2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
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36 * from: @(#)icu.h 5.6 (Berkeley) 5/9/91
41 * AT/386 Interrupt Control constants
45 #ifndef _I386_ISA_ICU_H_
46 #define _I386_ISA_ICU_H_
53 * Most of the SMP equivilants of the icu macros are coded
54 * elsewhere in an MP-safe fashion.
55 * In particular note that the 'imen' variable is opaque.
56 * DO NOT access imen directly, use INTREN()/INTRDIS().
59 void INTREN __P((u_int));
60 void INTRDIS __P((u_int));
63 extern unsigned apic_imen; /* APIC interrupt mask enable */
64 #define APIC_IMEN_BITS 32 /* number of bits in apic_imen */
66 extern unsigned imen; /* interrupt mask enable */
67 #define IMEN_BITS 16 /* number of bits in imen */
75 * Note: The APIC uses different values for IRQxxx.
76 * Unfortunately many drivers use the 8259 values as indexes
77 * into tables, etc. The APIC equivilants are kept as APIC_IRQxxx.
78 * The 8259 versions have to be used in SMP for legacy operation
84 * Interrupt enable bits - in normal order of priority (which we change)
86 #define IRQ0 0x0001 /* highest priority - timer */
88 #define IRQ_SLAVE 0x0004
98 #define IRQ3 0x0008 /* this is highest after rotation */
102 #define IRQ7 0x0080 /* lowest - parallel printer */
108 #define IRQ_SLAVE 0x0080
113 * Interrupt Control offset into Interrupt descriptor table (IDT)
115 #define ICU_OFFSET 32 /* 0-31 are processor exceptions */
119 /* 32-47: ISA IRQ0-IRQ15, 48-55: IO APIC IRQ16-IRQ31 */
124 #define ICU_LEN 16 /* 32-47 are ISA interrupts */
128 #endif /* !_I386_ISA_ICU_H_ */