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/* $NetBSD: i8259.h,v 1.1 2002/11/22 15:23:47 fvdl Exp $ */
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/* $NetBSD: i8259.h,v 1.2 2003/03/02 18:09:42 fvdl Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)icu.h 5.6 (Berkeley) 5/9/91
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*/
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#ifndef _I386_I8259_H_
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#define _I386_I8259_H_
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#include <dev/isa/isareg.h>
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#ifndef _LOCORE
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/*
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* Interrupt "level" mechanism variables, masks, and macros
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*/
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extern unsigned i8259_imen; /* interrupt mask enable */
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extern unsigned i8259_setmask(unsigned);
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#define SET_ICUS() (outb(IO_ICU1 + 1, imen), outb(IO_ICU2 + 1, imen >> 8))
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extern void i8259_default_setup(void);
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extern void i8259_reinit(void);
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#endif /* !_LOCORE */
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/*
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* Interrupt enable bits -- in order of priority
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*/
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#define IRQ_SLAVE 2
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/*
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* Interrupt Control offset into Interrupt descriptor table (IDT)
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*/
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#define ICU_OFFSET 32 /* 0-31 are processor exceptions */
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#define ICU_LEN 16 /* 32-47 are ISA interrupts */
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#define ICU_HARDWARE_MASK
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/*
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* These macros are fairly self explanatory. If ICU_SPECIAL_MASK_MODE is
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* defined, we try to take advantage of the ICU's `special mask mode' by only
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* EOIing the interrupts on return. This avoids the requirement of masking and
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* unmasking. We can't do this without special mask mode, because the ICU
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* would also hold interrupts that it thinks are of lower priority.
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*
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* Many machines do not support special mask mode, so by default we don't try
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* to use it.
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*/
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#define IRQ_BIT(num) (1 << ((num) % 8))
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#define IRQ_BYTE(num) ((num) >> 3)
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#define i8259_late_ack(num)
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#ifdef ICU_SPECIAL_MASK_MODE
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#define i8259_asm_ack1(num)
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#define i8259_asm_ack2(num) \
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movb $(0x60|IRQ_SLAVE),%al /* specific EOI for IRQ2 */ ;\
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outb %al,$IO_ICU1
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#define i8259_asm_mask(num)
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#define i8259_asm_unmask(num) \
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movb $(0x60|(num%8)),%al /* specific EOI */ ;\
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outb %al,$ICUADDR
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#else /* ICU_SPECIAL_MASK_MODE */
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#ifndef AUTO_EOI_1
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#define i8259_asm_ack1(num) \
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movb $(0x60|(num%8)),%al /* specific EOI */ ;\
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outb %al,$IO_ICU1
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#else
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#define i8259_asm_ack1(num)
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#endif
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#ifndef AUTO_EOI_2
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#define i8259_asm_ack2(num) \
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movb $(0x60|(num%8)),%al /* specific EOI */ ;\
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outb %al,$IO_ICU2 /* do the second ICU first */ ;\
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movb $(0x60|IRQ_SLAVE),%al /* specific EOI for IRQ2 */ ;\
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outb %al,$IO_ICU1
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#else
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#define i8259_asm_ack2(num)
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#endif
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#ifdef PIC_MASKDELAY
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#define MASKDELAY pushl %eax ; inb $0x84,%al ; popl %eax
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#else
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#define MASKDELAY
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#endif
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#ifdef ICU_HARDWARE_MASK
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#define i8259_asm_mask(num) \
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movb _C_LABEL(i8259_imen) + IRQ_BYTE(num),%al ;\
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orb $IRQ_BIT(num),%al ;\
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movb %al,_C_LABEL(i8259_imen) + IRQ_BYTE(num) ;\
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MASKDELAY ;\
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outb %al,$(ICUADDR+1)
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#define i8259_asm_unmask(num) \
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cli ;\
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movb _C_LABEL(i8259_imen) + IRQ_BYTE(num),%al ;\
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andb $~IRQ_BIT(num),%al ;\
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movb %al,_C_LABEL(i8259_imen) + IRQ_BYTE(num) ;\
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MASKDELAY ;\
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outb %al,$(ICUADDR+1) ;\
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sti
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#else /* ICU_HARDWARE_MASK */
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#define i8259_asm_mask(num)
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#define i8259_asm_unmask(num)
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#endif /* ICU_HARDWARE_MASK */
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#endif /* ICU_SPECIAL_MASK_MODE */
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#endif /* !_I386_I8259_H_ */
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#include <x86/i8259.h>
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