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/* $OpenBSD: i8259.h,v 1.4 2006/04/14 22:26:46 weingart Exp $ */
/* $NetBSD: i8259.h,v 1.3 2003/05/04 22:01:56 fvdl Exp $ */
/*-
* 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. 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.
*
* @(#)icu.h 5.6 (Berkeley) 5/9/91
*/
#ifndef _I386_I8259_H_
#define _I386_I8259_H_
#include <dev/isa/isareg.h>
#ifndef _LOCORE
/*
* Interrupt "level" mechanism variables, masks, and macros
*/
extern unsigned imen; /* interrupt mask enable */
extern unsigned i8259_setmask(unsigned);
#define SET_ICUS() (outb(IO_ICU1 + 1, imen), outb(IO_ICU2 + 1, imen >> 8))
extern void i8259_default_setup(void);
extern void i8259_reinit(void);
#endif /* !_LOCORE */
/*
* Interrupt enable bits -- in order of priority
*/
#define IRQ_SLAVE 2
/*
* Interrupt Control offset into Interrupt descriptor table (IDT)
*/
#define ICU_OFFSET 32 /* 0-31 are processor exceptions */
#define ICU_LEN 16 /* 32-47 are ISA interrupts */
#define ICU_HARDWARE_MASK
/*
* These macros are fairly self explanatory. If ICU_SPECIAL_MASK_MODE is
* defined, we try to take advantage of the ICU's `special mask mode' by only
* EOIing the interrupts on return. This avoids the requirement of masking and
* unmasking. We can't do this without special mask mode, because the ICU
* would also hold interrupts that it thinks are of lower priority.
*
* Many machines do not support special mask mode, so by default we don't try
* to use it.
*/
#define IRQ_BIT(num) (1 << ((num) % 8))
#define IRQ_BYTE(num) ((num) >> 3)
#define i8259_late_ack(num)
#ifdef ICU_SPECIAL_MASK_MODE
#define i8259_asm_ack1(num)
#define i8259_asm_ack2(num) \
movb $(0x60|IRQ_SLAVE),%al /* specific EOI for IRQ2 */ ;\
outb %al,$IO_ICU1
#define i8259_asm_mask(num)
#define i8259_asm_unmask(num) \
movb $(0x60|(num%8)),%al /* specific EOI */ ;\
outb %al,$ICUADDR
#else /* ICU_SPECIAL_MASK_MODE */
#ifndef AUTO_EOI_1
#define i8259_asm_ack1(num) \
movb $(0x60|(num%8)),%al /* specific EOI */ ;\
outb %al,$IO_ICU1
#else
#define i8259_asm_ack1(num)
#endif
#ifndef AUTO_EOI_2
#define i8259_asm_ack2(num) \
movb $(0x60|(num%8)),%al /* specific EOI */ ;\
outb %al,$IO_ICU2 /* do the second ICU first */ ;\
movb $(0x60|IRQ_SLAVE),%al /* specific EOI for IRQ2 */ ;\
outb %al,$IO_ICU1
#else
#define i8259_asm_ack2(num)
#endif
#ifdef ICU_HARDWARE_MASK
#define i8259_asm_mask(num) \
movb CVAROFF(imen, IRQ_BYTE(num)),%al ;\
orb $IRQ_BIT(num),%al ;\
movb %al,CVAROFF(imen, IRQ_BYTE(num)) ;\
pushl %eax ;\
inb $0x84,%al ;\
popl %eax ;\
outb %al,$(ICUADDR+1)
#define i8259_asm_unmask(num) \
cli ;\
movb CVAROFF(imen, IRQ_BYTE(num)),%al ;\
andb $~IRQ_BIT(num),%al ;\
movb %al,CVAROFF(imen, IRQ_BYTE(num)) ;\
pushl %eax ;\
inb $0x84,%al ;\
popl %eax ;\
outb %al,$(ICUADDR+1) ;\
sti
#else /* ICU_HARDWARE_MASK */
#define i8259_asm_mask(num)
#define i8259_asm_unmask(num)
#endif /* ICU_HARDWARE_MASK */
#endif /* ICU_SPECIAL_MASK_MODE */
#endif /* !_X86_I8259_H_ */
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