/*
* load_context:
*
* Start the first thread on a processor.
*/
static void
load_context(
thread_t thread)
{
processor_t processor = current_processor();
#define load_context_kprintf(x...) /* kprintf("load_context: " x) */
load_context_kprintf("calling machine_set_current_thread\n");
machine_set_current_thread(thread);
load_context_kprintf("calling processor_up\n");
processor_up(processor);
PMAP_ACTIVATE_KERNEL(processor->cpu_id);
/*
* Acquire a stack if none attached. The panic
* should never occur since the thread is expected
* to have reserved stack.
*/
load_context_kprintf("thread %p, stack %lx, stackptr %lx\n", thread,
thread->kernel_stack, thread->machine.kstackptr);
if (!thread->kernel_stack) {
load_context_kprintf("calling stack_alloc_try\n");
if (!stack_alloc_try(thread))
panic("load_context");
}
/*
* The idle processor threads are not counted as
* running for load calculations.
*/
if (!(thread->state & TH_IDLE))
sched_run_incr();
processor->active_thread = thread;
processor->current_pri = thread->sched_pri;
processor->current_thmode = thread->sched_mode;
processor->deadline = UINT64_MAX;
thread->last_processor = processor;
processor->last_dispatch = mach_absolute_time();
timer_start(&thread->system_timer, processor->last_dispatch);
PROCESSOR_DATA(processor, thread_timer) = PROCESSOR_DATA(processor, kernel_timer) = &thread->system_timer;
timer_start(&PROCESSOR_DATA(processor, system_state), processor->last_dispatch);
PROCESSOR_DATA(processor, current_state) = &PROCESSOR_DATA(processor, system_state);
PMAP_ACTIVATE_USER(thread, processor->cpu_id);
load_context_kprintf("calling machine_load_context\n");
machine_load_context(thread);
/*NOTREACHED*/
}
/*
* Start up the first thread on a CPU.
* First thread is specified for the master CPU.
*/
void
cpu_launch_first_thread(
register thread_t th)
{
register int mycpu;
mycpu = cpu_number();
#if MACH_ASSERT
if (watchacts & WA_BOOT)
printf("cpu_launch_first_thread(%x) cpu=%d\n", th, mycpu);
#endif /* MACH_ASSERT */
cpu_up(mycpu);
start_timer(&kernel_timer[mycpu]);
/*
* Block all interrupts for choose_thread.
*/
(void) splhigh();
if (th == THREAD_NULL) {
th = cpu_to_processor(mycpu)->idle_thread;
if (th == THREAD_NULL || !rem_runq(th))
panic("cpu_launch_first_thread");
}
rtclock_reset(); /* start realtime clock ticking */
PMAP_ACTIVATE_KERNEL(mycpu);
thread_machine_set_current(th);
thread_lock(th);
th->state &= ~TH_UNINT;
thread_unlock(th);
timer_switch(&th->system_timer);
PMAP_ACTIVATE_USER(th->top_act, mycpu);
assert(mycpu == cpu_number());
/* The following is necessary to keep things balanced */
disable_preemption();
load_context(th);
/*NOTREACHED*/
}
