2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1990 The Regents of the University of California.
7 * This code is derived from software contributed to Berkeley by
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34 * from: @(#)icu.h 5.6 (Berkeley) 5/9/91
39 * AT/386 Interrupt Control constants
43 #ifndef _X86_ISA_ICU_H_
44 #define _X86_ISA_ICU_H_
46 #define ICU_IMR_OFFSET 1
49 * PC-AT machines wire the slave PIC to pin 2 on the master PIC.
54 * Determine the base master and slave modes not including auto EOI support.
55 * All machines that FreeBSD supports use 8086 mode.
57 #define BASE_MASTER_MODE ICW4_8086
58 #define BASE_SLAVE_MODE ICW4_8086
60 /* Enable automatic EOI if requested. */
62 #define MASTER_MODE (BASE_MASTER_MODE | ICW4_AEOI)
64 #define MASTER_MODE BASE_MASTER_MODE
67 #define SLAVE_MODE (BASE_SLAVE_MODE | ICW4_AEOI)
69 #define SLAVE_MODE BASE_SLAVE_MODE
72 #define IRQ_MASK(irq) (1 << (irq))
73 #define IMEN_MASK(ai) (IRQ_MASK((ai)->at_irq))
75 void atpic_handle_intr(u_int vector, struct trapframe *frame);
76 void atpic_startup(void);
78 #endif /* !_X86_ISA_ICU_H_ */