1 /* $NetBSD: i8259.h,v 1.1 2002/11/22 15:23:47 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 _I386_I8259_H_ 42 #define _I386_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 _C_LABEL(i8259_imen) + IRQ_BYTE(num),%al ;\ 132 orb $IRQ_BIT(num),%al ;\ 133 movb %al,_C_LABEL(i8259_imen) + IRQ_BYTE(num) ;\ 134 MASKDELAY ;\ 135 outb %al,$(ICUADDR+1) 136 #define i8259_asm_unmask(num) \ 137 cli ;\ 138 movb _C_LABEL(i8259_imen) + IRQ_BYTE(num),%al ;\ 139 andb $~IRQ_BIT(num),%al ;\ 140 movb %al,_C_LABEL(i8259_imen) + IRQ_BYTE(num) ;\ 141 MASKDELAY ;\ 142 outb %al,$(ICUADDR+1) ;\ 143 sti 144 145 #else /* ICU_HARDWARE_MASK */ 146 147 #define i8259_asm_mask(num) 148 #define i8259_asm_unmask(num) 149 150 #endif /* ICU_HARDWARE_MASK */ 151 #endif /* ICU_SPECIAL_MASK_MODE */ 152 153 #endif /* !_I386_I8259_H_ */ 154