/* $OpenBSD: i8259.h,v 1.2 2004/06/13 21:49:16 niklas 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 #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 #ifndef DUMMY_NOPS #define PIC_MASKDELAY #endif #ifdef PIC_MASKDELAY #define MASKDELAY pushl %eax ; inb $0x84,%al ; popl %eax #else #define MASKDELAY #endif #ifdef ICU_HARDWARE_MASK #define i8259_asm_mask(num) \ movb CVAROFF(imen, IRQ_BYTE(num)),%al ;\ orb $IRQ_BIT(num),%al ;\ movb %al,CVAROFF(imen, IRQ_BYTE(num)) ;\ MASKDELAY ;\ outb %al,$(ICUADDR+1) #define i8259_asm_unmask(num) \ cli ;\ movb CVAROFF(imen, IRQ_BYTE(num)),%al ;\ andb $~IRQ_BIT(num),%al ;\ movb %al,CVAROFF(imen, IRQ_BYTE(num)) ;\ MASKDELAY ;\ outb %al,$(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_ */