optee thread的初始化

optee os 是支持thread的，thread的初始化主要在下面两个函数中进行
init_runtime->thread_init_boot_thread
void thread_init_boot_thread(void)
{
//得到这个cpu id对应的thread_core_local
    struct thread_core_local *l = thread_get_core_local();
    size_t n;
//可见optee 支持的最多CFG_NUM_THREADS个thread。分别初始化thread的mutexes/sess_stack/pgt_cache
    for (n = 0; n < CFG_NUM_THREADS; n++) {
        TAILQ_INIT(&threads[n].mutexes);
        TAILQ_INIT(&threads[n].tsd.sess_stack);
#ifdef CFG_SMALL_PAGE_USER_TA
        SLIST_INIT(&threads[n].tsd.pgt_cache);
#endif
    }
//将thread_core_local 数组对应curr_thread 赋值为-1
    for (n = 0; n < CFG_TEE_CORE_NB_CORE; n++)
        thread_core_local[n].curr_thread = -1;
//将当前cpu id 对应的curr_thread赋值为0
    l->curr_thread = 0;
    threads[0].state = THREAD_STATE_ACTIVE;
}
struct thread_core_local *thread_get_core_local(void)
{
    uint32_t cpu_id = get_core_pos();

    /*
     * Foreign interrupts must be disabled before playing with core_local
     * since we otherwise may be rescheduled to a different core in the
     * middle of this function.
     */
    assert(thread_get_exceptions() & THREAD_EXCP_FOREIGN_INTR);

    assert(cpu_id < CFG_TEE_CORE_NB_CORE);
    return &thread_core_local[cpu_id];
}
thread_get_core_local 主要是返回cpuid对应的thread_core_local
static struct thread_core_local thread_core_local[CFG_TEE_CORE_NB_CORE];


第二个函数是thread_init_per_cpu
void thread_init_per_cpu(void)
{
    size_t pos = get_core_pos();
    struct thread_core_local *l = thread_get_core_local();

    init_sec_mon(pos);
//设置l->tmp_stack_va_end
    set_tmp_stack(l, GET_STACK(stack_tmp[pos]) - STACK_TMP_OFFS);
    set_abt_stack(l, GET_STACK(stack_abt[pos]));
// 用于将thread_vect_table 保持到vbar_el1 中
    thread_init_vbar();
}
static void set_tmp_stack(struct thread_core_local *l, vaddr_t sp)
{
    /*
     * We're already using the tmp stack when this function is called
     * so there's no need to assign it to any stack pointer. However,
     * we'll need to restore it at different times so store it here.
     */
    l->tmp_stack_va_end = sp;
}


 FUNC thread_init_vbar , :
     adr x0, thread_vect_table
     msr vbar_el1, x0
     ret
 END_FUNC thread_init_vbar