/** Perform sparc64 specific steps before scheduling a thread.
*
* For userspace threads, initialize pointer to the kernel stack and for the
* userspace window buffer.
*/
void before_thread_runs_arch(void)
{
if (THREAD->uspace) {
uint64_t sp = (uintptr_t) THREAD->kstack + STACK_SIZE -
(STACK_BIAS + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT));
asi_u64_write(ASI_SCRATCHPAD, SCRATCHPAD_KSTACK, sp);
asi_u64_write(ASI_SCRATCHPAD, SCRATCHPAD_WBUF,
(uintptr_t) THREAD->arch.uspace_window_buffer);
}
}
/** Process hardware interrupt.
*
* @param n Ignored.
* @param istate Ignored.
*/
void interrupt(unsigned int n, istate_t *istate)
{
uint64_t status = asi_u64_read(ASI_INTR_DISPATCH_STATUS, 0);
if (status & (!INTR_DISPATCH_STATUS_BUSY))
panic("Interrupt Dispatch Status busy bit not set\n");
uint64_t intrcv = asi_u64_read(ASI_INTR_RECEIVE, 0);
#if defined (US)
uint64_t data0 = asi_u64_read(ASI_INTR_R, ASI_UDB_INTR_R_DATA_0);
#elif defined (US3)
uint64_t data0 = asi_u64_read(ASI_INTR_R, VA_INTR_R_DATA_0);
#endif
irq_t *irq = irq_dispatch_and_lock(data0);
if (irq) {
/*
* The IRQ handler was found.
*/
irq->handler(irq);
/*
* See if there is a clear-interrupt-routine and call it.
*/
if (irq->cir)
irq->cir(irq->cir_arg, irq->inr);
irq_spinlock_unlock(&irq->lock, false);
} else if (data0 > config.base) {
/*
* This is a cross-call.
* data0 contains address of the kernel function.
* We call the function only after we verify
* it is one of the supported ones.
*/
#ifdef CONFIG_SMP
if (data0 == (uintptr_t) tlb_shootdown_ipi_recv)
tlb_shootdown_ipi_recv();
#endif
} else {
/*
* Spurious interrupt.
*/
#ifdef CONFIG_DEBUG
log(LF_ARCH, LVL_DEBUG,
"cpu%u: spurious interrupt (intrcv=%#" PRIx64 ", data0=%#"
PRIx64 ")", CPU->id, intrcv, data0);
#else
(void) intrcv;
#endif
}
membar();
asi_u64_write(ASI_INTR_RECEIVE, 0, 0);
}
