xref: /freebsd-10.2-release/sys/x86/isa/icu.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)icu.h	5.6 (Berkeley) 5/9/91
 * $FreeBSD: head/sys/i386/isa/icu.h 76645 2001-05-15 23:11:48Z jhb $
 */

/*
 * AT/386 Interrupt Control constants
 * W. Jolitz 8/89
 */

#ifndef _I386_ISA_ICU_H_
#define	_I386_ISA_ICU_H_

#ifndef	LOCORE

/*
#define MP_SAFE
 * Note:
 *	Most of the SMP equivilants of the icu macros are coded
 *	elsewhere in an MP-safe fashion.
 *	In particular note that the 'imen' variable is opaque.
 *	DO NOT access imen directly, use INTREN()/INTRDIS().
 */

void	INTREN			__P((u_int));
void	INTRDIS			__P((u_int));

#ifdef APIC_IO
extern	unsigned apic_imen;	/* APIC interrupt mask enable */
#define APIC_IMEN_BITS	32	/* number of bits in apic_imen */
#else
extern	unsigned imen;		/* interrupt mask enable */
#define IMEN_BITS	16	/* number of bits in imen */
#endif

#endif /* LOCORE */


#ifdef APIC_IO
/*
 * Note: The APIC uses different values for IRQxxx.
 *	 Unfortunately many drivers use the 8259 values as indexes
 *	 into tables, etc.  The APIC equivilants are kept as APIC_IRQxxx.
 *	 The 8259 versions have to be used in SMP for legacy operation
 *	 of the drivers.
 */
#endif /* APIC_IO */

/*
 * Interrupt enable bits - in normal order of priority (which we change)
 */
#define	IRQ0		0x0001		/* highest priority - timer */
#define	IRQ1		0x0002
#define	IRQ_SLAVE	0x0004
#define	IRQ8		0x0100
#define	IRQ9		0x0200
#define	IRQ2		IRQ9
#define	IRQ10		0x0400
#define	IRQ11		0x0800
#define	IRQ12		0x1000
#define	IRQ13		0x2000
#define	IRQ14		0x4000
#define	IRQ15		0x8000
#define	IRQ3		0x0008		/* this is highest after rotation */
#define	IRQ4		0x0010
#define	IRQ5		0x0020
#define	IRQ6		0x0040
#define	IRQ7		0x0080		/* lowest - parallel printer */

#ifdef PC98
#undef	IRQ2
#define IRQ2		0x0004
#undef	IRQ_SLAVE
#define	IRQ_SLAVE	0x0080
#endif


/*
 * Interrupt Control offset into Interrupt descriptor table (IDT)
 */
#define	ICU_OFFSET	32		/* 0-31 are processor exceptions */

#ifdef APIC_IO

/* 32-47: ISA IRQ0-IRQ15, 48-55: IO APIC IRQ16-IRQ31 */
#define	ICU_LEN		32
#define	HWI_MASK	0xffffffff	/* bits for h/w interrupts */

#else

#define	ICU_LEN		16		/* 32-47 are ISA interrupts */
#define	HWI_MASK	0xffff		/* bits for h/w interrupts */

#endif /* APIC_IO */

#endif /* !_I386_ISA_ICU_H_ */