i8259.h revision 1.1.2.2
1 1.1.2.2 thorpej /* $NetBSD: i8259.h,v 1.1.2.2 2002/12/11 06:01:00 thorpej Exp $ */ 2 1.1.2.2 thorpej 3 1.1.2.2 thorpej /*- 4 1.1.2.2 thorpej * Copyright (c) 1990 The Regents of the University of California. 5 1.1.2.2 thorpej * All rights reserved. 6 1.1.2.2 thorpej * 7 1.1.2.2 thorpej * This code is derived from software contributed to Berkeley by 8 1.1.2.2 thorpej * William Jolitz. 9 1.1.2.2 thorpej * 10 1.1.2.2 thorpej * Redistribution and use in source and binary forms, with or without 11 1.1.2.2 thorpej * modification, are permitted provided that the following conditions 12 1.1.2.2 thorpej * are met: 13 1.1.2.2 thorpej * 1. Redistributions of source code must retain the above copyright 14 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer. 15 1.1.2.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer in the 17 1.1.2.2 thorpej * documentation and/or other materials provided with the distribution. 18 1.1.2.2 thorpej * 3. All advertising materials mentioning features or use of this software 19 1.1.2.2 thorpej * must display the following acknowledgement: 20 1.1.2.2 thorpej * This product includes software developed by the University of 21 1.1.2.2 thorpej * California, Berkeley and its contributors. 22 1.1.2.2 thorpej * 4. Neither the name of the University nor the names of its contributors 23 1.1.2.2 thorpej * may be used to endorse or promote products derived from this software 24 1.1.2.2 thorpej * without specific prior written permission. 25 1.1.2.2 thorpej * 26 1.1.2.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 1.1.2.2 thorpej * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 1.1.2.2 thorpej * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 1.1.2.2 thorpej * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 1.1.2.2 thorpej * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 1.1.2.2 thorpej * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 1.1.2.2 thorpej * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 1.1.2.2 thorpej * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 1.1.2.2 thorpej * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 1.1.2.2 thorpej * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 1.1.2.2 thorpej * SUCH DAMAGE. 37 1.1.2.2 thorpej * 38 1.1.2.2 thorpej * @(#)icu.h 5.6 (Berkeley) 5/9/91 39 1.1.2.2 thorpej */ 40 1.1.2.2 thorpej 41 1.1.2.2 thorpej #ifndef _I386_I8259_H_ 42 1.1.2.2 thorpej #define _I386_I8259_H_ 43 1.1.2.2 thorpej 44 1.1.2.2 thorpej #include <dev/isa/isareg.h> 45 1.1.2.2 thorpej 46 1.1.2.2 thorpej #ifndef _LOCORE 47 1.1.2.2 thorpej 48 1.1.2.2 thorpej /* 49 1.1.2.2 thorpej * Interrupt "level" mechanism variables, masks, and macros 50 1.1.2.2 thorpej */ 51 1.1.2.2 thorpej extern unsigned i8259_imen; /* interrupt mask enable */ 52 1.1.2.2 thorpej extern unsigned i8259_setmask(unsigned); 53 1.1.2.2 thorpej 54 1.1.2.2 thorpej #define SET_ICUS() (outb(IO_ICU1 + 1, imen), outb(IO_ICU2 + 1, imen >> 8)) 55 1.1.2.2 thorpej 56 1.1.2.2 thorpej extern void i8259_default_setup(void); 57 1.1.2.2 thorpej extern void i8259_reinit(void); 58 1.1.2.2 thorpej 59 1.1.2.2 thorpej #endif /* !_LOCORE */ 60 1.1.2.2 thorpej 61 1.1.2.2 thorpej /* 62 1.1.2.2 thorpej * Interrupt enable bits -- in order of priority 63 1.1.2.2 thorpej */ 64 1.1.2.2 thorpej #define IRQ_SLAVE 2 65 1.1.2.2 thorpej 66 1.1.2.2 thorpej /* 67 1.1.2.2 thorpej * Interrupt Control offset into Interrupt descriptor table (IDT) 68 1.1.2.2 thorpej */ 69 1.1.2.2 thorpej #define ICU_OFFSET 32 /* 0-31 are processor exceptions */ 70 1.1.2.2 thorpej #define ICU_LEN 16 /* 32-47 are ISA interrupts */ 71 1.1.2.2 thorpej 72 1.1.2.2 thorpej 73 1.1.2.2 thorpej #define ICU_HARDWARE_MASK 74 1.1.2.2 thorpej 75 1.1.2.2 thorpej /* 76 1.1.2.2 thorpej * These macros are fairly self explanatory. If ICU_SPECIAL_MASK_MODE is 77 1.1.2.2 thorpej * defined, we try to take advantage of the ICU's `special mask mode' by only 78 1.1.2.2 thorpej * EOIing the interrupts on return. This avoids the requirement of masking and 79 1.1.2.2 thorpej * unmasking. We can't do this without special mask mode, because the ICU 80 1.1.2.2 thorpej * would also hold interrupts that it thinks are of lower priority. 81 1.1.2.2 thorpej * 82 1.1.2.2 thorpej * Many machines do not support special mask mode, so by default we don't try 83 1.1.2.2 thorpej * to use it. 84 1.1.2.2 thorpej */ 85 1.1.2.2 thorpej 86 1.1.2.2 thorpej #define IRQ_BIT(num) (1 << ((num) % 8)) 87 1.1.2.2 thorpej #define IRQ_BYTE(num) ((num) >> 3) 88 1.1.2.2 thorpej 89 1.1.2.2 thorpej #define i8259_late_ack(num) 90 1.1.2.2 thorpej 91 1.1.2.2 thorpej #ifdef ICU_SPECIAL_MASK_MODE 92 1.1.2.2 thorpej 93 1.1.2.2 thorpej #define i8259_asm_ack1(num) 94 1.1.2.2 thorpej #define i8259_asm_ack2(num) \ 95 1.1.2.2 thorpej movb $(0x60|IRQ_SLAVE),%al /* specific EOI for IRQ2 */ ;\ 96 1.1.2.2 thorpej outb %al,$IO_ICU1 97 1.1.2.2 thorpej #define i8259_asm_mask(num) 98 1.1.2.2 thorpej #define i8259_asm_unmask(num) \ 99 1.1.2.2 thorpej movb $(0x60|(num%8)),%al /* specific EOI */ ;\ 100 1.1.2.2 thorpej outb %al,$ICUADDR 101 1.1.2.2 thorpej 102 1.1.2.2 thorpej #else /* ICU_SPECIAL_MASK_MODE */ 103 1.1.2.2 thorpej 104 1.1.2.2 thorpej #ifndef AUTO_EOI_1 105 1.1.2.2 thorpej #define i8259_asm_ack1(num) \ 106 1.1.2.2 thorpej movb $(0x60|(num%8)),%al /* specific EOI */ ;\ 107 1.1.2.2 thorpej outb %al,$IO_ICU1 108 1.1.2.2 thorpej #else 109 1.1.2.2 thorpej #define i8259_asm_ack1(num) 110 1.1.2.2 thorpej #endif 111 1.1.2.2 thorpej 112 1.1.2.2 thorpej #ifndef AUTO_EOI_2 113 1.1.2.2 thorpej #define i8259_asm_ack2(num) \ 114 1.1.2.2 thorpej movb $(0x60|(num%8)),%al /* specific EOI */ ;\ 115 1.1.2.2 thorpej outb %al,$IO_ICU2 /* do the second ICU first */ ;\ 116 1.1.2.2 thorpej movb $(0x60|IRQ_SLAVE),%al /* specific EOI for IRQ2 */ ;\ 117 1.1.2.2 thorpej outb %al,$IO_ICU1 118 1.1.2.2 thorpej #else 119 1.1.2.2 thorpej #define i8259_asm_ack2(num) 120 1.1.2.2 thorpej #endif 121 1.1.2.2 thorpej 122 1.1.2.2 thorpej #ifdef PIC_MASKDELAY 123 1.1.2.2 thorpej #define MASKDELAY pushl %eax ; inb $0x84,%al ; popl %eax 124 1.1.2.2 thorpej #else 125 1.1.2.2 thorpej #define MASKDELAY 126 1.1.2.2 thorpej #endif 127 1.1.2.2 thorpej 128 1.1.2.2 thorpej #ifdef ICU_HARDWARE_MASK 129 1.1.2.2 thorpej 130 1.1.2.2 thorpej #define i8259_asm_mask(num) \ 131 1.1.2.2 thorpej movb _C_LABEL(i8259_imen) + IRQ_BYTE(num),%al ;\ 132 1.1.2.2 thorpej orb $IRQ_BIT(num),%al ;\ 133 1.1.2.2 thorpej movb %al,_C_LABEL(i8259_imen) + IRQ_BYTE(num) ;\ 134 1.1.2.2 thorpej MASKDELAY ;\ 135 1.1.2.2 thorpej outb %al,$(ICUADDR+1) 136 1.1.2.2 thorpej #define i8259_asm_unmask(num) \ 137 1.1.2.2 thorpej cli ;\ 138 1.1.2.2 thorpej movb _C_LABEL(i8259_imen) + IRQ_BYTE(num),%al ;\ 139 1.1.2.2 thorpej andb $~IRQ_BIT(num),%al ;\ 140 1.1.2.2 thorpej movb %al,_C_LABEL(i8259_imen) + IRQ_BYTE(num) ;\ 141 1.1.2.2 thorpej MASKDELAY ;\ 142 1.1.2.2 thorpej outb %al,$(ICUADDR+1) ;\ 143 1.1.2.2 thorpej sti 144 1.1.2.2 thorpej 145 1.1.2.2 thorpej #else /* ICU_HARDWARE_MASK */ 146 1.1.2.2 thorpej 147 1.1.2.2 thorpej #define i8259_asm_mask(num) 148 1.1.2.2 thorpej #define i8259_asm_unmask(num) 149 1.1.2.2 thorpej 150 1.1.2.2 thorpej #endif /* ICU_HARDWARE_MASK */ 151 1.1.2.2 thorpej #endif /* ICU_SPECIAL_MASK_MODE */ 152 1.1.2.2 thorpej 153 1.1.2.2 thorpej #endif /* !_I386_I8259_H_ */ 154
Indexes created Sat Nov 01 05:10:12 GMT 2025