1 // SPDX-License-Identifier: GPL-2.0
29  * present in the majority of PC/AT boxes.
49  * Not all IRQs can be routed through the IO-APIC, eg. on certain (older)
50  * boards the timer interrupt is not really connected to any IO-APIC pin,
53  * Any '1' bit in this mask means the IRQ is routed through the IO-APIC.
75 	mask_8259A_irq(data->irq);  in disable_8259A_irq()
94 	unmask_8259A_irq(data->irq);  in enable_8259A_irq()
154 	unsigned int irq = data->irq;  in mask_and_ack_8259A()
161 	 * to overdo spurious IRQ handling - it's usually a sign  in mask_and_ack_8259A()
166 	 * usually resulting from the 8259A-1|2 PICs) occur  in mask_and_ack_8259A()
180 		inb(PIC_SLAVE_IMR);	/* DUMMY - (do we need this?) */  in mask_and_ack_8259A()
184 		 /* 'Specific EOI' to master-IRQ2 */  in mask_and_ack_8259A()
187 		inb(PIC_MASTER_IMR);	/* DUMMY - (do we need this?) */  in mask_and_ack_8259A()
196 	 * this is the slow path - should happen rarely.  in mask_and_ack_8259A()
201 		 * 8259A - not spurious, go handle it.  in mask_and_ack_8259A()
209 		 * lets ACK and report it. [once per IRQ]  in mask_and_ack_8259A()
227 	.name		= "XT-PIC",
267 	outb(0xff, PIC_MASTER_IMR);	/* mask all of 8259A-1 */  in i8259A_shutdown()
268 	outb(0xff, PIC_SLAVE_IMR);	/* mask all of 8259A-2 */  in i8259A_shutdown()
283 	outb(0xff, PIC_MASTER_IMR);	/* mask all of 8259A-1 */  in mask_8259A()
284 	outb(0xff, PIC_SLAVE_IMR);	/* mask all of 8259A-2 */  in mask_8259A()
316 	 * there and let legacy_pic->init() initialize it for nothing.  in probe_8259A()
332 	outb(0xff, PIC_SLAVE_IMR);	/* mask all of 8259A-2 */  in probe_8259A()
352 	outb(0xff, PIC_MASTER_IMR);	/* mask all of 8259A-1 */  in init_8259A()
355 	 * outb_pic - this has to work on a wide range of PC hardware.  in init_8259A()
357 	outb_pic(0x11, PIC_MASTER_CMD);	/* ICW1: select 8259A-1 init */  in init_8259A()
359 	/* ICW2: 8259A-1 IR0-7 mapped to ISA_IRQ_VECTOR(0) */  in init_8259A()
362 	/* 8259A-1 (the master) has a slave on IR2 */  in init_8259A()
370 	outb_pic(0x11, PIC_SLAVE_CMD);	/* ICW1: select 8259A-2 init */  in init_8259A()
372 	/* ICW2: 8259A-2 IR0-7 mapped to ISA_IRQ_VECTOR(8) */  in init_8259A()
374 	/* 8259A-2 is a slave on master's IR2 */  in init_8259A()
398  * is to make x86 binary compatible among pc compatible and non-pc compatible