/*
* Disable or enable interrupts and adjust curspl setting. Return old
* spl level.
*/
int
splx(int spl)
{
struct thread *cur = curthread;
int ret;
if (cur->t_curspl < spl) {
/* turning interrupts off */
splraise(cur->t_curspl, spl);
ret = cur->t_curspl;
cur->t_curspl = spl;
}
else if (cur->t_curspl > spl) {
/* turning interrupts on */
ret = cur->t_curspl;
cur->t_curspl = spl;
spllower(ret, spl);
}
else {
/* do nothing */
ret = spl;
}
return ret;
}
/*
* Release the lock.
*/
void
spinlock_release(struct spinlock *lk)
{
/* this must work before curcpu initialization */
if (CURCPU_EXISTS()) {
KASSERT(lk->lk_holder == curcpu->c_self);
}
lk->lk_holder = NULL;
spinlock_data_set(&lk->lk_lock, 0);
spllower(IPL_HIGH, IPL_NONE);
}
