1 // SPDX-License-Identifier: GPL-2.0
30  * present in the majority of PC/AT boxes.
50  * Not all IRQs can be routed through the IO-APIC, eg. on certain (older)
51  * boards the timer interrupt is not really connected to any IO-APIC pin,
54  * Any '1' bit in this mask means the IRQ is routed through the IO-APIC.
76 	mask_8259A_irq(data->irq);  in disable_8259A_irq()
95 	unmask_8259A_irq(data->irq);  in enable_8259A_irq()
155 	unsigned int irq = data->irq;  in mask_and_ack_8259A()
162 	 * to overdo spurious IRQ handling - it's usually a sign  in mask_and_ack_8259A()
167 	 * usually resulting from the 8259A-1|2 PICs) occur  in mask_and_ack_8259A()
181 		inb(PIC_SLAVE_IMR);	/* DUMMY - (do we need this?) */  in mask_and_ack_8259A()
185 		 /* 'Specific EOI' to master-IRQ2 */  in mask_and_ack_8259A()
188 		inb(PIC_MASTER_IMR);	/* DUMMY - (do we need this?) */  in mask_and_ack_8259A()
197 	 * this is the slow path - should happen rarely.  in mask_and_ack_8259A()
202 		 * 8259A - not spurious, go handle it.  in mask_and_ack_8259A()
210 		 * lets ACK and report it. [once per IRQ]  in mask_and_ack_8259A()
228 	.name		= "XT-PIC",
268 	outb(0xff, PIC_MASTER_IMR);	/* mask all of 8259A-1 */  in i8259A_shutdown()
269 	outb(0xff, PIC_SLAVE_IMR);	/* mask all of 8259A-2 */  in i8259A_shutdown()
284 	outb(0xff, PIC_MASTER_IMR);	/* mask all of 8259A-1 */  in mask_8259A()
285 	outb(0xff, PIC_SLAVE_IMR);	/* mask all of 8259A-2 */  in mask_8259A()
317 	 * there and let legacy_pic->init() initialize it for nothing.  in probe_8259A()
333 	outb(0xff, PIC_SLAVE_IMR);	/* mask all of 8259A-2 */  in probe_8259A()
353 	outb(0xff, PIC_MASTER_IMR);	/* mask all of 8259A-1 */  in init_8259A()
356 	 * outb_pic - this has to work on a wide range of PC hardware.  in init_8259A()
358 	outb_pic(0x11, PIC_MASTER_CMD);	/* ICW1: select 8259A-1 init */  in init_8259A()
360 	/* ICW2: 8259A-1 IR0-7 mapped to ISA_IRQ_VECTOR(0) */  in init_8259A()
363 	/* 8259A-1 (the master) has a slave on IR2 */  in init_8259A()
371 	outb_pic(0x11, PIC_SLAVE_CMD);	/* ICW1: select 8259A-2 init */  in init_8259A()
373 	/* ICW2: 8259A-2 IR0-7 mapped to ISA_IRQ_VECTOR(8) */  in init_8259A()
375 	/* 8259A-2 is a slave on master's IR2 */  in init_8259A()
399  * is to make x86 binary compatible among pc compatible and non-pc compatible