Home | History | Annotate | Line # | Download | only in include
i8259.h revision 1.3 
      1 /*	$NetBSD: i8259.h,v 1.3 2003/05/04 22:01:56 fvdl Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	@(#)icu.h	5.6 (Berkeley) 5/9/91
     39  */
     40 
     41 #ifndef	_X86_I8259_H_
     42 #define	_X86_I8259_H_
     43 
     44 #include <dev/isa/isareg.h>
     45 
     46 #ifndef	_LOCORE
     47 
     48 /*
     49  * Interrupt "level" mechanism variables, masks, and macros
     50  */
     51 extern	unsigned i8259_imen;		/* interrupt mask enable */
     52 extern unsigned i8259_setmask(unsigned);
     53 
     54 #define SET_ICUS()	(outb(IO_ICU1 + 1, imen), outb(IO_ICU2 + 1, imen >> 8))
     55 
     56 extern void i8259_default_setup(void);
     57 extern void i8259_reinit(void);
     58 
     59 #endif /* !_LOCORE */
     60 
     61 /*
     62  * Interrupt enable bits -- in order of priority
     63  */
     64 #define	IRQ_SLAVE	2
     65 
     66 /*
     67  * Interrupt Control offset into Interrupt descriptor table (IDT)
     68  */
     69 #define	ICU_OFFSET	32		/* 0-31 are processor exceptions */
     70 #define	ICU_LEN		16		/* 32-47 are ISA interrupts */
     71 
     72 
     73 #define ICU_HARDWARE_MASK
     74 
     75 /*
     76  * These macros are fairly self explanatory.  If ICU_SPECIAL_MASK_MODE is
     77  * defined, we try to take advantage of the ICU's `special mask mode' by only
     78  * EOIing the interrupts on return.  This avoids the requirement of masking and
     79  * unmasking.  We can't do this without special mask mode, because the ICU
     80  * would also hold interrupts that it thinks are of lower priority.
     81  *
     82  * Many machines do not support special mask mode, so by default we don't try
     83  * to use it.
     84  */
     85 
     86 #define	IRQ_BIT(num)	(1 << ((num) % 8))
     87 #define	IRQ_BYTE(num)	((num) >> 3)
     88 
     89 #define i8259_late_ack(num)
     90 
     91 #ifdef ICU_SPECIAL_MASK_MODE
     92 
     93 #define	i8259_asm_ack1(num)
     94 #define	i8259_asm_ack2(num) \
     95 	movb	$(0x60|IRQ_SLAVE),%al	/* specific EOI for IRQ2 */	;\
     96 	outb	%al,$IO_ICU1
     97 #define	i8259_asm_mask(num)
     98 #define	i8259_asm_unmask(num) \
     99 	movb	$(0x60|(num%8)),%al	/* specific EOI */		;\
    100 	outb	%al,$ICUADDR
    101 
    102 #else /* ICU_SPECIAL_MASK_MODE */
    103 
    104 #ifndef	AUTO_EOI_1
    105 #define	i8259_asm_ack1(num) \
    106 	movb	$(0x60|(num%8)),%al	/* specific EOI */		;\
    107 	outb	%al,$IO_ICU1
    108 #else
    109 #define	i8259_asm_ack1(num)
    110 #endif
    111 
    112 #ifndef AUTO_EOI_2
    113 #define	i8259_asm_ack2(num) \
    114 	movb	$(0x60|(num%8)),%al	/* specific EOI */		;\
    115 	outb	%al,$IO_ICU2		/* do the second ICU first */	;\
    116 	movb	$(0x60|IRQ_SLAVE),%al	/* specific EOI for IRQ2 */	;\
    117 	outb	%al,$IO_ICU1
    118 #else
    119 #define	i8259_asm_ack2(num)
    120 #endif
    121 
    122 #ifdef PIC_MASKDELAY
    123 #define MASKDELAY	pushl %eax ; inb $0x84,%al ; popl %eax
    124 #else
    125 #define MASKDELAY
    126 #endif
    127 
    128 #ifdef ICU_HARDWARE_MASK
    129 
    130 #define	i8259_asm_mask(num) \
    131 	movb	CVAROFF(i8259_imen, IRQ_BYTE(num)),%al			;\
    132 	orb	$IRQ_BIT(num),%al					;\
    133 	movb	%al,CVAROFF(i8259_imen, IRQ_BYTE(num))			;\
    134 	MASKDELAY							;\
    135 	outb	%al,$(ICUADDR+1)
    136 #define	i8259_asm_unmask(num) \
    137 	movb	CVAROFF(i8259_imen, IRQ_BYTE(num)),%al			;\
    138 	andb	$~IRQ_BIT(num),%al					;\
    139 	movb	%al,CVAROFF(i8259_imen, IRQ_BYTE(num))			;\
    140 	MASKDELAY							;\
    141 	outb	%al,$(ICUADDR+1)
    142 
    143 #else /* ICU_HARDWARE_MASK */
    144 
    145 #define	i8259_asm_mask(num)
    146 #define	i8259_asm_unmask(num)
    147 
    148 #endif /* ICU_HARDWARE_MASK */
    149 #endif /* ICU_SPECIAL_MASK_MODE */
    150 
    151 #endif /* !_X86_I8259_H_ */
    152