133     kdebug("init proc's preempt_count=%ld", current_pcb->preempt_count);  in smp_init()
156     memset(current_pcb, 0, sizeof(struct process_control_block));  in smp_ap_start()
159     current_pcb->state = PROC_RUNNING;  in smp_ap_start()
160     current_pcb->flags = PF_KTHREAD;  in smp_ap_start()
161     current_pcb->mm = &initial_mm;  in smp_ap_start()
163     list_init(&current_pcb->list);  in smp_ap_start()
164     current_pcb->addr_limit = KERNEL_BASE_LINEAR_ADDR;  in smp_ap_start()
165     current_pcb->priority = 2;  in smp_ap_start()
166     current_pcb->virtual_runtime = 0;  in smp_ap_start()
168     current_pcb->thread = (struct thread_struct *)(current_pcb + 1); // 将线程结构体放置在pcb后方  in smp_ap_start()
169     current_pcb->thread->rbp = _stack_start;  in smp_ap_start()
170     current_pcb->thread->rsp = _stack_start;  in smp_ap_start()
171     current_pcb->thread->fs = KERNEL_DS;  in smp_ap_start()
172     current_pcb->thread->gs = KERNEL_DS;  in smp_ap_start()
173     current_pcb->cpu_id = current_starting_cpu;  in smp_ap_start()
175     initial_proc[proc_current_cpu_id] = current_pcb;  in smp_ap_start()
178     current_pcb->preempt_count = 0;  in smp_ap_start()