = 0;
+	kernel_thread->tr_prio = PRIO_NORMAL;
+	kernel_thread->tr_state = THREAD_READY;
+
+	unsigned long flags;
+	task_lock_irqsave(kernel_task, &flags);
+	queue_push_back(&kernel_task->t_threads, &kernel_thread->tr_threads);
+	task_unlock_irqrestore(kernel_task, flags);
+
+	spin_lock_irqsave(&task_list_lock, &flags);
+	task_list_insert(&task_list, kernel_task);
+	spin_unlock_irqrestore(&task_list_lock, flags);
+
+	return KERN_OK;
+}
+
+kern_status_t task_object_type_init(void)
+{
+	return object_type_register(&task_type);
+}
+
+task_t *task_alloc(void)
+{
+	object_t *task_obj = object_create(&task_type);
+	if (!task_obj) {
+		return NULL;
+	}
+	
+	task_t *t = object_data(task_obj);
+	memset(t, 0x00, sizeof *t);
+	return t;
+}
+
+task_t *task_from_pid(unsigned int pid)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&task_list_lock, &flags);
+	task_t *t = task_list_get(&task_list, pid);
+	spin_unlock_irqrestore(&task_list_lock, flags);
+	return t;
+}