17 static unsigned char cached_8259[2] = { 0xff, 0xff };
18 #define cached_A1 (cached_8259[0])
34 	int lock = 0;  in i8259_irq()
44 		outb(0x0C, 0x20);		/* prepare for poll */  in i8259_irq()
45 		irq = inb(0x20) & 7;  in i8259_irq()
51 			outb(0x0C, 0xA0);	/* prepare for poll */  in i8259_irq()
52 			irq = (inb(0xA0) & 7) + 8;  in i8259_irq()
65 			outb(0x0B, 0x20);	/* ISR register */  in i8259_irq()
66 		if(~inb(0x20) & 0x80)  in i8259_irq()
67 			irq = 0;  in i8259_irq()
68 	} else if (irq == 0xff)  in i8259_irq()
69 		irq = 0;  in i8259_irq()
83 		inb(0xA1); 	/* DUMMY */  in i8259_mask_and_ack_irq()
84 		outb(cached_A1, 0xA1);  in i8259_mask_and_ack_irq()
85 		outb(0x20, 0xA0);	/* Non-specific EOI */  in i8259_mask_and_ack_irq()
86 		outb(0x20, 0x20);	/* Non-specific EOI to cascade */  in i8259_mask_and_ack_irq()
89 		inb(0x21); 	/* DUMMY */  in i8259_mask_and_ack_irq()
90 		outb(cached_21, 0x21);  in i8259_mask_and_ack_irq()
91 		outb(0x20, 0x20);	/* Non-specific EOI */  in i8259_mask_and_ack_irq()
98 	outb(cached_A1,0xA1);  in i8259_set_irq_mask()
99 	outb(cached_21,0x21);  in i8259_set_irq_mask()
142 	.start = 0x20,
143 	.end = 0x21,
149 	.start = 0xa0,
150 	.end = 0xa1,
156 	.start = 0x4d0,
157 	.end = 0x4d1,
171 	pr_debug("i8259_host_map(%d, 0x%lx)\n", virq, hw);  in i8259_host_map()
182 	return 0;  in i8259_host_map()
196 	*out_hwirq = intspec[0];  in i8259_host_xlate()
202 	return 0;  in i8259_host_xlate()
231 	outb(0xff, 0xA1);  in i8259_init()
232 	outb(0xff, 0x21);  in i8259_init()
235 	outb(0x11, 0x20); /* Start init sequence */  in i8259_init()
236 	outb(0x00, 0x21); /* Vector base */  in i8259_init()
237 	outb(0x04, 0x21); /* edge triggered, Cascade (slave) on IRQ2 */  in i8259_init()
238 	outb(0x01, 0x21); /* Select 8086 mode */  in i8259_init()
241 	outb(0x11, 0xA0); /* Start init sequence */  in i8259_init()
242 	outb(0x08, 0xA1); /* Vector base */  in i8259_init()
243 	outb(0x02, 0xA1); /* edge triggered, Cascade (slave) on IRQ2 */  in i8259_init()
244 	outb(0x01, 0xA1); /* Select 8086 mode */  in i8259_init()
250 	outb(0x0B, 0x20);  in i8259_init()
251 	outb(0x0B, 0xA0);  in i8259_init()
257 	outb(cached_A1, 0xA1);  in i8259_init()
258 	outb(cached_21, 0x21);  in i8259_init()
263 	i8259_host = irq_domain_add_legacy(node, NR_IRQS_LEGACY, 0, 0,  in i8259_init()
279 	if (intack_addr != 0)  in i8259_init()