1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
29  * PIC driver for the 8259A Master and Slave PICs in PC/AT machines.
47 #include <machine/frame.h>
66 #define	MASTER	0  macro
69 #define	IMEN_MASK(ai)		(IRQ_MASK((ai)->at_irq))
93 #define	IRQ(ap, ai)	((ap)->at_irqbase + (ai)->at_irq)
185 	KASSERT(isrc->is_pic == &atpics[MASTER].at_pic,  in _atpic_eoi_master()
188 	outb(atpics[MASTER].at_ioaddr, OCW2_EOI);  in _atpic_eoi_master()
193  * The data sheet says no auto-EOI on slave, but it sometimes works.
200 	KASSERT(isrc->is_pic == &atpics[SLAVE].at_pic,  in _atpic_eoi_slave()
205 	outb(atpics[MASTER].at_ioaddr, OCW2_EOI);  in _atpic_eoi_slave()
228 	 * To avoid the slave not register sources after the master  in atpic_register_sources()
230 	 * called on the master.  in atpic_register_sources()
232 	if (ap != &atpics[MASTER])  in atpic_register_sources()
242 		intr_register_source(&ai->at_intsrc);  in atpic_register_sources()
250 	struct atpic *ap = (struct atpic *)isrc->is_pic;  in atpic_enable_source()
253 	if (ap->at_imen & IMEN_MASK(ai)) {  in atpic_enable_source()
254 		ap->at_imen &= ~IMEN_MASK(ai);  in atpic_enable_source()
255 		outb(ap->at_ioaddr + ICU_IMR_OFFSET, ap->at_imen);  in atpic_enable_source()
264 	struct atpic *ap = (struct atpic *)isrc->is_pic;  in atpic_disable_source()
267 	if (ai->at_trigger != INTR_TRIGGER_EDGE) {  in atpic_disable_source()
268 		ap->at_imen |= IMEN_MASK(ai);  in atpic_disable_source()
269 		outb(ap->at_ioaddr + ICU_IMR_OFFSET, ap->at_imen);  in atpic_disable_source()
278 		if (isrc->is_pic == &atpics[MASTER].at_pic)  in atpic_disable_source()
321 	struct atpic *ap = (struct atpic *)isrc->is_pic;  in atpic_vector()
330 	struct atpic *ap = (struct atpic *)isrc->is_pic;  in atpic_source_pending()
332 	return (inb(ap->at_ioaddr) & IMEN_MASK(ai));  in atpic_source_pending()
368 	if (ai->at_trigger == trig)  in atpic_config_intr()
396 	ai->at_trigger = trig;  in atpic_config_intr()
419 	outb(pic->at_ioaddr, ICW1_RESET | ICW1_IC4);  in i8259_init()
420 	imr_addr = pic->at_ioaddr + ICU_IMR_OFFSET;  in i8259_init()
423 	outb(imr_addr, pic->at_intbase);  in i8259_init()
426 	 * Setup slave links.  For the master pic, indicate what line  in i8259_init()
428 	 * which line on the master we are connected to.  in i8259_init()
442 	outb(imr_addr, pic->at_imen);  in i8259_init()
445 	outb(pic->at_ioaddr, OCW3_SEL | OCW3_RR);  in i8259_init()
447 	/* OCW2_L1 sets priority order to 3-7, 0-2 (com2 first). */  in i8259_init()
449 		outb(pic->at_ioaddr, OCW2_R | OCW2_SL | OCW2_L1);  in i8259_init()
461 	i8259_init(&atpics[MASTER], 0);  in atpic_startup()
465 	/* Install low-level interrupt handlers for all of our IRQs. */  in atpic_startup()
469 		ai->at_intsrc.is_count = &ai->at_count;  in atpic_startup()
470 		ai->at_intsrc.is_straycount = &ai->at_straycount;  in atpic_startup()
471 		setidt(((struct atpic *)ai->at_intsrc.is_pic)->at_intbase +  in atpic_startup()
472 		    ai->at_irq, pti ? ai->at_intr_pti : ai->at_intr, SDT_ATPIC,  in atpic_startup()
489 			ai->at_trigger = elcr_read_trigger(i);  in atpic_startup()
498 				ai->at_trigger = INTR_TRIGGER_EDGE;  in atpic_startup()
501 				ai->at_trigger = INTR_TRIGGER_LEVEL;  in atpic_startup()
525 atpic_handle_intr(u_int vector, struct trapframe *frame)  in atpic_handle_intr()  argument
529 	kasan_mark(frame, sizeof(*frame), sizeof(*frame), 0);  in atpic_handle_intr()
530 	kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED);  in atpic_handle_intr()
540 	if (isrc->is_event == NULL && (vector == 7 || vector == 15)) {  in atpic_handle_intr()
547 		port = ((struct atpic *)isrc->is_pic)->at_ioaddr;  in atpic_handle_intr()
556 	intr_execute_handlers(isrc, frame);  in atpic_handle_intr()